/*******************************************************************************
* Copyright (c) 2002 - 2006 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.ipa.callgraph;
import com.ibm.wala.analysis.typeInference.PointType;
import com.ibm.wala.classLoader.IClass;
import com.ibm.wala.ipa.callgraph.propagation.InstanceKey;
import com.ibm.wala.util.debug.Assertions;
/**
* misc utilities for dealing with contexts
*/
public class ContextUtil {
/**
* @param c a context
* @return If this is an object-sensitive context that identifies a unique class for the receiver object, then return the unique
* class. Else, return null.
* @throws IllegalArgumentException if c is null
*/
public static IClass getConcreteClassFromContext(Context c) {
if (c == null) {
throw new IllegalArgumentException("c is null");
}
ContextItem item = c.get(ContextKey.RECEIVER);
if (item == null) {
return null;
} else {
if (item instanceof PointType) {
return ((PointType) item).getIClass();
} else if (item instanceof InstanceKey) {
return ((InstanceKey) item).getConcreteType();
} else {
Assertions.UNREACHABLE("Unexpected: " + item.getClass());
return null;
}
}
}
}