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.text.javadoc;
  
  
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.List;
  
  import org.eclipse.core.runtime.CoreException;
  import org.eclipse.core.runtime.IConfigurationElement;
  import org.eclipse.core.runtime.IExtensionRegistry;
  import org.eclipse.core.runtime.IProgressMonitor;
  import org.eclipse.core.runtime.Platform;
  import org.eclipse.jface.text.contentassist.IContextInformation;
  import org.eclipse.swt.graphics.Point;
  import org.eclipse.wst.jsdt.core.IJavaScriptUnit;
  import org.eclipse.wst.jsdt.internal.ui.JavaScriptPlugin;
  import org.eclipse.wst.jsdt.ui.JavaScriptUI;
  import org.eclipse.wst.jsdt.ui.text.java.ContentAssistInvocationContext;
  import org.eclipse.wst.jsdt.ui.text.java.IJavaCompletionProposal;
  import org.eclipse.wst.jsdt.ui.text.java.IJavaCompletionProposalComputer;
  import org.eclipse.wst.jsdt.ui.text.java.IJavadocCompletionProcessor;
  import org.eclipse.wst.jsdt.ui.text.java.JavaContentAssistInvocationContext;
  
  /**
   * Java doc completion processor using contributed IJavaDocCompletionProcessor's
   * to evaluate proposals.
   *
   * 
   */
  public class LegacyJavadocCompletionProposalComputer implements IJavaCompletionProposalComputer {
  
  	private static final String PROCESSOR_CONTRIBUTION_ID= "javadocCompletionProcessor"; //$NON-NLS-1$
  
  	private IJavadocCompletionProcessor[] fSubProcessors;
  
  	private String fErrorMessage;
  
  	public LegacyJavadocCompletionProposalComputer() {
  		fSubProcessors= null;
  	}
  
  
  	private IJavadocCompletionProcessor[] getContributedProcessors() {
  		if (fSubProcessors == null) {
  			try {
  				IExtensionRegistry registry= Platform.getExtensionRegistry();
  				IConfigurationElement[] elements=	registry.getConfigurationElementsFor(JavaScriptUI.ID_PLUGIN, PROCESSOR_CONTRIBUTION_ID);
  				IJavadocCompletionProcessor[] result= new IJavadocCompletionProcessor[elements.length];
  				for (int i= 0; i < elements.length; i++) {
  					result[i]= (IJavadocCompletionProcessor) elements[i].createExecutableExtension("class"); //$NON-NLS-1$
  				}
  				fSubProcessors= result;
  			} catch (CoreException e) {
  				JavaScriptPlugin.log(e);
  				fSubProcessors= new IJavadocCompletionProcessor[0];
  			}
  		}
  		return fSubProcessors;
  	}
  
  	/*
  	 * @see org.eclipse.jface.text.contentassist.ICompletionProposalComputer#computeContextInformation(org.eclipse.jface.text.contentassist.TextContentAssistInvocationContext, org.eclipse.core.runtime.IProgressMonitor)
  	 */
  	public List computeContextInformation(ContentAssistInvocationContext context, IProgressMonitor monitor) {
  		if (context instanceof JavaContentAssistInvocationContext) {
  			JavaContentAssistInvocationContext javaContext= (JavaContentAssistInvocationContext) context;
  			
  			IJavaScriptUnit cu= javaContext.getCompilationUnit();
  			int offset= javaContext.getInvocationOffset();
  			
  			ArrayList result= new ArrayList();
  			
  			IJavadocCompletionProcessor[] processors= getContributedProcessors();
  			String error= null;
  			for (int i= 0; i < processors.length; i++) {
  				IJavadocCompletionProcessor curr= processors[i];
  				IContextInformation[] contextInfos= curr.computeContextInformation(cu, offset);
  				if (contextInfos != null) {
  					for (int k= 0; k < contextInfos.length; k++) {
  						result.add(contextInfos[k]);
  					}
  				} else if (error == null) {
  					error= curr.getErrorMessage();
  				}
  			}
  			fErrorMessage= error;
  			return result;
  		}
  		return Collections.EMPTY_LIST;
  	}
  
  	/*
  	 * @see org.eclipse.jface.text.contentassist.ICompletionProposalComputer#computeCompletionProposals(org.eclipse.jface.text.contentassist.TextContentAssistInvocationContext, org.eclipse.core.runtime.IProgressMonitor)
  	 */
  	public List computeCompletionProposals(ContentAssistInvocationContext context, IProgressMonitor monitor) {
  		if (context instanceof JavadocContentAssistInvocationContext) {
  			JavadocContentAssistInvocationContext javaContext= (JavadocContentAssistInvocationContext) context;
  			
  			IJavaScriptUnit cu= javaContext.getCompilationUnit();
  			int offset= javaContext.getInvocationOffset();
  			int length= javaContext.getSelectionLength();
  			Point selection= javaContext.getViewer().getSelectedRange();
  			if (selection.y > 0) {
  				offset= selection.x;
  				length= selection.y;
  			}
  			
  			ArrayList result= new ArrayList();
  			
  			IJavadocCompletionProcessor[] processors= getContributedProcessors();
  			for (int i= 0; i < processors.length; i++) {
  				IJavadocCompletionProcessor curr= processors[i];
  				IJavaCompletionProposal[] proposals= curr.computeCompletionProposals(cu, offset, length, javaContext.getFlags());
  				if (proposals != null) {
  					for (int k= 0; k < proposals.length; k++) {
  						result.add(proposals[k]);
  					}
  				}
  			}
  			return result;
  		}
  		return Collections.EMPTY_LIST;
  	}
  
  
  	/*
  	 * @see org.eclipse.jface.text.contentassist.ICompletionProposalComputer#getErrorMessage()
  	 */
  	public String getErrorMessage() {
  		return fErrorMessage;
  	}
  
  
  	/*
  	 * @see org.eclipse.wst.jsdt.ui.text.java.IJavaCompletionProposalComputer#sessionStarted()
  	 */
  	public void sessionStarted() {
  	}
  
  
  	/*
  	 * @see org.eclipse.wst.jsdt.ui.text.java.IJavaCompletionProposalComputer#sessionEnded()
  	 */
  	public void sessionEnded() {
  		fErrorMessage= null;
  	}
  }
  