/*
* #!
* Ontopia Engine
* #-
* Copyright (C) 2001 - 2013 The Ontopia Project
* #-
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* !#
*/
package net.ontopia.topicmaps.query.impl.rdbms;
import java.util.List;
import net.ontopia.infoset.core.LocatorIF;
import net.ontopia.infoset.impl.basic.URILocator;
import net.ontopia.persistence.query.jdo.JDOBoolean;
import net.ontopia.persistence.query.jdo.JDOContains;
import net.ontopia.persistence.query.jdo.JDOEquals;
import net.ontopia.persistence.query.jdo.JDOField;
import net.ontopia.persistence.query.jdo.JDOObject;
import net.ontopia.persistence.query.jdo.JDOValueIF;
import net.ontopia.topicmaps.core.TMObjectIF;
import net.ontopia.topicmaps.core.TopicMapIF;
import net.ontopia.topicmaps.impl.rdbms.SourceLocator;
import net.ontopia.topicmaps.query.core.InvalidQueryException;
/**
* INTERNAL: Implements the 'item-identifier(tmobject,locator)' predicate.
*/
public class ItemIdentifierPredicate
extends net.ontopia.topicmaps.query.impl.basic.ItemIdentifierPredicate
implements JDOPredicateIF {
public ItemIdentifierPredicate(TopicMapIF topicmap, String predicateName) {
super(topicmap, predicateName);
}
// --- JDOPredicateIF implementation
public boolean isRecursive() {
return false;
}
public void prescan(QueryBuilder builder, List arguments) {
}
public boolean buildQuery(QueryBuilder builder, List expressions, List arguments)
throws InvalidQueryException {
// Interpret arguments
Object[] args = arguments.toArray();
if (args[0] instanceof TMObjectIF && args[1] instanceof String) {
// Do direct predicate evaluation
TMObjectIF tmobject = (TMObjectIF)args[0];
LocatorIF locator = null;
try {
locator = new SourceLocator(new URILocator((String)args[1]));
} catch (java.net.MalformedURLException e) {
throw new InvalidQueryException("Not a valid URI: " + args[1]);
}
if (tmobject.getItemIdentifiers().contains(locator))
expressions.add(JDOBoolean.TRUE);
else
expressions.add(JDOBoolean.FALSE);
} else {
// BUG #2003: avoid situaton where T instanceof TopicMapIF
if (builder.isArgumentOfType(args[0], TopicMapIF.class))
return false;
JDOValueIF jv_tmobject = builder.createJDOValue(args[0]);
JDOValueIF jv_locator = builder.createJDOVariable("L", SourceLocator.class);
JDOValueIF jv_uri = builder.createJDOValue(args[1]);
// JDOQL: T.sources.contains(L) && L.address = U
expressions.add(new JDOContains(new JDOField(jv_tmobject, "sources"), jv_locator));
expressions.add(new JDOEquals(new JDOField(jv_locator, "address"), jv_uri));
// JDOQL: T.topicmap = TOPICMAP
expressions.add(new JDOEquals(new JDOField(jv_tmobject, "topicmap"),
new JDOObject(topicmap)));
}
return true;
}
}