/*******************************************************************************
* 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
* Tom Eicher <eclipse@tom.eicher.name> - [content assist] prefix complete casted method proposals - https://bugs.eclipse.org/bugs/show_bug.cgi?id=247547
*******************************************************************************/
package org.eclipse.jdt.internal.ui.text.java;
import org.eclipse.osgi.util.TextProcessor;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Point;
import org.eclipse.core.runtime.Assert;
import org.eclipse.jface.viewers.StyledString;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.ITextViewer;
import org.eclipse.jface.text.contentassist.IContextInformation;
import org.eclipse.jdt.core.CompletionProposal;
import org.eclipse.jdt.core.ICompilationUnit;
import org.eclipse.jdt.core.IJavaProject;
import org.eclipse.jdt.core.JavaCore;
import org.eclipse.jdt.core.Signature;
import org.eclipse.jdt.core.formatter.DefaultCodeFormatterConstants;
import org.eclipse.jdt.ui.text.java.JavaContentAssistInvocationContext;
import org.eclipse.jdt.internal.ui.JavaPlugin;
public class LazyJavaCompletionProposal extends AbstractJavaCompletionProposal {
protected static final String LPAREN= "("; //$NON-NLS-1$
protected static final String RPAREN= ")"; //$NON-NLS-1$
protected static final String COMMA= ","; //$NON-NLS-1$
protected static final String SPACE= " "; //$NON-NLS-1$
protected static final class FormatterPrefs {
/* Methods & constructors */
public final boolean beforeOpeningParen;
public final boolean afterOpeningParen;
public final boolean beforeComma;
public final boolean afterComma;
public final boolean beforeClosingParen;
public final boolean inEmptyList;
/* type parameters */
public final boolean beforeOpeningBracket;
public final boolean afterOpeningBracket;
public final boolean beforeTypeArgumentComma;
public final boolean afterTypeArgumentComma;
public final boolean beforeClosingBracket;
FormatterPrefs(IJavaProject project) {
beforeOpeningParen= getCoreOption(project, DefaultCodeFormatterConstants.FORMATTER_INSERT_SPACE_BEFORE_OPENING_PAREN_IN_METHOD_INVOCATION, false);
afterOpeningParen= getCoreOption(project, DefaultCodeFormatterConstants.FORMATTER_INSERT_SPACE_AFTER_OPENING_PAREN_IN_METHOD_INVOCATION, false);
beforeComma= getCoreOption(project, DefaultCodeFormatterConstants.FORMATTER_INSERT_SPACE_BEFORE_COMMA_IN_METHOD_INVOCATION_ARGUMENTS, false);
afterComma= getCoreOption(project, DefaultCodeFormatterConstants.FORMATTER_INSERT_SPACE_AFTER_COMMA_IN_METHOD_INVOCATION_ARGUMENTS, true);
beforeClosingParen= getCoreOption(project, DefaultCodeFormatterConstants.FORMATTER_INSERT_SPACE_BEFORE_CLOSING_PAREN_IN_METHOD_INVOCATION, false);
inEmptyList= getCoreOption(project, DefaultCodeFormatterConstants.FORMATTER_INSERT_SPACE_BETWEEN_EMPTY_PARENS_IN_METHOD_INVOCATION, false);
beforeOpeningBracket= getCoreOption(project, DefaultCodeFormatterConstants.FORMATTER_INSERT_SPACE_BEFORE_OPENING_ANGLE_BRACKET_IN_PARAMETERIZED_TYPE_REFERENCE, false);
afterOpeningBracket= getCoreOption(project, DefaultCodeFormatterConstants.FORMATTER_INSERT_SPACE_AFTER_OPENING_ANGLE_BRACKET_IN_PARAMETERIZED_TYPE_REFERENCE, false);
beforeTypeArgumentComma= getCoreOption(project, DefaultCodeFormatterConstants.FORMATTER_INSERT_SPACE_BEFORE_COMMA_IN_PARAMETERIZED_TYPE_REFERENCE, false);
afterTypeArgumentComma= getCoreOption(project, DefaultCodeFormatterConstants.FORMATTER_INSERT_SPACE_AFTER_COMMA_IN_PARAMETERIZED_TYPE_REFERENCE, true);
beforeClosingBracket= getCoreOption(project, DefaultCodeFormatterConstants.FORMATTER_INSERT_SPACE_BEFORE_CLOSING_ANGLE_BRACKET_IN_PARAMETERIZED_TYPE_REFERENCE, false);
}
protected final boolean getCoreOption(IJavaProject project, String key, boolean def) {
String option= getCoreOption(project, key);
if (JavaCore.INSERT.equals(option))
return true;
if (JavaCore.DO_NOT_INSERT.equals(option))
return false;
return def;
}
protected final String getCoreOption(IJavaProject project, String key) {
if (project == null)
return JavaCore.getOption(key);
return project.getOption(key, true);
}
}
private boolean fDisplayStringComputed;
private boolean fReplacementStringComputed;
private boolean fReplacementOffsetComputed;
private boolean fReplacementLengthComputed;
private boolean fCursorPositionComputed;
private boolean fImageComputed;
private boolean fContextInformationComputed;
private boolean fProposalInfoComputed;
private boolean fTriggerCharactersComputed;
private boolean fSortStringComputed;
private boolean fRelevanceComputed;
private FormatterPrefs fFormatterPrefs;
/**
* The core proposal wrapped by this completion proposal.
*/
protected final CompletionProposal fProposal;
protected int fContextInformationPosition;
public LazyJavaCompletionProposal(CompletionProposal proposal, JavaContentAssistInvocationContext context) {
super(context);
Assert.isNotNull(proposal);
Assert.isNotNull(context);
Assert.isNotNull(context.getCoreContext());
fProposal= proposal;
}
protected CompletionProposal getProposal() {
return fProposal;
}
/*
* @see ICompletionProposalExtension#getTriggerCharacters()
*/
@Override
public final char[] getTriggerCharacters() {
if (!fTriggerCharactersComputed)
setTriggerCharacters(computeTriggerCharacters());
return super.getTriggerCharacters();
}
protected char[] computeTriggerCharacters() {
return new char[0];
}
/**
* Sets the trigger characters.
* @param triggerCharacters The set of characters which can trigger the application of this completion proposal
*/
@Override
public final void setTriggerCharacters(char[] triggerCharacters) {
fTriggerCharactersComputed= true;
super.setTriggerCharacters(triggerCharacters);
}
/**
* Sets the proposal info.
* @param proposalInfo The additional information associated with this proposal or <code>null</code>
*/
@Override
public final void setProposalInfo(ProposalInfo proposalInfo) {
fProposalInfoComputed= true;
super.setProposalInfo(proposalInfo);
}
/**
* Returns the additional proposal info, or <code>null</code> if none
* exists.
*
* @return the additional proposal info, or <code>null</code> if none
* exists
*/
@Override
protected final ProposalInfo getProposalInfo() {
if (!fProposalInfoComputed)
setProposalInfo(computeProposalInfo());
return super.getProposalInfo();
}
protected ProposalInfo computeProposalInfo() {
return null;
}
/**
* Sets the cursor position relative to the insertion offset. By default this is the length of the completion string
* (Cursor positioned after the completion)
* @param cursorPosition The cursorPosition to set
*/
@Override
public final void setCursorPosition(int cursorPosition) {
fCursorPositionComputed= true;
super.setCursorPosition(cursorPosition);
}
@Override
protected final int getCursorPosition() {
if (!fCursorPositionComputed)
setCursorPosition(computeCursorPosition());
return super.getCursorPosition();
}
protected int computeCursorPosition() {
return getReplacementString().length();
}
/*
* @see org.eclipse.jdt.internal.ui.text.java.AbstractJavaCompletionProposal#isInJavadoc()
*/
@Override
protected final boolean isInJavadoc() {
return fInvocationContext.getCoreContext().isInJavadoc();
}
/*
* @see ICompletionProposal#getContextInformation()
*/
@Override
public final IContextInformation getContextInformation() {
if (!fContextInformationComputed)
setContextInformation(computeContextInformation());
return super.getContextInformation();
}
protected IContextInformation computeContextInformation() {
return null;
}
/**
* Sets the context information.
* @param contextInformation The context information associated with this proposal
*/
@Override
public final void setContextInformation(IContextInformation contextInformation) {
fContextInformationComputed= true;
super.setContextInformation(contextInformation);
}
/*
* @see org.eclipse.jdt.internal.ui.text.java.AbstractJavaCompletionProposal#getStyledDisplayString()
* @since 3.4
*/
@Override
public StyledString getStyledDisplayString() {
if (!fDisplayStringComputed)
setStyledDisplayString(computeDisplayString());
return super.getStyledDisplayString();
}
@Override
public String getDisplayString() {
if (!fDisplayStringComputed)
setStyledDisplayString(computeDisplayString());
return super.getDisplayString();
}
@Override
protected final void setDisplayString(String string) {
fDisplayStringComputed= true;
super.setDisplayString(string);
}
@Override
public void setStyledDisplayString(StyledString text) {
fDisplayStringComputed= true;
super.setStyledDisplayString(text);
}
protected StyledString computeDisplayString() {
return fInvocationContext.getLabelProvider().createStyledLabel(fProposal);
}
/*
* @see ICompletionProposal#getAdditionalProposalInfo()
*/
@Override
public final String getAdditionalProposalInfo() {
return super.getAdditionalProposalInfo();
}
/**
* Gets the replacement offset.
* @return Returns a int
*/
@Override
public final int getReplacementOffset() {
if (!fReplacementOffsetComputed)
setReplacementOffset(fProposal.getReplaceStart());
return super.getReplacementOffset();
}
/**
* Sets the replacement offset.
* @param replacementOffset The replacement offset to set
*/
@Override
public final void setReplacementOffset(int replacementOffset) {
fReplacementOffsetComputed= true;
super.setReplacementOffset(replacementOffset);
}
/*
* @see org.eclipse.jface.text.contentassist.ICompletionProposalExtension3#getCompletionOffset()
*/
@Override
public int getPrefixCompletionStart(IDocument document, int completionOffset) {
return getReplacementOffset();
}
/**
* Gets the replacement length.
* @return Returns a int
*/
@Override
public final int getReplacementLength() {
if (!fReplacementLengthComputed)
setReplacementLength(fProposal.getReplaceEnd() - fProposal.getReplaceStart());
return super.getReplacementLength();
}
/**
* Sets the replacement length.
* @param replacementLength The replacementLength to set
*/
@Override
public final void setReplacementLength(int replacementLength) {
fReplacementLengthComputed= true;
super.setReplacementLength(replacementLength);
}
/**
* Gets the replacement string.
* @return Returns a String
*/
@Override
public final String getReplacementString() {
if (!fReplacementStringComputed)
setReplacementString(computeReplacementString());
return super.getReplacementString();
}
protected String computeReplacementString() {
return String.valueOf(fProposal.getCompletion());
}
/**
* Sets the replacement string.
* @param replacementString The replacement string to set
*/
@Override
public final void setReplacementString(String replacementString) {
fReplacementStringComputed= true;
super.setReplacementString(replacementString);
}
/*
* @see ICompletionProposal#getImage()
*/
@Override
public final Image getImage() {
if (!fImageComputed)
setImage(computeImage());
return super.getImage();
}
protected Image computeImage() {
return JavaPlugin.getImageDescriptorRegistry().get(fInvocationContext.getLabelProvider().createImageDescriptor(fProposal));
}
/**
* Sets the image.
* @param image The image to set
*/
@Override
public final void setImage(Image image) {
fImageComputed= true;
super.setImage(image);
}
/*
* @see org.eclipse.jdt.internal.ui.text.java.AbstractJavaCompletionProposal#isValidPrefix(java.lang.String)
*/
@Override
protected boolean isValidPrefix(String prefix) {
if (super.isValidPrefix(prefix))
return true;
if (fProposal.getKind() == CompletionProposal.METHOD_NAME_REFERENCE) {
// static imports - includes package & type name
StringBuffer buf= new StringBuffer();
buf.append(Signature.toCharArray(fProposal.getDeclarationSignature()));
buf.append('.');
buf.append(TextProcessor.deprocess(getDisplayString()));
return isPrefix(prefix, buf.toString());
}
return false;
}
/**
* Gets the proposal's relevance.
* @return Returns a int
*/
@Override
public final int getRelevance() {
if (!fRelevanceComputed)
setRelevance(computeRelevance());
return super.getRelevance();
}
/**
* Sets the proposal's relevance.
* @param relevance The relevance to set
*/
@Override
public final void setRelevance(int relevance) {
fRelevanceComputed= true;
super.setRelevance(relevance);
}
protected int computeRelevance() {
final int baseRelevance= fProposal.getRelevance() * 16;
switch (fProposal.getKind()) {
case CompletionProposal.PACKAGE_REF:
return baseRelevance + 0;
case CompletionProposal.LABEL_REF:
return baseRelevance + 1;
case CompletionProposal.KEYWORD:
return baseRelevance + 2;
case CompletionProposal.TYPE_REF:
case CompletionProposal.ANONYMOUS_CLASS_DECLARATION:
case CompletionProposal.ANONYMOUS_CLASS_CONSTRUCTOR_INVOCATION:
return baseRelevance + 3;
case CompletionProposal.METHOD_REF:
case CompletionProposal.CONSTRUCTOR_INVOCATION:
case CompletionProposal.METHOD_NAME_REFERENCE:
case CompletionProposal.METHOD_DECLARATION:
case CompletionProposal.ANNOTATION_ATTRIBUTE_REF:
return baseRelevance + 4;
case CompletionProposal.POTENTIAL_METHOD_DECLARATION:
return baseRelevance + 4 /* + 99 */;
case CompletionProposal.FIELD_REF:
return baseRelevance + 5;
case CompletionProposal.LOCAL_VARIABLE_REF:
case CompletionProposal.VARIABLE_DECLARATION:
return baseRelevance + 6;
default:
return baseRelevance;
}
}
@Override
public final String getSortString() {
if (!fSortStringComputed)
setSortString(computeSortString());
return super.getSortString();
}
@Override
protected final void setSortString(String string) {
fSortStringComputed= true;
super.setSortString(string);
}
protected String computeSortString() {
return getDisplayString();
}
protected FormatterPrefs getFormatterPrefs() {
if (fFormatterPrefs == null) {
ICompilationUnit cu= fInvocationContext.getCompilationUnit();
fFormatterPrefs= new FormatterPrefs(cu == null ? null : cu.getJavaProject());
}
return fFormatterPrefs;
}
/**
* Overrides the default context information position. Ignored if set to zero.
*
* @param contextInformationPosition the replaced position.
*/
public void setContextInformationPosition(int contextInformationPosition) {
fContextInformationPosition= contextInformationPosition;
}
/*
* @see org.eclipse.jdt.internal.ui.text.java.AbstractJavaCompletionProposal#apply(org.eclipse.jface.text.ITextViewer, char, int, int)
* @since 3.7
*/
@Override
public void apply(ITextViewer viewer, char trigger, int stateMask, int offset) {
Point selection= viewer.getSelectedRange();
boolean smartToggle= (stateMask & SWT.CTRL) != 0;
if (!(insertCompletion() ^ smartToggle) && selection.y > 0)
fReplacementLengthComputed= false;
super.apply(viewer, trigger, stateMask, offset);
}
/*
* @see org.eclipse.jdt.internal.ui.text.java.AbstractJavaCompletionProposal#selected(org.eclipse.jface.text.ITextViewer, boolean)
* @since 3.7
*/
@Override
public void selected(ITextViewer viewer, boolean smartToggle) {
Point selection= viewer.getSelectedRange();
if (!(insertCompletion() ^ smartToggle) && selection.y > 0)
fReplacementLengthComputed= false;
super.selected(viewer, smartToggle);
}
}