oracle.toplink.essentials.queryframework.DataReadQuery Maven / Gradle / Ivy
/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* // Copyright (c) 1998, 2007, Oracle. All rights reserved.
*
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can obtain
* a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
* or glassfish/bootstrap/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
* Sun designates this particular file as subject to the "Classpath" exception
* as provided by Sun in the GPL Version 2 section of the License file that
* accompanied this code. If applicable, add the following below the License
* Header, with the fields enclosed by brackets [] replaced by your own
* identifying information: "Portions Copyrighted [year]
* [name of copyright owner]"
*
* Contributor(s):
*
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*/
package oracle.toplink.essentials.queryframework;
import java.util.*;
import oracle.toplink.essentials.internal.helper.*;
import oracle.toplink.essentials.exceptions.*;
import oracle.toplink.essentials.internal.queryframework.*;
import oracle.toplink.essentials.internal.sessions.AbstractRecord;
/**
* Purpose:
* Concrete class to perform read using raw SQL.
*
*
Responsibilities:
* Execute a selecting raw SQL string.
* This returns a Collection of the DatabaseRows representing the result set.
*
* @author Yvon Lavoie
* @since TOPLink/Java 1.0
*/
public class DataReadQuery extends ReadQuery {
protected ContainerPolicy containerPolicy;
//** For EJB 3 support returns results without using the AbstractRecord */
protected boolean useAbstractRecord = true;
/**
* PUBLIC:
* Initialize the state of the query.
*/
public DataReadQuery() {
super();
this.shouldMaintainCache = false;
useAbstractRecord = true;
setContainerPolicy(ContainerPolicy.buildPolicyFor(ClassConstants.Vector_class));
}
/**
* PUBLIC:
* Initialize the query to use the specified SQL string.
*/
public DataReadQuery(String sqlString) {
this();
setSQLString(sqlString);
}
/**
* PUBLIC:
* Initialize the query to use the specified call.
*/
public DataReadQuery(Call call) {
this();
setCall(call);
}
/**
* INTERNAL:
* Clone the query.
*/
public Object clone() {
DataReadQuery cloneQuery = (DataReadQuery)super.clone();
cloneQuery.setContainerPolicy(getContainerPolicy().clone(cloneQuery));
return cloneQuery;
}
/**
* INTERNAL:
* Execute the query.
* Perform the work to execute the SQL string.
* @exception DatabaseException an error has occurred on the database
* @return a collection or cursor of DatabaseRows representing the result set
*/
public Object executeDatabaseQuery() throws DatabaseException {
if (getContainerPolicy().overridesRead()) {
return getContainerPolicy().execute();
}
return executeNonCursor();
}
/**
* INTERNAL:
* The results are *not* in a cursor, build the collection.
*/
protected Object executeNonCursor() throws DatabaseException {
Vector rows = getQueryMechanism().executeSelect();
if (useAbstractRecord ){
Object results = getContainerPolicy().buildContainerFromVector(rows, getSession());
return results;
}
ContainerPolicy containerPolicy = getContainerPolicy();
Object reportResults = containerPolicy.containerInstance(rows.size());
for (Iterator rowsEnum = rows.iterator(); rowsEnum.hasNext();) {
containerPolicy.addInto( ((AbstractRecord)rowsEnum.next()).getValues() , reportResults, getSession());
}
return reportResults;
}
/**
* PUBLIC:
* Return the query's ContainerPolicy.
* @return oracle.toplink.essentials.internal.queryframework.ContainerPolicy
*/
public ContainerPolicy getContainerPolicy() {
return containerPolicy;
}
/**
* PUBLIC:
* Return if this is a data read query.
*/
public boolean isDataReadQuery() {
return true;
}
/**
* INTERNAL:
* Prepare the receiver for execution in a session.
*/
protected void prepare() {
super.prepare();
getContainerPolicy().prepare(this, getSession());
if (getContainerPolicy().overridesRead()) {
return;
}
getQueryMechanism().prepareExecuteSelect();
}
/**
* INTERNAL:
* Prepare the receiver for execution in a session.
*/
public void prepareForExecution() throws QueryException {
super.prepareForExecution();
getContainerPolicy().prepareForExecution();
}
/**
* PUBLIC:
* Set the container policy.
*/
public void setContainerPolicy(ContainerPolicy containerPolicy) {
// Fix for BUG 3337003 - TopLink OX will try to set this to null if
// it is not set in the deployment XML. So don't allow it to do that.
if (containerPolicy == null) {
return;
}
this.containerPolicy = containerPolicy;
}
/**
* PUBLIC:
* Configure the query to use an instance of the specified container class
* to hold the target objects.
* The container class must implement (directly or indirectly) the Collection interface.
*/
public void useCollectionClass(Class concreteClass) {
setContainerPolicy(ContainerPolicy.buildPolicyFor(concreteClass));
}
/**
* INTERNAL:
* Allow changing the default behaviour so that AbstractRecords are not returned as query results.
*/
public void setUseAbstractRecord(boolean useAbstractRecord){
this.useAbstractRecord = useAbstractRecord;
}
}