Source Code Cross Referenced for PropertyListConfiguration.java in  » Library » Apache-commons-configuration-1.4-src » org » apache » commons » configuration » plist » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Library » Apache commons configuration 1.4 src » org.apache.commons.configuration.plist 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Licensed to the Apache Software Foundation (ASF) under one or more
003:         * contributor license agreements.  See the NOTICE file distributed with
004:         * this work for additional information regarding copyright ownership.
005:         * The ASF licenses this file to You under the Apache License, Version 2.0
006:         * (the "License"); you may not use this file except in compliance with
007:         * the License.  You may obtain a copy of the License at
008:         *
009:         *     http://www.apache.org/licenses/LICENSE-2.0
010:         *
011:         * Unless required by applicable law or agreed to in writing, software
012:         * distributed under the License is distributed on an "AS IS" BASIS,
013:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014:         * See the License for the specific language governing permissions and
015:         * limitations under the License.
016:         */
017:
018:        package org.apache.commons.configuration.plist;
019:
020:        import java.io.File;
021:        import java.io.PrintWriter;
022:        import java.io.Reader;
023:        import java.io.Writer;
024:        import java.net.URL;
025:        import java.util.ArrayList;
026:        import java.util.Iterator;
027:        import java.util.List;
028:        import java.util.Map;
029:
030:        import org.apache.commons.codec.binary.Hex;
031:        import org.apache.commons.configuration.AbstractHierarchicalFileConfiguration;
032:        import org.apache.commons.configuration.Configuration;
033:        import org.apache.commons.configuration.ConfigurationException;
034:        import org.apache.commons.configuration.HierarchicalConfiguration;
035:        import org.apache.commons.configuration.MapConfiguration;
036:        import org.apache.commons.lang.StringUtils;
037:
038:        /**
039:         * NeXT / OpenStep style configuration.
040:         * (http://developer.apple.com/documentation/Cocoa/Conceptual/PropertyLists/Concepts/OldStylePListsConcept.html)
041:         *
042:         * <p>Example:</p>
043:         * <pre>
044:         * {
045:         *     foo = "bar";
046:         *
047:         *     array = ( value1, value2, value3 );
048:         *
049:         *     data = &lt;4f3e0145ab>;
050:         *
051:         *     nested =
052:         *     {
053:         *         key1 = value1;
054:         *         key2 = value;
055:         *         nested =
056:         *         {
057:         *             foo = bar
058:         *         }
059:         *     }
060:         * }
061:         * </pre>
062:         *
063:         * @since 1.2
064:         *
065:         * @author Emmanuel Bourg
066:         * @version $Revision: 492216 $, $Date: 2007-01-03 17:51:24 +0100 (Mi, 03 Jan 2007) $
067:         */
068:        public class PropertyListConfiguration extends
069:                AbstractHierarchicalFileConfiguration {
070:            /**
071:             * The serial version UID.
072:             */
073:            private static final long serialVersionUID = 3227248503779092127L;
074:
075:            /** Size of the indentation for the generated file. */
076:            private static final int INDENT_SIZE = 4;
077:
078:            /**
079:             * Creates an empty PropertyListConfiguration object which can be
080:             * used to synthesize a new plist file by adding values and
081:             * then saving().
082:             */
083:            public PropertyListConfiguration() {
084:            }
085:
086:            /**
087:             * Creates a new instance of <code>PropertyListConfiguration</code> and
088:             * copies the content of the specified configuration into this object.
089:             *
090:             * @param c the configuration to copy
091:             * @since 1.4
092:             */
093:            public PropertyListConfiguration(HierarchicalConfiguration c) {
094:                super (c);
095:            }
096:
097:            /**
098:             * Creates and loads the property list from the specified file.
099:             *
100:             * @param fileName The name of the plist file to load.
101:             * @throws ConfigurationException Error while loading the plist file
102:             */
103:            public PropertyListConfiguration(String fileName)
104:                    throws ConfigurationException {
105:                super (fileName);
106:            }
107:
108:            /**
109:             * Creates and loads the property list from the specified file.
110:             *
111:             * @param file The plist file to load.
112:             * @throws ConfigurationException Error while loading the plist file
113:             */
114:            public PropertyListConfiguration(File file)
115:                    throws ConfigurationException {
116:                super (file);
117:            }
118:
119:            /**
120:             * Creates and loads the property list from the specified URL.
121:             *
122:             * @param url The location of the plist file to load.
123:             * @throws ConfigurationException Error while loading the plist file
124:             */
125:            public PropertyListConfiguration(URL url)
126:                    throws ConfigurationException {
127:                super (url);
128:            }
129:
130:            public void load(Reader in) throws ConfigurationException {
131:                PropertyListParser parser = new PropertyListParser(in);
132:                try {
133:
134:                    HierarchicalConfiguration config = parser.parse();
135:                    setRoot(config.getRoot());
136:                } catch (ParseException e) {
137:                    throw new ConfigurationException(e);
138:                }
139:            }
140:
141:            public void save(Writer out) throws ConfigurationException {
142:                PrintWriter writer = new PrintWriter(out);
143:                printNode(writer, 0, getRoot());
144:                writer.flush();
145:            }
146:
147:            /**
148:             * Append a node to the writer, indented according to a specific level.
149:             */
150:            private void printNode(PrintWriter out, int indentLevel, Node node) {
151:                String padding = StringUtils.repeat(" ", indentLevel
152:                        * INDENT_SIZE);
153:
154:                if (node.getName() != null) {
155:                    out.print(padding + quoteString(node.getName()) + " = ");
156:                }
157:
158:                // get all non trivial nodes
159:                List children = new ArrayList(node.getChildren());
160:                Iterator it = children.iterator();
161:                while (it.hasNext()) {
162:                    Node child = (Node) it.next();
163:                    if (child.getValue() == null
164:                            && (child.getChildren() == null || child
165:                                    .getChildren().isEmpty())) {
166:                        it.remove();
167:                    }
168:                }
169:
170:                if (!children.isEmpty()) {
171:                    // skip a line, except for the root dictionary
172:                    if (indentLevel > 0) {
173:                        out.println();
174:                    }
175:
176:                    out.println(padding + "{");
177:
178:                    // display the children
179:                    it = children.iterator();
180:                    while (it.hasNext()) {
181:                        Node child = (Node) it.next();
182:
183:                        printNode(out, indentLevel + 1, child);
184:
185:                        // add a semi colon for elements that are not dictionaries
186:                        Object value = child.getValue();
187:                        if (value != null && !(value instanceof  Map)
188:                                && !(value instanceof  Configuration)) {
189:                            out.println(";");
190:                        }
191:
192:                        // skip a line after arrays and dictionaries
193:                        if (it.hasNext()
194:                                && (value == null || value instanceof  List)) {
195:                            out.println();
196:                        }
197:                    }
198:
199:                    out.print(padding + "}");
200:
201:                    // line feed if the dictionary is not in an array
202:                    if (node.getParent() != null) {
203:                        out.println();
204:                    }
205:                } else {
206:                    // display the leaf value
207:                    Object value = node.getValue();
208:                    printValue(out, indentLevel, value);
209:                }
210:            }
211:
212:            /**
213:             * Append a value to the writer, indented according to a specific level.
214:             */
215:            private void printValue(PrintWriter out, int indentLevel,
216:                    Object value) {
217:                String padding = StringUtils.repeat(" ", indentLevel
218:                        * INDENT_SIZE);
219:
220:                if (value instanceof  List) {
221:                    out.print("( ");
222:                    Iterator it = ((List) value).iterator();
223:                    while (it.hasNext()) {
224:                        printValue(out, indentLevel + 1, it.next());
225:                        if (it.hasNext()) {
226:                            out.print(", ");
227:                        }
228:                    }
229:                    out.print(" )");
230:                } else if (value instanceof  HierarchicalConfiguration) {
231:                    printNode(out, indentLevel,
232:                            ((HierarchicalConfiguration) value).getRoot());
233:                } else if (value instanceof  Configuration) {
234:                    // display a flat Configuration as a dictionary
235:                    out.println();
236:                    out.println(padding + "{");
237:
238:                    Configuration config = (Configuration) value;
239:                    Iterator it = config.getKeys();
240:                    while (it.hasNext()) {
241:                        String key = (String) it.next();
242:                        Node node = new Node(key);
243:                        node.setValue(config.getProperty(key));
244:
245:                        printNode(out, indentLevel + 1, node);
246:                        out.println(";");
247:                    }
248:                    out.println(padding + "}");
249:                } else if (value instanceof  Map) {
250:                    // display a Map as a dictionary
251:                    Map map = (Map) value;
252:                    printValue(out, indentLevel, new MapConfiguration(map));
253:                } else if (value instanceof  byte[]) {
254:                    out.print("<" + new String(Hex.encodeHex((byte[]) value))
255:                            + ">");
256:                } else if (value != null) {
257:                    out.print(quoteString(String.valueOf(value)));
258:                }
259:            }
260:
261:            /**
262:             * Quote the specified string if necessary, that's if the string contains:
263:             * <ul>
264:             *   <li>a space character (' ', '\t', '\r', '\n')</li>
265:             *   <li>a quote '"'</li>
266:             *   <li>special characters in plist files ('(', ')', '{', '}', '=', ';', ',')</li>
267:             * </ul>
268:             * Quotes within the string are escaped.
269:             *
270:             * <p>Examples:</p>
271:             * <ul>
272:             *   <li>abcd -> abcd</li>
273:             *   <li>ab cd -> "ab cd"</li>
274:             *   <li>foo"bar -> "foo\"bar"</li>
275:             *   <li>foo;bar -> "foo;bar"</li>
276:             * </ul>
277:             */
278:            String quoteString(String s) {
279:                if (s == null) {
280:                    return null;
281:                }
282:
283:                if (s.indexOf(' ') != -1 || s.indexOf('\t') != -1
284:                        || s.indexOf('\r') != -1 || s.indexOf('\n') != -1
285:                        || s.indexOf('"') != -1 || s.indexOf('(') != -1
286:                        || s.indexOf(')') != -1 || s.indexOf('{') != -1
287:                        || s.indexOf('}') != -1 || s.indexOf('=') != -1
288:                        || s.indexOf(',') != -1 || s.indexOf(';') != -1) {
289:                    s = StringUtils.replace(s, "\"", "\\\"");
290:                    s = "\"" + s + "\"";
291:                }
292:
293:                return s;
294:            }
295:        }
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