util/src/main/java/org/apache/etch/util/cmd/StringLengthConstraint.java

/* $Id$
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.etch.util.cmd;

/**
 * Description of StringLengthConstraint
 */
public class StringLengthConstraint implements Constraint
{
	/**
	 * Constructs the StringLengthConstraint.
	 *
	 * @param min the minimum value allowed.
	 * 
	 * @param max the maximum value allowed.
	 */
	public StringLengthConstraint( int min, int max )
	{
		if (min > max)
			throw new IllegalArgumentException( "min > max" );
		this.min = min;
		this.max = max;
	}
	
	private final int min;
	
	private final int max;
	
	public void checkValue( Object value ) throws Exception
	{
		int v = ((String) value).length();
		if (v < min || v > max)
			throw new Exception( "length not in range "+min+" to "+max );
	}

	@Override
	public String toString()
	{
		return "length must be in range "+min+" to "+max;
	}
}