/projects/eclipse_SDK-3.7.1/plugins/org.eclipse.jdt.ui.source_3.7.1.r371_v20110824-0800/org/eclipse/jdt/internal/ui/refactoring/contentassist/CUPositionCompletionProcessor.java
Java | 266 lines | 168 code | 40 blank | 58 comment | 17 complexity | d5012d201138eb0494da2be49a89bc5a MD5 | raw file
- /*******************************************************************************
- * Copyright (c) 2000, 2011 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.jdt.internal.ui.refactoring.contentassist;
- import java.util.ArrayList;
- import java.util.Arrays;
- import java.util.List;
- import org.eclipse.swt.graphics.Image;
- import org.eclipse.core.runtime.Assert;
- import org.eclipse.core.runtime.NullProgressMonitor;
- import org.eclipse.jface.contentassist.IContentAssistSubjectControl;
- import org.eclipse.jface.contentassist.ISubjectControlContentAssistProcessor;
- import org.eclipse.jface.preference.IPreferenceStore;
- import org.eclipse.jface.resource.ImageDescriptor;
- import org.eclipse.jface.viewers.StyledString;
- 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.jdt.core.CompletionRequestor;
- import org.eclipse.jdt.core.ICompilationUnit;
- import org.eclipse.jdt.core.JavaModelException;
- import org.eclipse.jdt.core.WorkingCopyOwner;
- import org.eclipse.jdt.core.compiler.IProblem;
- import org.eclipse.jdt.internal.corext.refactoring.StubTypeContext;
- import org.eclipse.jdt.ui.PreferenceConstants;
- import org.eclipse.jdt.ui.text.java.CompletionProposalComparator;
- import org.eclipse.jdt.internal.ui.JavaPlugin;
- import org.eclipse.jdt.internal.ui.refactoring.RefactoringMessages;
- import org.eclipse.jdt.internal.ui.text.java.JavaCompletionProposal;
- import org.eclipse.jdt.internal.ui.text.java.JavaTypeCompletionProposal;
- import org.eclipse.jdt.internal.ui.viewsupport.ImageDescriptorRegistry;
- public class CUPositionCompletionProcessor implements IContentAssistProcessor, ISubjectControlContentAssistProcessor {
- private static final ImageDescriptorRegistry IMAGE_DESC_REGISTRY= JavaPlugin.getImageDescriptorRegistry();
- private String fErrorMessage;
- private char[] fProposalAutoActivationSet;
- private CompletionProposalComparator fComparator;
- private CompletionContextRequestor fCompletionContextRequestor;
- private CUPositionCompletionRequestor fCompletionRequestor;
- /**
- * Creates a <code>CUPositionCompletionProcessor</code>.
- * The completion context must be set via {@link #setCompletionContext(ICompilationUnit,String,String)}.
- * @param completionRequestor the completion requestor
- */
- public CUPositionCompletionProcessor(CUPositionCompletionRequestor completionRequestor) {
- fCompletionRequestor= completionRequestor;
- fComparator= new CompletionProposalComparator();
- IPreferenceStore preferenceStore= JavaPlugin.getDefault().getPreferenceStore();
- String triggers= preferenceStore.getString(PreferenceConstants.CODEASSIST_AUTOACTIVATION_TRIGGERS_JAVA);
- fProposalAutoActivationSet = triggers.toCharArray();
- }
- /**
- * @param cuHandle the {@link ICompilationUnit} in whose context codeComplete will be invoked.
- * The given cu doesn't have to exist (and if it exists, it will not be modified).
- * An independent working copy consisting of
- * <code>beforeString</code> + ${current_input} + <code>afterString</code> will be used.
- * @param beforeString the string before the input position
- * @param afterString the string after the input position
- */
- public void setCompletionContext(final ICompilationUnit cuHandle, final String beforeString, final String afterString) {
- fCompletionContextRequestor= new CompletionContextRequestor() {
- final StubTypeContext fStubTypeContext= new StubTypeContext(cuHandle, beforeString, afterString);
- @Override
- public StubTypeContext getStubTypeContext() {
- return fStubTypeContext;
- }
- };
- }
- public void setCompletionContextRequestor(CompletionContextRequestor completionContextRequestor) {
- fCompletionContextRequestor= completionContextRequestor;
- }
- /**
- * Computing proposals on a <code>ITextViewer</code> is not supported.
- * @see #computeCompletionProposals(IContentAssistSubjectControl, int)
- * @see IContentAssistProcessor#computeCompletionProposals(ITextViewer, int)
- */
- public ICompletionProposal[] computeCompletionProposals(ITextViewer viewer, int documentOffset) {
- Assert.isTrue(false, "ITextViewer not supported"); //$NON-NLS-1$
- return null;
- }
- /**
- * Computing context information on a <code>ITextViewer</code> is not supported.
- * @see #computeContextInformation(IContentAssistSubjectControl, int)
- * @see IContentAssistProcessor#computeContextInformation(ITextViewer, int)
- */
- public IContextInformation[] computeContextInformation(ITextViewer viewer, int documentOffset) {
- Assert.isTrue(false, "ITextViewer not supported"); //$NON-NLS-1$
- return null;
- }
- /* (non-Javadoc)
- * @see org.eclipse.jface.text.contentassist.IContentAssistProcessor#getCompletionProposalAutoActivationCharacters()
- */
- public char[] getCompletionProposalAutoActivationCharacters() {
- return fProposalAutoActivationSet;
- }
- /* (non-Javadoc)
- * @see org.eclipse.jface.text.contentassist.IContentAssistProcessor#getContextInformationAutoActivationCharacters()
- */
- public char[] getContextInformationAutoActivationCharacters() {
- return null;
- }
- /* (non-Javadoc)
- * @see org.eclipse.jface.text.contentassist.IContentAssistProcessor#getErrorMessage()
- */
- public String getErrorMessage() {
- return fErrorMessage;
- }
- /* (non-Javadoc)
- * @see org.eclipse.jface.text.contentassist.IContentAssistProcessor#getContextInformationValidator()
- */
- public IContextInformationValidator getContextInformationValidator() {
- return null; //no context
- }
- /*
- * @see ISubjectControlContentAssistProcessor#computeContextInformation(IContentAssistSubjectControl, int)
- */
- public IContextInformation[] computeContextInformation(IContentAssistSubjectControl contentAssistSubjectControl, int documentOffset) {
- return null;
- }
- /*
- * @see ISubjectControlContentAssistProcessor#computeCompletionProposals(IContentAssistSubjectControl, int)
- */
- public ICompletionProposal[] computeCompletionProposals(IContentAssistSubjectControl contentAssistSubjectControl, int documentOffset) {
- if (fCompletionContextRequestor.getOriginalCu() == null)
- return null;
- String input= contentAssistSubjectControl.getDocument().get();
- if (documentOffset == 0)
- return null;
- ICompletionProposal[] proposals= internalComputeCompletionProposals(documentOffset, input);
- Arrays.sort(proposals, fComparator);
- return proposals;
- }
- private ICompletionProposal[] internalComputeCompletionProposals(int documentOffset, String input) {
- String cuString= fCompletionContextRequestor.getBeforeString() + input + fCompletionContextRequestor.getAfterString();
- ICompilationUnit cu= null;
- try {
- /*
- * Explicitly create a new non-shared working copy.
- *
- * The WorkingCopy cannot easily be shared between calls, since IContentAssistProcessor
- * has no dispose() lifecycle method. A workaround could be to pass in a WorkingCopyOwner
- * and dispose the owner's working copies from the caller's dispose().
- */
- cu= fCompletionContextRequestor.getOriginalCu().getWorkingCopy(new WorkingCopyOwner() {/*subclass*/}, new NullProgressMonitor());
- cu.getBuffer().setContents(cuString);
- int cuPrefixLength= fCompletionContextRequestor.getBeforeString().length();
- fCompletionRequestor.setOffsetReduction(cuPrefixLength);
- cu.codeComplete(cuPrefixLength + documentOffset, fCompletionRequestor);
- JavaCompletionProposal[] proposals= fCompletionRequestor.getResults();
- if (proposals.length == 0) {
- String errorMsg= fCompletionRequestor.getErrorMessage();
- if (errorMsg == null || errorMsg.trim().length() == 0)
- errorMsg= RefactoringMessages.JavaTypeCompletionProcessor_no_completion;
- fErrorMessage= errorMsg;
- } else {
- fErrorMessage= fCompletionRequestor.getErrorMessage();
- }
- return proposals;
- } catch (JavaModelException e) {
- JavaPlugin.log(e);
- return null;
- } finally {
- try {
- if (cu != null)
- cu.discardWorkingCopy();
- } catch (JavaModelException e) {
- JavaPlugin.log(e);
- }
- }
- }
- protected abstract static class CUPositionCompletionRequestor extends CompletionRequestor {
- public static final char[] TRIGGER_CHARACTERS= new char[] { '.' };
- private int fOffsetReduction;
- private List<JavaCompletionProposal> fProposals;
- private String fErrorMessage2;
- private void setOffsetReduction(int offsetReduction) {
- fOffsetReduction= offsetReduction;
- fProposals= new ArrayList<JavaCompletionProposal>();
- }
- @Override
- public final void completionFailure(IProblem error) {
- fErrorMessage2= error.getMessage();
- }
- public final JavaCompletionProposal[] getResults() {
- return fProposals.toArray(new JavaCompletionProposal[fProposals.size()]);
- }
- public final String getErrorMessage() {
- return fErrorMessage2;
- }
- protected final void addAdjustedCompletion(String name, String completion,
- int start, int end, int relevance, ImageDescriptor descriptor) {
- JavaCompletionProposal javaCompletionProposal= new JavaCompletionProposal(completion, start - fOffsetReduction, end - start,
- getImage(descriptor), new StyledString(name), relevance);
- javaCompletionProposal.setTriggerCharacters(TRIGGER_CHARACTERS);
- fProposals.add(javaCompletionProposal);
- }
- protected final void addAdjustedTypeCompletion(String name, String completion,
- int start, int end, int relevance, ImageDescriptor descriptor, String fullyQualifiedName) {
- String replacementString= fullyQualifiedName == null || completion.length() == 0 ? completion : fullyQualifiedName;
- int replacementOffset= start - fOffsetReduction;
- int replacementLength= end - start;
- JavaTypeCompletionProposal javaCompletionProposal= new JavaTypeCompletionProposal(
- replacementString,
- null,
- replacementOffset,
- replacementLength,
- getImage(descriptor),
- new StyledString(name),
- relevance,
- fullyQualifiedName);
- javaCompletionProposal.setTriggerCharacters(TRIGGER_CHARACTERS);
- fProposals.add(javaCompletionProposal);
- }
- private static Image getImage(ImageDescriptor descriptor) {
- return (descriptor == null) ? null : CUPositionCompletionProcessor.IMAGE_DESC_REGISTRY.get(descriptor);
- }
- }
- }