case-study/jdt-before/ui refactoring/org/eclipse/jdt/internal/ui/refactoring/contentassist/JavaPackageCompletionProcessor.java

   1 /*******************************************************************************
   2  * Copyright (c) 2000, 2011 IBM Corporation and others.
   3  * All rights reserved. This program and the accompanying materials
   4  * are made available under the terms of the Eclipse Public License v1.0
   5  * which accompanies this distribution, and is available at
   6  * http://www.eclipse.org/legal/epl-v10.html
   7  *
   8  * Contributors:
   9  *     IBM Corporation - initial API and implementation
  10  *******************************************************************************/
  11 package org.eclipse.jdt.internal.ui.refactoring.contentassist;
  12
  13 import java.util.ArrayList;
  14 import java.util.Arrays;
  15
  16 import org.eclipse.swt.graphics.Image;
  17
  18 import org.eclipse.core.runtime.Assert;
  19
  20 import org.eclipse.jface.contentassist.IContentAssistSubjectControl;
  21 import org.eclipse.jface.contentassist.ISubjectControlContentAssistProcessor;
  22 import org.eclipse.jface.preference.IPreferenceStore;
  23 import org.eclipse.jface.viewers.ILabelProvider;
  24
  25 import org.eclipse.jface.text.ITextViewer;
  26 import org.eclipse.jface.text.contentassist.ICompletionProposal;
  27 import org.eclipse.jface.text.contentassist.IContentAssistProcessor;
  28 import org.eclipse.jface.text.contentassist.IContextInformation;
  29 import org.eclipse.jface.text.contentassist.IContextInformationValidator;
  30
  31 import org.eclipse.jdt.core.IJavaElement;
  32 import org.eclipse.jdt.core.IPackageFragment;
  33 import org.eclipse.jdt.core.IPackageFragmentRoot;
  34 import org.eclipse.jdt.core.JavaModelException;
  35
  36 import org.eclipse.jdt.ui.JavaElementLabelProvider;
  37 import org.eclipse.jdt.ui.PreferenceConstants;
  38 import org.eclipse.jdt.ui.text.java.CompletionProposalComparator;
  39
  40 import org.eclipse.jdt.internal.ui.JavaPlugin;
  41 import org.eclipse.jdt.internal.ui.text.java.JavaCompletionProposal;
  42
  43 public class JavaPackageCompletionProcessor implements IContentAssistProcessor, ISubjectControlContentAssistProcessor {
  44
  45         private IPackageFragmentRoot fPackageFragmentRoot;
  46         private CompletionProposalComparator fComparator;
  47         private ILabelProvider fLabelProvider;
  48
  49         private char[] fProposalAutoActivationSet;
  50
  51         /**
  52          * Creates a <code>JavaPackageCompletionProcessor</code>.
  53          * The completion context must be set via {@link #setPackageFragmentRoot(IPackageFragmentRoot)}.
  54          */
  55         public JavaPackageCompletionProcessor() {
  56             this(new JavaElementLabelProvider(JavaElementLabelProvider.SHOW_SMALL_ICONS));
  57         }
  58
  59     /**
  60      * Creates a <code>JavaPackageCompletionProcessor</code>.
  61      * The Processor uses the given <code>ILabelProvider</code> to show text and icons for the
  62      * possible completions.
  63      * @param labelProvider Used for the popups.
  64      */
  65         public JavaPackageCompletionProcessor(ILabelProvider labelProvider) {
  66                 fComparator= new CompletionProposalComparator();
  67                 fLabelProvider= labelProvider;
  68
  69                 IPreferenceStore preferenceStore= JavaPlugin.getDefault().getPreferenceStore();
  70                 String triggers= preferenceStore.getString(PreferenceConstants.CODEASSIST_AUTOACTIVATION_TRIGGERS_JAVA);
  71                 fProposalAutoActivationSet = triggers.toCharArray();
  72         }
  73
  74         /* (non-Javadoc)
  75          * @see org.eclipse.jface.text.contentassist.IContentAssistProcessor#computeCompletionProposals(org.eclipse.jface.text.ITextViewer, int)
  76          */
  77         public ICompletionProposal[] computeCompletionProposals(ITextViewer viewer, int documentOffset) {
  78                 Assert.isTrue(false, "ITextViewer not supported"); //$NON-NLS-1$
  79                 return null;
  80         }
  81
  82         /* (non-Javadoc)
  83          * @see org.eclipse.jface.text.contentassist.IContentAssistProcessor#computeContextInformation(org.eclipse.jface.text.ITextViewer, int)
  84          */
  85         public IContextInformation[] computeContextInformation(ITextViewer viewer, int documentOffset) {
  86                 Assert.isTrue(false, "ITextViewer not supported"); //$NON-NLS-1$
  87                 return null;
  88         }
  89
  90         /*
  91          * @see org.eclipse.jface.text.contentassist.IContentAssistProcessor#getCompletionProposalAutoActivationCharacters()
  92          */
  93         public char[] getCompletionProposalAutoActivationCharacters() {
  94                 return fProposalAutoActivationSet;
  95         }
  96
  97         /*
  98          * @see org.eclipse.jface.text.contentassist.IContentAssistProcessor#getContextInformationAutoActivationCharacters()
  99          */
 100         public char[] getContextInformationAutoActivationCharacters() {
 101                 return null;
 102         }
 103
 104         /*
 105          * @see org.eclipse.jface.text.contentassist.IContentAssistProcessor#getErrorMessage()
 106          */
 107         public String getErrorMessage() {
 108                 return null;
 109         }
 110
 111         /*
 112          * @see org.eclipse.jface.text.contentassist.IContentAssistProcessor#getContextInformationValidator()
 113          */
 114         public IContextInformationValidator getContextInformationValidator() {
 115                 return null; //no context
 116         }
 117
 118         /*
 119          * @see ISubjectControlContentAssistProcessor#computeContextInformation(IContentAssistSubjectControl, int)
 120          */
 121         public IContextInformation[] computeContextInformation(IContentAssistSubjectControl contentAssistSubjectControl,
 122                         int documentOffset) {
 123                 return null;
 124         }
 125
 126         /*
 127          * @see ISubjectControlContentAssistProcessor#computeCompletionProposals(IContentAssistSubjectControl, int)
 128          */
 129         public ICompletionProposal[] computeCompletionProposals(IContentAssistSubjectControl contentAssistSubjectControl, int documentOffset) {
 130                 if (fPackageFragmentRoot == null)
 131                         return null;
 132                 String input= contentAssistSubjectControl.getDocument().get();
 133                 ICompletionProposal[] proposals= createPackagesProposals(documentOffset, input);
 134                 Arrays.sort(proposals, fComparator);
 135                 return proposals;
 136         }
 137
 138         public void setPackageFragmentRoot(IPackageFragmentRoot packageFragmentRoot) {
 139                 fPackageFragmentRoot= packageFragmentRoot;
 140         }
 141
 142         private ICompletionProposal[] createPackagesProposals(int documentOffset, String input) {
 143                 ArrayList<JavaCompletionProposal> proposals= new ArrayList<JavaCompletionProposal>();
 144                 String prefix= input.substring(0, documentOffset);
 145                 try {
 146                         IJavaElement[] packageFragments= fPackageFragmentRoot.getChildren();
 147                         for (int i= 0; i < packageFragments.length; i++) {
 148                                 IPackageFragment pack= (IPackageFragment) packageFragments[i];
 149                                 String packName= pack.getElementName();
 150                                 if (packName.length() == 0 || ! packName.startsWith(prefix))
 151                                         continue;
 152                                 Image image= fLabelProvider.getImage(pack);
 153                                 JavaCompletionProposal proposal= new JavaCompletionProposal(packName, 0, input.length(), image, fLabelProvider.getText(pack), 0);
 154                                 proposals.add(proposal);
 155                         }
 156                 } catch (JavaModelException e) {
 157                         //fPackageFragmentRoot is not a proper root -> no proposals
 158                 }
 159                 return proposals.toArray(new ICompletionProposal[proposals.size()]);
 160         }
 161 }