package org.apache.maven.index.expr;

 /*

  * 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.

  */

 /**

  * A simple string based implementation of SearchExpression that is immutable.

  * 

  * @author cstamas

  */

 public class StringSearchExpression

     implements SearchExpression

 {

     private final String expression;

     public StringSearchExpression( final String expression )

     {

         if ( expression == null || expression.trim().length() == 0 )

         {

             throw new IllegalArgumentException( "The expression's string cannot be empty!" );

         }

         this.expression = expression;

     }

     public String getStringValue()

     {

         return expression;

     }

 }