/******************************************************************************
 * Copyright (c) 2002 - 2012 IBM Corporation.
 * 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 com.ibm.wala.cast.js.callgraph.fieldbased.flowgraph.vertices;

import com.ibm.wala.cast.js.ssa.JavaScriptInvoke;
import com.ibm.wala.cast.js.types.JavaScriptMethods;
import com.ibm.wala.classLoader.CallSiteReference;

/**
 * A call vertex represents the possible callees of a function call or <code>new</code> expression.
 * 
 * @author mschaefer
 *
 */
public class CallVertex extends Vertex {
	// method containing the call
	private final FuncVertex func;
	
	// PC of the call site
	private final CallSiteReference site;
	
	// the call instruction itself
	private final JavaScriptInvoke invk;

	CallVertex(FuncVertex func, CallSiteReference site, JavaScriptInvoke invk) {
		this.func = func;
		this.site = site;
		this.invk = invk;
	}

	public FuncVertex getCaller() {
		return func;
	}

	public CallSiteReference getSite() {
		return site;
	}
	
	public JavaScriptInvoke getInstruction() {
		return invk;
	}
	
	/**
	 * Does this call vertex correspond to a <code>new</code> instruction? 
	 */
	public boolean isNew() {
		return site.getDeclaredTarget() == JavaScriptMethods.ctorReference;
	}

	@Override
	public <T> T accept(VertexVisitor<T> visitor) {
		return visitor.visitCalleeVertex(this);
	}
	
	@Override
	public String toString() {
		return "Callee(" + func + ", " + site + ")";
	}
}