1 /*
2 * $Id: AbstractModelBody.java 1692328 2015-07-22 21:16:35Z mck $
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 package org.apache.tiles.autotag.core.runtime;
22
23 import java.io.IOException;
24 import java.io.StringWriter;
25 import java.io.Writer;
26 import java.util.regex.Pattern;
27
28 import org.apache.tiles.autotag.core.runtime.util.NullWriter;
29
30 /**
31 * Base class for the abstraction of the body.
32 *
33 * @version $Rev: 1692328 $ $Date: 2015-07-22 23:16:35 +0200 (Wed, 22 Jul 2015) $
34 */
35 public abstract class AbstractModelBody implements ModelBody {
36
37 // precompiled the pattern to avoid compiling on every method call
38 private static final Pattern PATTERN = Pattern.compile("^\\s*|\\s*$");
39
40 /**
41 * The default writer to use.
42 */
43 private Writer defaultWriter;
44
45 /**
46 * Constructor.
47 *
48 * @param defaultWriter The default writer to use.
49 */
50 public AbstractModelBody(Writer defaultWriter) {
51 this.defaultWriter = defaultWriter;
52 }
53
54 @Override
55 public void evaluate() throws IOException {
56 evaluate(defaultWriter);
57 }
58
59 @Override
60 public String evaluateAsString() throws IOException {
61 StringWriter writer = new StringWriter();
62 try {
63 evaluate(writer);
64 } finally {
65 writer.close();
66 }
67 String body = writer.toString();
68 if (body != null) {
69 body = PATTERN.matcher(body).replaceAll("");
70 if (body.length() <= 0) {
71 body = null;
72 }
73 }
74 return body;
75 }
76
77 @Override
78 public void evaluateWithoutWriting() throws IOException {
79 NullWriter writer = new NullWriter();
80 try {
81 evaluate(writer);
82 } finally {
83 writer.close();
84 }
85 }
86
87 }