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/*******************************************************************************
* Copyright (c) 2015 Tasktop Technologies 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:
* Tasktop Technologies - initial API and implementation
*******************************************************************************/
package org.eclipse.mylyn.internal.tasks.ui;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.eclipse.jface.fieldassist.ContentProposal;
import org.eclipse.jface.fieldassist.IContentProposal;
import org.eclipse.jface.fieldassist.IContentProposalProvider;
import org.eclipse.mylyn.internal.tasks.ui.editors.LabelsAttributeEditor;
import com.google.common.base.Function;
import com.google.common.collect.FluentIterable;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Ordering;
public class OptionsProposalProvider implements IContentProposalProvider {
private static final String VALUE_SEPARATOR = ","; //$NON-NLS-1$
private final Set<String> proposals;
private final boolean isMultiSelect;
public OptionsProposalProvider(Map<String, String> proposals, boolean isMultiSelect) {
this.proposals = proposals.keySet();
this.isMultiSelect = isMultiSelect;
}
@Override
public IContentProposal[] getProposals(String contents, int position) {
Set<String> filteredProposals = new HashSet<>(proposals);
filteredProposals.remove(""); //$NON-NLS-1$
String lastValue = ""; //$NON-NLS-1$
// If the attribute is of type multi-select, filter the past values from the proposals
if (isMultiSelect) {
String[] contentsArray = contents.split(VALUE_SEPARATOR, -1);
if (contentsArray.length > 0) {
List<String> trimmedContents = LabelsAttributeEditor.getTrimmedValues(contentsArray);
filteredProposals.removeAll(trimmedContents);
lastValue = contentsArray[contentsArray.length - 1].trim();
}
} else {
lastValue = contents;
}
// If there is a last value, then filter the remaining the proposals to contain it
if (!lastValue.isEmpty()) {
for (Iterator<String> iterator = filteredProposals.iterator(); iterator.hasNext();) {
String proposal = iterator.next();
if (!proposal.toLowerCase().contains(lastValue.toLowerCase())) {
iterator.remove();
}
}
}
// Since the contents of the editor is replaced, we need to include the existing values in the replacement
final String existingValues = contents.substring(0, contents.length() - lastValue.length());
ImmutableList<String> sortedProposals = FluentIterable.from(filteredProposals).toSortedList(
Ordering.from(String.CASE_INSENSITIVE_ORDER));
return FluentIterable.from(sortedProposals).transform(new Function<String, IContentProposal>() {
public IContentProposal apply(String proposal) {
return new ContentProposal(existingValues + proposal, proposal, null);
}
}).toArray(IContentProposal.class);
}
public boolean isMultiSelect() {
return isMultiSelect;
}
}
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