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/*******************************************************************************
* 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.wst.jsdt.internal.ui.text.java;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.jface.dialogs.ErrorDialog;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.text.ITextViewer;
import org.eclipse.jface.text.contentassist.ICompletionProposal;
import org.eclipse.jface.text.contentassist.IContextInformation;
import org.eclipse.jface.text.contentassist.IContextInformationExtension;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.wst.jsdt.core.CompletionProposal;
import org.eclipse.wst.jsdt.core.IJavaScriptUnit;
import org.eclipse.wst.jsdt.core.JavaScriptModelException;
import org.eclipse.wst.jsdt.ui.PreferenceConstants;
import org.eclipse.wst.jsdt.ui.text.java.CompletionProposalCollector;
import org.eclipse.wst.jsdt.ui.text.java.ContentAssistInvocationContext;
import org.eclipse.wst.jsdt.ui.text.java.IJavaCompletionProposalComputer;
import org.eclipse.wst.jsdt.ui.text.java.JavaContentAssistInvocationContext;
/**
* Computes Java completion proposals and context infos.
*
*
*/
public class JavaCompletionProposalComputer implements IJavaCompletionProposalComputer {
private static final class ContextInformationWrapper implements IContextInformation, IContextInformationExtension {
private final IContextInformation fContextInformation;
private int fPosition;
public ContextInformationWrapper(IContextInformation contextInformation) {
fContextInformation= contextInformation;
}
/*
* @see IContextInformation#getContextDisplayString()
*/
public String getContextDisplayString() {
return fContextInformation.getContextDisplayString();
}
/*
* @see IContextInformation#getImage()
*/
public Image getImage() {
return fContextInformation.getImage();
}
/*
* @see IContextInformation#getInformationDisplayString()
*/
public String getInformationDisplayString() {
return fContextInformation.getInformationDisplayString();
}
/*
* @see IContextInformationExtension#getContextInformationPosition()
*/
public int getContextInformationPosition() {
return fPosition;
}
public void setContextInformationPosition(int position) {
fPosition= position;
}
/*
* @see org.eclipse.jface.text.contentassist.IContextInformation#equals(java.lang.Object)
*/
public boolean equals(Object object) {
if (object instanceof ContextInformationWrapper)
return fContextInformation.equals(((ContextInformationWrapper) object).fContextInformation);
else
return fContextInformation.equals(object);
}
}
private String fErrorMessage;
public JavaCompletionProposalComputer() {
}
protected int guessContextInformationPosition(ContentAssistInvocationContext context) {
return context.getInvocationOffset();
}
private List addContextInformations(JavaContentAssistInvocationContext context, int offset, IProgressMonitor monitor) {
List proposals= internalComputeCompletionProposals(offset, context, monitor);
List result= new ArrayList(proposals.size());
for (Iterator it= proposals.iterator(); it.hasNext();) {
ICompletionProposal proposal= (ICompletionProposal) it.next();
IContextInformation contextInformation= proposal.getContextInformation();
if (contextInformation != null) {
ContextInformationWrapper wrapper= new ContextInformationWrapper(contextInformation);
wrapper.setContextInformationPosition(offset);
result.add(wrapper);
}
}
return result;
}
/*
* @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;
int contextInformationPosition= guessContextInformationPosition(javaContext);
List result= addContextInformations(javaContext, contextInformationPosition, monitor);
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 JavaContentAssistInvocationContext) {
JavaContentAssistInvocationContext javaContext= (JavaContentAssistInvocationContext) context;
return internalComputeCompletionProposals(context.getInvocationOffset(), javaContext, monitor);
}
return Collections.EMPTY_LIST;
}
private List internalComputeCompletionProposals(int offset, JavaContentAssistInvocationContext context, IProgressMonitor monitor) {
IJavaScriptUnit unit= context.getCompilationUnit();
if (unit == null)
return Collections.EMPTY_LIST;
ITextViewer viewer= context.getViewer();
CompletionProposalCollector collector= createCollector(context);
collector.setInvocationContext(context);
// Allow completions for unresolved types - since 3.3
collector.setAllowsRequiredProposals(CompletionProposal.FIELD_REF, CompletionProposal.TYPE_REF, true);
collector.setAllowsRequiredProposals(CompletionProposal.FIELD_REF, CompletionProposal.TYPE_IMPORT, true);
collector.setAllowsRequiredProposals(CompletionProposal.FIELD_REF, CompletionProposal.FIELD_IMPORT, true);
collector.setAllowsRequiredProposals(CompletionProposal.METHOD_REF, CompletionProposal.TYPE_REF, true);
collector.setAllowsRequiredProposals(CompletionProposal.METHOD_REF, CompletionProposal.TYPE_IMPORT, true);
collector.setAllowsRequiredProposals(CompletionProposal.METHOD_REF, CompletionProposal.METHOD_IMPORT, true);
collector.setAllowsRequiredProposals(CompletionProposal.CONSTRUCTOR_INVOCATION, CompletionProposal.TYPE_REF, true);
// Set the favorite list to propose static members - since 3.3
collector.setFavoriteReferences(getFavoriteStaticMembers());
try {
Point selection= viewer.getSelectedRange();
if (selection.y > 0)
collector.setReplacementLength(selection.y);
unit.codeComplete(offset, collector);
} catch (JavaScriptModelException x) {
Shell shell= viewer.getTextWidget().getShell();
if (x.isDoesNotExist() && !unit.getJavaScriptProject().isOnIncludepath(unit))
MessageDialog.openInformation(shell, JavaTextMessages.CompletionProcessor_error_notOnBuildPath_title, JavaTextMessages.CompletionProcessor_error_notOnBuildPath_message);
else
ErrorDialog.openError(shell, JavaTextMessages.CompletionProcessor_error_accessing_title, JavaTextMessages.CompletionProcessor_error_accessing_message, x.getStatus());
}
ICompletionProposal[] javaProposals= collector.getJavaCompletionProposals();
int contextInformationOffset= guessContextInformationPosition(context);
if (contextInformationOffset != offset) {
for (int i= 0; i < javaProposals.length; i++) {
if (javaProposals[i] instanceof JavaMethodCompletionProposal) {
JavaMethodCompletionProposal jmcp= (JavaMethodCompletionProposal) javaProposals[i];
jmcp.setContextInformationPosition(contextInformationOffset);
}
}
}
List proposals= new ArrayList(Arrays.asList(javaProposals));
if (proposals.size() == 0) {
String error= collector.getErrorMessage();
if (error.length() > 0)
fErrorMessage= error;
}
return proposals;
}
/**
* Returns the array with favorite static members.
*
* @return the <code>String</code> array with with favorite static members
* @see org.eclipse.wst.jsdt.core.CompletionRequestor#setFavoriteReferences(String[])
*
*/
private String[] getFavoriteStaticMembers() {
String serializedFavorites= PreferenceConstants.getPreferenceStore().getString(PreferenceConstants.CODEASSIST_FAVORITE_STATIC_MEMBERS);
if (serializedFavorites != null && serializedFavorites.length() > 0)
return serializedFavorites.split(";"); //$NON-NLS-1$
return new String[0];
}
/**
* Creates the collector used to get proposals from core.
*/
protected CompletionProposalCollector createCollector(JavaContentAssistInvocationContext context) {
CompletionProposalCollector collector = new CompletionProposalCollector(context.getCompilationUnit());
collector.setInvocationContext(context);
return collector;
}
/*
* @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;
}
}
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