org.hibernate.sql.HSQLCaseFragment Maven / Gradle / Ivy
/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2008, Red Hat Middleware LLC or third-party contributors as
* indicated by the @author tags or express copyright attribution
* statements applied by the authors. All third-party contributions are
* distributed under license by Red Hat Middleware LLC.
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301 USA
*
*/
package org.hibernate.sql;
import java.util.Iterator;
import java.util.Map;
/**
* The HSQL CASEWHEN function.
*
* casewhen(..., ..., ...) as ...
*
* @author Wolfgang Jung
*/
public class HSQLCaseFragment extends CaseFragment {
public String toFragmentString() {
StringBuffer buf = new StringBuffer( cases.size() * 15 + 10 );
StringBuffer buf2 = new StringBuffer( cases.size() );
Iterator iter = cases.entrySet().iterator();
while ( iter.hasNext() ) {
Map.Entry me = (Map.Entry) iter.next();
buf.append(" casewhen(")
.append( me.getKey() )
.append(" is not null")
.append(", ")
.append( me.getValue() )
.append(", ");
buf2.append(")");
}
buf.append("-1"); //null caused some problems
buf.append( buf2.toString() );
if ( returnColumnName!=null ) {
buf.append(" as ")
.append(returnColumnName);
}
return buf.toString();
}
}