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/*******************************************************************************
* <copyright>
*
* Copyright (c) 2005, 2010 SAP AG.
* 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:
* Stefan Dimov - initial API, implementation and documentation
*
* </copyright>
*
*******************************************************************************/
package org.eclipse.jpt.jpadiagrameditor.ui.internal.util;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Iterator;
import java.util.List;
import org.eclipse.graphiti.mm.pictograms.Diagram;
import org.eclipse.graphiti.mm.pictograms.Shape;
import org.eclipse.graphiti.services.Graphiti;
import org.eclipse.jdt.core.ICompilationUnit;
import org.eclipse.jdt.core.JavaModelException;
import org.eclipse.jpt.jpa.core.JpaProject;
import org.eclipse.jpt.jpa.core.context.java.JavaPersistentType;
import org.eclipse.jpt.jpa.core.context.persistence.PersistenceUnit;
import org.eclipse.jpt.jpadiagrameditor.ui.internal.JPADiagramEditorPlugin;
public class JPACheckSum {
private static JPACheckSum instance = null;
private static MessageDigest md5 = null;
public static synchronized JPACheckSum INSTANCE() {
if (instance == null) {
try {
md5 = MessageDigest.getInstance("MD5"); //$NON-NLS-1$
} catch (NoSuchAlgorithmException e) {
JPADiagramEditorPlugin.logError("Couldn't create instance of MD5", e); //$NON-NLS-1$
return null;
}
instance = new JPACheckSum();
}
return instance;
}
public String getSavedShapeMD5(Shape sh) {
String checkSumString = Graphiti.getPeService().getPropertyValue(sh, JPAEditorConstants.PROP_ENTITY_CHECKSUM);
if (checkSumString == null)
return ""; //$NON-NLS-1$
return checkSumString;
}
public void assignEntityShapesMD5Strings(Diagram d, JpaProject jpaProject) {
PersistenceUnit pu = JpaArtifactFactory.instance().getPersistenceUnit(jpaProject);
List<Shape> picts = d.getChildren();
if (picts.size() == 0)
return;
Iterator<Shape> it = picts.iterator();
while (it.hasNext()) {
Shape pict = it.next();
String name = Graphiti.getPeService().getPropertyValue(pict, JPAEditorConstants.PROP_ENTITY_CLASS_NAME);
JavaPersistentType jpt = JpaArtifactFactory.instance().getJPT(name, pu);
String hash = ""; //$NON-NLS-1$
if (jpt != null) {
ICompilationUnit cu = JPAEditorUtil.getCompilationUnit(jpt);
hash = generateCompilationUnitMD5String(cu);
}
Graphiti.getPeService().setPropertyValue(pict, JPAEditorConstants.PROP_ENTITY_CHECKSUM, hash);
}
}
public String generateCompilationUnitMD5String(ICompilationUnit cu) {
String src = null;
try {
src = cu.getSource();
} catch (JavaModelException e) {
JPADiagramEditorPlugin.logError("Can't get the source of the compilation unit", e); //$NON-NLS-1$
return null;
}
byte[] res = md5.digest(src.getBytes());
StringBuilder sb = new StringBuilder();
for (byte b : res)
sb.append(Byte.toString(b));
return sb.toString();
}
public boolean isEntityModelChanged(Shape sh, JpaProject jpaProject) {
if (sh == null)
return true;
PersistenceUnit pu = JpaArtifactFactory.instance().getPersistenceUnit(jpaProject);
String name = Graphiti.getPeService().getPropertyValue(sh, JPAEditorConstants.PROP_ENTITY_CLASS_NAME);
JavaPersistentType jpt = JpaArtifactFactory.instance().getJPT(name, pu);
String savedMD5 = getSavedShapeMD5(sh);
String actualMD5 = ""; //$NON-NLS-1$
if (jpt != null) {
ICompilationUnit cu = JPAEditorUtil.getCompilationUnit(jpt);
actualMD5 = generateCompilationUnitMD5String(cu);
}
return !savedMD5.equals(actualMD5);
}
public boolean isModelDifferentFromDiagram(Diagram d, JpaProject jpaProject) {
List<Shape> picts = d.getChildren();
if (picts.size() == 0)
return false;
Iterator<Shape> it = picts.iterator();
while (it.hasNext()) {
Shape pict = it.next();
if (isEntityModelChanged(pict, jpaProject))
return true;
}
return false;
}
}
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