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Diffstat (limited to 'libjava/gnu/java/beans/IntrospectionIncubator.java')
-rw-r--r-- | libjava/gnu/java/beans/IntrospectionIncubator.java | 344 |
1 files changed, 344 insertions, 0 deletions
diff --git a/libjava/gnu/java/beans/IntrospectionIncubator.java b/libjava/gnu/java/beans/IntrospectionIncubator.java new file mode 100644 index 00000000000..e3f4807bfbf --- /dev/null +++ b/libjava/gnu/java/beans/IntrospectionIncubator.java @@ -0,0 +1,344 @@ +/* gnu.java.beans.IntrospectionIncubator + Copyright (C) 1998 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., 59 Temple Place, Suite 330, Boston, MA +02111-1307 USA. + +As a special exception, if you link this library with other files to +produce an executable, this library does not by itself cause the +resulting executable to be covered by the GNU General Public License. +This exception does not however invalidate any other reasons why the +executable file might be covered by the GNU General Public License. */ + + +package gnu.java.beans; + +import java.beans.*; +import java.util.*; +import java.lang.reflect.*; +import gnu.java.lang.*; + +/** + ** IntrospectionIncubator takes in a bunch of Methods, and + ** Introspects only those Methods you give it. + ** + ** @author John Keiser + ** @version 1.1.0, 30 Jul 1998 + ** @see gnu.java.beans.ExplicitBeanInfo + ** @see java.beans.BeanInfo + **/ + +public class IntrospectionIncubator { + Hashtable propertyMethods = new Hashtable(); + Hashtable listenerMethods = new Hashtable(); + Vector otherMethods = new Vector(); + + Class propertyStopClass; + Class eventStopClass; + Class methodStopClass; + + public IntrospectionIncubator() { + } + + /* Paving the way for automatic Introspection */ + public void addMethod(Method method) { + if(Modifier.isPublic(method.getModifiers()) && !Modifier.isStatic(method.getModifiers())) { + String name = ClassHelper.getTruncatedName(method.getName()); + Class retType = method.getReturnType(); + Class[] params = method.getParameterTypes(); + boolean isVoid = retType.equals(java.lang.Void.TYPE); + Class methodClass = method.getDeclaringClass(); + if(propertyStopClass == null || (propertyStopClass.isAssignableFrom(methodClass) && !propertyStopClass.equals(methodClass))) { + if(name.startsWith("is") + && retType.equals(java.lang.Boolean.TYPE) + && params.length == 0) { + addToPropertyHash(name,method,IS); + } else if(name.startsWith("get") && !isVoid) { + if(params.length == 0) { + addToPropertyHash(name,method,GET); + } else if(params.length == 1 && params[0].equals(java.lang.Integer.TYPE)) { + addToPropertyHash(name,method,GET_I); + } else { + otherMethods.addElement(method); + } + } else if(name.startsWith("set") && isVoid) { + if(params.length == 1) { + addToPropertyHash(name,method,SET); + } else if(params.length == 2 && params[0].equals(java.lang.Integer.TYPE)) { + addToPropertyHash(name,method,SET_I); + } else { + otherMethods.addElement(method); + } + } + } + if(eventStopClass == null || (eventStopClass.isAssignableFrom(methodClass) && !eventStopClass.equals(methodClass))) { + if(name.startsWith("add") + && isVoid + && params.length == 1 + && java.util.EventListener.class.isAssignableFrom(params[0])) { + addToListenerHash(name,method,ADD); + } else if(name.startsWith("remove") + && isVoid + && params.length == 1 + && java.util.EventListener.class.isAssignableFrom(params[0])) { + addToListenerHash(name,method,REMOVE); + } + } + if(methodStopClass == null || (methodStopClass.isAssignableFrom(methodClass) && !methodStopClass.equals(methodClass))) { + otherMethods.addElement(method); + } + } + } + + public void addMethods(Method[] m) { + for(int i=0;i<m.length;i++) { + addMethod(m[i]); + } + } + + public void setPropertyStopClass(Class c) { + propertyStopClass = c; + } + + public void setEventStopClass(Class c) { + eventStopClass = c; + } + + public void setMethodStopClass(Class c) { + methodStopClass = c; + } + + + public BeanInfoEmbryo getBeanInfoEmbryo() throws IntrospectionException { + BeanInfoEmbryo b = new BeanInfoEmbryo(); + findXXX(b,IS); + findXXXInt(b,GET_I); + findXXXInt(b,SET_I); + findXXX(b,GET); + findXXX(b,SET); + findAddRemovePairs(b); + for(int i=0;i<otherMethods.size();i++) { + MethodDescriptor newMethod = new MethodDescriptor((Method)otherMethods.elementAt(i)); + if(!b.hasMethod(newMethod)) { + b.addMethod(new MethodDescriptor((Method)otherMethods.elementAt(i))); + } + } + return b; + } + + public BeanInfo getBeanInfo() throws IntrospectionException { + return getBeanInfoEmbryo().getBeanInfo(); + } + + + void findAddRemovePairs(BeanInfoEmbryo b) throws IntrospectionException { + Enumeration listenerEnum = listenerMethods.keys(); + while(listenerEnum.hasMoreElements()) { + DoubleKey k = (DoubleKey)listenerEnum.nextElement(); + Method[] m = (Method[])listenerMethods.get(k); + if(m[ADD] != null && m[REMOVE] != null) { + EventSetDescriptor e = new EventSetDescriptor(Introspector.decapitalize(k.getName()), + k.getType(), k.getType().getMethods(), + m[ADD],m[REMOVE]); + e.setUnicast(ArrayHelper.contains(m[ADD].getExceptionTypes(),java.util.TooManyListenersException.class)); + if(!b.hasEvent(e)) { + b.addEvent(e); + } + } + } + } + + void findXXX(BeanInfoEmbryo b, int funcType) throws IntrospectionException { + Enumeration keys = propertyMethods.keys(); + while(keys.hasMoreElements()) { + DoubleKey k = (DoubleKey)keys.nextElement(); + Method[] m = (Method[])propertyMethods.get(k); + if(m[funcType] != null) { + PropertyDescriptor p = new PropertyDescriptor(Introspector.decapitalize(k.getName()), + m[IS] != null ? m[IS] : m[GET], + m[SET]); + if(m[SET] != null) { + p.setConstrained(ArrayHelper.contains(m[SET].getExceptionTypes(),java.beans.PropertyVetoException.class)); + } + if(!b.hasProperty(p)) { + b.addProperty(p); + } + } + } + } + + void findXXXInt(BeanInfoEmbryo b, int funcType) throws IntrospectionException { + Enumeration keys = propertyMethods.keys(); + while(keys.hasMoreElements()) { + DoubleKey k = (DoubleKey)keys.nextElement(); + Method[] m = (Method[])propertyMethods.get(k); + if(m[funcType] != null) { + boolean constrained; + if(m[SET_I] != null) { + constrained = ArrayHelper.contains(m[SET_I].getExceptionTypes(),java.beans.PropertyVetoException.class); + } else { + constrained = false; + } + + /** Find out if there is an array type get or set **/ + Class arrayType = Array.newInstance(k.getType(),0).getClass(); + DoubleKey findSetArray = new DoubleKey(arrayType,k.getName()); + Method[] m2 = (Method[])propertyMethods.get(findSetArray); + IndexedPropertyDescriptor p; + if(m2 == null) { + p = new IndexedPropertyDescriptor(Introspector.decapitalize(k.getName()), + null,null, + m[GET_I],m[SET_I]); + } else { + if(constrained && m2[SET] != null) { + constrained = ArrayHelper.contains(m2[SET].getExceptionTypes(),java.beans.PropertyVetoException.class); + } + p = new IndexedPropertyDescriptor(Introspector.decapitalize(k.getName()), + m2[GET],m2[SET], + m[GET_I],m[SET_I]); + } + p.setConstrained(constrained); + if(!b.hasProperty(p)) { + b.addProperty(p); + } + } + } + } + + static final int IS=0; + static final int GET_I=1; + static final int SET_I=2; + static final int GET=3; + static final int SET=4; + + static final int ADD=0; + static final int REMOVE=1; + + void addToPropertyHash(String name, Method method, int funcType) { + String newName; + Class type; + + switch(funcType) { + case IS: + type = java.lang.Boolean.TYPE; + newName = name.substring(2); + break; + case GET_I: + type = method.getReturnType(); + newName = name.substring(3); + break; + case SET_I: + type = method.getParameterTypes()[1]; + newName = name.substring(3); + break; + case GET: + type = method.getReturnType(); + newName = name.substring(3); + break; + case SET: + type = method.getParameterTypes()[0]; + newName = name.substring(3); + break; + default: + return; + } + newName = capitalize(newName); + + DoubleKey k = new DoubleKey(type,newName); + Method[] methods = (Method[])propertyMethods.get(k); + if(methods == null) { + methods = new Method[5]; + propertyMethods.put(k,methods); + } + methods[funcType] = method; + } + + + void addToListenerHash(String name, Method method, int funcType) { + String newName; + Class type; + + switch(funcType) { + case ADD: + type = method.getParameterTypes()[0]; + newName = name.substring(3,name.length()-8); + break; + case REMOVE: + type = method.getParameterTypes()[0]; + newName = name.substring(6,name.length()-8); + break; + default: + return; + } + newName = capitalize(newName); + + DoubleKey k = new DoubleKey(type,newName); + Method[] methods = (Method[])listenerMethods.get(k); + if(methods == null) { + methods = new Method[2]; + listenerMethods.put(k,methods); + } + methods[funcType] = method; + } + + static String capitalize(String name) { + try { + if(Character.isUpperCase(name.charAt(0))) { + return name; + } else { + char[] c = name.toCharArray(); + c[0] = Character.toLowerCase(c[0]); + return new String(c); + } + } catch(StringIndexOutOfBoundsException E) { + return name; + } catch(NullPointerException E) { + return null; + } + } +} + +class DoubleKey { + Class type; + String name; + + DoubleKey(Class type, String name) { + this.type = type; + this.name = name; + } + + Class getType() { + return type; + } + + String getName() { + return name; + } + + public boolean equals(Object o) { + if(o instanceof DoubleKey) { + DoubleKey d = (DoubleKey)o; + return d.type.equals(type) && d.name.equals(name); + } else { + return false; + } + } + + public int hashCode() { + return type.hashCode() ^ name.hashCode(); + } +} |