bundles/org.eclipse.jst.jsp.ui/src/org/eclipse/jst/jsp/ui/internal/contentassist/JSPJavaContentAssistProcessor.java - sourceediting/webtools.sourceediting - Git at Google

 /*******************************************************************************
  * Copyright (c) 2004 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.jst.jsp.ui.internal.contentassist;

 import java.util.ArrayList;
 import java.util.List;

 import org.eclipse.core.resources.IResource;
 import org.eclipse.jface.text.IDocumentPartitioner;
 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.jst.jsp.core.internal.text.rules.StructuredTextPartitionerForJSP;
 import org.eclipse.wst.sse.core.IndexedRegion;
 import org.eclipse.wst.sse.core.text.IStructuredDocumentRegion;
 import org.eclipse.wst.sse.core.text.ITextRegion;
 import org.eclipse.wst.sse.core.text.ITextRegionContainer;
 import org.eclipse.wst.sse.core.text.ITextRegionList;
 import org.eclipse.wst.sse.ui.IReleasable;
 import org.eclipse.wst.sse.ui.StructuredTextViewer;
 import org.eclipse.wst.sse.ui.contentassist.IResourceDependentProcessor;
 import org.eclipse.wst.sse.ui.internal.SSEUIPlugin;
 import org.eclipse.wst.sse.ui.internal.contentassist.ContentAssistUtils;
 import org.eclipse.wst.sse.ui.internal.contentassist.CustomCompletionProposal;
 import org.eclipse.wst.xml.core.document.XMLNode;
 import org.eclipse.wst.xml.core.jsp.model.parser.temp.XMLJSPRegionContexts;
 import org.eclipse.wst.xml.core.parser.XMLRegionContext;
 import org.eclipse.wst.xml.ui.contentassist.XMLRelevanceConstants;
 import org.eclipse.wst.xml.ui.util.SharedXMLEditorPluginImageHelper;

 public class JSPJavaContentAssistProcessor implements IContentAssistProcessor, IResourceDependentProcessor, IReleasable {
 	protected IResource fResource;
 	protected char completionProposalAutoActivationCharacters[] = new char[]{'.'};
 	protected char contextInformationAutoActivationCharacters[] = null;
 	protected static final String UNKNOWN_CONTEXT = SSEUIPlugin.getResourceString("%Content_Assist_not_availab_UI_"); //$NON-NLS-1$ = "Content Assist not available at the current location "
 	protected String fErrorMessage = null;
 	private JSPCompletionProcessor fJspCompletionProcessor = null;

 	public JSPJavaContentAssistProcessor() {
 		super();
 	}

 	public JSPJavaContentAssistProcessor(IResource file) {
 		super();
 		fResource = file;
 	}

 	public static void main(String[] args) {
 		JSPJavaContentAssistProcessor instance = new JSPJavaContentAssistProcessor();
 		// unit test for 'reverse' function
 		instance._unitTest0();
 		instance._unitTestNormal1();
 		instance._unitTestNormal2();
 		instance._unitTestNormal3();
 		instance._unitTestNormal4();
 		instance._unitTestNormal5();
 	}

 	private void _printList(Object[] list) {
 		for (int i = 0; i < list.length; i++) {
 			System.out.print(list[i] + " "); //$NON-NLS-1$
 		}
 		System.out.println();

 	}

 	private void _unitTest0() {
 		Object[] listOfObjects = new Object[0];
 		_printList(listOfObjects);
 		reverse(listOfObjects);
 		_printList(listOfObjects);
 	}

 	private void _unitTestNormal1() {
 		Object[] listOfObjects = new Object[1];
 		listOfObjects[0] = "one"; //$NON-NLS-1$
 		_printList(listOfObjects);
 		reverse(listOfObjects);
 		_printList(listOfObjects);
 	}

 	private void _unitTestNormal2() {
 		Object[] listOfObjects = new Object[2];
 		listOfObjects[0] = "one"; //$NON-NLS-1$
 		listOfObjects[1] = "two"; //$NON-NLS-1$
 		_printList(listOfObjects);
 		reverse(listOfObjects);
 		_printList(listOfObjects);
 	}

 	private void _unitTestNormal3() {
 		Object[] listOfObjects = new Object[3];
 		listOfObjects[0] = "one"; //$NON-NLS-1$
 		listOfObjects[1] = "two"; //$NON-NLS-1$
 		listOfObjects[2] = "three"; //$NON-NLS-1$
 		_printList(listOfObjects);
 		reverse(listOfObjects);
 		_printList(listOfObjects);
 	}

 	private void _unitTestNormal4() {
 		Object[] listOfObjects = new Object[4];
 		listOfObjects[0] = "one"; //$NON-NLS-1$
 		listOfObjects[1] = "two"; //$NON-NLS-1$
 		listOfObjects[2] = "three"; //$NON-NLS-1$
 		listOfObjects[3] = "four"; //$NON-NLS-1$
 		_printList(listOfObjects);
 		reverse(listOfObjects);
 		_printList(listOfObjects);
 	}

 	private void _unitTestNormal5() {
 		Object[] listOfObjects = new Object[5];
 		listOfObjects[0] = "one"; //$NON-NLS-1$
 		listOfObjects[1] = "two"; //$NON-NLS-1$
 		listOfObjects[2] = "three"; //$NON-NLS-1$
 		listOfObjects[3] = "four"; //$NON-NLS-1$
 		listOfObjects[4] = "five"; //$NON-NLS-1$
 		_printList(listOfObjects);
 		reverse(listOfObjects);
 		_printList(listOfObjects);
 	}

 	/**
 	 * Return a list of proposed code completions based on the
 	 * specified location within the document that corresponds
 	 * to the current cursor position within the text-editor control.
 	 *
 	 * @param documentPosition a location within the document
 	 * @return an array of code-assist items
 	 */
 	public ICompletionProposal[] computeCompletionProposals(ITextViewer viewer, int documentPosition) {

 		IndexedRegion treeNode = ContentAssistUtils.getNodeAt((StructuredTextViewer) viewer, documentPosition);

 		// get results from JSP completion processor
 		fJspCompletionProcessor = getJspCompletionProcessor();
 		ICompletionProposal[] results = fJspCompletionProcessor.computeCompletionProposals(viewer, documentPosition);
 		fErrorMessage = fJspCompletionProcessor.getErrorMessage();
 		if (results.length == 0 && (fErrorMessage == null || fErrorMessage.length() == 0)) {
 			fErrorMessage = UNKNOWN_CONTEXT;
 		}

 		XMLNode xNode = null;
 		IStructuredDocumentRegion flat = null;
 		if (treeNode instanceof XMLNode) {
 			xNode = (XMLNode) treeNode;
 			flat = xNode.getFirstStructuredDocumentRegion();
 			if (flat != null && flat.getType() == XMLJSPRegionContexts.JSP_CONTENT) {
 				flat = flat.getPrevious();
 			}
 		}

 		// this is in case it's a <%@, it will be a region container...
 		ITextRegion openRegion = null;
 		if (flat != null && flat instanceof ITextRegionContainer) {
 			ITextRegionList v = ((ITextRegionContainer) flat).getRegions();
 			if (v.size() > 0)
 				openRegion = v.get(0);
 		}

 		// ADD CDATA PROPOSAL IF IT'S AN XML-JSP TAG
 		if (flat != null && flat.getType() != XMLJSPRegionContexts.JSP_SCRIPTLET_OPEN && flat.getType() != XMLJSPRegionContexts.JSP_DECLARATION_OPEN && flat.getType() != XMLJSPRegionContexts.JSP_EXPRESSION_OPEN && flat.getType() != XMLRegionContext.BLOCK_TEXT && (openRegion != null && openRegion.getType() != XMLJSPRegionContexts.JSP_DIRECTIVE_OPEN) && !inAttributeRegion(flat, documentPosition)) {

 			// determine if cursor is before or after selected range
 			int adjustedDocPosition = documentPosition;
 			int realCaretPosition = viewer.getTextWidget().getCaretOffset();
 			int selectionLength = viewer.getSelectedRange().y;
 			if (documentPosition > realCaretPosition) {
 				adjustedDocPosition -= selectionLength;
 			}

 			CustomCompletionProposal cdataProposal = createCDATAProposal(adjustedDocPosition, selectionLength);
 			ICompletionProposal[] newResults = new ICompletionProposal[results.length + 1];
 			System.arraycopy(results, 0, newResults, 0, results.length);
 			newResults[results.length] = cdataProposal;
 			results = newResults;
 		}

 		// (pa) ** this is code in progress...
 		// add ending %> proposal for non closed JSP tags
 		//		String tagText = flat.getText();
 		//		// TODO need a much better compare (using constants?)
 		//		if(tagText.equals("<%") || tagText.equals("<%=") || tagText.equals("<%!"));
 		//		{
 		//			ICompletionProposal testah = ContentAssistUtils.computeJSPEndTagProposal(viewer,documentPosition, treeNode, "<%" , SharedXMLEditorPluginImageHelper.IMG_OBJ_TAG_GENERIC);
 		//			if(testah != null)
 		//			{
 		//				ICompletionProposal[] newResults = new ICompletionProposal[results.length + 1];
 		//				System.arraycopy( results, 0, newResults, 0, results.length);
 		//				newResults[results.length] = testah;
 		//				results = newResults;
 		//			}
 		//		}

 		reverse(results); // so variables show up first
 		return results;
 	}

 	// reverses an array of objects
 	public void reverse(Object[] array) {
 		Object temp = null;
 		//DMW: 8/16/2002 this was <=, but was thrown out of bounds occasionally
 		for (int i = 0; i < (array.length / 2); i++) {
 			temp = array[i];
 			array[i] = array[(array.length - 1) - i];
 			array[(array.length - 1) - i] = temp;
 		}
 	}

 	private CustomCompletionProposal createCDATAProposal(int adjustedDocPosition, int selectionLength) {
 		return new CustomCompletionProposal("<![CDATA[]]>", //$NON-NLS-1$
 					adjustedDocPosition, selectionLength, // should be the selection length
 					9, SharedXMLEditorPluginImageHelper.getImage(SharedXMLEditorPluginImageHelper.IMG_OBJ_CDATASECTION),
 					"CDATA Section", //$NON-NLS-1$
 					null, null, XMLRelevanceConstants.R_CDATA);
 	}

 	private boolean inAttributeRegion(IStructuredDocumentRegion flat, int documentPosition) {
 		ITextRegion attrContainer = flat.getRegionAtCharacterOffset(documentPosition);
 		if (attrContainer != null && attrContainer instanceof ITextRegionContainer) {
 			if (attrContainer.getType() == XMLRegionContext.XML_TAG_ATTRIBUTE_VALUE) {
 				return true;
 			}
 		}
 		return false;
 	}

 	/**
 	 * Returns the characters which when entered by the user should
 	 * automatically trigger the presentation of possible completions.
 	 *
 	 * @return the auto activation characters for completion proposal or <code>null</code>
 	 *		if no auto activation is desired
 	 */
 	public char[] getCompletionProposalAutoActivationCharacters() {
 		return completionProposalAutoActivationCharacters;
 	}

 	/**
 	 * Returns the characters which when entered by the user should
 	 * automatically trigger the presentation of context information.
 	 *
 	 * @return the auto activation characters for presenting context information
 	 *		or <code>null</code> if no auto activation is desired
 	 */
 	public char[] getContextInformationAutoActivationCharacters() {
 		return contextInformationAutoActivationCharacters;
 	}

 	/**
 	 * Return the reason why computeProposals was not able to find any completions.
 	 *
 	 * @return an error message
 	 *   or null if no error occurred
 	 */
 	public String getErrorMessage() {
 		return fErrorMessage;
 	}

 	/**
 	 * @see ContentAssistAdapter#release()
 	 */
 	public void release() {
 		if (fJspCompletionProcessor != null) {
 			fJspCompletionProcessor.release();
 			fJspCompletionProcessor = null;
 		}
 		fResource = null;
 	}

 	/**
 	 * @see ContentAssistAdapter#initialize(IResource)
 	 */
 	public void initialize(IResource resource) {
 		fResource = resource;
 		getJspCompletionProcessor().initialize(resource);
 	}

 	/**
 	 *
 	 */
 	private JSPCompletionProcessor getJspCompletionProcessor() {
 		if (fJspCompletionProcessor == null) {
 			fJspCompletionProcessor = new JSPCompletionProcessor(fResource);
 			fJspCompletionProcessor.initialize(fResource);
 		}
 		return fJspCompletionProcessor;
 	}

 	/**
 	 * @see org.eclipse.jface.text.contentassist.IContentAssistProcessor#computeContextInformation(org.eclipse.jface.text.ITextViewer, int)
 	 */
 	public IContextInformation[] computeContextInformation(ITextViewer viewer, int documentOffset) {
 		List results = new ArrayList();
 		// need to compute context info here, if it's JSP, call java computer
 		IDocumentPartitioner dp = viewer.getDocument().getDocumentPartitioner();
 		String type = dp.getPartition(documentOffset).getType();
 		if (type == StructuredTextPartitionerForJSP.ST_DEFAULT_JSP || type == StructuredTextPartitionerForJSP.ST_JSP_CONTENT_JAVA) {
 			// get context info from completion results...
 			ICompletionProposal[] proposals = computeCompletionProposals(viewer, documentOffset);
 			for (int i = 0; i < proposals.length; i++) {
 				IContextInformation ci = proposals[i].getContextInformation();
 				if (ci != null)
 					results.add(ci);
 			}
 		}
 		return (IContextInformation[]) results.toArray(new IContextInformation[results.size()]);
 	}

 	/**
 	 * Returns a validator used to determine when displayed context information
 	 * should be dismissed. May only return <code>null</code> if the processor is
 	 * incapable of computing context information.
 	 *
 	 * @return a context information validator, or <code>null</code> if the processor
 	 * 			is incapable of computing context information
 	 */
 	public IContextInformationValidator getContextInformationValidator() {
 		return new JavaParameterListValidator();
 	}
 }
	/*******************************************************************************
	* Copyright (c) 2004 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.jst.jsp.ui.internal.contentassist;

	import java.util.ArrayList;
	import java.util.List;

	import org.eclipse.core.resources.IResource;
	import org.eclipse.jface.text.IDocumentPartitioner;
	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.jst.jsp.core.internal.text.rules.StructuredTextPartitionerForJSP;
	import org.eclipse.wst.sse.core.IndexedRegion;
	import org.eclipse.wst.sse.core.text.IStructuredDocumentRegion;
	import org.eclipse.wst.sse.core.text.ITextRegion;
	import org.eclipse.wst.sse.core.text.ITextRegionContainer;
	import org.eclipse.wst.sse.core.text.ITextRegionList;
	import org.eclipse.wst.sse.ui.IReleasable;
	import org.eclipse.wst.sse.ui.StructuredTextViewer;
	import org.eclipse.wst.sse.ui.contentassist.IResourceDependentProcessor;
	import org.eclipse.wst.sse.ui.internal.SSEUIPlugin;
	import org.eclipse.wst.sse.ui.internal.contentassist.ContentAssistUtils;
	import org.eclipse.wst.sse.ui.internal.contentassist.CustomCompletionProposal;
	import org.eclipse.wst.xml.core.document.XMLNode;
	import org.eclipse.wst.xml.core.jsp.model.parser.temp.XMLJSPRegionContexts;
	import org.eclipse.wst.xml.core.parser.XMLRegionContext;
	import org.eclipse.wst.xml.ui.contentassist.XMLRelevanceConstants;
	import org.eclipse.wst.xml.ui.util.SharedXMLEditorPluginImageHelper;

	public class JSPJavaContentAssistProcessor implements IContentAssistProcessor, IResourceDependentProcessor, IReleasable {
	protected IResource fResource;
	protected char completionProposalAutoActivationCharacters[] = new char[]{'.'};
	protected char contextInformationAutoActivationCharacters[] = null;
	protected static final String UNKNOWN_CONTEXT = SSEUIPlugin.getResourceString("%Content_Assist_not_availab_UI_"); //$NON-NLS-1$ = "Content Assist not available at the current location "
	protected String fErrorMessage = null;
	private JSPCompletionProcessor fJspCompletionProcessor = null;

	public JSPJavaContentAssistProcessor() {
	super();
	}

	public JSPJavaContentAssistProcessor(IResource file) {
	super();
	fResource = file;
	}

	public static void main(String[] args) {
	JSPJavaContentAssistProcessor instance = new JSPJavaContentAssistProcessor();
	// unit test for 'reverse' function
	instance._unitTest0();
	instance._unitTestNormal1();
	instance._unitTestNormal2();
	instance._unitTestNormal3();
	instance._unitTestNormal4();
	instance._unitTestNormal5();
	}

	private void _printList(Object[] list) {
	for (int i = 0; i < list.length; i++) {
	System.out.print(list[i] + " "); //$NON-NLS-1$
	}
	System.out.println();

	}

	private void _unitTest0() {
	Object[] listOfObjects = new Object[0];
	_printList(listOfObjects);
	reverse(listOfObjects);
	_printList(listOfObjects);
	}

	private void _unitTestNormal1() {
	Object[] listOfObjects = new Object[1];
	listOfObjects[0] = "one"; //$NON-NLS-1$
	_printList(listOfObjects);
	reverse(listOfObjects);
	_printList(listOfObjects);
	}

	private void _unitTestNormal2() {
	Object[] listOfObjects = new Object[2];
	listOfObjects[0] = "one"; //$NON-NLS-1$
	listOfObjects[1] = "two"; //$NON-NLS-1$
	_printList(listOfObjects);
	reverse(listOfObjects);
	_printList(listOfObjects);
	}

	private void _unitTestNormal3() {
	Object[] listOfObjects = new Object[3];
	listOfObjects[0] = "one"; //$NON-NLS-1$
	listOfObjects[1] = "two"; //$NON-NLS-1$
	listOfObjects[2] = "three"; //$NON-NLS-1$
	_printList(listOfObjects);
	reverse(listOfObjects);
	_printList(listOfObjects);
	}

	private void _unitTestNormal4() {
	Object[] listOfObjects = new Object[4];
	listOfObjects[0] = "one"; //$NON-NLS-1$
	listOfObjects[1] = "two"; //$NON-NLS-1$
	listOfObjects[2] = "three"; //$NON-NLS-1$
	listOfObjects[3] = "four"; //$NON-NLS-1$
	_printList(listOfObjects);
	reverse(listOfObjects);
	_printList(listOfObjects);
	}

	private void _unitTestNormal5() {
	Object[] listOfObjects = new Object[5];
	listOfObjects[0] = "one"; //$NON-NLS-1$
	listOfObjects[1] = "two"; //$NON-NLS-1$
	listOfObjects[2] = "three"; //$NON-NLS-1$
	listOfObjects[3] = "four"; //$NON-NLS-1$
	listOfObjects[4] = "five"; //$NON-NLS-1$
	_printList(listOfObjects);
	reverse(listOfObjects);
	_printList(listOfObjects);
	}

	/**
	* Return a list of proposed code completions based on the
	* specified location within the document that corresponds
	* to the current cursor position within the text-editor control.
	*
	* @param documentPosition a location within the document
	* @return an array of code-assist items
	*/
	public ICompletionProposal[] computeCompletionProposals(ITextViewer viewer, int documentPosition) {

	IndexedRegion treeNode = ContentAssistUtils.getNodeAt((StructuredTextViewer) viewer, documentPosition);

	// get results from JSP completion processor
	fJspCompletionProcessor = getJspCompletionProcessor();
	ICompletionProposal[] results = fJspCompletionProcessor.computeCompletionProposals(viewer, documentPosition);
	fErrorMessage = fJspCompletionProcessor.getErrorMessage();
	if (results.length == 0 && (fErrorMessage == null \|\| fErrorMessage.length() == 0)) {
	fErrorMessage = UNKNOWN_CONTEXT;
	}

	XMLNode xNode = null;
	IStructuredDocumentRegion flat = null;
	if (treeNode instanceof XMLNode) {
	xNode = (XMLNode) treeNode;
	flat = xNode.getFirstStructuredDocumentRegion();
	if (flat != null && flat.getType() == XMLJSPRegionContexts.JSP_CONTENT) {
	flat = flat.getPrevious();
	}
	}

	// this is in case it's a <%@, it will be a region container...
	ITextRegion openRegion = null;
	if (flat != null && flat instanceof ITextRegionContainer) {
	ITextRegionList v = ((ITextRegionContainer) flat).getRegions();
	if (v.size() > 0)
	openRegion = v.get(0);
	}

	// ADD CDATA PROPOSAL IF IT'S AN XML-JSP TAG
	if (flat != null && flat.getType() != XMLJSPRegionContexts.JSP_SCRIPTLET_OPEN && flat.getType() != XMLJSPRegionContexts.JSP_DECLARATION_OPEN && flat.getType() != XMLJSPRegionContexts.JSP_EXPRESSION_OPEN && flat.getType() != XMLRegionContext.BLOCK_TEXT && (openRegion != null && openRegion.getType() != XMLJSPRegionContexts.JSP_DIRECTIVE_OPEN) && !inAttributeRegion(flat, documentPosition)) {

	// determine if cursor is before or after selected range
	int adjustedDocPosition = documentPosition;
	int realCaretPosition = viewer.getTextWidget().getCaretOffset();
	int selectionLength = viewer.getSelectedRange().y;
	if (documentPosition > realCaretPosition) {
	adjustedDocPosition -= selectionLength;
	}

	CustomCompletionProposal cdataProposal = createCDATAProposal(adjustedDocPosition, selectionLength);
	ICompletionProposal[] newResults = new ICompletionProposal[results.length + 1];
	System.arraycopy(results, 0, newResults, 0, results.length);
	newResults[results.length] = cdataProposal;
	results = newResults;
	}

	// (pa) ** this is code in progress...
	// add ending %> proposal for non closed JSP tags
	// String tagText = flat.getText();
	// // TODO need a much better compare (using constants?)
	// if(tagText.equals("<%") \|\| tagText.equals("<%=") \|\| tagText.equals("<%!"));
	// {
	// ICompletionProposal testah = ContentAssistUtils.computeJSPEndTagProposal(viewer,documentPosition, treeNode, "<%" , SharedXMLEditorPluginImageHelper.IMG_OBJ_TAG_GENERIC);
	// if(testah != null)
	// {
	// ICompletionProposal[] newResults = new ICompletionProposal[results.length + 1];
	// System.arraycopy( results, 0, newResults, 0, results.length);
	// newResults[results.length] = testah;
	// results = newResults;
	// }
	// }

	reverse(results); // so variables show up first
	return results;
	}

	// reverses an array of objects
	public void reverse(Object[] array) {
	Object temp = null;
	//DMW: 8/16/2002 this was <=, but was thrown out of bounds occasionally
	for (int i = 0; i < (array.length / 2); i++) {
	temp = array[i];
	array[i] = array[(array.length - 1) - i];
	array[(array.length - 1) - i] = temp;
	}
	}

	private CustomCompletionProposal createCDATAProposal(int adjustedDocPosition, int selectionLength) {
	return new CustomCompletionProposal("<![CDATA[]]>", //$NON-NLS-1$
	adjustedDocPosition, selectionLength, // should be the selection length
	9, SharedXMLEditorPluginImageHelper.getImage(SharedXMLEditorPluginImageHelper.IMG_OBJ_CDATASECTION),
	"CDATA Section", //$NON-NLS-1$
	null, null, XMLRelevanceConstants.R_CDATA);
	}

	private boolean inAttributeRegion(IStructuredDocumentRegion flat, int documentPosition) {
	ITextRegion attrContainer = flat.getRegionAtCharacterOffset(documentPosition);
	if (attrContainer != null && attrContainer instanceof ITextRegionContainer) {
	if (attrContainer.getType() == XMLRegionContext.XML_TAG_ATTRIBUTE_VALUE) {
	return true;
	}
	}
	return false;
	}

	/**
	* Returns the characters which when entered by the user should
	* automatically trigger the presentation of possible completions.
	*
	* @return the auto activation characters for completion proposal or <code>null</code>
	* if no auto activation is desired
	*/
	public char[] getCompletionProposalAutoActivationCharacters() {
	return completionProposalAutoActivationCharacters;
	}

	/**
	* Returns the characters which when entered by the user should
	* automatically trigger the presentation of context information.
	*
	* @return the auto activation characters for presenting context information
	* or <code>null</code> if no auto activation is desired
	*/
	public char[] getContextInformationAutoActivationCharacters() {
	return contextInformationAutoActivationCharacters;
	}

	/**
	* Return the reason why computeProposals was not able to find any completions.
	*
	* @return an error message
	* or null if no error occurred
	*/
	public String getErrorMessage() {
	return fErrorMessage;
	}

	/**
	* @see ContentAssistAdapter#release()
	*/
	public void release() {
	if (fJspCompletionProcessor != null) {
	fJspCompletionProcessor.release();
	fJspCompletionProcessor = null;
	}
	fResource = null;
	}

	/**
	* @see ContentAssistAdapter#initialize(IResource)
	*/
	public void initialize(IResource resource) {
	fResource = resource;
	getJspCompletionProcessor().initialize(resource);
	}

	/**
	*
	*/
	private JSPCompletionProcessor getJspCompletionProcessor() {
	if (fJspCompletionProcessor == null) {
	fJspCompletionProcessor = new JSPCompletionProcessor(fResource);
	fJspCompletionProcessor.initialize(fResource);
	}
	return fJspCompletionProcessor;
	}

	/**
	* @see org.eclipse.jface.text.contentassist.IContentAssistProcessor#computeContextInformation(org.eclipse.jface.text.ITextViewer, int)
	*/
	public IContextInformation[] computeContextInformation(ITextViewer viewer, int documentOffset) {
	List results = new ArrayList();
	// need to compute context info here, if it's JSP, call java computer
	IDocumentPartitioner dp = viewer.getDocument().getDocumentPartitioner();
	String type = dp.getPartition(documentOffset).getType();
	if (type == StructuredTextPartitionerForJSP.ST_DEFAULT_JSP \|\| type == StructuredTextPartitionerForJSP.ST_JSP_CONTENT_JAVA) {
	// get context info from completion results...
	ICompletionProposal[] proposals = computeCompletionProposals(viewer, documentOffset);
	for (int i = 0; i < proposals.length; i++) {
	IContextInformation ci = proposals[i].getContextInformation();
	if (ci != null)
	results.add(ci);
	}
	}
	return (IContextInformation[]) results.toArray(new IContextInformation[results.size()]);
	}

	/**
	* Returns a validator used to determine when displayed context information
	* should be dismissed. May only return <code>null</code> if the processor is
	* incapable of computing context information.
	*
	* @return a context information validator, or <code>null</code> if the processor
	* is incapable of computing context information
	*/
	public IContextInformationValidator getContextInformationValidator() {
	return new JavaParameterListValidator();
	}
	}