content: /*******************************************************************************
   * Copyright (c) 2000, 2008 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 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.ltk.core.refactoring.Change;
  import org.eclipse.ltk.core.refactoring.RefactoringStatus;
  import org.eclipse.wst.jsdt.core.IIncludePathEntry;
  import org.eclipse.wst.jsdt.core.IJavaScriptProject;
  import org.eclipse.wst.jsdt.core.IPackageFragmentRoot;
  import org.eclipse.wst.jsdt.core.JavaScriptCore;
  import org.eclipse.wst.jsdt.internal.corext.refactoring.RefactoringCoreMessages;
  import org.eclipse.wst.jsdt.internal.corext.refactoring.base.JDTChange;
  
  public class DeleteFromClasspathChange extends JDTChange {
  
  	private final String fProjectHandle;
  	private final IPath fPathToDelete;
  	
  	private IPath fPath;
  	private IPath fSourceAttachmentPath;
  	private IPath fSourceAttachmentRootPath;
  	private int fEntryKind;
  	
  	public DeleteFromClasspathChange(IPackageFragmentRoot root) {
  		this(root.getPath(), root.getJavaScriptProject());
  	}
  	
  	DeleteFromClasspathChange(IPath pathToDelete, IJavaScriptProject project){
  		Assert.isNotNull(pathToDelete);
  		fPathToDelete= pathToDelete;
  		fProjectHandle= project.getHandleIdentifier();
  	}
  	
  	public RefactoringStatus isValid(IProgressMonitor pm) throws CoreException {
  		// we have checked the .classpath file in the delete change.
  		return super.isValid(pm, READ_ONLY | DIRTY);
  	}
  	
  	public Change perform(IProgressMonitor pm)	throws CoreException {
  		pm.beginTask(getName(), 1);
  		try{
  			IJavaScriptProject project= getJavaProject();
  			IIncludePathEntry[] cp= project.getRawIncludepath();
  			IIncludePathEntry[] newCp= new IIncludePathEntry[cp.length-1];
  			int i= 0; 
  			int j= 0;
  			while (j < newCp.length) {
  				IIncludePathEntry current= JavaScriptCore.getResolvedIncludepathEntry(cp[i]);
  				if (current != null && toBeDeleted(current)) {
  					i++;
  					setDeletedEntryProperties(current);
  				} 
  
  				newCp[j]= cp[i];
  				i++;
  				j++;
  			}
  			
  			IIncludePathEntry last= JavaScriptCore.getResolvedIncludepathEntry(cp[cp.length - 1]);
  			if (last != null && toBeDeleted(last))
  				setDeletedEntryProperties(last);
  				
  			project.setRawIncludepath(newCp, pm);
  			
  			return new AddToClasspathChange(getJavaProject(), fEntryKind, fPath, 
  				fSourceAttachmentPath, fSourceAttachmentRootPath);
  		} finally {
  			pm.done();
  		}
  	}
  	
  	private boolean toBeDeleted(IIncludePathEntry entry){
  		if (entry == null) //safety net
  			return false; 
  		return fPathToDelete.equals(entry.getPath());
  	}
  	
  	private void setDeletedEntryProperties(IIncludePathEntry entry){
  		fEntryKind= entry.getEntryKind();
  		fPath= entry.getPath();
  		fSourceAttachmentPath= entry.getSourceAttachmentPath();
  		fSourceAttachmentRootPath= entry.getSourceAttachmentRootPath();
  	}
  	
  	private IJavaScriptProject getJavaProject(){
  		return (IJavaScriptProject)JavaScriptCore.create(fProjectHandle);
  	}
  	
  	public String getName() {
  		return RefactoringCoreMessages.DeleteFromClassPathChange_remove + getJavaProject().getElementName(); 
  	}
  
  	public Object getModifiedElement() {
  		return getJavaProject();
  	}
  }
  