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.ui.refactoring.contentassist;
  
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.List;
  
  import org.eclipse.core.resources.ResourcesPlugin;
  import org.eclipse.core.runtime.Assert;
  import org.eclipse.jface.contentassist.IContentAssistSubjectControl;
  import org.eclipse.jface.contentassist.ISubjectControlContentAssistProcessor;
  import org.eclipse.jface.preference.IPreferenceStore;
  import org.eclipse.jface.text.ITextViewer;
  import org.eclipse.jface.text.contentassist.ICompletionProposal;
  import org.eclipse.jface.text.contentassist.IContentAssistProcessor;
  import org.eclipse.jface.text.contentassist.IContextInformation;
  import org.eclipse.jface.text.contentassist.IContextInformationValidator;
  import org.eclipse.swt.graphics.Image;
  import org.eclipse.wst.jsdt.core.IJavaScriptModel;
  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.core.JavaScriptModelException;
  import org.eclipse.wst.jsdt.internal.ui.JavaScriptPlugin;
  import org.eclipse.wst.jsdt.internal.ui.text.java.JavaCompletionProposal;
  import org.eclipse.wst.jsdt.ui.JavaScriptElementLabelProvider;
  import org.eclipse.wst.jsdt.ui.PreferenceConstants;
  import org.eclipse.wst.jsdt.ui.text.java.CompletionProposalComparator;
  
  /**
   * Simple completion processor that completes package fragment roots that are source
   * folders.
   */
  public class JavaSourcePackageFragmentRootCompletionProcessor implements IContentAssistProcessor, ISubjectControlContentAssistProcessor {
  
  	private char[] fProposalAutoActivationSet;
  	private IJavaScriptModel fRoot;
  	private CompletionProposalComparator fComparator;
  	private JavaScriptElementLabelProvider fLabelProvider;
  
  	public JavaSourcePackageFragmentRootCompletionProcessor() {
  		fRoot= JavaScriptCore.create(ResourcesPlugin.getWorkspace().getRoot());
  		IPreferenceStore preferenceStore= JavaScriptPlugin.getDefault().getPreferenceStore();
  		String triggers= preferenceStore.getString(PreferenceConstants.CODEASSIST_AUTOACTIVATION_TRIGGERS_JAVA);
  		fProposalAutoActivationSet= triggers.toCharArray();
  		fComparator= new CompletionProposalComparator();
  		fLabelProvider= new JavaScriptElementLabelProvider(JavaScriptElementLabelProvider.SHOW_SMALL_ICONS);
  	}
  
  	public ICompletionProposal[] computeCompletionProposals(ITextViewer viewer, int documentOffset) {
  		Assert.isTrue(false, "ITextViewer not supported"); //$NON-NLS-1$
  		return null;
  	}
  
  	public IContextInformation[] computeContextInformation(ITextViewer viewer, int documentOffset) {
  		Assert.isTrue(false, "ITextViewer not supported"); //$NON-NLS-1$
  		return null;
  	}
  
  	public char[] getCompletionProposalAutoActivationCharacters() {
  		return fProposalAutoActivationSet;
  	}
  
  	public char[] getContextInformationAutoActivationCharacters() {
  		return null;
  	}
  
  	public String getErrorMessage() {
  		return null;
  	}
  
  	public IContextInformationValidator getContextInformationValidator() {
  		return null;
  	}
  
  	public ICompletionProposal[] computeCompletionProposals(IContentAssistSubjectControl contentAssistSubject, int documentOffset) {
  		if (fRoot == null) {
  			return null;
  		}
  
  		String input= contentAssistSubject.getDocument().get();
  		String prefix= input.substring(0, documentOffset);
  
  		ICompletionProposal[] proposals= createSourcePackageFragmentRootProposals(prefix, input.length());
  		Arrays.sort(proposals, fComparator);
  		return proposals;
  	}
  
  	/**
  	 * @param prefix prefixString with thatthe sourcepackagefragmentroots must begin
  	 * @param replacementLength length of the text to replace
  	 * @return array with sourcepackagefragmentroots
  	 */
  	private ICompletionProposal[] createSourcePackageFragmentRootProposals(String prefix, int replacementLength) {
  		List proposals= new ArrayList();
  		try {
  			IJavaScriptProject[] projects= fRoot.getJavaScriptProjects();
  			for (int i= 0; i < projects.length; i++) {
  				IJavaScriptProject project= projects[i];
  				IPackageFragmentRoot[] roots= project.getPackageFragmentRoots();
  				for (int j= 0; j < roots.length; j++) {
  					IPackageFragmentRoot root= roots[j];
  					if (root.exists() && (root.getKind() == IPackageFragmentRoot.K_SOURCE)) {
  						String name= root.getPath().toString();
  						if (name.length() > 1) {
  							name= name.substring(1);
  						}
  						if (name.startsWith(prefix)) {
  							Image image= fLabelProvider.getImage(root);
  							JavaCompletionProposal proposal= new JavaCompletionProposal(name, 0, replacementLength, image,
  								name, 0);
  							proposals.add(proposal);
  						}
  					}
  				}
  			}
  		} catch (JavaScriptModelException e) {
  			// nothing to do
  		}
  
  		return (ICompletionProposal[])proposals.toArray(new ICompletionProposal[proposals.size()]);
  	}
  
  	public IContextInformation[] computeContextInformation(IContentAssistSubjectControl contentAssistSubject, int documentOffset) {
  		return null;
  	}
  
  }
  