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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  }