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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.wst.dtd.core.internal.emf.util;
import java.util.Collection;
import java.util.Hashtable;
import java.util.Iterator;
import java.util.Vector;
import org.eclipse.wst.dtd.core.internal.emf.DTDElement;
import org.eclipse.wst.dtd.core.internal.emf.DTDElementReferenceContent;
import org.eclipse.wst.dtd.core.internal.emf.DTDFile;
public class DTDMetrics {
protected DTDFile dtdFile;
protected Hashtable elementReferenceMap;
public DTDMetrics(DTDFile dtdFile) {
this.dtdFile = dtdFile;
}
public Hashtable getElementReferences() {
if (elementReferenceMap == null) {
elementReferenceMap = new Hashtable();
new DTDVisitor() {
public void visitDTDElementReferenceContent(DTDElementReferenceContent elementReferenceContent) {
DTDElement dtdElement = elementReferenceContent.getReferencedElement();
Object visitation = elementReferenceMap.get(dtdElement);
if (visitation == null) {
elementReferenceMap.put(dtdElement, visitation = new Vector());
}
((Vector) visitation).addElement(elementReferenceContent);
}
}.visitDTDFile(dtdFile);
}
return elementReferenceMap;
}
public int getElementReferenceCount(DTDElement dtdElement) {
Object elementReferences = getElementReferences().get(dtdElement);
return elementReferences == null ? 0 : ((Vector) elementReferences).size();
}
public DTDElement getLeastReferencedElement() {
DTDElement result = null;
int lowestReferenceCount = Integer.MAX_VALUE;
Collection elements = dtdFile.listDTDElement();
for (Iterator i = elements.iterator(); i.hasNext();) {
DTDElement element = (DTDElement) i.next();
int count = getElementReferenceCount(element);
if (count < lowestReferenceCount) {
result = element;
lowestReferenceCount = count;
}
}
return result;
}
/**
* @generated
*/
protected Hashtable getElementReferencesGen() {
if (elementReferenceMap == null) {
elementReferenceMap = new Hashtable();
new DTDVisitor() {
public void visitDTDElementReferenceContent(DTDElementReferenceContent elementReferenceContent) {
DTDElement dtdElement = elementReferenceContent.getReferencedElement();
Object visitation = elementReferenceMap.get(dtdElement);
if (visitation == null) {
elementReferenceMap.put(dtdElement, visitation = new Vector());
}
((Vector) visitation).addElement(elementReferenceContent);
}
}.visitDTDFile(dtdFile);
}
return elementReferenceMap;
}
/**
* @generated
*/
protected int getElementReferenceCountGen(DTDElement dtdElement) {
Object elementReferences = getElementReferences().get(dtdElement);
return elementReferences == null ? 0 : ((Vector) elementReferences).size();
}
/**
* @generated
*/
protected DTDElement getLeastReferencedElementGen() {
DTDElement result = null;
int lowestReferenceCount = Integer.MAX_VALUE;
Collection elements = dtdFile.listDTDElement();
for (Iterator i = elements.iterator(); i.hasNext();) {
DTDElement element = (DTDElement) i.next();
int count = getElementReferenceCount(element);
if (count < lowestReferenceCount) {
result = element;
lowestReferenceCount = count;
}
}
return result;
}
}
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