/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2008-2011, Red Hat Inc. 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 Inc.
*
* 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.exception.spi;
/**
* Knows how to extract a violated constraint name from an error message based on the
* fact that the constraint name is templated within the message.
*
* @author Steve Ebersole
*/
public abstract class TemplatedViolatedConstraintNameExtracter implements ViolatedConstraintNameExtracter {
/**
* Extracts the constraint name based on a template (i.e., <i>templateStart</i><b>constraintName</b><i>templateEnd</i>).
*
* @param templateStart The pattern denoting the start of the constraint name within the message.
* @param templateEnd The pattern denoting the end of the constraint name within the message.
* @param message The templated error message containing the constraint name.
* @return The found constraint name, or null.
*/
protected String extractUsingTemplate(String templateStart, String templateEnd, String message) {
int templateStartPosition = message.indexOf( templateStart );
if ( templateStartPosition < 0 ) {
return null;
}
int start = templateStartPosition + templateStart.length();
int end = message.lastIndexOf( templateEnd, start );
if ( end < 0 ) {
end = message.length();
}
return message.substring( start, end );
}
}