Source Code Cross Referenced for XOMObjectModel.java in  » XML » XPath-Saxon » net » sf » saxon » xom » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » XML » XPath Saxon » net.sf.saxon.xom 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package net.sf.saxon.xom;
002:
003:        import net.sf.saxon.Configuration;
004:        import net.sf.saxon.event.PipelineConfiguration;
005:        import net.sf.saxon.event.Receiver;
006:        import net.sf.saxon.expr.XPathContext;
007:        import net.sf.saxon.om.*;
008:        import net.sf.saxon.trans.DynamicError;
009:        import net.sf.saxon.trans.XPathException;
010:        import net.sf.saxon.value.Value;
011:        import net.sf.saxon.value.SingletonNode;
012:        import net.sf.saxon.value.SequenceExtent;
013:        import nu.xom.Document;
014:        import nu.xom.Node;
015:
016:        import javax.xml.transform.Result;
017:        import javax.xml.transform.Source;
018:        import java.util.ArrayList;
019:        import java.util.HashSet;
020:        import java.util.List;
021:        import java.lang.reflect.Array;
022:        import java.io.Serializable;
023:
024:        /**
025:         * This interface must be implemented by any third-party object model that can
026:         * be wrapped with a wrapper that implements the Saxon Object Model (the NodeInfo interface).
027:         * This implementation of the interface supports wrapping of JDOM Documents.
028:         */
029:
030:        public class XOMObjectModel implements  ExternalObjectModel,
031:                Serializable {
032:
033:            public XOMObjectModel() {
034:            }
035:
036:            /**
037:             * Test whether this object model recognizes a given node as one of its own
038:             */
039:
040:            public boolean isRecognizedNode(Object object) {
041:                return (object instanceof  nu.xom.Node);
042:            }
043:
044:            /**
045:             * Test whether this object model recognizes a given class as representing a
046:             * node in that object model. This method will generally be called at compile time.
047:             *
048:             * @param nodeClass A class that possibly represents nodes
049:             * @return true if the class is used to represent nodes in this object model
050:             */
051:
052:            public boolean isRecognizedNodeClass(Class nodeClass) {
053:                return nu.xom.Node.class.isAssignableFrom(nodeClass);
054:            }
055:
056:            /**
057:             * Test whether this object model recognizes a given class as representing a
058:             * list of nodes in that object model. This method will generally be called at compile time.
059:             *
060:             * @param nodeClass A class that possibly represents nodes
061:             * @return true if the class is used to represent nodes in this object model
062:             */
063:
064:            public boolean isRecognizedNodeListClass(Class nodeClass) {
065:                return false;
066:                //        return nu.xom.Nodes.class.isAssignableFrom(nodeClass);
067:            }
068:
069:            /**
070:             * Test whether this object model recognizes a particular kind of JAXP Result object,
071:             * and if it does, return a Receiver that builds an instance of this data model from
072:             * a sequence of events. If the Result is not recognised, return null.
073:             */
074:
075:            public Receiver getDocumentBuilder(Result result) {
076:                return null; //To change body of implemented methods use File | Settings | File Templates.
077:            }
078:
079:            /**
080:             * Test whether this object model recognizes a particular kind of JAXP Source object,
081:             * and if it does, send the contents of the document to a supplied Receiver, and return true.
082:             * Otherwise, return false.
083:             */
084:
085:            public boolean sendSource(Source source, Receiver receiver,
086:                    PipelineConfiguration pipe) throws XPathException {
087:                return false; //To change body of implemented methods use File | Settings | File Templates.
088:            }
089:
090:            /**
091:             * Wrap or unwrap a node using this object model to return the corresponding Saxon node. If the supplied
092:             * source does not belong to this object model, return null
093:             */
094:
095:            public NodeInfo unravel(Source source, Configuration config) {
096:                return null; //To change body of implemented methods use File | Settings | File Templates.
097:            }
098:
099:            /**
100:             * Convert a Java object to an XPath value. If the supplied object is recognized as a representation
101:             * of a value using this object model, the object model should convert the value to an XPath value
102:             * and return this as the result. If not, it should return null. If the object is recognized but cannot
103:             * be converted, an exception should be thrown
104:             */
105:
106:            public Value convertObjectToXPathValue(Object object,
107:                    Configuration config) throws XPathException {
108:                if (object instanceof  Node) {
109:                    return new SingletonNode(wrapNode((Node) object, config));
110:                } else if (object instanceof  Node[]) {
111:                    NodeInfo[] nodes = new NodeInfo[((Node[]) object).length];
112:                    for (int i = 0; i < nodes.length; i++) {
113:                        nodes[i] = wrapNode(((Node[]) object)[i], config);
114:                    }
115:                    return new SequenceExtent(nodes);
116:                } else {
117:                    return null;
118:                }
119:            }
120:
121:            private synchronized NodeInfo wrapNode(Node node,
122:                    Configuration config) {
123:                return new DocumentWrapper(node.getDocument(), "", config)
124:                        .wrap(node);
125:            }
126:
127:            /**
128:             * Convert an XPath value to an object in this object model. If the supplied value can be converted
129:             * to an object in this model, of the specified class, then the conversion should be done and the
130:             * resulting object returned. If the value cannot be converted, the method should return null. Note
131:             * that the supplied class might be a List, in which case the method should inspect the contents of the
132:             * Value to see whether they belong to this object model.
133:             */
134:
135:            public Object convertXPathValueToObject(Value value,
136:                    Class targetClass, XPathContext context)
137:                    throws XPathException {
138:                // We accept the object if (a) the target class is Node or Node[],
139:                // or (b) the supplied object is a node, or sequence of nodes, that wrap XOM nodes,
140:                // provided that the target class is Object or a collection class
141:                boolean requireXOM = (Node.class.isAssignableFrom(targetClass) || (targetClass
142:                        .isArray() && Node.class.isAssignableFrom(targetClass
143:                        .getComponentType())));
144:
145:                // Note: we allow the declared type of the method argument to be a subclass of Node. If the actual
146:                // node supplied is the wrong kind of node, this will result in a Java exception.
147:
148:                boolean allowXOM = (targetClass == Object.class
149:                        || targetClass.isAssignableFrom(ArrayList.class)
150:                        || targetClass.isAssignableFrom(HashSet.class) || (targetClass
151:                        .isArray() && targetClass.getComponentType() == Object.class));
152:                if (!(requireXOM || allowXOM)) {
153:                    return null;
154:                }
155:                List nodes = new ArrayList(20);
156:
157:                SequenceIterator iter = value.iterate(context);
158:                while (true) {
159:                    Item item = iter.next();
160:                    if (item == null) {
161:                        break;
162:                    }
163:                    if (item instanceof  VirtualNode) {
164:                        Object o = ((VirtualNode) item).getUnderlyingNode();
165:                        if (o instanceof  Node) {
166:                            nodes.add(o);
167:                        } else {
168:                            if (requireXOM) {
169:                                DynamicError err = new DynamicError(
170:                                        "Extension function required class "
171:                                                + targetClass.getName()
172:                                                + "; supplied value of class "
173:                                                + item.getClass().getName()
174:                                                + " could not be converted");
175:                                throw err;
176:                            }
177:                            ;
178:                        }
179:                    } else if (requireXOM) {
180:                        DynamicError err = new DynamicError(
181:                                "Extension function required class "
182:                                        + targetClass.getName()
183:                                        + "; supplied value of class "
184:                                        + item.getClass().getName()
185:                                        + " could not be converted");
186:                        throw err;
187:                    } else {
188:                        return null; // DOM Nodes are not actually required; let someone else try the conversion
189:                    }
190:                }
191:
192:                if (nodes.size() == 0 && !requireXOM) {
193:                    return null; // empty sequence supplied - try a different mapping
194:                }
195:                if (Node.class.isAssignableFrom(targetClass)) {
196:                    if (nodes.size() != 1) {
197:                        DynamicError err = new DynamicError(
198:                                "Extension function requires a single XOM Node"
199:                                        + "; supplied value contains "
200:                                        + nodes.size() + " nodes");
201:                        throw err;
202:                    }
203:                    return nodes.get(0);
204:                } else if (targetClass.isArray()
205:                        && Node.class.isAssignableFrom(targetClass
206:                                .getComponentType())) {
207:                    Node[] array = (Node[]) Array.newInstance(targetClass
208:                            .getComponentType(), nodes.size());
209:                    nodes.toArray(array);
210:                    return array;
211:                } else if (targetClass.isAssignableFrom(ArrayList.class)) {
212:                    return nodes;
213:                } else if (targetClass.isAssignableFrom(HashSet.class)) {
214:                    return new HashSet(nodes);
215:                } else {
216:                    // after all this work, give up
217:                    return null;
218:                }
219:            }
220:
221:            /**
222:             * Wrap a document node in the external object model in a document wrapper that implements
223:             * the Saxon DocumentInfo interface
224:             * @param node    a node (any node) in the third party document
225:             * @param baseURI the base URI of the node (supply "" if unknown)
226:             * @param config the Saxon configuration (which among other things provides access to the NamePool)
227:             * @return the wrapper, which must implement DocumentInfo
228:             */
229:
230:            public DocumentInfo wrapDocument(Object node, String baseURI,
231:                    Configuration config) {
232:                Document documentNode = ((Node) node).getDocument();
233:                return new DocumentWrapper(documentNode, baseURI, config);
234:            }
235:
236:            /**
237:             * Wrap a node within the external object model in a node wrapper that implements the Saxon
238:             * VirtualNode interface (which is an extension of NodeInfo)
239:             * @param document the document wrapper, as a DocumentInfo object
240:             * @param node the node to be wrapped. This must be a node within the document wrapped by the
241:             * DocumentInfo provided in the first argument
242:             * @return the wrapper for the node, as an instance of VirtualNode
243:             */
244:
245:            public NodeInfo wrapNode(DocumentInfo document, Object node) {
246:                if (!(node instanceof  Node)) {
247:                    throw new IllegalArgumentException(
248:                            "Object to be wrapped is not a XOM Node: "
249:                                    + node.getClass());
250:                }
251:                return ((DocumentWrapper) document).wrap((Node) node);
252:            }
253:
254:            /**
255:             * Convert a sequence of values to a NODELIST, as defined in the JAXP XPath API spec. This method
256:             * is used when the evaluate() request specifies the return type as NODELIST, regardless of the
257:             * actual results of the expression. If the sequence contains things other than nodes, the fallback
258:             * is to return the sequence as a Java List object. The method can return null to invoke fallback
259:             * behaviour.
260:             */
261:
262:            public Object convertToNodeList(SequenceExtent extent) {
263:                return null;
264:            }
265:        }
266:
267:        //
268:        // The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
269:        // you may not use this file except in compliance with the License. You may obtain a copy of the
270:        // License at http://www.mozilla.org/MPL/
271:        //
272:        // Software distributed under the License is distributed on an "AS IS" basis,
273:        // WITHOUT WARRANTY OF ANY KIND, either express or implied.
274:        // See the License for the specific language governing rights and limitations under the License.
275:        //
276:        // The Original Code is: all this file.
277:        //
278:        // The Initial Developer of the Original Code is Michael H. Kay.
279:        //
280:        // Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
281:        //
282:        // Contributor(s): Gunther Schadow (changes to allow access to public fields; also wrapping
283:        // of extensions and mapping of null to empty sequence).
284:        //
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