/*******************************************************************************
 * 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.JdwpClassObjectID;
import org.eclipse.jdi.internal.jdwp.JdwpID;
import org.eclipse.jdi.internal.jdwp.JdwpInterfaceID;

import com.sun.jdi.ClassNotPreparedException;
import com.sun.jdi.InterfaceType;
import com.sun.jdi.Value;

/**
 * this class implements the corresponding interfaces
 * declared by the JDI specification. See the com.sun.jdi package
 * for more information.
 *
 */
public class InterfaceTypeImpl extends ReferenceTypeImpl implements InterfaceType {
	/** JDWP Tag. */
	public static final byte typeTag = JdwpID.TYPE_TAG_INTERFACE;

	/**
	 * Creates new InterfaceTypeImpl.
	 */
	public InterfaceTypeImpl(VirtualMachineImpl vmImpl, JdwpInterfaceID interfaceID) {
		super("InterfaceType", vmImpl, interfaceID); //$NON-NLS-1$
	}

	/**
	 * Creates new InterfaceTypeImpl.
	 */
	public InterfaceTypeImpl(VirtualMachineImpl vmImpl, JdwpInterfaceID interfaceID, String signature, String genericSignature) {
		super("InterfaceType", vmImpl, interfaceID, signature, genericSignature); //$NON-NLS-1$
	}

	/**
	 * @return Create a null value instance of the type.
	 */
	public Value createNullValue() {
		return new ClassObjectReferenceImpl(virtualMachineImpl(), new JdwpClassObjectID(virtualMachineImpl()));
	}

	/**
	 * @return Returns type tag.
	 */
	public byte typeTag() {
		return typeTag;
	}
	
	/**
	 * Flushes all stored Jdwp results.
	 */
	public void flushStoredJdwpResults() {
		super.flushStoredJdwpResults();

		// For all reftypes that have this interface cached, this cache must be undone.
		Iterator itr = virtualMachineImpl().allCachedRefTypes();
		while (itr.hasNext()) {
			ReferenceTypeImpl refType = (ReferenceTypeImpl)itr.next();
			if (refType.fInterfaces != null && refType.fInterfaces.contains(this)) {
				refType.flushStoredJdwpResults();
			}
		}
		
	}
	
	/**
	 * @return Returns the currently prepared classes which directly implement this interface.
	 */
	public List implementors() {
		// Note that this information should not be cached.
		List implementors = new ArrayList();
		Iterator itr = virtualMachineImpl().allRefTypes();
		while (itr.hasNext()) {
			ReferenceTypeImpl refType = (ReferenceTypeImpl)itr.next();
			if (refType instanceof ClassTypeImpl) {
				try {
					ClassTypeImpl classType = (ClassTypeImpl)refType;
					List interfaces = classType.interfaces();
					if (interfaces.contains(this)) {
						implementors .add(classType);
					}
				} catch (ClassNotPreparedException e) {
					continue;
				}
			}
		}
		return implementors;
	}
	
	/**
	 * @return Returns the currently prepared interfaces which directly extend this interface. 
	 */
	public List subinterfaces() {
		// Note that this information should not be cached.
		List implementors = new ArrayList();
		Iterator itr = virtualMachineImpl().allRefTypes();
		while (itr.hasNext()) {
			try {
				ReferenceTypeImpl refType = (ReferenceTypeImpl)itr.next();
				if (refType instanceof InterfaceTypeImpl) {
					InterfaceTypeImpl interFaceType = (InterfaceTypeImpl)refType;
					List interfaces = interFaceType.superinterfaces();
					if (interfaces.contains(this)) {
						implementors.add(interFaceType);
					}
				}
			} catch (ClassNotPreparedException e) {
				continue;
			}
		}
		return implementors;
	}
	
	/**
	 * @return Returns the interfaces directly extended by this interface. 
	 */
	public List superinterfaces() {
		return interfaces();
	}
	
	/** 
	 * @return Returns true if this type has been initialized.
	 */
	public boolean isInitialized() {
		return isPrepared();
	}

	/**
	 * @return Reads ID and returns known ReferenceTypeImpl with that ID, or if ID is unknown a newly created ReferenceTypeImpl.
	 */
	public static InterfaceTypeImpl read(MirrorImpl target, DataInputStream in) throws IOException {
		VirtualMachineImpl vmImpl = target.virtualMachineImpl();
		JdwpInterfaceID ID = new JdwpInterfaceID(vmImpl);
		ID.read(in);
		if (target.fVerboseWriter != null) {
			target.fVerboseWriter.println("interfaceType", ID.value()); //$NON-NLS-1$
		}

		if (ID.isNull()) {
			return null;
		}
			
		InterfaceTypeImpl mirror = (InterfaceTypeImpl)vmImpl.getCachedMirror(ID);
		if (mirror == null) {
			mirror = new InterfaceTypeImpl(vmImpl, ID);
			vmImpl.addCachedMirror(mirror);
		}
		return mirror;
	 }
	
	/**
	 * @return Reads ID and returns known ReferenceTypeImpl with that ID, or if ID is unknown a newly created ReferenceTypeImpl.
	 */
	public static InterfaceTypeImpl readWithSignature(MirrorImpl target, boolean withGenericSignature, DataInputStream in) throws IOException {
		VirtualMachineImpl vmImpl = target.virtualMachineImpl();
		JdwpInterfaceID ID = new JdwpInterfaceID(vmImpl);
		ID.read(in);
		if (target.fVerboseWriter != null) {
			target.fVerboseWriter.println("interfaceType", ID.value()); //$NON-NLS-1$
		}

		String signature = target.readString("signature", in); //$NON-NLS-1$
		String genericSignature= null;
		if (withGenericSignature) {
			genericSignature= target.readString("generic signature", in); //$NON-NLS-1$
		}
		if (ID.isNull()) {
			return null;
		}
			
		InterfaceTypeImpl mirror = (InterfaceTypeImpl)vmImpl.getCachedMirror(ID);
		if (mirror == null) {
			mirror = new InterfaceTypeImpl(vmImpl, ID);
			vmImpl.addCachedMirror(mirror);
		}
		mirror.setSignature(signature);
		mirror.setGenericSignature(genericSignature);
		return mirror;
	 }
}