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/*******************************************************************************
 * Copyright (c) 2000, 2005 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jdi.internal;


import java.io.DataInputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import org.eclipse.jdi.internal.jdwp.JdwpClassLoaderID;
import org.eclipse.jdi.internal.jdwp.JdwpCommandPacket;
import org.eclipse.jdi.internal.jdwp.JdwpID;
import org.eclipse.jdi.internal.jdwp.JdwpReplyPacket;

import com.sun.jdi.ClassLoaderReference;
import com.sun.jdi.ClassNotPreparedException;
import com.sun.jdi.ReferenceType;

/**
 * this class implements the corresponding interfaces
 * declared by the JDI specification. See the com.sun.jdi package
 * for more information.
 *
 */
public class ClassLoaderReferenceImpl extends ObjectReferenceImpl implements ClassLoaderReference {
  /** JDWP Tag. */
  public static final byte tag = JdwpID.CLASS_LOADER_TAG;

  /**
   * Creates new ClassLoaderReferenceImpl.
   */
  public ClassLoaderReferenceImpl(VirtualMachineImpl vmImpl, JdwpClassLoaderID classLoaderID) {
    super("ClassLoaderReference", vmImpl, classLoaderID); //$NON-NLS-1$
  }

  /**
   * @returns Value tag.
   */
  public byte getTag() {
    return tag;
  }
  
  /**
   * @returns Returns a list of all loaded classes that were defined by this class loader.
   */
  public List definedClasses() {
    // Note that this information should not be cached.
    List visibleClasses= visibleClasses();
    List result = new ArrayList(visibleClasses.size());
    Iterator iter = visibleClasses.iterator();
    while (iter.hasNext()) {
      try {
        ReferenceType type = (ReferenceType)iter.next();
        // Note that classLoader() is null for the bootstrap classloader.
        if (type.classLoader() != null && type.classLoader().equals(this))
          result.add(type);
      } catch (ClassNotPreparedException e) {
        continue;
      }
    }
    return result;
  }

  /**
   * @returns Returns a list of all loaded classes that are visible by this class loader.
   */
  public List visibleClasses() {
    // Note that this information should not be cached.
    initJdwpRequest();
    try {
      JdwpReplyPacket replyPacket = requestVM(JdwpCommandPacket.CLR_VISIBLE_CLASSES, this);
      defaultReplyErrorHandler(replyPacket.errorCode());
      DataInputStream replyData = replyPacket.dataInStream();
      int nrOfElements = readInt("elements", replyData); //$NON-NLS-1$
      List elements = new ArrayList(nrOfElements);
      for (int i = 0; i < nrOfElements; i++) {
        ReferenceTypeImpl elt = ReferenceTypeImpl.readWithTypeTag(this, replyData);
        if (elt == null)
          continue;
        elements.add(elt);
      }
      return elements;
    } catch (IOException e) {
      defaultIOExceptionHandler(e);
      return null;
    } finally {
      handledJdwpRequest();
    }
  }
  
  /**
   * @return Reads JDWP representation and returns new instance.
   */
  public static ClassLoaderReferenceImpl read(MirrorImpl target, DataInputStream in)  throws IOException {
    VirtualMachineImpl vmImpl = target.virtualMachineImpl();
    JdwpClassLoaderID ID = new JdwpClassLoaderID(vmImpl);
    ID.read(in);
    if (target.fVerboseWriter != null)
      target.fVerboseWriter.println("classLoaderReference", ID.value()); //$NON-NLS-1$

    if (ID.isNull())
      return null;

    ClassLoaderReferenceImpl mirror = new ClassLoaderReferenceImpl(vmImpl, ID);
    return mirror;
  }
}
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