/*
* 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.isis.objectstore.jdo.datanucleus.persistence.queries;
import javax.jdo.PersistenceManager;
import javax.jdo.Query;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.isis.core.metamodel.spec.ObjectSpecification;
public final class QueryUtil {
private static final Logger LOG = LoggerFactory.getLogger(QueryUtil.class);
private QueryUtil() {}
public static Query createQuery(
final PersistenceManager persistenceManager,
final String alias,
final String select,
final ObjectSpecification specification,
final String whereClause) {
final StringBuilder buf = new StringBuilder(128);
appendSelect(buf, select, alias);
appendFrom(buf, specification, alias);
appendWhere(buf, whereClause);
final String queryString = buf.toString();
if (LOG.isDebugEnabled()) {
LOG.debug("creating query: " + queryString);
}
final Query jdoQuery = persistenceManager.newQuery(queryString);
// http://www.datanucleus.org/servlet/jira/browse/NUCCORE-1103
jdoQuery.addExtension("datanucleus.multivaluedFetch", "none");
return jdoQuery;
}
private static StringBuilder appendSelect(
final StringBuilder buf,
final String select,
String alias) {
if (select != null) {
buf.append(select);
} else {
buf.append("select ");
// not required in JDOQL (cf JPA QL)
// buf.append(alias);
}
buf.append(" ");
return buf;
}
private static void appendWhere(StringBuilder buf, String whereClause) {
if(whereClause == null) {
return;
}
buf.append(" where ").append(whereClause);
}
private static StringBuilder appendFrom(
final StringBuilder buf,
final ObjectSpecification specification,
final String alias) {
return buf.append("from ")
.append(specification.getFullIdentifier())
.append(" as ")
.append(alias);
}
}
// Copyright (c) Naked Objects Group Ltd.