| /******************************************************************************* |
| * 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.HashMap; |
| import java.util.Iterator; |
| |
| import org.eclipse.core.runtime.CoreException; |
| import org.eclipse.core.runtime.Platform; |
| import org.eclipse.jdt.core.ICompilationUnit; |
| import org.eclipse.jface.text.ITextViewer; |
| import org.eclipse.jface.text.Position; |
| import org.eclipse.jface.text.contentassist.ICompletionProposal; |
| import org.eclipse.jface.text.contentassist.IContentAssistProcessor; |
| import org.eclipse.jst.jsp.core.internal.java.IJSPTranslation; |
| import org.eclipse.jst.jsp.core.internal.java.JSPTranslation; |
| import org.eclipse.jst.jsp.core.internal.java.JSPTranslationAdapter; |
| import org.eclipse.jst.jsp.ui.internal.JSPUIMessages; |
| import org.eclipse.jst.jsp.ui.internal.Logger; |
| import org.eclipse.wst.sse.core.StructuredModelManager; |
| import org.eclipse.wst.sse.ui.internal.IReleasable; |
| import org.eclipse.wst.sse.ui.internal.StructuredTextViewer; |
| import org.eclipse.wst.xml.core.internal.provisional.document.IDOMDocument; |
| import org.eclipse.wst.xml.core.internal.provisional.document.IDOMModel; |
| import org.osgi.framework.Bundle; |
| import org.osgi.framework.BundleException; |
| |
| |
| /** |
| * @plannedfor 1.0 |
| */ |
| public class JSPCompletionProcessor implements IContentAssistProcessor, IReleasable { |
| // for debugging |
| private static final boolean DEBUG; |
| static { |
| String value = Platform.getDebugOption("org.eclipse.jst.jsp.core/debug/jsptranslation"); //$NON-NLS-1$ |
| DEBUG = value != null && value.equalsIgnoreCase("true"); //$NON-NLS-1$ |
| } |
| |
| private static final String JDT_CORE_PLUGIN_ID = "org.eclipse.jdt.core"; //$NON-NLS-1$ |
| |
| protected int fJspSourcePosition, fJavaPosition; |
| protected String fErrorMessage = null; |
| protected StructuredTextViewer fViewer = null; |
| private JSPTranslationAdapter fTranslationAdapter = null; |
| |
| /** |
| * Returns a list of completion proposals based on the specified location |
| * within the document that corresponds to the current cursor position |
| * within the text viewer. |
| * |
| * @param viewer |
| * the viewer whose document is used to compute the proposals |
| * @param documentPosition |
| * an offset within the document for which completions should |
| * be computed |
| * @return an array of completion proposals or <code>null</code> if no |
| * proposals are possible |
| */ |
| public ICompletionProposal[] computeCompletionProposals(ITextViewer viewer, int pos) { |
| initialize(pos); |
| |
| JSPProposalCollector collector = null; |
| |
| IDOMModel xmlModel = null; |
| try { |
| if (viewer instanceof StructuredTextViewer) |
| fViewer = (StructuredTextViewer) viewer; |
| |
| xmlModel = (IDOMModel) StructuredModelManager.getModelManager().getExistingModelForRead(fViewer.getDocument()); |
| |
| IDOMDocument xmlDoc = xmlModel.getDocument(); |
| if (fTranslationAdapter == null) |
| fTranslationAdapter = (JSPTranslationAdapter) xmlDoc.getAdapterFor(IJSPTranslation.class); |
| if (fTranslationAdapter != null) { |
| |
| JSPTranslation translation = fTranslationAdapter.getJSPTranslation(); |
| fJavaPosition = translation.getJavaOffset(getDocumentPosition()); |
| |
| if (DEBUG) |
| System.out.println(debug(translation)); |
| |
| try { |
| |
| ICompilationUnit cu = translation.getCompilationUnit(); |
| |
| // can't get java proposals w/out a compilation unit |
| // or without a valid position |
| if (cu == null || -1 == fJavaPosition) |
| return new ICompletionProposal[0]; |
| |
| collector = getProposalCollector(cu, translation); |
| synchronized (cu) { |
| cu.codeComplete(fJavaPosition, collector, null); |
| } |
| } |
| catch (CoreException coreEx) { |
| // a possible Java Model Exception due to not being a Web |
| // (Java) Project |
| coreEx.printStackTrace(); |
| } |
| } |
| } |
| catch (Exception exc) { |
| exc.printStackTrace(); |
| // throw out exceptions on code assist. |
| } |
| finally { |
| if (xmlModel != null) { |
| xmlModel.releaseFromRead(); |
| } |
| } |
| ICompletionProposal[] results = new ICompletionProposal[0]; |
| if(collector != null) { |
| results = collector.getJSPCompletionProposals(); |
| if (results == null || results.length < 1) |
| fErrorMessage = JSPUIMessages.Java_Content_Assist_is_not_UI_; |
| } |
| return results; |
| } |
| |
| protected JSPProposalCollector getProposalCollector(ICompilationUnit cu, JSPTranslation translation) { |
| return new JSPProposalCollector(cu, translation); |
| } |
| |
| /** |
| * For debugging translation mapping only. |
| * |
| * @param translation |
| */ |
| private String debug(JSPTranslation translation) { |
| StringBuffer debugString = new StringBuffer(); |
| HashMap jsp2java = translation.getJsp2JavaMap(); |
| String javaText = translation.getJavaText(); |
| String jspText = fViewer.getDocument().get(); |
| debugString.append("[jsp2JavaMap in JSPCompletionProcessor]\r\n"); //$NON-NLS-1$ |
| debugString.append("jsp cursor position >> " + fViewer.getTextWidget().getCaretOffset() + "\n"); //$NON-NLS-1$ //$NON-NLS-2$ |
| Iterator it = jsp2java.keySet().iterator(); |
| while (it.hasNext()) { |
| try { |
| Position jspPos = (Position) it.next(); |
| Position javaPos = (Position) jsp2java.get(jspPos); |
| debugString.append("jsp > " + jspPos.offset + ":" + jspPos.length + ":" + jspText.substring(jspPos.offset, jspPos.offset + jspPos.length) + ":\n"); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$ |
| debugString.append("java > " + javaPos.offset + ":" + javaPos.length + ":" + javaText.substring(javaPos.offset, javaPos.offset + javaPos.length) + ":\n"); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$ |
| debugString.append("-------------------------------------------------\n"); //$NON-NLS-1$ |
| } |
| catch (Exception e) { |
| // eat exceptions, it's only for debug |
| } |
| } |
| return debugString.toString(); |
| } |
| |
| /** |
| * Returns information about possible contexts based on the specified |
| * location within the document that corresponds to the current cursor |
| * position within the text viewer. |
| * |
| * @param viewer |
| * the viewer whose document is used to compute the possible |
| * contexts |
| * @param documentPosition |
| * an offset within the document for which context information |
| * should be computed |
| * @return an array of context information objects or <code>null</code> |
| * if no context could be found |
| */ |
| public org.eclipse.jface.text.contentassist.IContextInformation[] computeContextInformation(org.eclipse.jface.text.ITextViewer viewer, int documentOffset) { |
| return null; |
| } |
| |
| /** |
| * Returns a string of characters which when pressed should automatically |
| * display content-assist proposals. |
| * |
| * @return string of characters |
| */ |
| public java.lang.String getAutoProposalInvocationCharacters() { |
| return null; |
| } |
| |
| /** |
| * Returns a string of characters which when pressed should automatically |
| * display a content-assist tip. |
| * |
| * @return string of characters |
| */ |
| public java.lang.String getAutoTipInvocationCharacters() { |
| return null; |
| } |
| |
| /** |
| * 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 null; |
| } |
| |
| /** |
| * 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 null; |
| } |
| |
| /** |
| * 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 org.eclipse.jface.text.contentassist.IContextInformationValidator getContextInformationValidator() { |
| return null; |
| } |
| |
| protected int getDocumentPosition() { |
| return fJspSourcePosition; |
| } |
| |
| public String getErrorMessage() { |
| // TODO: get appropriate error message |
| // if (fCollector.getErrorMessage() != null && |
| // fCollector.getErrorMessage().length() > 0) |
| // return fCollector.getErrorMessage(); |
| return fErrorMessage; |
| } |
| |
| /** |
| * Initialize the code assist processor. |
| */ |
| protected void initialize(int pos) { |
| initializeJavaPlugins(); |
| |
| fJspSourcePosition = pos; |
| fErrorMessage = null; |
| } |
| |
| /** |
| * Initialize the Java Plugins that the JSP processor requires. |
| */ |
| protected void initializeJavaPlugins() { |
| try { |
| Bundle bundle = Platform.getBundle(JDT_CORE_PLUGIN_ID); |
| bundle.start(); |
| } |
| catch (BundleException exc) { |
| Logger.logException("Could not initialize the JDT Plugins", exc);//$NON-NLS-1$ |
| } |
| } |
| |
| public void release() { |
| fTranslationAdapter = null; |
| } |
| } |