Source Code Cross Referenced for LocatedException.java in  » Content-Management-System » apache-lenya-2.0 » org » apache » cocoon » util » location » 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.util.location 
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.util.location;
018:
019:        import java.lang.reflect.Method;
020:        import java.util.ArrayList;
021:        import java.util.Collections;
022:        import java.util.List;
023:
024:        import org.apache.commons.lang.exception.ExceptionUtils;
025:        import org.apache.commons.lang.exception.NestableException;
026:
027:        /**
028:         * A cascading and located <code>Exception</code>. It is also {@link MultiLocatable} to easily build
029:         * stack traces.
030:         *
031:         * @since 2.1.8
032:         * @version $Id: LocatedException.java 446917 2006-09-16 19:10:40Z vgritsenko $
033:         */
034:        public class LocatedException extends NestableException implements 
035:                LocatableException, MultiLocatable {
036:
037:            private List locations;
038:
039:            public LocatedException(String message) {
040:                this (message, null, null);
041:            }
042:
043:            public LocatedException(String message, Throwable cause) {
044:                this (message, cause, null);
045:            }
046:
047:            public LocatedException(String message, Location location) {
048:                this (message, null, location);
049:            }
050:
051:            public LocatedException(String message, Throwable cause,
052:                    Location location) {
053:                super (message, cause);
054:                ensureCauseChainIsSet(cause);
055:                addCauseLocations(this , cause);
056:                addLocation(location);
057:            }
058:
059:            private static Method INIT_CAUSE_METHOD = null;
060:            static {
061:                try {
062:                    INIT_CAUSE_METHOD = Throwable.class.getMethod("initCause",
063:                            new Class[] { Throwable.class });
064:                } catch (Exception e) {
065:                    // JDK < 1.4: ignore
066:                }
067:            }
068:
069:            /**
070:             * Crawl the cause chain and ensure causes are properly set using "initCause" on JDK >= 1.4.
071:             * This is needed because some exceptions (e.g. SAXException) don't have a getCause() that is
072:             * used to print stacktraces.
073:             */
074:            public static void ensureCauseChainIsSet(Throwable thr) {
075:                if (INIT_CAUSE_METHOD == null) {
076:                    return;
077:                }
078:
079:                // Loop either until null or encountering exceptions that use this method.
080:                while (thr != null && !(thr instanceof  LocatedRuntimeException)
081:                        && !(thr instanceof  LocatedException)) {
082:                    Throwable parent = ExceptionUtils.getCause(thr);
083:                    if (parent != null) {
084:                        try {
085:                            INIT_CAUSE_METHOD.invoke(thr,
086:                                    new Object[] { parent });
087:                        } catch (Exception e) {
088:                            // can happen if parent already set on exception
089:                        }
090:                    }
091:                    thr = parent;
092:                }
093:            }
094:
095:            /**
096:             * Add to the location stack all locations of an exception chain. This allows to have all possible
097:             * location information in the stacktrace, as some exceptions like SAXParseException don't output
098:             * their location in printStackTrace().
099:             * <p>
100:             * Traversal of the call chain stops at the first <code>Locatable</code> exception which is supposed
101:             * to handle the loction of its causes by itself.
102:             * <p>
103:             * This method is static as a convenience for {@link LocatedRuntimeException other implementations}
104:             * of locatable exceptions.
105:             *
106:             * @param self the current locatable exception
107:             * @param cause a cause of <code>self</code>
108:             */
109:            public static void addCauseLocations(MultiLocatable self,
110:                    Throwable cause) {
111:                if (cause == null || cause instanceof  Locatable) {
112:                    // Locatable handles its location itself
113:                    return;
114:                }
115:
116:                // Add parent location first
117:                addCauseLocations(self, ExceptionUtils.getCause(cause));
118:                // then ourselve's
119:                Location loc = LocationUtils.getLocation(cause);
120:                if (LocationUtils.isKnown(loc)) {
121:                    // Get the exception's short name
122:                    String name = cause.getClass().getName();
123:                    int pos = name.lastIndexOf('.');
124:                    if (pos != -1) {
125:                        name = name.substring(pos + 1);
126:                    }
127:                    loc = new LocationImpl("[" + name + "]", loc.getURI(), loc
128:                            .getLineNumber(), loc.getColumnNumber());
129:                    self.addLocation(loc);
130:                }
131:            }
132:
133:            public Location getLocation() {
134:                return locations == null ? null : (Location) locations.get(0);
135:            }
136:
137:            public List getLocations() {
138:                return locations == null ? Collections.EMPTY_LIST : locations;
139:            }
140:
141:            public String getRawMessage() {
142:                return super .getMessage();
143:            }
144:
145:            /**
146:             * Standard way of building the message of a {@link LocatableException}, as a Java-like
147:             * stack trace of locations.
148:             *
149:             * @param message the exception's message, given by <code>super.getMessage()</code> (can be null)
150:             * @param locations the location list (can be null)
151:             *
152:             * @return the message, or <code>null</code> no message and locations were given.
153:             */
154:            public static String getMessage(String message, List locations) {
155:                if (locations == null || locations.isEmpty()) {
156:                    return message;
157:                }
158:
159:                // Produce a Java-like stacktrace with locations
160:                StringBuffer buf = message == null ? new StringBuffer()
161:                        : new StringBuffer(message);
162:                for (int i = 0; i < locations.size(); i++) {
163:                    buf.append("\n\tat ")
164:                            .append(
165:                                    LocationUtils.toString((Location) locations
166:                                            .get(i)));
167:                }
168:                return buf.toString();
169:            }
170:
171:            public String getMessage() {
172:                return getMessage(super .getMessage(), locations);
173:            }
174:
175:            public void addLocation(Location loc) {
176:                if (LocationUtils.isUnknown(loc)) {
177:                    return;
178:                }
179:
180:                if (locations == null) {
181:                    this .locations = new ArrayList(1); // Start small
182:                }
183:                locations.add(LocationImpl.get(loc));
184:            }
185:        }
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