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/*******************************************************************************
* Copyright (c) 2004, 2008 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.dltk.internal.mylyn.editor;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.dltk.core.IModelElement;
import org.eclipse.dltk.internal.mylyn.DLTKUiBridgePlugin;
import org.eclipse.dltk.ui.text.completion.AbstractScriptCompletionProposal;
import org.eclipse.dltk.ui.text.completion.IScriptCompletionProposalComputer;
import org.eclipse.dltk.ui.text.completion.ScriptCompletionProposal;
import org.eclipse.mylyn.commons.core.StatusHandler;
import org.eclipse.mylyn.context.core.ContextCore;
import org.eclipse.mylyn.context.core.IInteractionElement;
import org.eclipse.mylyn.internal.provisional.commons.ui.CommonImages;
/**
* TODO: parametrize relevance levels (requires JDT changes, bug 119063)
*
* @author Mik Kersten
*/
public class FocusedDLTKProposalProcessor {
/**
* Range above which elements are part of the context.
*/
private static final int THRESHOLD_INTEREST = 10000;
/**
* Range for implicitly interesting element, such as method parameters.
*/
private static final int THRESHOLD_IMPLICIT_INTEREST = THRESHOLD_INTEREST * 2;
/**
* Threshold for determining which JDT proposals should be implicitly interesting.
*/
private static final int RELEVANCE_IMPLICIT_INTEREST_JAVA = 600;
/**
* Threshold for implicit interest of IModelElement proposals.
*/
private static final int RELEVANCE_IMPLICIT_INTEREST_MISC = 300;
private static final String IDENTIFIER_THIS = "this"; //$NON-NLS-1$
public static final String LABEL_SEPARATOR = " -------------------------------------------- "; //$NON-NLS-1$
public static final FocusedProposalSeparator PROPOSAL_SEPARATOR = new FocusedProposalSeparator();
private final List<IScriptCompletionProposalComputer> monitoredProposalComputers = new ArrayList<IScriptCompletionProposalComputer>();
private final List<IScriptCompletionProposalComputer> alreadyComputedProposals = new ArrayList<IScriptCompletionProposalComputer>();
private final List<IScriptCompletionProposalComputer> alreadyContainSeparator = new ArrayList<IScriptCompletionProposalComputer>();
private final List<IScriptCompletionProposalComputer> containsSingleInterestingProposal = new ArrayList<IScriptCompletionProposalComputer>();
private static FocusedDLTKProposalProcessor INSTANCE = new FocusedDLTKProposalProcessor();
private FocusedDLTKProposalProcessor() {
}
public static FocusedDLTKProposalProcessor getDefault() {
return INSTANCE;
}
public void addMonitoredComputer(IScriptCompletionProposalComputer proposalComputer) {
monitoredProposalComputers.add(proposalComputer);
}
@SuppressWarnings("unchecked")
public List projectInterestModel(IScriptCompletionProposalComputer proposalComputer, List proposals) {
try {
if (!ContextCore.getContextManager().isContextActive()) {
return proposals;
} else {
boolean hasInterestingProposals = false;
for (Object object : proposals) {
if (object instanceof AbstractScriptCompletionProposal) {
boolean foundInteresting = boostRelevanceWithInterest((AbstractScriptCompletionProposal) object);
if (!hasInterestingProposals && foundInteresting) {
hasInterestingProposals = true;
}
}
}
// NOTE: this annoying state needs to be maintainted to ensure
// the
// separator is added only once, and not added for single
// proposals
if (containsSingleInterestingProposal.size() > 0 && proposals.size() > 0) {
proposals.add(FocusedDLTKProposalProcessor.PROPOSAL_SEPARATOR);
} else if (hasInterestingProposals && alreadyContainSeparator.isEmpty()) {
if (proposals.size() == 1) {
containsSingleInterestingProposal.add(proposalComputer);
} else {
proposals.add(FocusedDLTKProposalProcessor.PROPOSAL_SEPARATOR);
alreadyContainSeparator.add(proposalComputer);
}
}
alreadyComputedProposals.add(proposalComputer);
if (alreadyComputedProposals.size() == monitoredProposalComputers.size()) {
alreadyComputedProposals.clear();
alreadyContainSeparator.clear();
containsSingleInterestingProposal.clear();
}
return proposals;
}
} catch (Throwable t) {
StatusHandler.log(new Status(IStatus.ERROR, DLTKUiBridgePlugin.ID_PLUGIN,
"Failed to project interest onto propsals", t)); //$NON-NLS-1$
return proposals;
}
}
private boolean boostRelevanceWithInterest(AbstractScriptCompletionProposal proposal) {
boolean hasInteresting = false;
IModelElement javaElement = proposal.getModelElement();
if (javaElement != null) {
IInteractionElement interactionElement = ContextCore.getContextManager().getElement(
javaElement.getHandleIdentifier());
float interest = interactionElement.getInterest().getValue();
if (interest > ContextCore.getCommonContextScaling().getInteresting()) {
// TODO: losing precision here, only going to one decimal place
proposal.setRelevance(THRESHOLD_INTEREST + (int) (interest * 10));
hasInteresting = true;
} else if (proposal.getRelevance() > RELEVANCE_IMPLICIT_INTEREST_JAVA) {
proposal.setRelevance(THRESHOLD_IMPLICIT_INTEREST + proposal.getRelevance());
}
} else if (isImplicitlyInteresting(proposal)) {
proposal.setRelevance(THRESHOLD_IMPLICIT_INTEREST + proposal.getRelevance());
hasInteresting = true;
}
return hasInteresting;
}
public boolean isImplicitlyInteresting(AbstractScriptCompletionProposal proposal) {
return proposal.getRelevance() > RELEVANCE_IMPLICIT_INTEREST_MISC
&& !IDENTIFIER_THIS.equals(proposal.getDisplayString());
}
static class FocusedProposalSeparator extends ScriptCompletionProposal {
public FocusedProposalSeparator() {
super("", 0, 0, CommonImages.getImage(CommonImages.SEPARATOR_LIST), LABEL_SEPARATOR, //$NON-NLS-1$
FocusedDLTKProposalProcessor.THRESHOLD_INTEREST);
}
@Override
protected boolean isSmartTrigger(char trigger) {
return false;
}
}
}
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