/*******************************************************************************
 * Copyright (c) 2012 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.wst.jsdt.debug.internal.jsd2.jsdi;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.eclipse.wst.jsdt.debug.core.breakpoints.IJavaScriptBreakpoint;
import org.eclipse.wst.jsdt.debug.core.jsdi.BooleanValue;
import org.eclipse.wst.jsdt.debug.core.jsdi.NullValue;
import org.eclipse.wst.jsdt.debug.core.jsdi.NumberValue;
import org.eclipse.wst.jsdt.debug.core.jsdi.StringValue;
import org.eclipse.wst.jsdt.debug.core.jsdi.UndefinedValue;
import org.eclipse.wst.jsdt.debug.core.jsdi.VirtualMachine;
import org.eclipse.wst.jsdt.debug.core.jsdi.event.EventQueue;
import org.eclipse.wst.jsdt.debug.core.jsdi.request.EventRequestManager;
import org.eclipse.wst.jsdt.debug.transport.DebugSession;

/**
 * The JSD2 implementation of a {@link VirtualMachine}
 * @since 1.0
 */
public class VirtualMachineImpl implements VirtualMachine {

	final NullValue fNullValue = new NullValueImpl(this);
	final UndefinedValue fUndefinedValue = new UndefinedValueImpl(this);
	
	/**
	 * The backing debug session
	 */
	DebugSession fSession = null;
	
	private Map fThreads = null;
	private Map fScripts = null;
	
	/**
	 * Constructor
	 * @param session
	 */
	public VirtualMachineImpl(DebugSession session) {
		fSession = session;
	}

	/* (non-Javadoc)
	 * @see org.eclipse.wst.jsdt.debug.core.jsdi.VirtualMachine#resume()
	 */
	public void resume() {
	}

	/* (non-Javadoc)
	 * @see org.eclipse.wst.jsdt.debug.core.jsdi.VirtualMachine#suspend()
	 */
	public void suspend() {
	}

	/* (non-Javadoc)
	 * @see org.eclipse.wst.jsdt.debug.core.jsdi.VirtualMachine#terminate()
	 */
	public void terminate() {
	}

	/* (non-Javadoc)
	 * @see org.eclipse.wst.jsdt.debug.core.jsdi.VirtualMachine#name()
	 */
	public String name() {
		return null;
	}

	/* (non-Javadoc)
	 * @see org.eclipse.wst.jsdt.debug.core.jsdi.VirtualMachine#description()
	 */
	public String description() {
		return null;
	}

	/* (non-Javadoc)
	 * @see org.eclipse.wst.jsdt.debug.core.jsdi.VirtualMachine#version()
	 */
	public String version() {
		return null;
	}

	/* (non-Javadoc)
	 * @see org.eclipse.wst.jsdt.debug.core.jsdi.VirtualMachine#allThreads()
	 */
	public List/*<ThreadReference>*/ allThreads() {
		if(fThreads == null) {
			fThreads = Collections.synchronizedMap(new HashMap());
		}
		return new ArrayList(fThreads.values());
	}

	/* (non-Javadoc)
	 * @see org.eclipse.wst.jsdt.debug.core.jsdi.VirtualMachine#allScripts()
	 */
	public List/*<ScriptReference>*/ allScripts() {
		if(fScripts == null) {
			fScripts = Collections.synchronizedMap(new HashMap());
		}
		return new ArrayList(fScripts.values());
	}

	/* (non-Javadoc)
	 * @see org.eclipse.wst.jsdt.debug.core.jsdi.VirtualMachine#dispose()
	 */
	public void dispose() {
		if(fScripts != null) {
			fScripts.clear();
			fScripts = null;
		}
		if(fThreads != null) {
			fThreads.clear();
			fThreads = null;
		}
	}

	/* (non-Javadoc)
	 * @see org.eclipse.wst.jsdt.debug.core.jsdi.VirtualMachine#mirrorOfUndefined()
	 */
	public UndefinedValue mirrorOfUndefined() {
		return fUndefinedValue;
	}

	/* (non-Javadoc)
	 * @see org.eclipse.wst.jsdt.debug.core.jsdi.VirtualMachine#mirrorOfNull()
	 */
	public NullValue mirrorOfNull() {
		return fNullValue;
	}

	/* (non-Javadoc)
	 * @see org.eclipse.wst.jsdt.debug.core.jsdi.VirtualMachine#mirrorOf(boolean)
	 */
	public BooleanValue mirrorOf(boolean bool) {
		return null;
	}

	/* (non-Javadoc)
	 * @see org.eclipse.wst.jsdt.debug.core.jsdi.VirtualMachine#mirrorOf(java.lang.Number)
	 */
	public NumberValue mirrorOf(Number number) {
		return null;
	}

	/* (non-Javadoc)
	 * @see org.eclipse.wst.jsdt.debug.core.jsdi.VirtualMachine#mirrorOf(java.lang.String)
	 */
	public StringValue mirrorOf(String string) {
		return null;
	}

	/* (non-Javadoc)
	 * @see org.eclipse.wst.jsdt.debug.core.jsdi.VirtualMachine#eventRequestManager()
	 */
	public EventRequestManager eventRequestManager() {
		return null;
	}

	/* (non-Javadoc)
	 * @see org.eclipse.wst.jsdt.debug.core.jsdi.VirtualMachine#eventQueue()
	 */
	public EventQueue eventQueue() {
		return null;
	}

	/* (non-Javadoc)
	 * @see org.eclipse.wst.jsdt.debug.core.jsdi.VirtualMachine#canUpdateBreakpoints()
	 */
	public boolean canUpdateBreakpoints() {
		return false;
	}

	/* (non-Javadoc)
	 * @see org.eclipse.wst.jsdt.debug.core.jsdi.VirtualMachine#updateBreakpoint(org.eclipse.wst.jsdt.debug.core.breakpoints.IJavaScriptBreakpoint)
	 */
	public void updateBreakpoint(IJavaScriptBreakpoint breakpoint) {
	}
}