AbstractData.java revision 56ed4167b942ec265f9cee70ac4d71d10b3835ce 
1/*
2 * Copyright (C) 2010 Google Inc.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.google.clearsilver.jsilver.data;
18
19import com.google.clearsilver.jsilver.autoescape.EscapeMode;
20
21import java.io.IOException;
22
23/**
24 * This class is meant to hold implementation common to different instances of Data interface.
25 */
26public abstract class AbstractData implements Data {
27
28  protected EscapeMode escapeMode = EscapeMode.ESCAPE_NONE;
29
30  public int getIntValue() {
31    // If we ever use the integer value of a node to create the string
32    // representation we must ensure that an empty node is not mistaken
33    // for a node with the integer value '0'.
34    return TypeConverter.asNumber(getValue());
35  }
36
37  public boolean getBooleanValue() {
38    // If we ever use the boolean value of a node to create the string
39    // representation we must ensure that an empty node is not mistaken
40    // for a node with the boolean value 'false'.
41    return TypeConverter.asBoolean(getValue());
42  }
43
44  // ******************* Convenience methods *******************
45
46  /**
47   * Retrieves the value at the specified path in this HDF node's subtree.
48   *
49   * Use {@link #getValue(String)} in preference to ensure ClearSilver compatibility.
50   */
51  public String getValue(String path, String defaultValue) {
52    Data child = getChild(path);
53    if (child == null) {
54      return defaultValue;
55    } else {
56      String result = child.getValue();
57      return result == null ? defaultValue : result;
58    }
59  }
60
61  /**
62   * Retrieves the integer value at the specified path in this HDF node's subtree. If the value does
63   * not exist, or cannot be converted to an integer, default_value will be returned.
64   *
65   * Use {@link #getValue(String)} in preference to ensure ClearSilver compatibility.
66   */
67  public int getIntValue(String path, int defaultValue) {
68    Data child = getChild(path);
69    if (child == null) {
70      return defaultValue;
71    } else {
72      String result = child.getValue();
73      try {
74        return result == null ? defaultValue : TypeConverter.parseNumber(result);
75      } catch (NumberFormatException e) {
76        return defaultValue;
77      }
78    }
79  }
80
81  /**
82   * Retrieves the value at the specified path in this HDF node's subtree. If not found, returns
83   * null.
84   */
85  public String getValue(String path) {
86    return getValue(path, null);
87  }
88
89  /**
90   * Retrieves the value at the specified path in this HDF node's subtree. If not found or invalid,
91   * returns 0.
92   */
93  public int getIntValue(String path) {
94    return TypeConverter.asNumber(getChild(path));
95  }
96
97  /**
98   * Retrieves the value at the specified path in this HDF node's subtree. If not found or invalid,
99   * returns false.
100   */
101  public boolean getBooleanValue(String path) {
102    return TypeConverter.asBoolean(getChild(path));
103  }
104
105  /**
106   * Sets the value at the specified path in this HDF node's subtree.
107   */
108  public void setValue(String path, String value) {
109    Data child = createChild(path);
110    child.setValue(value);
111  }
112
113  // ******************* String representation *******************
114
115  @Override
116  public String toString() {
117    StringBuilder stringBuilder = new StringBuilder();
118    toString(stringBuilder, 0);
119    return stringBuilder.toString();
120  }
121
122  public void toString(StringBuilder out, int indent) {
123    try {
124      write(out, indent);
125    } catch (IOException ioe) {
126      throw new RuntimeException(ioe); // COV_NF_LINE
127    }
128  }
129
130  @Override
131  public void optimize() {
132  // Do nothing.
133  }
134
135  @Override
136  public void setEscapeMode(EscapeMode mode) {
137    this.escapeMode = mode;
138  }
139
140  @Override
141  public EscapeMode getEscapeMode() {
142    return escapeMode;
143  }
144}
145