Source Code Cross Referenced for Loader.java in  » 6.0-JDK-Modules » jaxb-impl » com » sun » xml » bind » v2 » runtime » unmarshaller » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » jaxb impl » com.sun.xml.bind.v2.runtime.unmarshaller 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
003:         * 
004:         * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
005:         * 
006:         * The contents of this file are subject to the terms of either the GNU
007:         * General Public License Version 2 only ("GPL") or the Common Development
008:         * and Distribution License("CDDL") (collectively, the "License").  You
009:         * may not use this file except in compliance with the License. You can obtain
010:         * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
011:         * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
012:         * language governing permissions and limitations under the License.
013:         * 
014:         * When distributing the software, include this License Header Notice in each
015:         * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
016:         * Sun designates this particular file as subject to the "Classpath" exception
017:         * as provided by Sun in the GPL Version 2 section of the License file that
018:         * accompanied this code.  If applicable, add the following below the License
019:         * Header, with the fields enclosed by brackets [] replaced by your own
020:         * identifying information: "Portions Copyrighted [year]
021:         * [name of copyright owner]"
022:         * 
023:         * Contributor(s):
024:         * 
025:         * If you wish your version of this file to be governed by only the CDDL or
026:         * only the GPL Version 2, indicate your decision by adding "[Contributor]
027:         * elects to include this software in this distribution under the [CDDL or GPL
028:         * Version 2] license."  If you don't indicate a single choice of license, a
029:         * recipient has the option to distribute your version of this file under
030:         * either the CDDL, the GPL Version 2 or to extend the choice of license to
031:         * its licensees as provided above.  However, if you add GPL Version 2 code
032:         * and therefore, elected the GPL Version 2 license, then the option applies
033:         * only if the new code is made subject to such option by the copyright
034:         * holder.
035:         */
036:
037:        package com.sun.xml.bind.v2.runtime.unmarshaller;
038:
039:        import java.util.Collection;
040:        import java.util.Collections;
041:
042:        import javax.xml.bind.Unmarshaller;
043:        import javax.xml.bind.ValidationEvent;
044:        import javax.xml.bind.helpers.ValidationEventImpl;
045:        import javax.xml.namespace.QName;
046:
047:        import com.sun.xml.bind.v2.runtime.JaxBeanInfo;
048:
049:        import org.xml.sax.SAXException;
050:
051:        /**
052:         * @author Kohsuke Kawaguchi
053:         */
054:        public abstract class Loader {
055:
056:            // allow derived classes to change it later
057:            protected boolean expectText;
058:
059:            protected Loader(boolean expectText) {
060:                this .expectText = expectText;
061:            }
062:
063:            protected Loader() {
064:            }
065:
066:            //
067:            //
068:            //
069:            // Contract
070:            //
071:            //
072:            //
073:            /**
074:             * Called when the loader is activated, which is when a new start tag is seen
075:             * and when the parent designated this loader as the child loader.
076:             *
077:             * <p>
078:             * The callee may change <tt>state.loader</tt> to designate another {@link Loader}
079:             * for the processing. It's the responsibility of the callee to forward the startElement
080:             * event in such a case.
081:             *
082:             * @param ea
083:             *      info about the start tag. never null.
084:             */
085:            public void startElement(UnmarshallingContext.State state,
086:                    TagName ea) throws SAXException {
087:            }
088:
089:            /**
090:             * Called when this loaderis an active loaderand we see a new child start tag.
091:             *
092:             * <p>
093:             * The callee is expected to designate another loaderas a loaderthat processes
094:             * this element, then it should also register a {@link Receiver}.
095:             * The designated loaderwill become an active loader.
096:             *
097:             * <p>
098:             * The default implementation reports an error saying an element is unexpected.
099:             */
100:            public void childElement(UnmarshallingContext.State state,
101:                    TagName ea) throws SAXException {
102:                // notify the error, then recover by ignoring the whole element.
103:                reportUnexpectedChildElement(ea, true);
104:                state.loader = Discarder.INSTANCE;
105:                state.receiver = null;
106:            }
107:
108:            @SuppressWarnings({"StringEquality"})
109:            protected final void reportUnexpectedChildElement(TagName ea,
110:                    boolean canRecover) throws SAXException {
111:                if (canRecover
112:                        && !UnmarshallingContext.getInstance().parent
113:                                .hasEventHandler())
114:                    // this error happens particurly often (when input documents contain a lot of unexpected elements to be ignored),
115:                    // so don't bother computing all the messages and etc if we know that
116:                    // there's no event handler to receive the error in the end. See #286 
117:                    return;
118:                if (ea.uri != ea.uri.intern() || ea.local != ea.local.intern())
119:                    reportError(Messages.UNINTERNED_STRINGS.format(),
120:                            canRecover);
121:                else
122:                    reportError(Messages.UNEXPECTED_ELEMENT.format(ea.uri,
123:                            ea.local, computeExpectedElements()), canRecover);
124:            }
125:
126:            /**
127:             * Returns a set of tag names expected as possible child elements in this context.
128:             */
129:            public Collection<QName> getExpectedChildElements() {
130:                return Collections.emptyList();
131:            }
132:
133:            /**
134:             * Called when this loaderis an active loaderand we see a chunk of text.
135:             *
136:             * The runtime makes sure that adjacent characters (even those separated
137:             * by comments, PIs, etc) are reported as one event.
138:             * IOW, you won't see two text event calls in a row.
139:             */
140:            public void text(UnmarshallingContext.State state, CharSequence text)
141:                    throws SAXException {
142:                // make str printable
143:                text = text.toString().replace('\r', ' ').replace('\n', ' ')
144:                        .replace('\t', ' ').trim();
145:                reportError(Messages.UNEXPECTED_TEXT.format(text), true);
146:            }
147:
148:            /**
149:             * True if this loader expects the {@link #text(UnmarshallingContext.State, CharSequence)} method
150:             * to be called. False otherwise.
151:             */
152:            public final boolean expectText() {
153:                return expectText;
154:            }
155:
156:            /**
157:             * Called when this loaderis an active loaderand we see an end tag.
158:             */
159:            public void leaveElement(UnmarshallingContext.State state,
160:                    TagName ea) throws SAXException {
161:            }
162:
163:            //
164:            //
165:            //
166:            // utility methods
167:            //
168:            //
169:            //
170:            /**
171:             * Computes the names of possible root elements for a better error diagnosis.
172:             */
173:            private String computeExpectedElements() {
174:                StringBuilder r = new StringBuilder();
175:
176:                for (QName n : getExpectedChildElements()) {
177:                    if (r.length() != 0)
178:                        r.append(',');
179:                    r.append("<{").append(n.getNamespaceURI()).append('}')
180:                            .append(n.getLocalPart()).append('>');
181:                }
182:                if (r.length() == 0) {
183:                    return "(none)";
184:                }
185:
186:                return r.toString();
187:            }
188:
189:            /**
190:             * Fires the beforeUnmarshal event if necessary.
191:             *
192:             * @param state
193:             *      state of the newly create child object.
194:             */
195:            protected final void fireBeforeUnmarshal(JaxBeanInfo beanInfo,
196:                    Object child, UnmarshallingContext.State state)
197:                    throws SAXException {
198:                if (beanInfo.lookForLifecycleMethods()) {
199:                    UnmarshallingContext context = state.getContext();
200:                    Unmarshaller.Listener listener = context.parent
201:                            .getListener();
202:                    if (beanInfo.hasBeforeUnmarshalMethod()) {
203:                        beanInfo.invokeBeforeUnmarshalMethod(context.parent,
204:                                child, state.prev.target);
205:                    }
206:                    if (listener != null) {
207:                        listener.beforeUnmarshal(child, state.prev.target);
208:                    }
209:                }
210:            }
211:
212:            /**
213:             * Fires the afterUnmarshal event if necessary.
214:             *
215:             * @param state
216:             *      state of the parent object
217:             */
218:            protected final void fireAfterUnmarshal(JaxBeanInfo beanInfo,
219:                    Object child, UnmarshallingContext.State state)
220:                    throws SAXException {
221:                // fire the event callback
222:                if (beanInfo.lookForLifecycleMethods()) {
223:                    UnmarshallingContext context = state.getContext();
224:                    Unmarshaller.Listener listener = context.parent
225:                            .getListener();
226:                    if (beanInfo.hasAfterUnmarshalMethod()) {
227:                        beanInfo.invokeAfterUnmarshalMethod(context.parent,
228:                                child, state.target);
229:                    }
230:                    if (listener != null)
231:                        listener.afterUnmarshal(child, state.target);
232:                }
233:            }
234:
235:            /**
236:             * Last resort when something goes terribly wrong within the unmarshaller.
237:             */
238:            protected static void handleGenericException(Exception e)
239:                    throws SAXException {
240:                handleGenericException(e, false);
241:            }
242:
243:            public static void handleGenericException(Exception e,
244:                    boolean canRecover) throws SAXException {
245:                reportError(e.getMessage(), e, canRecover);
246:            }
247:
248:            protected static void reportError(String msg, boolean canRecover)
249:                    throws SAXException {
250:                reportError(msg, null, canRecover);
251:            }
252:
253:            public static void reportError(String msg, Exception nested,
254:                    boolean canRecover) throws SAXException {
255:                UnmarshallingContext context = UnmarshallingContext
256:                        .getInstance();
257:                context.handleEvent(new ValidationEventImpl(
258:                        canRecover ? ValidationEvent.ERROR
259:                                : ValidationEvent.FATAL_ERROR, msg, context
260:                                .getLocator().getLocation(), nested),
261:                        canRecover);
262:            }
263:
264:            /**
265:             * This method is called by the generated derived class
266:             * when a datatype parse method throws an exception.
267:             */
268:            protected static void handleParseConversionException(
269:                    UnmarshallingContext.State state, Exception e)
270:                    throws SAXException {
271:                // wrap it into a ParseConversionEvent and report it
272:                state.getContext().handleError(e);
273:            }
274:        }
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