Source Code Cross Referenced for NestedCheckedException.java in  » J2EE » spring-framework-2.0.6 » org » springframework » core » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » spring framework 2.0.6 » org.springframework.core 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 2002-2007 the original author or authors.
003:         *
004:         * Licensed under the Apache License, Version 2.0 (the "License");
005:         * you may not use this file except in compliance with the License.
006:         * You may obtain a copy of the License at
007:         *
008:         *      http://www.apache.org/licenses/LICENSE-2.0
009:         *
010:         * Unless required by applicable law or agreed to in writing, software
011:         * distributed under the License is distributed on an "AS IS" BASIS,
012:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013:         * See the License for the specific language governing permissions and
014:         * limitations under the License.
015:         */
016:
017:        package org.springframework.core;
018:
019:        import java.io.PrintStream;
020:        import java.io.PrintWriter;
021:
022:        /**
023:         * Handy class for wrapping checked <code>Exceptions</code> with a root cause.
024:         *
025:         * <p>This time-honored technique is no longer necessary in Java 1.4, which
026:         * finally provides built-in support for exception nesting. Thus exceptions in
027:         * applications written to use Java 1.4 need not extend this class. To ease
028:         * migration, this class mirrors Java 1.4's nested exceptions as closely as possible.
029:         *
030:         * <p>This class is <code>abstract</code> to force the programmer to extend
031:         * the class. <code>getMessage</code> will include nested exception
032:         * information; <code>printStackTrace</code> and other like methods will
033:         * delegate to the wrapped exception, if any.
034:         *
035:         * <p>The similarity between this class and the {@link NestedRuntimeException}
036:         * class is unavoidable, as Java forces these two classes to have different
037:         * superclasses (ah, the inflexibility of concrete inheritance!).
038:         *
039:         * @author Rod Johnson
040:         * @author Juergen Hoeller
041:         * @see #getMessage
042:         * @see #printStackTrace
043:         * @see NestedRuntimeException
044:         */
045:        public abstract class NestedCheckedException extends Exception {
046:
047:            /** Use serialVersionUID from Spring 1.2 for interoperability */
048:            private static final long serialVersionUID = 7100714597678207546L;
049:
050:            /** Root cause of this nested exception */
051:            private Throwable cause;
052:
053:            /**
054:             * Construct a <code>NestedCheckedException</code> with the specified detail message.
055:             * @param msg the detail message
056:             */
057:            public NestedCheckedException(String msg) {
058:                super (msg);
059:            }
060:
061:            /**
062:             * Construct a <code>NestedCheckedException</code> with the specified detail message
063:             * and nested exception.
064:             * @param msg the detail message
065:             * @param cause the nested exception
066:             */
067:            public NestedCheckedException(String msg, Throwable cause) {
068:                super (msg);
069:                this .cause = cause;
070:            }
071:
072:            /**
073:             * Return the nested cause, or <code>null</code> if none.
074:             * <p>Note that this will only check one level of nesting.
075:             * Use {@link #getRootCause()} to retrieve the innermost cause.
076:             */
077:            public Throwable getCause() {
078:                // Even if you cannot set the cause of this exception other than through
079:                // the constructor, we check for the cause being "this" here, as the cause
080:                // could still be set to "this" via reflection: for example, by a remoting
081:                // deserializer like Hessian's.
082:                return (this .cause == this  ? null : this .cause);
083:            }
084:
085:            /**
086:             * Return the detail message, including the message from the nested exception
087:             * if there is one.
088:             */
089:            public String getMessage() {
090:                return NestedExceptionUtils.buildMessage(super .getMessage(),
091:                        getCause());
092:            }
093:
094:            /**
095:             * Print the composite message and the embedded stack trace to the specified stream.
096:             * @param ps the print stream
097:             */
098:            public void printStackTrace(PrintStream ps) {
099:                if (getCause() == null) {
100:                    super .printStackTrace(ps);
101:                } else {
102:                    ps.println(this );
103:                    ps.print("Caused by: ");
104:                    getCause().printStackTrace(ps);
105:                }
106:            }
107:
108:            /**
109:             * Print the composite message and the embedded stack trace to the specified print writer.
110:             * @param pw the print writer
111:             */
112:            public void printStackTrace(PrintWriter pw) {
113:                if (getCause() == null) {
114:                    super .printStackTrace(pw);
115:                } else {
116:                    pw.println(this );
117:                    pw.print("Caused by: ");
118:                    getCause().printStackTrace(pw);
119:                }
120:            }
121:
122:            /**
123:             * Retrieve the innermost cause of this exception, if any.
124:             * <p>Currently just traverses NestedCheckedException causes. Will use
125:             * the JDK 1.4 exception cause mechanism once Spring requires JDK 1.4.
126:             * @return the innermost exception, or <code>null</code> if none
127:             */
128:            public Throwable getRootCause() {
129:                Throwable cause = getCause();
130:                if (cause instanceof  NestedCheckedException) {
131:                    return ((NestedCheckedException) cause).getRootCause();
132:                } else {
133:                    return cause;
134:                }
135:            }
136:
137:            /**
138:             * Retrieve the most specific cause of this exception, that is,
139:             * either the innermost cause (root cause) or this exception itself.
140:             * <p>Differs from {@link #getRootCause()} in that it falls back
141:             * to the present exception if there is no root cause.
142:             * @return the most specific cause (never <code>null</code>)
143:             * @since 2.0.3
144:             */
145:            public Throwable getMostSpecificCause() {
146:                Throwable rootCause = getRootCause();
147:                return (rootCause != null ? rootCause : this );
148:            }
149:
150:            /**
151:             * Check whether this exception contains an exception of the given type:
152:             * either it is of the given class itself or it contains a nested cause
153:             * of the given type.
154:             * <p>Currently just traverses <code>NestedCheckedException</code> causes.
155:             * Will use the JDK 1.4 exception cause mechanism once Spring requires JDK 1.4.
156:             * @param exType the exception type to look for
157:             * @return whether there is a nested exception of the specified type
158:             */
159:            public boolean contains(Class exType) {
160:                if (exType == null) {
161:                    return false;
162:                }
163:                if (exType.isInstance(this )) {
164:                    return true;
165:                }
166:                Throwable cause = getCause();
167:                if (cause instanceof  NestedCheckedException) {
168:                    return ((NestedCheckedException) cause).contains(exType);
169:                } else {
170:                    return (cause != null && exType.isInstance(cause));
171:                }
172:            }
173:
174:        }
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