Source Code Cross Referenced for Id.java in  » XML » XPath-Saxon » net » sf » saxon » functions » 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.functions 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package net.sf.saxon.functions;
002:
003:        import net.sf.saxon.expr.*;
004:        import net.sf.saxon.om.*;
005:        import net.sf.saxon.sort.DocumentOrderIterator;
006:        import net.sf.saxon.sort.LocalOrderComparer;
007:        import net.sf.saxon.trans.XPathException;
008:        import net.sf.saxon.value.AtomicValue;
009:        import net.sf.saxon.value.Cardinality;
010:        import net.sf.saxon.type.Type;
011:
012:        /**
013:         * The XPath id() function
014:         * XPath 2.0 version: accepts any sequence as the first parameter; each item in the sequence
015:         * is taken as an IDREFS value, that is, a space-separated list of ID values.
016:         * Also accepts an optional second argument to identify the target document, this
017:         * defaults to the context node.
018:         */
019:
020:        public class Id extends SystemFunction {
021:
022:            private boolean isSingletonId = false;
023:
024:            /**
025:             * Simplify: add a second implicit argument, the context document
026:             */
027:
028:            public Expression simplify(StaticContext env) throws XPathException {
029:                Id id = (Id) super .simplify(env);
030:                if (argument.length == 1) {
031:                    id.addContextDocumentArgument(1, "id");
032:                }
033:                return id;
034:            }
035:
036:            /**
037:             * Static analysis: prevent sorting of the argument
038:             */
039:
040:            public void checkArguments(StaticContext env) throws XPathException {
041:                super .checkArguments(env);
042:                Optimizer opt = env.getConfiguration().getOptimizer();
043:                argument[0] = ExpressionTool.unsorted(opt, argument[0], false);
044:                isSingletonId = !Cardinality.allowsMany(argument[0]
045:                        .getCardinality());
046:            }
047:
048:            /**
049:             * preEvaluate: this method suppresses compile-time evaluation by doing nothing
050:             */
051:
052:            public Expression preEvaluate(StaticContext env) {
053:                return this ;
054:            }
055:
056:            /**
057:             * Get the static properties of this expression (other than its type). The result is
058:             * bit-signficant. These properties are used for optimizations. In general, if
059:             * property bit is set, it is true, but if it is unset, the value is unknown.
060:             */
061:
062:            public int computeSpecialProperties() {
063:                int prop = StaticProperty.ORDERED_NODESET
064:                        | StaticProperty.SINGLE_DOCUMENT_NODESET
065:                        | StaticProperty.NON_CREATIVE;
066:                if ((getNumberOfArguments() == 1)
067:                        || (argument[1].getSpecialProperties() & StaticProperty.CONTEXT_DOCUMENT_NODESET) != 0) {
068:                    prop |= StaticProperty.CONTEXT_DOCUMENT_NODESET;
069:                }
070:                return prop;
071:            }
072:
073:            /**
074:             * Evaluate the function to return an iteration of selected nodes.
075:             */
076:
077:            public SequenceIterator iterate(XPathContext context)
078:                    throws XPathException {
079:
080:                NodeInfo arg1 = (NodeInfo) argument[1].evaluateItem(context);
081:                arg1 = arg1.getRoot();
082:                if (arg1.getNodeKind() != Type.DOCUMENT) {
083:                    dynamicError(
084:                            "In the id() function,"
085:                                    + " the tree being searched must be one whose root is a document node",
086:                            context);
087:                    return null;
088:                }
089:                DocumentInfo doc = (DocumentInfo) arg1;
090:
091:                if (isSingletonId) {
092:                    AtomicValue arg = (AtomicValue) argument[0]
093:                            .evaluateItem(context);
094:                    if (arg == null) {
095:                        return EmptyIterator.getInstance();
096:                    }
097:                    String idrefs = arg.getStringValue();
098:                    if (idrefs.indexOf(0x20) >= 0 || idrefs.indexOf(0x09) >= 0
099:                            || idrefs.indexOf(0x0a) >= 0
100:                            || idrefs.indexOf(0x0d) >= 0) {
101:                        StringTokenIterator tokens = new StringTokenIterator(
102:                                idrefs);
103:                        IdMappingFunction map = new IdMappingFunction();
104:                        map.document = doc;
105:                        SequenceIterator result = new MappingIterator(tokens,
106:                                map, null);
107:                        return new DocumentOrderIterator(result,
108:                                LocalOrderComparer.getInstance());
109:                    } else {
110:                        return SingletonIterator.makeIterator(doc
111:                                .selectID(idrefs));
112:                    }
113:                } else {
114:                    SequenceIterator idrefs = argument[0].iterate(context);
115:                    IdMappingFunction map = new IdMappingFunction();
116:                    map.document = doc;
117:                    SequenceIterator result = new MappingIterator(idrefs, map,
118:                            null);
119:                    return new DocumentOrderIterator(result, LocalOrderComparer
120:                            .getInstance());
121:                }
122:            }
123:
124:            private static class IdMappingFunction implements  MappingFunction {
125:
126:                public DocumentInfo document;
127:
128:                /**
129:                 * Evaluate the function for a single string value
130:                 * (implements the MappingFunction interface)
131:                 */
132:
133:                public Object map(Item item, XPathContext c)
134:                        throws XPathException {
135:
136:                    String idrefs = item.getStringValue().trim();
137:
138:                    // If this value contains a space, we need to break it up into its
139:                    // separate tokens; if not, we can process it directly
140:
141:                    if (idrefs.indexOf(0x20) >= 0 || idrefs.indexOf(0x09) >= 0
142:                            || idrefs.indexOf(0x0a) >= 0
143:                            || idrefs.indexOf(0x0d) >= 0) {
144:                        StringTokenIterator tokens = new StringTokenIterator(
145:                                idrefs);
146:                        IdMappingFunction submap = new IdMappingFunction();
147:                        submap.document = document;
148:                        return new MappingIterator(tokens, submap, null);
149:
150:                    } else {
151:                        return document.selectID(idrefs);
152:                    }
153:                }
154:            }
155:
156:        }
157:
158:        //
159:        // The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
160:        // you may not use this file except in compliance with the License. You may obtain a copy of the
161:        // License at http://www.mozilla.org/MPL/
162:        //
163:        // Software distributed under the License is distributed on an "AS IS" basis,
164:        // WITHOUT WARRANTY OF ANY KIND, either express or implied.
165:        // See the License for the specific language governing rights and limitations under the License.
166:        //
167:        // The Original Code is: all this file.
168:        //
169:        // The Initial Developer of the Original Code is Michael H. Kay.
170:        //
171:        // Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
172:        //
173:        // Contributor(s): none.
174:        //
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