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/*******************************************************************************
* Copyright (c) 2016 Red Hat Inc. 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:
* - Mickael Istria (Red Hat Inc.)
*******************************************************************************/
package org.eclipse.ui.internal.genericeditor;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
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;
/**
* A content assist processor that delegates all content assist
* operations to children provided in constructor and aggregates
* the results.
*
* @since 1.0
*/
public class CompositeContentAssistProcessor implements IContentAssistProcessor {
private List<IContentAssistProcessor> fContentAssistProcessors;
/**
* Constructor
* @param contentAssistProcessors the children that will actually populate the output
* of this content assist processor.
*/
public CompositeContentAssistProcessor(List<IContentAssistProcessor> contentAssistProcessors) {
fContentAssistProcessors= contentAssistProcessors;
}
@Override
public ICompletionProposal[] computeCompletionProposals(ITextViewer viewer, int offset) {
List<ICompletionProposal> res = new ArrayList<>();
for (IContentAssistProcessor processor : this.fContentAssistProcessors) {
res.addAll(Arrays.asList(processor.computeCompletionProposals(viewer, offset)));
}
return res.toArray(new ICompletionProposal[res.size()]);
}
@Override
public IContextInformation[] computeContextInformation(ITextViewer viewer, int offset) {
List<IContextInformation> res = new ArrayList<>();
for (IContentAssistProcessor processor : this.fContentAssistProcessors) {
res.addAll(Arrays.asList(processor.computeContextInformation(viewer, offset)));
}
return res.toArray(new IContextInformation[res.size()]);
}
@Override
public char[] getCompletionProposalAutoActivationCharacters() {
Set<Character> res = new HashSet<>();
for (IContentAssistProcessor processor : this.fContentAssistProcessors) {
char[] chars = processor.getCompletionProposalAutoActivationCharacters();
if (chars != null) {
for (char c : chars) {
res.add(Character.valueOf(c));
}
}
}
return toCharArray(res);
}
private static char[] toCharArray(Set<Character> chars) {
char[] res = new char[chars.size()];
int i = 0;
for (Character c : chars) {
res[i] = c.charValue();
i++;
}
return res;
}
@Override
public char[] getContextInformationAutoActivationCharacters() {
Set<Character> res = new HashSet<>();
for (IContentAssistProcessor processor : this.fContentAssistProcessors) {
char[] chars = processor.getContextInformationAutoActivationCharacters();
if (chars != null) {
for (char c : chars) {
res.add(Character.valueOf(c));
}
}
}
return toCharArray(res);
}
@Override
public String getErrorMessage() {
StringBuilder res = new StringBuilder();
for (IContentAssistProcessor processor : this.fContentAssistProcessors) {
String errorMessage = processor.getErrorMessage();
if (errorMessage != null) {
res.append(errorMessage);
res.append('\n');
}
}
if (res.length() == 0) {
return null;
}
return res.toString();
}
@Override
public IContextInformationValidator getContextInformationValidator() {
return null;
}
}
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