/*******************************************************************************
* Copyright (c) 1998, 2015 Oracle and/or its affiliates. All rights reserved.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0
* which accompanies this distribution.
* The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
* and the Eclipse Distribution License is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* Contributors:
* Oracle - initial API and implementation from Oracle TopLink
******************************************************************************/
package org.eclipse.persistence.queries;
import java.io.Serializable;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import org.eclipse.persistence.internal.databaseaccess.Accessor;
import org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor;
import org.eclipse.persistence.internal.queries.DatabaseQueryMechanism;
import org.eclipse.persistence.internal.queries.JPQLCallQueryMechanism;
import org.eclipse.persistence.internal.sessions.AbstractRecord;
import org.eclipse.persistence.internal.sessions.AbstractSession;
/**
* <b>Purpose</b>: Used as an abstraction of a database invocation.
* A call is an JPQL string.
* <p><b>Responsibilities</b>:<ul>
* <li> Parse the JPQL String
* <li> Populate the contained query's selection criteria. Add attributes to ReportQuery (if required).
* </ul>
* @author Jon Driscoll and Joel Lucuik
* @since TopLink 4.0
*/
public class JPQLCall implements Serializable, Call {
// Back reference to query, unfortunately required for events.
protected transient DatabaseQuery query;
protected String jpqlString;
// Check that we aren't parsing more than once
protected boolean isParsed;
/**
* PUBLIC:
* Create a new JPQLCall.
*/
public JPQLCall() {
super();
}
/**
* PUBLIC:
* Create a new JPQLCall with an jpqlString.
*/
public JPQLCall(String jpqlString) {
this();
this.jpqlString = jpqlString;
}
/**
* INTERNAL:
* Return the appropriate mechanism,
* with the call added as necessary.
*/
public DatabaseQueryMechanism buildNewQueryMechanism(DatabaseQuery query) {
return new JPQLCallQueryMechanism(query, this);
}
/**
* INTERNAL:
* Return the appropriate mechanism,
* with the call added as necessary.
*/
public DatabaseQueryMechanism buildQueryMechanism(DatabaseQuery query, DatabaseQueryMechanism mechanism) {
return buildNewQueryMechanism(query);
}
public Object clone() {
try {
return super.clone();
} catch (CloneNotSupportedException cnse) {
return null;
}
}
/**
* INTERNAL:
* Return the string for the call
*/
public String getCallString() {
return getEjbqlString();
}
/**
* INTERNAL:
* Return the EJBQL string for this call
*/
public String getEjbqlString() {
return jpqlString;
}
/**
* INTERNAL:
* Return the EJBQL string for this call
*/
public String getJPQLString() {
return jpqlString;
}
/**
* INTERNAL
* Return the isParsed state
*/
private boolean getIsParsed() {
return isParsed;
}
/**
* Back reference to query, unfortunately required for events.
*/
public DatabaseQuery getQuery() {
return query;
}
/**
* INTERNAL:
* Return the SQL string for this call. Always return null
* since this is an EJBQL call
*/
public String getLogString(Accessor accessor) {
return getSQLString();
}
/**
* INTERNAL:
* Return the SQL string for this call. Always return null
* since this is an EJBQL call
*/
public String getSQLString() {
return null;
}
/**
* INTERNAL:
* Yes this is an JPQLCall
*/
public boolean isJPQLCall() {
return true;
}
/**
* Return whether all the results of the call have been returned.
*/
public boolean isFinished() {
//never used, but required for implementing Call.
return true;
}
/**
* INTERNAL
* Is this query Parsed
*/
public boolean isParsed() {
return getIsParsed();
}
/**
* Populate the query using the information retrieved from parsing the EJBQL.
*/
public void populateQuery(AbstractSession session) {
if (!isParsed()) {
JPAQueryBuilder queryBuilder = session.getQueryBuilder();
queryBuilder.populateQuery(getEjbqlString(), getQuery(), session);
// Make sure we don't parse and prepare again.
this.setIsParsed(true);
}
}
/**
* INTERNAL:
* Prepare the JDBC statement, this may be parameterize or a call statement.
* If caching statements this must check for the pre-prepared statement and re-bind to it.
*/
public PreparedStatement prepareStatement(DatabaseAccessor accessor, AbstractRecord translationRow, AbstractSession session) throws SQLException {
return null;
}
/**
* INTERNAL:
* Set the EJBQL string for this call
*/
public void setEjbqlString(String jpqlString) {
this.jpqlString = jpqlString;
}
/**
* INTERNAL:
* Set the JPQL string for this call
*/
public void setJPQLString(String jpqlString) {
this.jpqlString = jpqlString;
}
/**
* INTERNAL
* Set the isParsed state
*/
public void setIsParsed(boolean newIsParsed) {
this.isParsed = newIsParsed;
}
/**
* INTERNAL:
* Back reference to query, unfortunately required for events.
*/
public void setQuery(DatabaseQuery query) {
this.query = query;
}
/**
* INTERNAL:
* translate method comment.
*/
public void translate(AbstractRecord translationRow, AbstractRecord modifyRow, AbstractSession session) {
}
/**
* The return type is one of, NoReturn, ReturnOneRow or ReturnManyRows.
*/
public boolean isNothingReturned() {
return false;
}
/**
* The return type is one of, NoReturn, ReturnOneRow or ReturnManyRows.
*/
public boolean isOneRowReturned() {
return false;
}
/**
* INTERNAL:
* Print the JPQL string.
*/
public String toString() {
String name = getClass().getSimpleName();
if (getJPQLString() == null) {
return name;
} else {
return name + "(" + getJPQLString() + ")";
}
}
}