Source Code Cross Referenced for JsonWriter.java in  » J2EE » fleXive » com » flexive » war » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » fleXive » com.flexive.war 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /***************************************************************
002:         *  This file is part of the [fleXive](R) project.
003:         *
004:         *  Copyright (c) 1999-2007
005:         *  UCS - unique computing solutions gmbh (http://www.ucs.at)
006:         *  All rights reserved
007:         *
008:         *  The [fleXive](R) project is free software; you can redistribute
009:         *  it and/or modify it under the terms of the GNU General Public
010:         *  License as published by the Free Software Foundation;
011:         *  either version 2 of the License, or (at your option) any
012:         *  later version.
013:         *
014:         *  The GNU General Public License can be found at
015:         *  http://www.gnu.org/copyleft/gpl.html.
016:         *  A copy is found in the textfile GPL.txt and important notices to the
017:         *  license from the author are found in LICENSE.txt distributed with
018:         *  these libraries.
019:         *
020:         *  This library is distributed in the hope that it will be useful,
021:         *  but WITHOUT ANY WARRANTY; without even the implied warranty of
022:         *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
023:         *  GNU General Public License for more details.
024:         *
025:         *  For further information about UCS - unique computing solutions gmbh,
026:         *  please see the company website: http://www.ucs.at
027:         *
028:         *  For further information about [fleXive](R), please see the
029:         *  project website: http://www.flexive.org
030:         *
031:         *
032:         *  This copyright notice MUST APPEAR in all copies of the file!
033:         ***************************************************************/package com.flexive.war;
034:
035:        import com.flexive.shared.exceptions.FxInvalidParameterException;
036:        import com.flexive.shared.exceptions.FxInvalidStateException;
037:        import org.apache.commons.lang.StringUtils;
038:
039:        import java.io.IOException;
040:        import java.io.Writer;
041:        import java.text.DateFormat;
042:        import java.util.Collection;
043:        import java.util.Date;
044:        import java.util.Locale;
045:        import java.util.Stack;
046:
047:        /**
048:         * A simple abstraction for JSON writers, including trivial
049:         * output format checks.
050:         *
051:         * @author Daniel Lichtenberger (daniel.lichtenberger@flexive.com), UCS - unique computing solutions gmbh (http://www.ucs.at)
052:         */
053:        public class JsonWriter {
054:            /**
055:             * Current stack of "open" parentheses ([ and {)
056:             */
057:            private Stack<Character> openSet = new Stack<Character>();
058:            /**
059:             * Tracks number of written elements per level
060:             */
061:            private Stack<Integer> numElements = new Stack<Integer>();
062:            private final Writer out;
063:            private boolean attributeValueNeeded = false;
064:            private final DateFormat dateFormat;
065:
066:            /**
067:             * not completely JSON-compliant, but makes encoding XHTML much easier
068:             */
069:            private boolean singleQuotesForStrings = true;
070:
071:            public JsonWriter(Writer out) {
072:                this (out, Locale.getDefault());
073:            }
074:
075:            public JsonWriter(Writer out, Locale locale) {
076:                this .out = out;
077:                this .dateFormat = DateFormat.getDateInstance(DateFormat.MEDIUM,
078:                        locale);
079:            }
080:
081:            public JsonWriter startArray() throws IOException {
082:                writeSeparator();
083:                out.write("[");
084:                pushElement('[');
085:                attributeValueNeeded = false; // array may be value of an attribute
086:                return this ;
087:            }
088:
089:            public JsonWriter closeArray() throws IOException {
090:                checkClosingElement(']');
091:                out.write("]");
092:                popElement();
093:                return this ;
094:            }
095:
096:            public JsonWriter startMap() throws IOException {
097:                writeSeparator();
098:                out.write("{");
099:                pushElement('{');
100:                attributeValueNeeded = false; // map may be value of an attribute
101:                return this ;
102:            }
103:
104:            public JsonWriter closeMap() throws IOException {
105:                checkClosingElement('}');
106:                out.write("}");
107:                popElement();
108:                return this ;
109:            }
110:
111:            public JsonWriter startAttribute(String name) throws IOException {
112:                checkInMap();
113:                writeSeparator();
114:                out.write("\"" + name + "\":");
115:                attributeValueNeeded = true;
116:                return this ;
117:            }
118:
119:            public JsonWriter writeAttributeValue(Object value, boolean escape)
120:                    throws IOException {
121:                if (!attributeValueNeeded) {
122:                    throw new FxInvalidStateException(
123:                            "ex.json.writer.attribute.value")
124:                            .asRuntimeException();
125:                }
126:                writeValue(value, escape);
127:                attributeValueNeeded = false;
128:                return this ;
129:            }
130:
131:            public JsonWriter writeAttributeValue(Object value)
132:                    throws IOException {
133:                writeAttributeValue(value, true);
134:                return this ;
135:            }
136:
137:            public JsonWriter writeAttribute(String name, Object value)
138:                    throws IOException {
139:                startAttribute(name);
140:                writeAttributeValue(value);
141:                return this ;
142:            }
143:
144:            public JsonWriter writeAttribute(String name, Object value,
145:                    boolean escape) throws IOException {
146:                startAttribute(name);
147:                writeAttributeValue(value, escape);
148:                return this ;
149:            }
150:
151:            public JsonWriter writeLiteral(Object value) throws IOException {
152:                writeLiteral(value, true);
153:                return this ;
154:            }
155:
156:            public JsonWriter writeLiteral(Object value, boolean escapeValue)
157:                    throws IOException {
158:                checkInArray();
159:                writeSeparator();
160:                writeValue(value, escapeValue);
161:                return this ;
162:            }
163:
164:            private void writeValue(Object value, boolean escapeValue)
165:                    throws IOException {
166:                if (value instanceof  String && escapeValue) {
167:                    writeStringValue((String) value);
168:                } else if (value instanceof  Collection) {
169:                    startArray();
170:                    for (Object item : (Collection<?>) value) {
171:                        writeLiteral(item, escapeValue);
172:                    }
173:                    closeArray();
174:                } else if (value instanceof  Number) {
175:                    out.write(value.toString());
176:                } else if (value instanceof  Date) {
177:                    writeStringValue(dateFormat.format((Date) value));
178:                } else {
179:                    out.write(String.valueOf(value));
180:                }
181:            }
182:
183:            private void writeStringValue(String value) throws IOException {
184:                out.write(singleQuotesForStrings ? "'"
185:                        + StringUtils.replace(value, "'", "\\'") + "'" : "\""
186:                        + StringUtils.replace(value, "\"", "\\\"") + "\"");
187:            }
188:
189:            /**
190:             * Close the response, checking if the response is valid.
191:             * @return  this
192:             */
193:            public JsonWriter finishResponse() {
194:                if (openSet.size() > 0) {
195:                    throw new FxInvalidStateException("ex.json.writer.state",
196:                            StringUtils.join(openSet.iterator(), ','))
197:                            .asRuntimeException();
198:                }
199:                return this ;
200:            }
201:
202:            /**
203:             * Enable/disable the usage of single quotes (') for string values (default:true).
204:             * Using single quotes makes encoding of XHTML content much easier, since
205:             * XHTML attribute values have to use double quotes (").
206:             *
207:             * @param singleQuotesForStrings true to enable the usage of single quotes (') for string values
208:             * @return this
209:             */
210:            public JsonWriter setSingleQuotesForStrings(
211:                    boolean singleQuotesForStrings) {
212:                this .singleQuotesForStrings = singleQuotesForStrings;
213:                return this ;
214:            }
215:
216:            private void writeSeparator() throws IOException {
217:                if (numElements.size() > 0) {
218:                    if (numElements.lastElement() > 0 && !attributeValueNeeded) {
219:                        out.write(",");
220:                    }
221:                    numElements.set(numElements.size() - 1, numElements
222:                            .lastElement() + 1);
223:                }
224:            }
225:
226:            private void pushElement(Character element) throws IOException {
227:                openSet.push(element);
228:                numElements.push(0);
229:            }
230:
231:            private void popElement() {
232:                openSet.pop();
233:                numElements.pop();
234:            }
235:
236:            private void checkClosingElement(Character element) {
237:                if (element != ']' && element != '}') {
238:                    throw new FxInvalidParameterException("ELEMENT",
239:                            "ex.json.writer.openBracketExp")
240:                            .asRuntimeException();
241:                }
242:                if (attributeValueNeeded) {
243:                    throw new FxInvalidStateException(
244:                            "ex.json.writer.attribute.close")
245:                            .asRuntimeException();
246:                }
247:                if (openSet.size() == 0
248:                        || (element == ']' && openSet.lastElement() != '[')
249:                        || (element == '}' && openSet.lastElement() != '{')) {
250:                    throw new FxInvalidStateException(
251:                            "ex.json.writer.expected", element, openSet
252:                                    .lastElement()).asRuntimeException();
253:                }
254:            }
255:
256:            private void checkInMap() {
257:                if (openSet.size() == 0 || openSet.lastElement() != '{') {
258:                    throw new FxInvalidStateException(
259:                            "ex.json.writer.attribute.map")
260:                            .asRuntimeException();
261:                }
262:            }
263:
264:            private void checkInArray() {
265:                if (openSet.size() == 0 || openSet.lastElement() != '[') {
266:                    throw new FxInvalidStateException(
267:                            "ex.json.writer.attribute.array")
268:                            .asRuntimeException();
269:                }
270:            }
271:
272:        }
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