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-/* ObjectCreator.java --
- Copyright (C) 2005 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 gnu.CORBA;
-
-import gnu.CORBA.CDR.UnknownExceptionCtxHandler;
-import gnu.CORBA.CDR.BufferredCdrInput;
-import gnu.CORBA.CDR.BufferedCdrOutput;
-import gnu.CORBA.CDR.AbstractCdrInput;
-import gnu.CORBA.GIOP.ServiceContext;
-import gnu.CORBA.typecodes.RecordTypeCode;
-// GCJ LOCAL - We don't have this yet.
-// import gnu.classpath.VMStackWalker;
-
-import org.omg.CORBA.Any;
-import org.omg.CORBA.CompletionStatus;
-import org.omg.CORBA.CompletionStatusHelper;
-import org.omg.CORBA.MARSHAL;
-import org.omg.CORBA.SystemException;
-import org.omg.CORBA.TCKind;
-import org.omg.CORBA.UNKNOWN;
-import org.omg.CORBA.UserException;
-import org.omg.CORBA.portable.IDLEntity;
-import org.omg.CORBA.portable.InputStream;
-import org.omg.CORBA.portable.OutputStream;
-import org.omg.CORBA.portable.ValueBase;
-
-import java.lang.reflect.Method;
-import java.util.Map;
-import java.util.WeakHashMap;
-
-import javax.rmi.CORBA.Util;
-
-/**
- * Creates java objects from the agreed IDL names for the simple case when the
- * CORBA object is directly mapped into the locally defined java class.
- *
- * @author Audrius Meskauskas (AudriusA@Bioinformatics.org)
- */
-public class ObjectCreator
-{
- /**
- * The standard OMG prefix.
- */
- public static final String OMG_PREFIX = "omg.org/";
-
- /**
- * The standard java prefix.
- */
- public static final String JAVA_PREFIX = "org.omg.";
-
- /**
- * The prefix for classes that are placed instide the gnu.CORBA namespace.
- */
- public static final String CLASSPATH_PREFIX = "gnu.CORBA.";
-
- /**
- * Maps classes to they IDL or RMI names. Computing RMI name is an expensive
- * operations, so frequently used RMI keys are reused. The map must be weak to
- * ensure that the class can be unloaded, when applicable.
- */
- public static Map m_names = new WeakHashMap();
-
- /**
- * Maps IDL strings into known classes. The map must be weak to ensure that
- * the class can be unloaded, when applicable.
- */
- public static Map m_classes = new WeakHashMap();
-
- /**
- * Maps IDL types to they helpers.
- */
- public static Map m_helpers = new WeakHashMap();
-
- /**
- * Try to instantiate an object with the given IDL name. The object must be
- * mapped to the local java class. The omg.org domain must be mapped into the
- * object in either org/omg or gnu/CORBA namespace.
- *
- * @param IDL name
- * @return instantiated object instance or null if no such available.
- */
- public static java.lang.Object createObject(String idl, String suffix)
- {
- synchronized (m_classes)
- {
- Class known = (Class) (suffix == null ? m_classes.get(idl)
- : m_classes.get(idl + 0xff + suffix));
- Object object;
-
- if (known != null)
- {
- try
- {
- return known.newInstance();
- }
- catch (Exception ex)
- {
- RuntimeException rex = new RuntimeException(idl + " suffix "
- + suffix, ex);
- throw rex;
- }
- }
- else
- {
- if (suffix == null)
- suffix = "";
- try
- {
- known = forName(toClassName(JAVA_PREFIX, idl) + suffix);
- object = known.newInstance();
- }
- catch (Exception ex)
- {
- try
- {
- known = forName(toClassName(CLASSPATH_PREFIX, idl)
- + suffix);
- object = known.newInstance();
- }
- catch (Exception exex)
- {
- return null;
- }
- }
- m_classes.put(idl + 0xff + suffix, known);
- return object;
- }
- }
- }
-
- /**
- * Read the system exception from the given stream.
- *
- * @param input the CDR stream to read from.
- * @param contexts the service contexts in request/reply header/
- *
- * @return the exception that has been stored in the stream (IDL name, minor
- * code and completion status).
- */
- public static SystemException readSystemException(InputStream input,
- ServiceContext[] contexts)
- {
- SystemException exception;
-
- String idl = input.read_string();
- int minor = input.read_ulong();
- CompletionStatus completed = CompletionStatusHelper.read(input);
-
- try
- {
- exception = (SystemException) createObject(idl, null);
- exception.minor = minor;
- exception.completed = completed;
- }
- catch (Exception ex)
- {
- UNKNOWN u = new UNKNOWN("Unsupported system exception " + idl, minor,
- completed);
- u.initCause(ex);
- throw u;
- }
-
- try
- {
- // If UnknownExceptionInfo is present in the contexts, read it and
- // set as a cause of this exception.
- ServiceContext uEx = ServiceContext.find(
- ServiceContext.UnknownExceptionInfo, contexts);
-
- if (uEx != null)
- {
- BufferredCdrInput in = new BufferredCdrInput(uEx.context_data);
- in.setOrb(in.orb());
- if (input instanceof AbstractCdrInput)
- {
- ((AbstractCdrInput) input).cloneSettings(in);
- }
-
- Throwable t = UnknownExceptionCtxHandler.read(in, contexts);
- exception.initCause(t);
- }
- }
- catch (Exception ex)
- {
- // Unsupported context format. Do not terminate as the user program may
- // not need it.
- }
-
- return exception;
- }
-
- /**
- * Reads the user exception, having the given Id, from the input stream. The
- * id is expected to be in the form like
- * 'IDL:test/org/omg/CORBA/ORB/communication/ourUserException:1.0'
- *
- * @param idl the exception idl name.
- * @param input the stream to read from.
- *
- * @return the loaded exception.
- * @return null if the helper class cannot be found.
- */
- public static UserException readUserException(String idl, InputStream input)
- {
- try
- {
- Class helperClass = findHelper(idl);
-
- Method read = helperClass.getMethod("read",
- new Class[] { org.omg.CORBA.portable.InputStream.class });
-
- return (UserException) read.invoke(null, new Object[] { input });
- }
- catch (MARSHAL mex)
- {
- // This one is ok to throw
- throw mex;
- }
- catch (Exception ex)
- {
- ex.printStackTrace();
- return null;
- }
- }
-
- /**
- * Gets the helper class name from the string like
- * 'IDL:test/org/omg/CORBA/ORB/communication/ourUserException:1.0'
- *
- * @param IDL the idl name.
- */
- public static String toHelperName(String IDL)
- {
- String s = IDL;
- int a = s.indexOf(':') + 1;
- int b = s.lastIndexOf(':');
-
- s = IDL.substring(a, b);
-
- if (s.startsWith(OMG_PREFIX))
- s = JAVA_PREFIX + s.substring(OMG_PREFIX.length());
-
- return s.replace('/', '.') + "Helper";
- }
-
- /**
- * Writes the system exception data to CDR output stream.
- *
- * @param output a stream to write data to.
- * @param ex an exception to write.
- */
- public static void writeSystemException(OutputStream output,
- SystemException ex)
- {
- String exIDL = getRepositoryId(ex.getClass());
- output.write_string(exIDL);
- output.write_ulong(ex.minor);
- CompletionStatusHelper.write(output, ex.completed);
- }
-
- /**
- * Converts the given IDL name to class name.
- *
- * @param IDL the idl name.
- *
- */
- protected static String toClassName(String prefix, String IDL)
- {
- String s = IDL;
- int a = s.indexOf(':') + 1;
- int b = s.lastIndexOf(':');
-
- s = IDL.substring(a, b);
-
- if (s.startsWith(OMG_PREFIX))
- s = prefix + s.substring(OMG_PREFIX.length());
-
- return s.replace('/', '.');
- }
-
- /**
- * Converts the given IDL name to class name and tries to load the matching
- * class. The OMG prefix (omg.org) is replaced by the java prefix org.omg. No
- * other prefixes are added.
- *
- * @param IDL the idl name.
- *
- * @return the matching class or null if no such is available.
- */
- public static Class Idl2class(String IDL)
- {
- synchronized (m_classes)
- {
- Class c = (Class) m_classes.get(IDL);
-
- if (c != null)
- return c;
- else
- {
- String s = IDL;
- int a = s.indexOf(':') + 1;
- int b = s.lastIndexOf(':');
-
- s = IDL.substring(a, b);
-
- if (s.startsWith(OMG_PREFIX))
- s = JAVA_PREFIX + s.substring(OMG_PREFIX.length());
-
- String cn = s.replace('/', '.');
-
- try
- {
- c = forName(cn);
- m_classes.put(IDL, c);
- return c;
- }
- catch (ClassNotFoundException ex)
- {
- return null;
- }
- }
- }
- }
-
- /**
- * Converts the given IDL name to class name, tries to load the matching class
- * and create an object instance with parameterless constructor. The OMG
- * prefix (omg.org) is replaced by the java prefix org.omg. No other prefixes
- * are added.
- *
- * @param IDL the idl name.
- *
- * @return instantiated object instance or null if such attempt was not
- * successful.
- */
- public static java.lang.Object Idl2Object(String IDL)
- {
- Class cx = Idl2class(IDL);
-
- try
- {
- if (cx != null)
- return cx.newInstance();
- else
- return null;
- }
- catch (Exception ex)
- {
- return null;
- }
- }
-
- /**
- * Convert the class name to IDL or RMI name (repository id). If the class
- * inherits from IDLEntity, ValueBase or SystemException, returns repository
- * Id in the IDL:(..) form. If it does not, returns repository Id in the
- * RMI:(..) form.
- *
- * @param cx the class for that the name must be computed.
- *
- * @return the idl or rmi name.
- */
- public static synchronized String getRepositoryId(Class cx)
- {
- String name = (String) m_names.get(cx);
- if (name != null)
- return name;
-
- String cn = cx.getName();
- if (!(IDLEntity.class.isAssignableFrom(cx)
- || ValueBase.class.isAssignableFrom(cx) || SystemException.class.isAssignableFrom(cx)))
- {
- // Not an IDL entity.
- name = Util.createValueHandler().getRMIRepositoryID(cx);
- }
- else
- {
- if (cn.startsWith(JAVA_PREFIX))
- cn = OMG_PREFIX
- + cn.substring(JAVA_PREFIX.length()).replace('.', '/');
- else if (cn.startsWith(CLASSPATH_PREFIX))
- cn = OMG_PREFIX
- + cn.substring(CLASSPATH_PREFIX.length()).replace('.', '/');
-
- name = "IDL:" + cn + ":1.0";
- }
- m_names.put(cx, name);
- return name;
- }
-
- /**
- * Insert the passed parameter into the given Any, assuming that the helper
- * class is available. The helper class must have the "Helper" suffix and be
- * in the same package as the class of the object being inserted.
- *
- * @param into the target to insert.
- *
- * @param object the object to insert. It can be any object as far as the
- * corresponding helper is provided.
- *
- * @return true on success, false otherwise.
- */
- public static boolean insertWithHelper(Any into, Object object)
- {
- try
- {
- String helperClassName = object.getClass().getName() + "Helper";
- Class helperClass = forName(helperClassName);
-
- Method insert = helperClass.getMethod("insert", new Class[] {
- Any.class, object.getClass() });
-
- insert.invoke(null, new Object[] { into, object });
-
- return true;
- }
- catch (Exception exc)
- {
- // Failed due some reason.
- return false;
- }
- }
-
- /**
- * Insert the system exception into the given Any.
- */
- public static boolean insertSysException(Any into, SystemException exception)
- {
- try
- {
- BufferedCdrOutput output = new BufferedCdrOutput();
-
- String m_exception_id = getRepositoryId(exception.getClass());
- output.write_string(m_exception_id);
- output.write_ulong(exception.minor);
- CompletionStatusHelper.write(output, exception.completed);
-
- String name = getDefaultName(m_exception_id);
-
- GeneralHolder h = new GeneralHolder(output);
-
- into.insert_Streamable(h);
-
- RecordTypeCode r = new RecordTypeCode(TCKind.tk_except);
- r.setId(m_exception_id);
- r.setName(name);
- into.type(r);
-
- return true;
- }
- catch (Exception ex)
- {
- ex.printStackTrace();
- return false;
- }
- }
-
- /**
- * Get the type name from the IDL string.
- */
- public static String getDefaultName(String idl)
- {
- int f1 = idl.lastIndexOf("/");
- int p1 = (f1 < 0) ? 0 : f1;
- int p2 = idl.indexOf(":", p1);
- if (p2 < 0)
- p2 = idl.length();
-
- String name = idl.substring(f1 + 1, p2);
- return name;
- }
-
- /**
- * Insert this exception into the given Any. On failure, insert the UNKNOWN
- * exception.
- */
- public static void insertException(Any into, Throwable exception)
- {
- boolean ok = false;
- if (exception instanceof SystemException)
- ok = insertSysException(into, (SystemException) exception);
- else if (exception instanceof UserException)
- ok = insertWithHelper(into, exception);
-
- if (!ok)
- ok = insertSysException(into, new UNKNOWN());
- if (!ok)
- throw new InternalError("Exception wrapping broken");
- }
-
- /**
- * Find helper for the class with the given name.
- */
- public static Class findHelper(String idl)
- {
- synchronized (m_helpers)
- {
- Class c = (Class) m_helpers.get(idl);
- if (c != null)
- return c;
- try
- {
- String helper = toHelperName(idl);
- c = forName(helper);
-
- m_helpers.put(idl, c);
- return c;
- }
- catch (Exception ex)
- {
- return null;
- }
- }
- }
-
- /**
- * Load the class with the given name. This method tries to use the context
- * class loader first. If this fails, it searches for the suitable class
- * loader in the caller stack trace. This method is a central point where all
- * requests to find a class by name are delegated.
- */
- public static Class forName(String className) throws ClassNotFoundException
- {
- try
- {
- return Class.forName(className, true,
- Thread.currentThread().getContextClassLoader());
- }
- catch (ClassNotFoundException nex)
- {
- /**
- * Returns the first user defined class loader on the call stack, or
- * null when no non-null class loader was found.
- */
-
-// GCJ LOCAL - We don't have VMStackWalker yet.
-// We only try the SystemClassLoader for now.
-// Class[] ctx = VMStackWalker.getClassContext();
-// for (int i = 0; i < ctx.length; i++)
-// {
-// // Since we live in a class loaded by the bootstrap
-// // class loader, getClassLoader is safe to call without
-// // needing to be wrapped in a privileged action.
-// ClassLoader cl = ctx[i].getClassLoader();
- ClassLoader cl = ClassLoader.getSystemClassLoader();
- try
- {
- if (cl != null)
- return Class.forName(className, true, cl);
- }
- catch (ClassNotFoundException nex2)
- {
- // Try next.
- }
-// }
-
- }
- throw new ClassNotFoundException(className);
- }
-}
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