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author | tromey <tromey@138bc75d-0d04-0410-961f-82ee72b054a4> | 2005-07-16 00:31:27 +0000 |
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committer | tromey <tromey@138bc75d-0d04-0410-961f-82ee72b054a4> | 2005-07-16 00:31:27 +0000 |
commit | 8082e4be668d586a1ac2c7c05eb710841b6b6202 (patch) | |
tree | ed80c7de91726768a42b235beffbaf622dc2553e /libjava/classpath/vm/reference/java/lang/reflect | |
parent | c8875fb97fc03779a5bba09872227b1d08e5d52a (diff) | |
download | ppe42-gcc-8082e4be668d586a1ac2c7c05eb710841b6b6202.tar.gz ppe42-gcc-8082e4be668d586a1ac2c7c05eb710841b6b6202.zip |
Initial revision
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@102075 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'libjava/classpath/vm/reference/java/lang/reflect')
3 files changed, 1177 insertions, 0 deletions
diff --git a/libjava/classpath/vm/reference/java/lang/reflect/Constructor.java b/libjava/classpath/vm/reference/java/lang/reflect/Constructor.java new file mode 100644 index 00000000000..cddb9ad5e66 --- /dev/null +++ b/libjava/classpath/vm/reference/java/lang/reflect/Constructor.java @@ -0,0 +1,249 @@ +/* java.lang.reflect.Constructor - reflection of Java constructors + Copyright (C) 1998, 2001 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + + +package java.lang.reflect; + +import java.util.Arrays; + +/** + * The Constructor class represents a constructor of a class. It also allows + * dynamic creation of an object, via reflection. Invocation on Constructor + * objects knows how to do widening conversions, but throws + * {@link IllegalArgumentException} if a narrowing conversion would be + * necessary. You can query for information on this Constructor regardless + * of location, but construction access may be limited by Java language + * access controls. If you can't do it in the compiler, you can't normally + * do it here either.<p> + * + * <B>Note:</B> This class returns and accepts types as Classes, even + * primitive types; there are Class types defined that represent each + * different primitive type. They are <code>java.lang.Boolean.TYPE, + * java.lang.Byte.TYPE,</code>, also available as <code>boolean.class, + * byte.class</code>, etc. These are not to be confused with the + * classes <code>java.lang.Boolean, java.lang.Byte</code>, etc., which are + * real classes.<p> + * + * Also note that this is not a serializable class. It is entirely feasible + * to make it serializable using the Externalizable interface, but this is + * on Sun, not me. + * + * @author John Keiser + * @author Eric Blake <ebb9@email.byu.edu> + * @see Member + * @see Class + * @see java.lang.Class#getConstructor(Object[]) + * @see java.lang.Class#getDeclaredConstructor(Object[]) + * @see java.lang.Class#getConstructors() + * @see java.lang.Class#getDeclaredConstructors() + * @since 1.1 + * @status updated to 1.4 + */ +public final class Constructor +extends AccessibleObject implements Member +{ + private Class clazz; + private int slot; + + /** + * This class is uninstantiable except from native code. + */ + private Constructor(Class declaringClass,int slot) + { + this.clazz = declaringClass; + this.slot = slot; + } + + private Constructor() + { + } + + /** + * Gets the class that declared this constructor. + * @return the class that declared this member + */ + public Class getDeclaringClass() + { + return clazz; + } + + /** + * Gets the name of this constructor (the non-qualified name of the class + * it was declared in). + * @return the name of this constructor + */ + public String getName() + { + return getDeclaringClass().getName(); + } + + /** + * Gets the modifiers this constructor uses. Use the <code>Modifier</code> + * class to interpret the values. A constructor can only have a subset of the + * following modifiers: public, private, protected. + * + * @return an integer representing the modifiers to this Member + * @see Modifier + */ + public native int getModifiers(); + + /** + * Get the parameter list for this constructor, in declaration order. If the + * constructor takes no parameters, returns a 0-length array (not null). + * + * @return a list of the types of the constructor's parameters + */ + public native Class[] getParameterTypes(); + + /** + * Get the exception types this constructor says it throws, in no particular + * order. If the constructor has no throws clause, returns a 0-length array + * (not null). + * + * @return a list of the types in the constructor's throws clause + */ + public native Class[] getExceptionTypes(); + + /** + * Compare two objects to see if they are semantically equivalent. + * Two Constructors are semantically equivalent if they have the same + * declaring class and the same parameter list. This ignores different + * exception clauses, but since you can't create a Method except through the + * VM, this is just the == relation. + * + * @param o the object to compare to + * @return <code>true</code> if they are equal; <code>false</code> if not. + */ + public boolean equals(Object o) + { + if (!(o instanceof Constructor)) + return false; + Constructor that = (Constructor)o; + if (this.getDeclaringClass() != that.getDeclaringClass()) + return false; + if (!Arrays.equals(this.getParameterTypes(), that.getParameterTypes())) + return false; + return true; + } + + /** + * Get the hash code for the Constructor. The Constructor hash code is the + * hash code of the declaring class's name. + * + * @return the hash code for the object + */ + public int hashCode() + { + return getDeclaringClass().getName().hashCode(); + } + + /** + * Get a String representation of the Constructor. A Constructor's String + * representation is "<modifier> <classname>(<paramtypes>) + * throws <exceptions>", where everything after ')' is omitted if + * there are no exceptions.<br> Example: + * <code>public java.io.FileInputStream(java.lang.Runnable) + * throws java.io.FileNotFoundException</code> + * + * @return the String representation of the Constructor + */ + public String toString() + { + // 128 is a reasonable buffer initial size for constructor + StringBuffer sb = new StringBuffer(128); + Modifier.toString(getModifiers(), sb).append(' '); + sb.append(getDeclaringClass().getName()).append('('); + Class[] c = getParameterTypes(); + if (c.length > 0) + { + sb.append(c[0].getName()); + for (int i = 1; i < c.length; i++) + sb.append(',').append(c[i].getName()); + } + sb.append(')'); + c = getExceptionTypes(); + if (c.length > 0) + { + sb.append(" throws ").append(c[0].getName()); + for (int i = 1; i < c.length; i++) + sb.append(',').append(c[i].getName()); + } + return sb.toString(); + } + + /** + * Create a new instance by invoking the constructor. Arguments are + * automatically unwrapped and widened, if needed.<p> + * + * If this class is abstract, you will get an + * <code>InstantiationException</code>. If the constructor takes 0 + * arguments, you may use null or a 0-length array for <code>args</code>.<p> + * + * If this Constructor enforces access control, your runtime context is + * evaluated, and you may have an <code>IllegalAccessException</code> if + * you could not create this object in similar compiled code. If the class + * is uninitialized, you trigger class initialization, which may end in a + * <code>ExceptionInInitializerError</code>.<p> + * + * Then, the constructor is invoked. If it completes normally, the return + * value will be the new object. If it completes abruptly, the exception is + * wrapped in an <code>InvocationTargetException</code>. + * + * @param args the arguments to the constructor + * @return the newly created object + * @throws IllegalAccessException if the constructor could not normally be + * called by the Java code (i.e. it is not public) + * @throws IllegalArgumentException if the number of arguments is incorrect; + * or if the arguments types are wrong even with a widening + * conversion + * @throws InstantiationException if the class is abstract + * @throws InvocationTargetException if the constructor throws an exception + * @throws ExceptionInInitializerError if construction triggered class + * initialization, which then failed + */ + public Object newInstance(Object args[]) + throws InstantiationException, IllegalAccessException, + InvocationTargetException + { + return constructNative(args, clazz, slot); + } + + private native Object constructNative(Object[] args, Class declaringClass, + int slot) + throws InstantiationException, IllegalAccessException, + InvocationTargetException; +} diff --git a/libjava/classpath/vm/reference/java/lang/reflect/Field.java b/libjava/classpath/vm/reference/java/lang/reflect/Field.java new file mode 100644 index 00000000000..85e76d63479 --- /dev/null +++ b/libjava/classpath/vm/reference/java/lang/reflect/Field.java @@ -0,0 +1,589 @@ +/* java.lang.reflect.Field - reflection of Java fields + Copyright (C) 1998, 2001 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + + +package java.lang.reflect; + +/** + * The Field class represents a member variable of a class. It also allows + * dynamic access to a member, via reflection. This works for both + * static and instance fields. Operations on Field objects know how to + * do widening conversions, but throw {@link IllegalArgumentException} if + * a narrowing conversion would be necessary. You can query for information + * on this Field regardless of location, but get and set access may be limited + * by Java language access controls. If you can't do it in the compiler, you + * can't normally do it here either.<p> + * + * <B>Note:</B> This class returns and accepts types as Classes, even + * primitive types; there are Class types defined that represent each + * different primitive type. They are <code>java.lang.Boolean.TYPE, + * java.lang.Byte.TYPE,</code>, also available as <code>boolean.class, + * byte.class</code>, etc. These are not to be confused with the + * classes <code>java.lang.Boolean, java.lang.Byte</code>, etc., which are + * real classes.<p> + * + * Also note that this is not a serializable class. It is entirely feasible + * to make it serializable using the Externalizable interface, but this is + * on Sun, not me. + * + * @author John Keiser + * @author Eric Blake <ebb9@email.byu.edu> + * @see Member + * @see Class + * @see Class#getField(String) + * @see Class#getDeclaredField(String) + * @see Class#getFields() + * @see Class#getDeclaredFields() + * @since 1.1 + * @status updated to 1.4 + */ +public final class Field +extends AccessibleObject implements Member +{ + private Class declaringClass; + private String name; + private int slot; + + /** + * This class is uninstantiable except natively. + */ + private Field(Class declaringClass, String name, int slot) + { + this.declaringClass = declaringClass; + this.name = name; + this.slot = slot; + } + + /** + * Gets the class that declared this field, or the class where this field + * is a non-inherited member. + * @return the class that declared this member + */ + public Class getDeclaringClass() + { + return declaringClass; + } + + /** + * Gets the name of this field. + * @return the name of this field + */ + public String getName() + { + return name; + } + + /** + * Gets the modifiers this field uses. Use the <code>Modifier</code> + * class to interpret the values. A field can only have a subset of the + * following modifiers: public, private, protected, static, final, + * transient, and volatile. + * + * @return an integer representing the modifiers to this Member + * @see Modifier + */ + public native int getModifiers(); + + /** + * Gets the type of this field. + * @return the type of this field + */ + public native Class getType(); + + /** + * Compare two objects to see if they are semantically equivalent. + * Two Fields are semantically equivalent if they have the same declaring + * class, name, and type. Since you can't creat a Field except through + * the VM, this is just the == relation. + * + * @param o the object to compare to + * @return <code>true</code> if they are equal; <code>false</code> if not + */ + public boolean equals(Object o) + { + if (!(o instanceof Field)) + return false; + Field that = (Field)o; + if (this.getDeclaringClass() != that.getDeclaringClass()) + return false; + if (!this.getName().equals(that.getName())) + return false; + if (this.getType() != that.getType()) + return false; + return true; + } + + /** + * Get the hash code for the Field. The Field hash code is the hash code + * of its name XOR'd with the hash code of its class name. + * + * @return the hash code for the object. + */ + public int hashCode() + { + return getDeclaringClass().getName().hashCode() ^ getName().hashCode(); + } + + /** + * Get a String representation of the Field. A Field's String + * representation is "<modifiers> <type> + * <class>.<fieldname>".<br> Example: + * <code>public transient boolean gnu.parse.Parser.parseComplete</code> + * + * @return the String representation of the Field + */ + public String toString() + { + // 64 is a reasonable buffer initial size for field + StringBuffer sb = new StringBuffer(64); + Modifier.toString(getModifiers(), sb).append(' '); + sb.append(getType().getName()).append(' '); + sb.append(getDeclaringClass().getName()).append('.'); + sb.append(getName()); + return sb.toString(); + } + + /** + * Get the value of this Field. If it is primitive, it will be wrapped + * in the appropriate wrapper type (boolean = java.lang.Boolean).<p> + * + * If the field is static, <code>o</code> will be ignored. Otherwise, if + * <code>o</code> is null, you get a <code>NullPointerException</code>, + * and if it is incompatible with the declaring class of the field, you + * get an <code>IllegalArgumentException</code>.<p> + * + * Next, if this Field enforces access control, your runtime context is + * evaluated, and you may have an <code>IllegalAccessException</code> if + * you could not access this field in similar compiled code. If the field + * is static, and its class is uninitialized, you trigger class + * initialization, which may end in a + * <code>ExceptionInInitializerError</code>.<p> + * + * Finally, the field is accessed, and primitives are wrapped (but not + * necessarily in new objects). This method accesses the field of the + * declaring class, even if the instance passed in belongs to a subclass + * which declares another field to hide this one. + * + * @param o the object to get the value of this Field from + * @return the value of the Field + * @throws IllegalAccessException if you could not normally access this field + * (i.e. it is not public) + * @throws IllegalArgumentException if <code>o</code> is not an instance of + * the class or interface declaring this field + * @throws NullPointerException if <code>o</code> is null and this field + * requires an instance + * @throws ExceptionInInitializerError if accessing a static field triggered + * class initialization, which then failed + * @see #getBoolean(Object) + * @see #getByte(Object) + * @see #getChar(Object) + * @see #getShort(Object) + * @see #getInt(Object) + * @see #getLong(Object) + * @see #getFloat(Object) + * @see #getDouble(Object) + */ + public native Object get(Object o) + throws IllegalAccessException; + + /** + * Get the value of this boolean Field. If the field is static, + * <code>o</code> will be ignored. + * + * @param o the object to get the value of this Field from + * @return the value of the Field + * @throws IllegalAccessException if you could not normally access this field + * (i.e. it is not public) + * @throws IllegalArgumentException if this is not a boolean field of + * <code>o</code>, or if <code>o</code> is not an instance of the + * declaring class of this field + * @throws NullPointerException if <code>o</code> is null and this field + * requires an instance + * @throws ExceptionInInitializerError if accessing a static field triggered + * class initialization, which then failed + * @see #get(Object) + */ + public native boolean getBoolean(Object o) + throws IllegalAccessException; + + /** + * Get the value of this byte Field. If the field is static, + * <code>o</code> will be ignored. + * + * @param o the object to get the value of this Field from + * @return the value of the Field + * @throws IllegalAccessException if you could not normally access this field + * (i.e. it is not public) + * @throws IllegalArgumentException if this is not a byte field of + * <code>o</code>, or if <code>o</code> is not an instance of the + * declaring class of this field + * @throws NullPointerException if <code>o</code> is null and this field + * requires an instance + * @throws ExceptionInInitializerError if accessing a static field triggered + * class initialization, which then failed + * @see #get(Object) + */ + public native byte getByte(Object o) + throws IllegalAccessException; + + /** + * Get the value of this Field as a char. If the field is static, + * <code>o</code> will be ignored. + * + * @throws IllegalAccessException if you could not normally access this field + * (i.e. it is not public) + * @throws IllegalArgumentException if this is not a char field of + * <code>o</code>, or if <code>o</code> is not an instance + * of the declaring class of this field + * @throws NullPointerException if <code>o</code> is null and this field + * requires an instance + * @throws ExceptionInInitializerError if accessing a static field triggered + * class initialization, which then failed + * @see #get(Object) + */ + public native char getChar(Object o) + throws IllegalAccessException; + + /** + * Get the value of this Field as a short. If the field is static, + * <code>o</code> will be ignored. + * + * @param o the object to get the value of this Field from + * @return the value of the Field + * @throws IllegalAccessException if you could not normally access this field + * (i.e. it is not public) + * @throws IllegalArgumentException if this is not a byte or short + * field of <code>o</code>, or if <code>o</code> is not an instance + * of the declaring class of this field + * @throws NullPointerException if <code>o</code> is null and this field + * requires an instance + * @throws ExceptionInInitializerError if accessing a static field triggered + * class initialization, which then failed + * @see #get(Object) + */ + public native short getShort(Object o) + throws IllegalAccessException; + + /** + * Get the value of this Field as an int. If the field is static, + * <code>o</code> will be ignored. + * + * @param o the object to get the value of this Field from + * @return the value of the Field + * @throws IllegalAccessException if you could not normally access this field + * (i.e. it is not public) + * @throws IllegalArgumentException if this is not a byte, short, char, or + * int field of <code>o</code>, or if <code>o</code> is not an + * instance of the declaring class of this field + * @throws NullPointerException if <code>o</code> is null and this field + * requires an instance + * @throws ExceptionInInitializerError if accessing a static field triggered + * class initialization, which then failed + * @see #get(Object) + */ + public native int getInt(Object o) + throws IllegalAccessException; + + /** + * Get the value of this Field as a long. If the field is static, + * <code>o</code> will be ignored. + * + * @param o the object to get the value of this Field from + * @return the value of the Field + * @throws IllegalAccessException if you could not normally access this field + * (i.e. it is not public) + * @throws IllegalArgumentException if this is not a byte, short, char, int, + * or long field of <code>o</code>, or if <code>o</code> is not an + * instance of the declaring class of this field + * @throws NullPointerException if <code>o</code> is null and this field + * requires an instance + * @throws ExceptionInInitializerError if accessing a static field triggered + * class initialization, which then failed + * @see #get(Object) + */ + public native long getLong(Object o) + throws IllegalAccessException; + + /** + * Get the value of this Field as a float. If the field is static, + * <code>o</code> will be ignored. + * + * @param o the object to get the value of this Field from + * @return the value of the Field + * @throws IllegalAccessException if you could not normally access this field + * (i.e. it is not public) + * @throws IllegalArgumentException if this is not a byte, short, char, int, + * long, or float field of <code>o</code>, or if <code>o</code> is + * not an instance of the declaring class of this field + * @throws NullPointerException if <code>o</code> is null and this field + * requires an instance + * @throws ExceptionInInitializerError if accessing a static field triggered + * class initialization, which then failed + * @see #get(Object) + */ + public native float getFloat(Object o) + throws IllegalAccessException; + + /** + * Get the value of this Field as a double. If the field is static, + * <code>o</code> will be ignored. + * + * @param o the object to get the value of this Field from + * @return the value of the Field + * @throws IllegalAccessException if you could not normally access this field + * (i.e. it is not public) + * @throws IllegalArgumentException if this is not a byte, short, char, int, + * long, float, or double field of <code>o</code>, or if + * <code>o</code> is not an instance of the declaring class of this + * field + * @throws NullPointerException if <code>o</code> is null and this field + * requires an instance + * @throws ExceptionInInitializerError if accessing a static field triggered + * class initialization, which then failed + * @see #get(Object) + */ + public native double getDouble(Object o) + throws IllegalAccessException; + + /** + * Set the value of this Field. If it is a primitive field, the value + * will be unwrapped from the passed object (boolean = java.lang.Boolean).<p> + * + * If the field is static, <code>o</code> will be ignored. Otherwise, if + * <code>o</code> is null, you get a <code>NullPointerException</code>, + * and if it is incompatible with the declaring class of the field, you + * get an <code>IllegalArgumentException</code>.<p> + * + * Next, if this Field enforces access control, your runtime context is + * evaluated, and you may have an <code>IllegalAccessException</code> if + * you could not access this field in similar compiled code. This also + * occurs whether or not there is access control if the field is final. + * If the field is primitive, and unwrapping your argument fails, you will + * get an <code>IllegalArgumentException</code>; likewise, this error + * happens if <code>value</code> cannot be cast to the correct object type. + * If the field is static, and its class is uninitialized, you trigger class + * initialization, which may end in a + * <code>ExceptionInInitializerError</code>.<p> + * + * Finally, the field is set with the widened value. This method accesses + * the field of the declaring class, even if the instance passed in belongs + * to a subclass which declares another field to hide this one. + * + * @param o the object to set this Field on + * @param value the value to set this Field to + * @throws IllegalAccessException if you could not normally access this field + * (i.e. it is not public) + * @throws IllegalArgumentException if <code>value</code> cannot be + * converted by a widening conversion to the underlying type of + * the Field, or if <code>o</code> is not an instance of the class + * declaring this field + * @throws NullPointerException if <code>o</code> is null and this field + * requires an instance + * @throws ExceptionInInitializerError if accessing a static field triggered + * class initialization, which then failed + * @see #setBoolean(Object, boolean) + * @see #setByte(Object, byte) + * @see #setChar(Object, char) + * @see #setShort(Object, short) + * @see #setInt(Object, int) + * @see #setLong(Object, long) + * @see #setFloat(Object, float) + * @see #setDouble(Object, double) + */ + public native void set(Object o, Object value) + throws IllegalAccessException; + + /** + * Set this boolean Field. If the field is static, <code>o</code> will be + * ignored. + * + * @param o the object to set this Field on + * @param value the value to set this Field to + * @throws IllegalAccessException if you could not normally access this field + * (i.e. it is not public) + * @throws IllegalArgumentException if this is not a boolean field, or if + * <code>o</code> is not an instance of the class declaring this + * field + * @throws NullPointerException if <code>o</code> is null and this field + * requires an instance + * @throws ExceptionInInitializerError if accessing a static field triggered + * class initialization, which then failed + * @see #set(Object, Object) + */ + public native void setBoolean(Object o, boolean value) + throws IllegalAccessException; + + /** + * Set this byte Field. If the field is static, <code>o</code> will be + * ignored. + * + * @param o the object to set this Field on + * @param value the value to set this Field to + * @throws IllegalAccessException if you could not normally access this field + * (i.e. it is not public) + * @throws IllegalArgumentException if this is not a byte, short, int, long, + * float, or double field, or if <code>o</code> is not an instance + * of the class declaring this field + * @throws NullPointerException if <code>o</code> is null and this field + * requires an instance + * @throws ExceptionInInitializerError if accessing a static field triggered + * class initialization, which then failed + * @see #set(Object, Object) + */ + public native void setByte(Object o, byte value) + throws IllegalAccessException; + + /** + * Set this char Field. If the field is static, <code>o</code> will be + * ignored. + * + * @param o the object to set this Field on + * @param value the value to set this Field to + * @throws IllegalAccessException if you could not normally access this field + * (i.e. it is not public) + * @throws IllegalArgumentException if this is not a char, int, long, + * float, or double field, or if <code>o</code> is not an instance + * of the class declaring this field + * @throws NullPointerException if <code>o</code> is null and this field + * requires an instance + * @throws ExceptionInInitializerError if accessing a static field triggered + * class initialization, which then failed + * @see #set(Object, Object) + */ + public native void setChar(Object o, char value) + throws IllegalAccessException; + + /** + * Set this short Field. If the field is static, <code>o</code> will be + * ignored. + * + * @param o the object to set this Field on + * @param value the value to set this Field to + * @throws IllegalAccessException if you could not normally access this field + * (i.e. it is not public) + * @throws IllegalArgumentException if this is not a short, int, long, + * float, or double field, or if <code>o</code> is not an instance + * of the class declaring this field + * @throws NullPointerException if <code>o</code> is null and this field + * requires an instance + * @throws ExceptionInInitializerError if accessing a static field triggered + * class initialization, which then failed + * @see #set(Object, Object) + */ + public native void setShort(Object o, short value) + throws IllegalAccessException; + + /** + * Set this int Field. If the field is static, <code>o</code> will be + * ignored. + * + * @param o the object to set this Field on + * @param value the value to set this Field to + * @throws IllegalAccessException if you could not normally access this field + * (i.e. it is not public) + * @throws IllegalArgumentException if this is not an int, long, float, or + * double field, or if <code>o</code> is not an instance of the + * class declaring this field + * @throws NullPointerException if <code>o</code> is null and this field + * requires an instance + * @throws ExceptionInInitializerError if accessing a static field triggered + * class initialization, which then failed + * @see #set(Object, Object) + */ + public native void setInt(Object o, int value) + throws IllegalAccessException; + + /** + * Set this long Field. If the field is static, <code>o</code> will be + * ignored. + * + * @param o the object to set this Field on + * @param value the value to set this Field to + * @throws IllegalAccessException if you could not normally access this field + * (i.e. it is not public) + * @throws IllegalArgumentException if this is not a long, float, or double + * field, or if <code>o</code> is not an instance of the class + * declaring this field + * @throws NullPointerException if <code>o</code> is null and this field + * requires an instance + * @throws ExceptionInInitializerError if accessing a static field triggered + * class initialization, which then failed + * @see #set(Object, Object) + */ + public native void setLong(Object o, long value) + throws IllegalAccessException; + + /** + * Set this float Field. If the field is static, <code>o</code> will be + * ignored. + * + * @param o the object to set this Field on + * @param value the value to set this Field to + * @throws IllegalAccessException if you could not normally access this field + * (i.e. it is not public) + * @throws IllegalArgumentException if this is not a float or long field, or + * if <code>o</code> is not an instance of the class declaring this + * field + * @throws NullPointerException if <code>o</code> is null and this field + * requires an instance + * @throws ExceptionInInitializerError if accessing a static field triggered + * class initialization, which then failed + * @see #set(Object, Object) + */ + public native void setFloat(Object o, float value) + throws IllegalAccessException; + + /** + * Set this double Field. If the field is static, <code>o</code> will be + * ignored. + * + * @param o the object to set this Field on + * @param value the value to set this Field to + * @throws IllegalAccessException if you could not normally access this field + * (i.e. it is not public) + * @throws IllegalArgumentException if this is not a double field, or if + * <code>o</code> is not an instance of the class declaring this + * field + * @throws NullPointerException if <code>o</code> is null and this field + * requires an instance + * @throws ExceptionInInitializerError if accessing a static field triggered + * class initialization, which then failed + * @see #set(Object, Object) + */ + public native void setDouble(Object o, double value) + throws IllegalAccessException; +} diff --git a/libjava/classpath/vm/reference/java/lang/reflect/Method.java b/libjava/classpath/vm/reference/java/lang/reflect/Method.java new file mode 100644 index 00000000000..f289e776337 --- /dev/null +++ b/libjava/classpath/vm/reference/java/lang/reflect/Method.java @@ -0,0 +1,339 @@ +/* java.lang.reflect.Method - reflection of Java methods + Copyright (C) 1998, 2001, 2002 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + + +package java.lang.reflect; + +import java.util.Arrays; + +/** + * The Method class represents a member method of a class. It also allows + * dynamic invocation, via reflection. This works for both static and + * instance methods. Invocation on Method objects knows how to do + * widening conversions, but throws {@link IllegalArgumentException} if + * a narrowing conversion would be necessary. You can query for information + * on this Method regardless of location, but invocation access may be limited + * by Java language access controls. If you can't do it in the compiler, you + * can't normally do it here either.<p> + * + * <B>Note:</B> This class returns and accepts types as Classes, even + * primitive types; there are Class types defined that represent each + * different primitive type. They are <code>java.lang.Boolean.TYPE, + * java.lang.Byte.TYPE,</code>, also available as <code>boolean.class, + * byte.class</code>, etc. These are not to be confused with the + * classes <code>java.lang.Boolean, java.lang.Byte</code>, etc., which are + * real classes.<p> + * + * Also note that this is not a serializable class. It is entirely feasible + * to make it serializable using the Externalizable interface, but this is + * on Sun, not me. + * + * @author John Keiser + * @author Eric Blake <ebb9@email.byu.edu> + * @see Member + * @see Class + * @see java.lang.Class#getMethod(String,Object[]) + * @see java.lang.Class#getDeclaredMethod(String,Object[]) + * @see java.lang.Class#getMethods() + * @see java.lang.Class#getDeclaredMethods() + * @since 1.1 + * @status updated to 1.4 + */ +public final class Method +extends AccessibleObject implements Member +{ + Class declaringClass; + String name; + int slot; + + /** + * This class is uninstantiable. + */ + private Method(Class declaringClass, String name, int slot) + { + this.declaringClass = declaringClass; + this.name = name; + this.slot = slot; + } + + /** + * Gets the class that declared this method, or the class where this method + * is a non-inherited member. + * @return the class that declared this member + */ + public Class getDeclaringClass() + { + return declaringClass; + } + + /** + * Gets the name of this method. + * @return the name of this method + */ + public String getName() + { + return name; + } + + /** + * Gets the modifiers this method uses. Use the <code>Modifier</code> + * class to interpret the values. A method can only have a subset of the + * following modifiers: public, private, protected, abstract, static, + * final, synchronized, native, and strictfp. + * + * @return an integer representing the modifiers to this Member + * @see Modifier + */ + public native int getModifiers(); + + /** + * Gets the return type of this method. + * @return the type of this method + */ + public native Class getReturnType(); + + /** + * Get the parameter list for this method, in declaration order. If the + * method takes no parameters, returns a 0-length array (not null). + * + * @return a list of the types of the method's parameters + */ + public native Class[] getParameterTypes(); + + /** + * Get the exception types this method says it throws, in no particular + * order. If the method has no throws clause, returns a 0-length array + * (not null). + * + * @return a list of the types in the method's throws clause + */ + public native Class[] getExceptionTypes(); + + /** + * Compare two objects to see if they are semantically equivalent. + * Two Methods are semantically equivalent if they have the same declaring + * class, name, parameter list, and return type. + * + * @param o the object to compare to + * @return <code>true</code> if they are equal; <code>false</code> if not + */ + public boolean equals(Object o) + { + // Implementation note: + // The following is a correct but possibly slow implementation. + // + // This class has a private field 'slot' that could be used by + // the VM implementation to "link" a particular method to a Class. + // In that case equals could be simply implemented as: + // + // if (o instanceof Method) + // { + // Method m = (Method)o; + // return m.declaringClass == this.declaringClass + // && m.slot == this.slot; + // } + // return false; + // + // If a VM uses the Method class as their native/internal representation + // then just using the following would be optimal: + // + // return this == o; + // + if (!(o instanceof Method)) + return false; + Method that = (Method)o; + if (this.getDeclaringClass() != that.getDeclaringClass()) + return false; + if (!this.getName().equals(that.getName())) + return false; + if (this.getReturnType() != that.getReturnType()) + return false; + if (!Arrays.equals(this.getParameterTypes(), that.getParameterTypes())) + return false; + return true; + } + + /** + * Get the hash code for the Method. The Method hash code is the hash code + * of its name XOR'd with the hash code of its class name. + * + * @return the hash code for the object + */ + public int hashCode() + { + return getDeclaringClass().getName().hashCode() ^ getName().hashCode(); + } + + /** + * Get a String representation of the Method. A Method's String + * representation is "<modifiers> <returntype> + * <methodname>(<paramtypes>) throws <exceptions>", where + * everything after ')' is omitted if there are no exceptions.<br> Example: + * <code>public static int run(java.lang.Runnable,int)</code> + * + * @return the String representation of the Method + */ + public String toString() + { + // 128 is a reasonable buffer initial size for constructor + StringBuffer sb = new StringBuffer(128); + Modifier.toString(getModifiers(), sb).append(' '); + sb.append(getUserTypeName(getReturnType().getName())).append(' '); + sb.append(getDeclaringClass().getName()).append('.'); + sb.append(getName()).append('('); + Class[] c = getParameterTypes(); + if (c.length > 0) + { + sb.append(getUserTypeName(c[0].getName())); + for (int i = 1; i < c.length; i++) + sb.append(',').append(getUserTypeName(c[i].getName())); + } + sb.append(')'); + c = getExceptionTypes(); + if (c.length > 0) + { + sb.append(" throws ").append(c[0].getName()); + for (int i = 1; i < c.length; i++) + sb.append(',').append(c[i].getName()); + } + return sb.toString(); + } + + private static String getUserTypeName(String typeSpec) + { + int pos = 0; + String typeName = ""; + String arrayPart = ""; + + while (typeSpec.charAt(pos) == '[') + { + arrayPart += "[]"; + ++pos; + } + + switch (typeSpec.charAt(pos)) + { + case 'Z': + typeName = "boolean"; + break; + case 'B': + typeName = "byte"; + break; + case 'C': + typeName = "char"; + break; + case 'D': + typeName = "double"; + break; + case 'F': + typeName = "float"; + break; + case 'I': + typeName = "int"; + break; + case 'J': + typeName = "long"; + break; + case 'S': + typeName = "short"; + break; + case 'L': + typeName = typeSpec.substring(pos + 1, typeSpec.length() - 1); + break; + default: + typeName = typeSpec; + break; + } + + return typeName + arrayPart; + } + + /** + * Invoke the method. Arguments are automatically unwrapped and widened, + * and the result is automatically wrapped, if needed.<p> + * + * If the method is static, <code>o</code> will be ignored. Otherwise, + * the method uses dynamic lookup as described in JLS 15.12.4.4. You cannot + * mimic the behavior of nonvirtual lookup (as in super.foo()). This means + * you will get a <code>NullPointerException</code> if <code>o</code> is + * null, and an <code>IllegalArgumentException</code> if it is incompatible + * with the declaring class of the method. If the method takes 0 arguments, + * you may use null or a 0-length array for <code>args</code>.<p> + * + * Next, if this Method enforces access control, your runtime context is + * evaluated, and you may have an <code>IllegalAccessException</code> if + * you could not acces this method in similar compiled code. If the method + * is static, and its class is uninitialized, you trigger class + * initialization, which may end in a + * <code>ExceptionInInitializerError</code>.<p> + * + * Finally, the method is invoked. If it completes normally, the return value + * will be null for a void method, a wrapped object for a primitive return + * method, or the actual return of an Object method. If it completes + * abruptly, the exception is wrapped in an + * <code>InvocationTargetException</code>. + * + * @param o the object to invoke the method on + * @param args the arguments to the method + * @return the return value of the method, wrapped in the appropriate + * wrapper if it is primitive + * @throws IllegalAccessException if the method could not normally be called + * by the Java code (i.e. it is not public) + * @throws IllegalArgumentException if the number of arguments is incorrect; + * if the arguments types are wrong even with a widening conversion; + * or if <code>o</code> is not an instance of the class or interface + * declaring this method + * @throws InvocationTargetException if the method throws an exception + * @throws NullPointerException if <code>o</code> is null and this field + * requires an instance + * @throws ExceptionInInitializerError if accessing a static method triggered + * class initialization, which then failed + */ + public Object invoke(Object o, Object[] args) + throws IllegalAccessException, InvocationTargetException + { + return invokeNative(o, args, declaringClass, slot); + } + + /* + * NATIVE HELPERS + */ + + private native Object invokeNative(Object o, Object[] args, + Class declaringClass, int slot) + throws IllegalAccessException, InvocationTargetException; +} |