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/*******************************************************************************
* Copyright (c) 2001, 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.jem.internal.beaninfo.vm;
/*
*/
import java.beans.*;
import java.util.*;
/**
* Equality tester for MethodDescriptors
*/
public class MethodDescriptorEquality extends FeatureDescriptorEquality {
static void INIT() {
try {
MAP_EQUALITY.put(MethodDescriptor.class, (MethodDescriptorEquality.class).getConstructor(new Class[] {MethodDescriptor.class}));
} catch (NoSuchMethodException e) {
}
}
private ArrayList fParameterDescriptors; // Array of ParameterDescriptorEquality's.
public MethodDescriptorEquality() {
}
public MethodDescriptorEquality(MethodDescriptor descr) {
super(descr);
}
/**
* A new feature is being set into this object,
* clear any cache members so that they can be reconstructed.
*
* NOTE: Subclasses - remember to call super.clearFeature();
*/
protected void clearFeature() {
super.clearFeature();
fParameterDescriptors = null;
}
protected ArrayList parameterDescriptors() {
if (fParameterDescriptors == null) {
ParameterDescriptor[] pds = ((MethodDescriptor) fFeature).getParameterDescriptors();
if (pds != null) {
fParameterDescriptors = new ArrayList(pds.length);
for (int i=0; i<pds.length; i++)
fParameterDescriptors.add(new ParameterDescriptorEquality(pds[i]));
}
}
return fParameterDescriptors;
}
/**
* Calculate the hashcode for the current feature, add this
* to the hashcode received from super.calculateHashCode
* and return the new value.
*
* NOTE: for subclasses, it is MANDITORY that the first line be:
* int hashcode = super.calculateHashCode();
* and the last line be:
* return hashcode*31 + (your calculated hashcode for just this subclass);
*/
protected int calculateHashCode() {
int hashcode = super.calculateHashCode();
MethodDescriptor bd = (MethodDescriptor) fFeature;
int hc = bd.getMethod().hashCode();
if (parameterDescriptors() != null)
hc += parameterDescriptors().hashCode();
return hashcode*31 + hc;
}
public boolean equals(Object obj) {
if (identityTest(obj))
return true;
if (!super.equals(obj))
return false;
MethodDescriptorEquality oem = (MethodDescriptorEquality) obj;
MethodDescriptor om = (MethodDescriptor) oem.fFeature;
MethodDescriptor fm = (MethodDescriptor) fFeature;
if (fm.getMethod() != om.getMethod())
return false;
if (fParameterDescriptors != null || oem.fParameterDescriptors != null) {
// We are in a Map lookup situation, so one side has listener method equalities, so we will compare that way.
if (parameterDescriptors() == null)
if (((MethodDescriptorEquality) obj).parameterDescriptors() != null)
return false;
else ;
else
if (!parameterDescriptors().equals(((MethodDescriptorEquality) obj).parameterDescriptors()))
return false;
} else {
// We are in the building the list phases, don't waste space building entire list.
ParameterDescriptor[] ours = fm.getParameterDescriptors();
ParameterDescriptor[] theirs = om.getParameterDescriptors();
if (ours == theirs)
return true;
else if (ours == null)
if (theirs != null)
return false;
else
;
else if (theirs == null)
return false;
else if (ours.length != theirs.length)
return false;
else if (ours.length > 0) {
ParameterDescriptorEquality workingOurs = new ParameterDescriptorEquality();
ParameterDescriptorEquality workingThiers = new ParameterDescriptorEquality();
for (int i = 0; i < ours.length; i++) {
workingOurs.setFeature(ours[i]);
workingThiers.setFeature(theirs[i]);
if (!workingOurs.equals(workingThiers))
return false;
}
}
}
return true;
}
}
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