Source Code Cross Referenced for Dom4JElementMapper.java in  » XML » jibx-1.1.5 » org » jibx » extras » 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.extras 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:        Copyright (c) 2004, 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.extras;
030:
031:        import java.io.IOException;
032:
033:        import org.dom4j.Element;
034:        import org.jibx.runtime.IAliasable;
035:        import org.jibx.runtime.IMarshaller;
036:        import org.jibx.runtime.IMarshallingContext;
037:        import org.jibx.runtime.IUnmarshaller;
038:        import org.jibx.runtime.IUnmarshallingContext;
039:        import org.jibx.runtime.JiBXException;
040:        import org.jibx.runtime.impl.UnmarshallingContext;
041:
042:        /**
043:         * <p>Custom element marshaller/unmarshaller to dom4j representation. This
044:         * allows you to mix data binding and document model representations for XML
045:         * within the same application. You simply use this marshaller/unmarshaller with
046:         * a linked object type of <code>org.dom4j.Element</code> (the actual runtime
047:         * type - the declared type is ignored and can be anything). If a name is
048:         * supplied on a reference that element name will always be matched when
049:         * unmarshalling but will be ignored when marshalling (with the actual dom4j
050:         * element name used). If no name is supplied this will unmarshal a single
051:         * element with any name.</p>
052:         * 
053:         * @author Dennis M. Sosnoski
054:         * @version 1.0
055:         */
056:
057:        public class Dom4JElementMapper extends Dom4JMapperBase implements 
058:                IMarshaller, IUnmarshaller, IAliasable {
059:            /** Root element namespace URI. */
060:            private final String m_uri;
061:
062:            /** Namespace URI index in binding. */
063:            private final int m_index;
064:
065:            /** Root element name. */
066:            private final String m_name;
067:
068:            /**
069:             * Default constructor.
070:             */
071:
072:            public Dom4JElementMapper() {
073:                m_uri = null;
074:                m_index = -1;
075:                m_name = null;
076:            }
077:
078:            /**
079:             * Aliased constructor. This takes a name definition for the element. It'll
080:             * be used by JiBX when a name is supplied by the mapping which references
081:             * this custom marshaller/unmarshaller.
082:             *
083:             * @param uri namespace URI for the top-level element
084:             * @param index namespace index corresponding to the defined URI within the
085:             * marshalling context definitions
086:             * @param name local name for the top-level element
087:             */
088:
089:            public Dom4JElementMapper(String uri, int index, String name) {
090:
091:                // save the simple values
092:                m_uri = uri;
093:                m_index = index;
094:                m_name = name;
095:            }
096:
097:            /* (non-Javadoc)
098:             * @see org.jibx.runtime.IMarshaller#isExtension(int)
099:             */
100:
101:            public boolean isExtension(int index) {
102:                return false;
103:            }
104:
105:            /* (non-Javadoc)
106:             * @see org.jibx.runtime.IMarshaller#marshal(java.lang.Object,
107:             *  org.jibx.runtime.IMarshallingContext)
108:             */
109:
110:            public void marshal(Object obj, IMarshallingContext ictx)
111:                    throws JiBXException {
112:
113:                // make sure the parameters are as expected
114:                if (!(obj instanceof  Element)) {
115:                    throw new JiBXException(
116:                            "Mapped object not an org.dom4j.Element");
117:                } else {
118:                    try {
119:
120:                        // marshal element and all content with only leading indentation
121:                        m_xmlWriter = ictx.getXmlWriter();
122:                        m_xmlWriter.indent();
123:                        int indent = ictx.getIndent();
124:                        ictx.setIndent(-1);
125:                        m_defaultNamespaceURI = null;
126:                        marshalElement((Element) obj);
127:                        ictx.setIndent(indent);
128:
129:                    } catch (IOException e) {
130:                        throw new JiBXException("Error writing to document", e);
131:                    }
132:                }
133:            }
134:
135:            /* (non-Javadoc)
136:             * @see org.jibx.runtime.IUnmarshaller#isPresent(org.jibx.runtime.IUnmarshallingContext)
137:             */
138:
139:            public boolean isPresent(IUnmarshallingContext ctx)
140:                    throws JiBXException {
141:                if (m_name == null) {
142:                    if (!(ctx instanceof  UnmarshallingContext)) {
143:                        throw new JiBXException(
144:                                "Unmarshalling context not of expected type");
145:                    } else {
146:                        return !((UnmarshallingContext) ctx).isEnd();
147:                    }
148:                } else {
149:                    return ctx.isAt(m_uri, m_name);
150:                }
151:            }
152:
153:            /* (non-Javadoc)
154:             * @see org.jibx.runtime.IUnmarshaller#unmarshal(java.lang.Object,
155:             *  org.jibx.runtime.IUnmarshallingContext)
156:             */
157:
158:            public Object unmarshal(Object obj, IUnmarshallingContext ictx)
159:                    throws JiBXException {
160:
161:                // verify the entry conditions
162:                if (!(ictx instanceof  UnmarshallingContext)) {
163:                    throw new JiBXException(
164:                            "Unmarshalling context not of expected type");
165:                } else if (m_name != null && !ictx.isAt(m_uri, m_name)) {
166:                    ((UnmarshallingContext) ictx).throwStartTagNameError(m_uri,
167:                            m_name);
168:                }
169:
170:                // position to element start tag
171:                m_unmarshalContext = (UnmarshallingContext) ictx;
172:                m_unmarshalContext.toStart();
173:
174:                // unmarshal element to document model
175:                try {
176:                    return unmarshalElement();
177:                } catch (IOException e) {
178:                    throw new JiBXException("Error reading from document", e);
179:                }
180:            }
181:        }
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