1 package org.apache.maven.index.expr;
2
3 /*
4 * Licensed to the Apache Software Foundation (ASF) under one
5 * or more contributor license agreements. See the NOTICE file
6 * distributed with this work for additional information
7 * regarding copyright ownership. The ASF licenses this file
8 * to you under the Apache License, Version 2.0 (the
9 * "License"); you may not use this file except in compliance
10 * with the License. You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing,
15 * software distributed under the License is distributed on an
16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17 * KIND, either express or implied. See the License for the
18 * specific language governing permissions and limitations
19 * under the License.
20 */
21
22 /**
23 * A simple string based implementation of SearchExpression that is immutable.
24 *
25 * @author cstamas
26 */
27 public class StringSearchExpression
28 implements SearchExpression
29 {
30 private final String expression;
31
32 public StringSearchExpression( final String expression )
33 {
34 if ( expression == null || expression.trim().length() == 0 )
35 {
36 throw new IllegalArgumentException( "The expression's string cannot be empty!" );
37 }
38
39 this.expression = expression;
40 }
41
42 public String getStringValue()
43 {
44 return expression;
45 }
46 }