Source Code Cross Referenced for FOPSerializer.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.io.File;
020:        import java.io.OutputStream;
021:        import java.io.Serializable;
022:        import java.net.MalformedURLException;
023:        import java.util.Map;
024:        import java.util.HashMap;
025:
026:        import org.apache.avalon.framework.CascadingRuntimeException;
027:        import org.apache.avalon.framework.configuration.Configurable;
028:        import org.apache.avalon.framework.configuration.Configuration;
029:        import org.apache.avalon.framework.configuration.ConfigurationException;
030:        import org.apache.avalon.framework.logger.Logger;
031:        import org.apache.avalon.framework.service.ServiceException;
032:        import org.apache.avalon.framework.service.ServiceManager;
033:        import org.apache.avalon.framework.service.Serviceable;
034:        import org.apache.cocoon.caching.CacheableProcessingComponent;
035:        import org.apache.cocoon.components.renderer.ExtendableRendererFactory;
036:        import org.apache.cocoon.components.renderer.RendererFactory;
037:        import org.apache.cocoon.components.source.SourceUtil;
038:        import org.apache.cocoon.util.ClassUtils;
039:        import org.apache.excalibur.source.Source;
040:        import org.apache.excalibur.source.SourceResolver;
041:        import org.apache.excalibur.source.SourceValidity;
042:        import org.apache.excalibur.source.impl.validity.NOPValidity;
043:        import org.apache.fop.apps.Driver;
044:        import org.apache.fop.apps.Options;
045:        import org.apache.fop.configuration.ConfigurationParser;
046:        import org.apache.fop.messaging.MessageHandler;
047:        import org.apache.fop.render.Renderer;
048:
049:        /**
050:         * @author ?
051:         * @author <a href="mailto:vgritsenko@apache.org">Vadim Gritsenko</a>
052:         * @version CVS $Id: FOPSerializer.java 433543 2006-08-22 06:22:54Z crossley $
053:         */
054:        public class FOPSerializer extends AbstractSerializer implements 
055:                Configurable, CacheableProcessingComponent, Serviceable/*, Disposable */{
056:
057:            //protected SourceResolver resolver;
058:
059:            /**
060:             * The Renderer Factory to use
061:             */
062:            protected final static RendererFactory factory = ExtendableRendererFactory
063:                    .getRendererFactoryImplementation();
064:
065:            /**
066:             * The <code>Driver</code> which is FOP.
067:             */
068:            protected Driver driver;
069:
070:            /**
071:             * The current <code>Renderer</code>.
072:             */
073:            protected Renderer renderer;
074:
075:            /**
076:             * The current <code>mime-type</code>.
077:             */
078:            protected String mimetype;
079:
080:            /**
081:             * The renderer name if configured
082:             */
083:            protected String rendererName;
084:
085:            /**
086:             * Should we set the content length ?
087:             */
088:            protected boolean setContentLength = true;
089:
090:            /**
091:             * This logger is used for FOP
092:             */
093:            protected Logger logger;
094:
095:            /**
096:             * It is used to make sure that default Options loaded only once.
097:             */
098:            private static boolean configured = false;
099:
100:            /**
101:             * Manager to get URLFactory from.
102:             */
103:            protected ServiceManager manager;
104:
105:            /**
106:             * Set the component manager for this serializer.
107:             */
108:            public void service(ServiceManager manager) throws ServiceException {
109:                this .manager = manager;
110:                //this.resolver = (SourceResolver)this.manager.lookup(SourceResolver.ROLE);
111:            }
112:
113:            /*
114:             public void dispose() {
115:             this.manager.release(this.resolver);
116:             }
117:             */
118:            /**
119:             * Set the configurations for this serializer.
120:             */
121:            public void configure(Configuration conf)
122:                    throws ConfigurationException {
123:
124:                this .logger = getLogger().getChildLogger("fop");
125:                MessageHandler.setScreenLogger(this .logger);
126:
127:                // FIXME: VG: Initialize static FOP configuration with defaults, only once.
128:                // FOP has static config, but that's going to change in the near future.
129:                // Then this code should be reviewed.
130:                synchronized (FOPSerializer.class) {
131:                    if (!configured) {
132:                        try {
133:                            if (getLogger().isDebugEnabled()) {
134:                                getLogger().debug(
135:                                        "Loading default configuration");
136:                            }
137:                            new Options();
138:                        } catch (Exception e) {
139:                            getLogger()
140:                                    .error(
141:                                            "Cannot load default configuration. Proceeding.",
142:                                            e);
143:                        }
144:                        configured = true;
145:                    }
146:                }
147:
148:                this .setContentLength = conf.getChild("set-content-length")
149:                        .getValueAsBoolean(true);
150:
151:                // Old syntax: Attribute src of element user-config contains file
152:                String configUrl = conf.getChild("user-config").getAttribute(
153:                        "src", null);
154:                if (configUrl != null) {
155:                    getLogger()
156:                            .warn(
157:                                    "Attribute src of user-config element is deprecated. "
158:                                            + "Provide Cocoon URI as value of the element instead");
159:                    try {
160:                        // VG: Old version of serializer supported only files
161:                        configUrl = new File(configUrl).toURL()
162:                                .toExternalForm();
163:                    } catch (MalformedURLException e) {
164:                        getLogger().warn(
165:                                "Can not load config file " + configUrl, e);
166:                        configUrl = null;
167:                    }
168:                } else {
169:                    // New syntax: Element user-config contains URL
170:                    configUrl = conf.getChild("user-config").getValue(null);
171:                }
172:
173:                if (configUrl != null) {
174:                    Source configSource = null;
175:                    SourceResolver resolver = null;
176:                    try {
177:                        resolver = (SourceResolver) this .manager
178:                                .lookup(SourceResolver.ROLE);
179:                        configSource = resolver.resolveURI(configUrl);
180:                        if (getLogger().isDebugEnabled()) {
181:                            getLogger().debug(
182:                                    "Loading configuration from "
183:                                            + configSource.getURI());
184:                        }
185:                        SourceUtil.toSAX(configSource,
186:                                new ConfigurationParser());
187:                    } catch (Exception e) {
188:                        getLogger().warn(
189:                                "Cannot load configuration from " + configUrl);
190:                        throw new ConfigurationException(
191:                                "Cannot load configuration from " + configUrl,
192:                                e);
193:                    } finally {
194:                        if (resolver != null) {
195:                            resolver.release(configSource);
196:                            manager.release(resolver);
197:                        }
198:                    }
199:                }
200:
201:                // Get the mime type.
202:                this .mimetype = conf.getAttribute("mime-type");
203:
204:                // Iterate through the parameters, looking for a renderer reference
205:                Configuration[] parameters = conf.getChildren("parameter");
206:                for (int i = 0; i < parameters.length; i++) {
207:                    String name = parameters[i].getAttribute("name");
208:                    if ("renderer".equals(name)) {
209:                        this .rendererName = parameters[i].getAttribute("value");
210:                        try {
211:                            this .renderer = (Renderer) ClassUtils
212:                                    .newInstance(rendererName);
213:                        } catch (Exception ex) {
214:                            getLogger().error(
215:                                    "Cannot load  class " + rendererName, ex);
216:                            throw new ConfigurationException(
217:                                    "Cannot load class " + rendererName, ex);
218:                        }
219:                    }
220:                }
221:                if (this .renderer == null) {
222:                    // Using the Renderer Factory, get the default renderer
223:                    // for this MIME type.
224:                    this .renderer = factory.createRenderer(mimetype);
225:                }
226:
227:                // Do we have a renderer yet?
228:                if (this .renderer == null) {
229:                    throw new ConfigurationException(
230:                            "Could not autodetect renderer for FOPSerializer and "
231:                                    + "no renderer was specified in the sitemap configuration.");
232:                }
233:
234:                Configuration confRenderer = conf.getChild("renderer-config");
235:                if (confRenderer != null) {
236:                    parameters = confRenderer.getChildren("parameter");
237:                    if (parameters.length > 0) {
238:                        Map rendererOptions = new HashMap();
239:                        for (int i = 0; i < parameters.length; i++) {
240:                            String name = parameters[i].getAttribute("name");
241:                            String value = parameters[i].getAttribute("value");
242:
243:                            if (getLogger().isDebugEnabled()) {
244:                                getLogger()
245:                                        .debug(
246:                                                "renderer "
247:                                                        + String.valueOf(name)
248:                                                        + " = "
249:                                                        + String.valueOf(value));
250:                            }
251:                            rendererOptions.put(name, value);
252:                        }
253:                        this .renderer.setOptions(rendererOptions);
254:                    }
255:                }
256:            }
257:
258:            /**
259:             * Return the MIME type.
260:             */
261:            public String getMimeType() {
262:                return mimetype;
263:            }
264:
265:            /**
266:             * Create the FOP driver
267:             * Set the <code>OutputStream</code> where the XML should be serialized.
268:             */
269:            public void setOutputStream(OutputStream out) {
270:
271:                // Give the source resolver to Batik which is used by FOP
272:                //SourceProtocolHandler.setup(this.resolver);
273:
274:                // load the fop driver
275:                this .driver = new Driver();
276:                this .driver.setLogger(this .logger);
277:                if (this .rendererName == null) {
278:                    this .renderer = factory.createRenderer(mimetype);
279:                } else {
280:                    try {
281:                        this .renderer = (Renderer) ClassUtils
282:                                .newInstance(this .rendererName);
283:                    } catch (Exception e) {
284:                        if (getLogger().isWarnEnabled()) {
285:                            getLogger()
286:                                    .warn(
287:                                            "Cannot load class "
288:                                                    + this .rendererName, e);
289:                        }
290:                        throw new CascadingRuntimeException(
291:                                "Cannot load class " + this .rendererName, e);
292:                    }
293:                }
294:                this .driver.setRenderer(this .renderer);
295:                this .driver.setOutputStream(out);
296:                setContentHandler(this .driver.getContentHandler());
297:            }
298:
299:            /**
300:             * Generate the unique key.
301:             * This key must be unique inside the space of this component.
302:             * This method must be invoked before the generateValidity() method.
303:             *
304:             * @return The generated key or <code>0</code> if the component
305:             *              is currently not cacheable.
306:             */
307:            public Serializable getKey() {
308:                return "1";
309:            }
310:
311:            /**
312:             * Generate the validity object.
313:             * Before this method can be invoked the generateKey() method
314:             * must be invoked.
315:             *
316:             * @return The generated validity object or <code>null</code> if the
317:             *         component is currently not cacheable.
318:             */
319:            public SourceValidity getValidity() {
320:                return NOPValidity.SHARED_INSTANCE;
321:            }
322:
323:            /**
324:             * Recycle serializer by removing references
325:             */
326:            public void recycle() {
327:                super .recycle();
328:                this .driver = null;
329:                this .renderer = null;
330:            }
331:
332:            /**
333:             * Test if the component wants to set the content length
334:             */
335:            public boolean shouldSetContentLength() {
336:                return this.setContentLength;
337:            }
338:
339:        }
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