/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.jackrabbit.core.query;
import java.util.HashMap;
import java.util.Map;
import javax.jcr.Node;
import javax.jcr.RepositoryException;
import javax.jcr.Value;
import javax.jcr.query.InvalidQueryException;
import javax.jcr.query.QueryResult;
import javax.jcr.query.qom.Column;
import javax.jcr.query.qom.Constraint;
import javax.jcr.query.qom.Ordering;
import javax.jcr.query.qom.QueryObjectModel;
import javax.jcr.query.qom.Source;
import org.apache.jackrabbit.commons.query.QueryObjectModelBuilderRegistry;
import org.apache.jackrabbit.core.query.lucene.LuceneQueryFactory;
import org.apache.jackrabbit.core.query.lucene.SearchIndex;
import org.apache.jackrabbit.core.query.lucene.join.QueryEngine;
import org.apache.jackrabbit.core.session.SessionContext;
import org.apache.jackrabbit.spi.commons.query.qom.BindVariableValueImpl;
import org.apache.jackrabbit.spi.commons.query.qom.DefaultTraversingQOMTreeVisitor;
import org.apache.jackrabbit.spi.commons.query.qom.QueryObjectModelTree;
/**
* <code>QueryObjectModelImpl</code> implements the query object model.
*/
public class QueryObjectModelImpl extends QueryImpl implements QueryObjectModel {
/**
* The query object model tree.
*/
protected QueryObjectModelTree qomTree;
/** Bind variables */
private final Map<String, Value> variables = new HashMap<String, Value>();
private LuceneQueryFactory lqf;
/**
* {@inheritDoc}
* @throws UnsupportedOperationException always.
*/
@Override
public void init(
SessionContext sessionContext, QueryHandler handler,
String statement, String language, Node node)
throws InvalidQueryException {
throw new UnsupportedOperationException();
}
/**
* Initializes a query instance from a query object model.
*
* @param sessionContext component context of the current session
* @param handler the query handler of the search index.
* @param qomTree the query object model tree.
* @param language the original query syntax from where the JQOM was
* created.
* @param node a nt:query node where the query was read from or
* <code>null</code> if it is not a stored query.
* @throws InvalidQueryException if the qom tree cannot be serialized
* according to the given language.
* @throws RepositoryException if another error occurs
*/
public void init(
SessionContext sessionContext, QueryHandler handler,
QueryObjectModelTree qomTree, String language, Node node)
throws InvalidQueryException, RepositoryException {
checkNotInitialized();
this.sessionContext = sessionContext;
this.language = language;
this.handler = handler;
this.qomTree = qomTree;
this.node = node;
this.statement = QueryObjectModelBuilderRegistry.getQueryObjectModelBuilder(language).toString(this);
try {
qomTree.accept(new DefaultTraversingQOMTreeVisitor() {
@Override
public Object visit(BindVariableValueImpl node, Object data) {
variables.put(node.getBindVariableName(), null);
return data;
}
}, null);
} catch (Exception ignore) {
}
this.lqf = new LuceneQueryFactory(
sessionContext.getSessionImpl(), (SearchIndex) handler,
variables);
setInitialized();
}
public QueryResult execute() throws RepositoryException {
QueryEngine engine = new QueryEngine(
sessionContext.getSessionImpl(), lqf, variables);
return engine.execute(
getColumns(), getSource(), getConstraint(),
getOrderings(), offset, limit);
}
@Override
public String[] getBindVariableNames() {
return variables.keySet().toArray(new String[variables.size()]);
}
@Override
public void bindValue(String varName, Value value)
throws IllegalArgumentException {
if (variables.containsKey(varName)) {
variables.put(varName, value);
} else {
throw new IllegalArgumentException(
"No such bind variable: " + varName);
}
}
//-------------------------< QueryObjectModel >-----------------------------
/**
* Gets the node-tuple source for this query.
*
* @return the node-tuple source; non-null
*/
public Source getSource() {
return qomTree.getSource();
}
/**
* Gets the constraint for this query.
*
* @return the constraint, or null if none
*/
public Constraint getConstraint() {
return qomTree.getConstraint();
}
/**
* Gets the orderings for this query.
*
* @return an array of zero or more orderings; non-null
*/
public Ordering[] getOrderings() {
return qomTree.getOrderings();
}
/**
* Gets the columns for this query.
*
* @return an array of zero or more columns; non-null
*/
public Column[] getColumns() {
return qomTree.getColumns();
}
}