01: /*
02: * Licensed to the Apache Software Foundation (ASF) under one or more
03: * contributor license agreements. See the NOTICE file distributed with
04: * this work for additional information regarding copyright ownership.
05: * The ASF licenses this file to You under the Apache License, Version 2.0
06: * (the "License"); you may not use this file except in compliance with
07: * the License. You may obtain a copy of the License at
08: *
09: * http://www.apache.org/licenses/LICENSE-2.0
10: *
11: * Unless required by applicable law or agreed to in writing, software
12: * distributed under the License is distributed on an "AS IS" BASIS,
13: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14: * See the License for the specific language governing permissions and
15: * limitations under the License.
16: */
17: package org.apache.cocoon.forms.expression;
18:
19: import org.outerj.expression.AbstractExpression;
20: import org.outerj.expression.ExpressionContext;
21: import org.outerj.expression.ExpressionException;
22: import org.outerj.expression.Expression;
23:
24: /**
25: * Converts argument to the string. Useful when concatenating non-string
26: * values, such as numbers.
27: *
28: * @version $Id: StringFunction.java 449149 2006-09-23 03:58:05Z crossley $
29: */
30: public class StringFunction extends AbstractExpression {
31:
32: public Object evaluate(ExpressionContext context)
33: throws ExpressionException {
34: return String.valueOf(((Expression) arguments.get(0))
35: .evaluate(context));
36: }
37:
38: public Class getResultType() {
39: return String.class;
40: }
41:
42: public String getDescription() {
43: return "String function";
44: }
45: }
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