Source Code Cross Referenced for SVGSerializer.java in  » Content-Management-System » apache-lenya-2.0 » org » apache » cocoon » serialization » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Content Management System » apache lenya 2.0 » org.apache.cocoon.serialization 
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:        package org.apache.cocoon.serialization;
018:
019:        import java.awt.Color;
020:        import java.io.OutputStream;
021:        import java.io.Serializable;
022:
023:        import org.apache.avalon.framework.configuration.Configurable;
024:        import org.apache.avalon.framework.configuration.Configuration;
025:        import org.apache.avalon.framework.configuration.ConfigurationException;
026:        import org.apache.avalon.framework.context.Context;
027:        import org.apache.avalon.framework.context.ContextException;
028:        import org.apache.avalon.framework.context.Contextualizable;
029:        import org.apache.batik.transcoder.Transcoder;
030:        import org.apache.batik.transcoder.TranscoderInput;
031:        import org.apache.batik.transcoder.TranscoderOutput;
032:        import org.apache.batik.transcoder.TranscodingHints;
033:        import org.apache.batik.transcoder.TranscoderException;
034:        import org.apache.batik.util.ParsedURL;
035:        import org.apache.cocoon.Constants;
036:        import org.apache.cocoon.caching.CacheableProcessingComponent;
037:        import org.apache.cocoon.components.transcoder.ExtendableTranscoderFactory;
038:        import org.apache.cocoon.components.transcoder.TranscoderFactory;
039:        import org.apache.cocoon.components.url.ParsedContextURLProtocolHandler;
040:        import org.apache.cocoon.components.url.ParsedResourceURLProtocolHandler;
041:        import org.apache.cocoon.util.ClassUtils;
042:        import org.apache.cocoon.xml.dom.SVGBuilder;
043:        import org.apache.commons.lang.BooleanUtils;
044:        import org.apache.excalibur.source.SourceValidity;
045:        import org.apache.excalibur.source.impl.validity.NOPValidity;
046:        import org.w3c.dom.Document;
047:        import org.xml.sax.SAXException;
048:
049:        /**
050:         * A <a href="http://xml.apache.org/batik/">Batik</a> based Serializer for generating PNG/JPEG images
051:         *
052:         * @author <a href="mailto:dims@yahoo.com">Davanum Srinivas</a>
053:         * @author <a href="mailto:rossb@apache.org">Ross Burton</a>
054:         * @version $Id: SVGSerializer.java 433543 2006-08-22 06:22:54Z crossley $
055:         */
056:        public class SVGSerializer extends SVGBuilder implements  Serializer,
057:                Configurable, CacheableProcessingComponent, Contextualizable {
058:
059:            /**
060:             * Get the context
061:             */
062:            public void contextualize(Context context) throws ContextException {
063:                ParsedContextURLProtocolHandler
064:                        .setContext((org.apache.cocoon.environment.Context) context
065:                                .get(Constants.CONTEXT_ENVIRONMENT_CONTEXT));
066:                ParsedURL
067:                        .registerHandler(new ParsedContextURLProtocolHandler());
068:                ParsedURL
069:                        .registerHandler(new ParsedResourceURLProtocolHandler());
070:            }
071:
072:            /** The current <code>OutputStream</code>. */
073:            private OutputStream output;
074:
075:            /** The current <code>mime-type</code>. */
076:            private String mimetype;
077:
078:            /** The current <code>Transcoder</code>.  */
079:            Transcoder transcoder;
080:
081:            /** The Transcoder Factory to use */
082:            TranscoderFactory factory = ExtendableTranscoderFactory
083:                    .getTranscoderFactoryImplementation();
084:
085:            //    private ServiceManager manager;
086:
087:            //    private SourceResolver resolver;
088:
089:            /**
090:             * Set the <code>OutputStream</code> where the XML should be serialized.
091:             */
092:            public void setOutputStream(OutputStream out) {
093:                this .output = out;
094:
095:                // Give the source resolver to Batik
096:                //SourceProtocolHandler.setup(this.resolver);
097:            }
098:
099:            /*    public void service(ServiceManager manager) throws ServiceException {
100:             this.manager = manager;
101:             this.resolver = (SourceResolver)this.manager.lookup(SourceResolver.ROLE);
102:             }
103:
104:             public void dispose() {
105:             this.manager.release(this.resolver);
106:             }
107:             */
108:            /**
109:             * Set the configurations for this serializer.
110:             */
111:            public void configure(Configuration conf)
112:                    throws ConfigurationException {
113:                this .mimetype = conf.getAttribute("mime-type");
114:                if (getLogger().isDebugEnabled()) {
115:                    getLogger().debug("mime-type: " + mimetype);
116:                }
117:
118:                // Using the Transcoder Factory, get the default transcoder
119:                // for this MIME type.
120:                this .transcoder = factory.createTranscoder(mimetype);
121:
122:                // Iterate through the parameters, looking for a transcoder reference
123:                Configuration[] parameters = conf.getChildren("parameter");
124:                for (int i = 0; i < parameters.length; i++) {
125:                    String name = parameters[i].getAttribute("name");
126:                    if ("transcoder".equals(name)) {
127:                        String transcoderName = parameters[i]
128:                                .getAttribute("value");
129:                        try {
130:                            this .transcoder = (Transcoder) ClassUtils
131:                                    .newInstance(transcoderName);
132:                        } catch (Exception ex) {
133:                            if (getLogger().isDebugEnabled()) {
134:                                getLogger().debug(
135:                                        "Cannot load  class " + transcoderName,
136:                                        ex);
137:                            }
138:                            throw new ConfigurationException(
139:                                    "Cannot load class " + transcoderName, ex);
140:                        }
141:                    }
142:                }
143:                // Do we have a transcoder yet?
144:                if (this .transcoder == null) {
145:                    throw new ConfigurationException(
146:                            "Could not autodetect transcoder for SVGSerializer and "
147:                                    + "no transcoder was specified in the sitemap configuration.");
148:                }
149:
150:                // Now run through the other parameters, using them as hints
151:                // to the transcoder
152:                for (int i = 0; i < parameters.length; i++) {
153:                    String name = parameters[i].getAttribute("name");
154:                    // Skip over the parameters we've dealt with. Ensure this
155:                    // is kept in sync with the above list!
156:                    if ("transcoder".equals(name)) {
157:                        continue;
158:                    }
159:
160:                    // Now try and get the hints out
161:                    try {
162:                        // Turn it into a key name (assume the current Batik style continues!
163:                        name = ("KEY_" + name).toUpperCase();
164:                        // Use reflection to get a reference to the key object
165:                        TranscodingHints.Key key = (TranscodingHints.Key) (transcoder
166:                                .getClass().getField(name).get(transcoder));
167:                        Object value;
168:                        String keyType = parameters[i].getAttribute("type",
169:                                "STRING").toUpperCase();
170:                        if ("FLOAT".equals(keyType)) {
171:                            // Can throw an exception.
172:                            value = new Float(parameters[i]
173:                                    .getAttributeAsFloat("value"));
174:                        } else if ("INTEGER".equals(keyType)) {
175:                            // Can throw an exception.
176:                            value = new Integer(parameters[i]
177:                                    .getAttributeAsInteger("value"));
178:                        } else if ("BOOLEAN".equals(keyType)) {
179:                            // Can throw an exception.
180:                            value = BooleanUtils.toBooleanObject(parameters[i]
181:                                    .getAttributeAsBoolean("value"));
182:                        } else if ("COLOR".equals(keyType)) {
183:                            // Can throw an exception
184:                            String stringValue = parameters[i]
185:                                    .getAttribute("value");
186:                            if (stringValue.startsWith("#")) {
187:                                stringValue = stringValue.substring(1);
188:                            }
189:                            value = new Color(Integer.parseInt(stringValue, 16));
190:                        } else {
191:                            // Assume String, and get the value. Allow an empty string.
192:                            value = parameters[i].getAttribute("value", "");
193:                        }
194:                        if (getLogger().isDebugEnabled()) {
195:                            getLogger().debug(
196:                                    "Adding hint \"" + name
197:                                            + "\" with value \""
198:                                            + value.toString() + "\"");
199:                        }
200:                        transcoder.addTranscodingHint(key, value);
201:                    } catch (ClassCastException ex) {
202:                        // This is only thrown from the String keyType... line
203:                        throw new ConfigurationException("Specified key ("
204:                                + name
205:                                + ") is not a valid Batik Transcoder key.", ex);
206:                    } catch (ConfigurationException ex) {
207:                        throw new ConfigurationException(
208:                                "Name or value not specified.", ex);
209:                    } catch (IllegalAccessException ex) {
210:                        throw new ConfigurationException(
211:                                "Cannot access the key for parameter \"" + name
212:                                        + "\"", ex);
213:                    } catch (NoSuchFieldException ex) {
214:                        throw new ConfigurationException(
215:                                "No field available for parameter \"" + name
216:                                        + "\"", ex);
217:                    }
218:                }
219:            }
220:
221:            /**
222:             * Receive notification of a successfully completed DOM tree generation.
223:             */
224:            public void notify(Document doc) throws SAXException {
225:
226:                try {
227:                    TranscoderInput transInput = new TranscoderInput(doc);
228:
229:                    // Buffering is done by the pipeline (See shouldSetContentLength)
230:                    TranscoderOutput transOutput = new TranscoderOutput(
231:                            this .output);
232:                    transcoder.transcode(transInput, transOutput);
233:                } catch (TranscoderException ex) {
234:                    if (ex.getException() != null) {
235:                        if (getLogger().isDebugEnabled()) {
236:                            getLogger()
237:                                    .debug(
238:                                            "Got transcoder exception writing image, rethrowing nested exception",
239:                                            ex);
240:                        }
241:                        throw new SAXException("Exception writing image", ex
242:                                .getException());
243:                    }
244:
245:                    if (getLogger().isDebugEnabled()) {
246:                        getLogger()
247:                                .debug(
248:                                        "Got transcoder exception writing image, rethrowing",
249:                                        ex);
250:                    }
251:                    throw new SAXException("Exception writing image", ex);
252:                } catch (Exception ex) {
253:                    if (getLogger().isDebugEnabled()) {
254:                        getLogger().debug(
255:                                "Got exception writing image, rethrowing", ex);
256:                    }
257:                    throw new SAXException("Exception writing image", ex);
258:                }
259:            }
260:
261:            /**
262:             * Return the MIME type.
263:             */
264:            public String getMimeType() {
265:                return mimetype;
266:            }
267:
268:            /**
269:             * Generate the unique key.
270:             * This key must be unique inside the space of this component.
271:             * This method must be invoked before the getValidity() method.
272:             *
273:             * @return The generated key or <code>0</code> if the component
274:             *              is currently not cacheable.
275:             */
276:            public Serializable getKey() {
277:                return "1";
278:            }
279:
280:            /**
281:             * Generate the validity object.
282:             * Before this method can be invoked the getKey() method
283:             * must be invoked.
284:             *
285:             * @return The generated validity object or <code>null</code> if the
286:             *         component is currently not cacheable.
287:             */
288:            public SourceValidity getValidity() {
289:                return NOPValidity.SHARED_INSTANCE;
290:            }
291:
292:            /**
293:             * Returns true so the pipeline implementation will buffer generated
294:             * output and write content length to the response.
295:             * <p>Batik's PNGTranscoder closes the output stream, therefore we
296:             * cannot pass the output stream directly to Batik and have to
297:             * instruct pipeline to buffer it. If we do not buffer, we would get
298:             * an exception when
299:             * {@link org.apache.cocoon.Cocoon#process(org.apache.cocoon.environment.Environment)}
300:             * tries to close the stream.
301:             */
302:            public boolean shouldSetContentLength() {
303:                return true;
304:            }
305:        }
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