/*
 * 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
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 * 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
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 */
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/**
 * 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., templateStartconstraintNametemplateEnd).
Params:
templateStart – The pattern denoting the start of the constraint name within the message.
templateEnd –   The pattern denoting the end of the constraint name within the message.
message –       The templated error message containing the constraint name.
Returns:
The found constraint name, or null./**
	 * 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.indexOf( templateEnd, start );
		if ( end < 0 ) {
			end = message.length();
		}

		return message.substring( start, end );
	}

}