Source Code Cross Referenced for UnmarshalBuilder.java in  » XML » jibx-1.1.5 » org » jibx » binding » classes » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » XML » jibx 1.1.5 » org.jibx.binding.classes 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:        Copyright (c) 2003-2005, Dennis M. Sosnoski
003:        All rights reserved.
004:
005:        Redistribution and use in source and binary forms, with or without modification,
006:        are permitted provided that the following conditions are met:
007:
008:         * Redistributions of source code must retain the above copyright notice, this
009:           list of conditions and the following disclaimer.
010:         * Redistributions in binary form must reproduce the above copyright notice,
011:           this list of conditions and the following disclaimer in the documentation
012:           and/or other materials provided with the distribution.
013:         * Neither the name of JiBX nor the names of its contributors may be used
014:           to endorse or promote products derived from this software without specific
015:           prior written permission.
016:
017:        THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
018:        ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
019:        WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
020:        DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
021:        ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
022:        (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
023:        LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
024:        ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
025:        (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
026:        SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
027:         */
028:
029:        package org.jibx.binding.classes;
030:
031:        import org.apache.bcel.Constants;
032:        import org.apache.bcel.generic.*;
033:        import org.jibx.runtime.JiBXException;
034:
035:        /**
036:         * Unmarshalling method builder. Tracks the creation of an unmarshalling method,
037:         * including special handling of exceptions that may be generated by object
038:         * accesses during the unmarshalling process.
039:         *
040:         * @author Dennis M. Sosnoski
041:         * @version 1.0
042:         */
043:
044:        public class UnmarshalBuilder extends MarshalUnmarshalBuilder {
045:            //
046:            // Constants for code generation.
047:
048:            private static final String UNMARSHALCONTEXT_CLASS = "org.jibx.runtime.impl.UnmarshallingContext";
049:            protected static final String UNMARSHAL_EXCEPTION_TEXT = "Error while unmarshalling ";
050:            protected static final String UNMARSHALLING_POSITION_METHOD = "org.jibx.runtime.impl.UnmarshallingContext.buildPositionString";
051:            protected static final String UNMARSHALLING_POSITION_SIGNATURE = "()Ljava/lang/String;";
052:            protected static final Type[] UNMARSHAL_METHOD_ARGS = { new ObjectType(
053:                    "org.jibx.runtime.impl.UnmarshallingContext") };
054:            protected static final Type[] SINGLE_STRING_ARGS = { Type.STRING };
055:
056:            /**
057:             * Constructor. This sets up for constructing a virtual unmarshalling method
058:             * with public access and wrapped exception handling. If the method is being
059:             * generated directly to the class being unmarshalled it's built as a
060:             * virtual method; otherwise, it's done as a static method.
061:             *
062:             * @param name method name to be built
063:             * @param cf unmarshal class file information
064:             * @param mf method generation class file information
065:             * @throws JiBXException on error in initializing method construction
066:             */
067:
068:            public UnmarshalBuilder(String name, ClassFile cf, ClassFile mf)
069:                    throws JiBXException {
070:                super (name, cf.getType(),
071:                        (mf == cf) ? UNMARSHAL_METHOD_ARGS : new Type[] {
072:                                cf.getType(), UNMARSHAL_METHOD_ARGS[0] }, mf,
073:                        (mf == cf) ? Constants.ACC_PUBLIC | Constants.ACC_FINAL
074:                                : Constants.ACC_PUBLIC | Constants.ACC_STATIC,
075:                        0, cf.getName(), 1, UNMARSHALCONTEXT_CLASS);
076:            }
077:
078:            /**
079:             * Add exception handler code. The implementation of this abstract base
080:             * class method provides handling specific to an unmarshalling method.
081:             * 
082:             * @return handle for first instruction in handler
083:             * @throws JiBXException on error in creating exception handler
084:             */
085:
086:            public InstructionHandle genExceptionHandler() throws JiBXException {
087:
088:                // first part of instruction sequence is create new exception object,
089:                //  duplicate two down (below caught exception), swap (so order is new,
090:                //  new, caught)
091:                initStackState(new String[] { "java.lang.Exception" });
092:                InstructionHandle start = internalAppendCreateNew(FRAMEWORK_EXCEPTION_CLASS);
093:                appendDUP_X1();
094:                appendSWAP();
095:
096:                // second part of sequence is build StringBuffer, duplicate, load lead
097:                //  String, call constructor with String argument, load unmarshalling
098:                //  context, call position String method, call StringBuffer append,
099:                //  call StringBuffer toString
100:                appendCreateNew("java.lang.StringBuffer");
101:                appendDUP();
102:                appendLoadConstant(UNMARSHAL_EXCEPTION_TEXT);
103:                appendCallInit("java.lang.StringBuffer",
104:                        "(Ljava/lang/String;)V");
105:                loadContext();
106:                appendCallVirtual(UNMARSHALLING_POSITION_METHOD,
107:                        UNMARSHALLING_POSITION_SIGNATURE);
108:                appendCallVirtual("java.lang.StringBuffer.append",
109:                        "(Ljava/lang/String;)Ljava/lang/StringBuffer;");
110:                appendCallVirtual("java.lang.StringBuffer.toString",
111:                        "()Ljava/lang/String;");
112:
113:                // final part of sequence is swap to get arguments in correct order,
114:                //  invoke exception constructor, throw exception
115:                appendSWAP();
116:                appendCallInit(FRAMEWORK_EXCEPTION_CLASS,
117:                        EXCEPTION_CONSTRUCTOR_SIGNATURE2);
118:                appendThrow();
119:                return start;
120:            }
121:        }
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