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/*******************************************************************************
* Copyright (c) 2010 Oracle 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:
* Oracle Corporation - initial API and implementation and/or initial documentation
*******************************************************************************/
package org.eclipse.jst.jsf.common.metadata.query.internal;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import org.eclipse.jst.jsf.common.metadata.Entity;
import org.eclipse.jst.jsf.common.metadata.Trait;
import org.eclipse.jst.jsf.common.metadata.query.AbstractTraitQueryVisitor;
import org.eclipse.jst.jsf.common.metadata.query.IResultSet;
import org.eclipse.jst.jsf.common.metadata.query.MetaDataException;
import org.eclipse.jst.jsf.common.metadata.query.internal.IPredicateMatcher.MATCH;
/**
* Visits a set of entities matching by trait predicate matcher
*
*/
public class TraitQuerySpecVisitor extends AbstractTraitQueryVisitor {
private List<Trait> _traitResults;
private Collection<Entity> _entities;
private IPredicateMatcher<Trait> _matcher;
private SearchControl _control;
private boolean _stop;
/**
* Constructor using default search control
* @param entities
* @param traitMatcher
*/
public TraitQuerySpecVisitor(final Collection<Entity> entities, final IPredicateMatcher<Trait> traitMatcher) {
this(entities, traitMatcher, new SearchControl());
}
/**
* Constructor using search control for a single match
* @param entities
* @param traitMatcher
* @param control
*/
public TraitQuerySpecVisitor(final Collection<Entity> entities, final IPredicateMatcher<Trait> traitMatcher, final SearchControl control) {
super();
_entities = entities;
_matcher = traitMatcher;
_traitResults = new ArrayList<Trait>();
_control = control;
}
/**
* @return IResultSet<Trait> - will not be null
* @throws MetaDataException
*/
public IResultSet<Trait> findTraits() throws MetaDataException {
_matcher.reset();
if (_entities != null && _entities.size() > 0){
ENTITIES_LOOP: for (final Entity entity : _entities) {
final Iterator<Trait> it = entity.getTraits().iterator();
while (it.hasNext()) {
Trait trait = it.next();
trait.accept(this);
checkShouldStopVisiting();
if (stopVisiting())
break ENTITIES_LOOP;
}
}
}
return new SimpleResultSet(_traitResults);
}
public boolean stopVisiting() {
return _stop;
}
private void checkShouldStopVisiting(){
//implement how to set stop to signal to the entity accept() to skip visiting
if (_stop == false
&& _control.getCountLimit()== _traitResults.size()
&& _control.getCountLimit() != SearchControl.COUNT_LIMIT_NONE )
_stop = true;
}
@Override
public void visit(final Trait trait) {
final MATCH match = _matcher.matches(trait);
if (match == MATCH.FULLY) {
_traitResults.add(trait);
}
}
}
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