content: /*******************************************************************************
   * Copyright (c) 2000, 2015 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.jsdt.internal.corext.refactoring.changes;
  
  import java.util.HashMap;
  import java.util.Map;
  
  import org.eclipse.core.resources.IResource;
  import org.eclipse.core.resources.ResourcesPlugin;
  import org.eclipse.core.runtime.Assert;
  import org.eclipse.core.runtime.CoreException;
  import org.eclipse.core.runtime.IPath;
  import org.eclipse.core.runtime.IProgressMonitor;
  import org.eclipse.core.runtime.Path;
  import org.eclipse.core.runtime.SubProgressMonitor;
  import org.eclipse.ltk.core.refactoring.Change;
  import org.eclipse.ltk.core.refactoring.NullChange;
  import org.eclipse.ltk.core.refactoring.RefactoringStatus;
  import org.eclipse.wst.jsdt.core.IJavaScriptUnit;
  import org.eclipse.wst.jsdt.core.IJavaScriptElement;
  import org.eclipse.wst.jsdt.core.IPackageFragment;
  import org.eclipse.wst.jsdt.core.JavaScriptCore;
  import org.eclipse.wst.jsdt.core.JavaScriptModelException;
  import org.eclipse.wst.jsdt.internal.corext.refactoring.AbstractJavaElementRenameChange;
  import org.eclipse.wst.jsdt.internal.corext.refactoring.RefactoringCoreMessages;
  import org.eclipse.wst.jsdt.internal.corext.refactoring.util.JavaElementUtil;
  import org.eclipse.wst.jsdt.internal.corext.util.Messages;
  
  public final class RenamePackageChange extends AbstractJavaElementRenameChange {
  
  	private static IPath createPath(String packageName) {
  		return new Path(packageName.replace('.', IPath.SEPARATOR));
  	}
  
  	private Map fCompilationUnitStamps;
  
  	private final boolean fRenameSubpackages;
  
  	public RenamePackageChange(IPackageFragment pack, String newName, boolean renameSubpackages) {
  		this(pack.getPath(), pack.getElementName(), newName, IResource.NULL_STAMP, null, renameSubpackages);
  		Assert.isTrue(!pack.isReadOnly(), "package must not be read only"); //$NON-NLS-1$
  	}
  
  	private RenamePackageChange(IPath resourcePath, String oldName, String newName, long stampToRestore, Map compilationUnitStamps, boolean renameSubpackages) {
  		super(resourcePath, oldName, newName, stampToRestore);
  		fCompilationUnitStamps= compilationUnitStamps;
  		fRenameSubpackages= renameSubpackages;
  	}
  
  	private void addStamps(Map stamps, IJavaScriptUnit[] units) {
  		for (int i= 0; i < units.length; i++) {
  			IResource resource= units[i].getResource();
  			long stamp= IResource.NULL_STAMP;
  			if (resource != null && (stamp= resource.getModificationStamp()) != IResource.NULL_STAMP) {
  				stamps.put(resource, Long.valueOf(stamp));
  			}
  		}
  	}
  
  	protected IPath createNewPath() {
  		IPackageFragment oldPackage= getPackage();
  		IPath oldPackageName= createPath(oldPackage.getElementName());
  		IPath newPackageName= createPath(getNewName());
  		return getResourcePath().removeLastSegments(oldPackageName.segmentCount()).append(newPackageName);
  	}
  
  	protected IPath createNewPath(IPackageFragment oldPackage) {
  		IPath oldPackagePath= createPath(oldPackage.getElementName());
  		IPath newPackagePath= createPath(getNewName(oldPackage));
  		return oldPackage.getPath().removeLastSegments(oldPackagePath.segmentCount()).append(newPackagePath);
  	}
  
  	protected Change createUndoChange(long stampToRestore) throws CoreException {
  		IPackageFragment pack= getPackage();
  		if (pack == null)
  			return new NullChange();
  		Map stamps= new HashMap();
  		if (!fRenameSubpackages) {
  			addStamps(stamps, pack.getJavaScriptUnits());
  		} else {
  			IPackageFragment[] allPackages= JavaElementUtil.getPackageAndSubpackages(pack);
  			for (int i= 0; i < allPackages.length; i++) {
  				IPackageFragment currentPackage= allPackages[i];
  				addStamps(stamps, currentPackage.getJavaScriptUnits());
  			}
  		}
  		return new RenamePackageChange(createNewPath(), getNewName(), getOldName(), stampToRestore, stamps, fRenameSubpackages);
  		// Note: This reverse change only works if the renamePackage change did
  		// not merge the source package into an existing target.
  	}
  
  	protected void doRename(IProgressMonitor pm) throws CoreException {
  		IPackageFragment pack= getPackage();
  		if (pack == null)
  			return;
  
  		if (!fRenameSubpackages) {
  			renamePackage(pack, pm, createNewPath(), getNewName());
  		} else {
  			IPackageFragment[] allPackages= JavaElementUtil.getPackageAndSubpackages(pack);
  
  			pm.beginTask("", allPackages.length); //$NON-NLS-1$
  			try {
  				for (int i= 0; i < allPackages.length; i++) {
  					IPackageFragment currentPackage= allPackages[i];
  					renamePackage(currentPackage, new SubProgressMonitor(pm, 1), createNewPath(currentPackage), getNewName(currentPackage));
  				}
  			} finally {
  				pm.done();
  			}
  		}
  	}
  
  	public String getName() {
  		String msg= fRenameSubpackages ? RefactoringCoreMessages.RenamePackageChange_name_with_subpackages : RefactoringCoreMessages.RenamePackageChange_name;
  		return Messages.format(msg, new String[] { getOldName(), getNewName()});
  	}
  
  	private String getNewName(IPackageFragment subpackage) {
  		return getNewName() + subpackage.getElementName().substring(getOldName().length());
  	}
  
  	private IPackageFragment getPackage() {
  		return (IPackageFragment) getModifiedElement();
  	}
  
  	public RefactoringStatus isValid(IProgressMonitor pm) throws CoreException {
  		pm.beginTask("", 2); //$NON-NLS-1$
  		RefactoringStatus result;
  		try {
  			result= new RefactoringStatus();
  			IJavaScriptElement element= (IJavaScriptElement) getModifiedElement();
  			// don't check for read-only since we don't go through
  			// validate edit.
  			result.merge(isValid(new SubProgressMonitor(pm, 1), DIRTY));
  			if (result.hasFatalError())
  				return result;
  			if (element != null && element.exists() && element instanceof IPackageFragment) {
  				IPackageFragment pack= (IPackageFragment) element;
  				if (fRenameSubpackages) {
  					IPackageFragment[] allPackages= JavaElementUtil.getPackageAndSubpackages(pack);
  					SubProgressMonitor subPm= new SubProgressMonitor(pm, 1);
  					subPm.beginTask("", allPackages.length); //$NON-NLS-1$
  					for (int i= 0; i < allPackages.length; i++) {
  						// don't check for read-only since we don't go through
  						// validate edit.
  						checkIfModifiable(result, allPackages[i], DIRTY);
  						if (result.hasFatalError())
  							return result;
  						isValid(result, allPackages[i], new SubProgressMonitor(subPm, 1));
  					}
  				} else {
  					isValid(result, pack, new SubProgressMonitor(pm, 1));
  				}
  			}
  		} finally {
  			pm.done();
  		}
  		return result;
  	}
  
  	private void isValid(RefactoringStatus result, IPackageFragment pack, IProgressMonitor pm) throws JavaScriptModelException {
  		IJavaScriptUnit[] units= pack.getJavaScriptUnits();
  		pm.beginTask("", units.length); //$NON-NLS-1$
  		for (int i= 0; i < units.length; i++) {
  			pm.subTask(Messages.format(RefactoringCoreMessages.RenamePackageChange_checking_change, pack.getElementName()));
  			checkIfModifiable(result, units[i], READ_ONLY | DIRTY);
  			pm.worked(1);
  		}
  		pm.done();
  	}
  
  	private void renamePackage(IPackageFragment pack, IProgressMonitor pm, IPath newPath, String newName) throws JavaScriptModelException, CoreException {
  		pack.rename(newName, false, pm);
  		if (fCompilationUnitStamps != null) {
  			IPackageFragment newPack= (IPackageFragment) JavaScriptCore.create(ResourcesPlugin.getWorkspace().getRoot().getFolder(newPath));
  			if (newPack.exists()) {
  				IJavaScriptUnit[] units= newPack.getJavaScriptUnits();
  				for (int i= 0; i < units.length; i++) {
  					IResource resource= units[i].getResource();
  					if (resource != null) {
  						Long stamp= (Long) fCompilationUnitStamps.get(resource);
  						if (stamp != null) {
  							resource.revertModificationStamp(stamp.longValue());
  						}
  					}
  				}
  			}
  		}
  	}
  }
  