Source Code Cross Referenced for XPathFunctionLibrary.java in  » XML » saxonb » net » sf » saxon » xpath » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » XML » saxonb » net.sf.saxon.xpath 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package net.sf.saxon.xpath;
002:
003:        import net.sf.saxon.expr.Expression;
004:        import net.sf.saxon.functions.FunctionLibrary;
005:        import net.sf.saxon.trans.XPathException;
006:
007:        import javax.xml.namespace.QName;
008:        import javax.xml.xpath.XPathFunction;
009:        import javax.xml.xpath.XPathFunctionResolver;
010:
011:        /**
012:         * The XPathFunctionLibrary is a FunctionLibrary that supports binding of XPath function
013:         * calls to instances of the JAXP XPathFunction interface returned by an XPathFunctionResolver.
014:         */
015:
016:        public class XPathFunctionLibrary implements  FunctionLibrary {
017:
018:            private XPathFunctionResolver resolver;
019:
020:            /**
021:             * Construct a XPathFunctionLibrary
022:             */
023:
024:            public XPathFunctionLibrary() {
025:            }
026:
027:            /**
028:             * Set the resolver
029:             * @param resolver The XPathFunctionResolver wrapped by this FunctionLibrary
030:             */
031:
032:            public void setXPathFunctionResolver(XPathFunctionResolver resolver) {
033:                this .resolver = resolver;
034:            }
035:
036:            /**
037:             * Get the resolver
038:             * @return the XPathFunctionResolver wrapped by this FunctionLibrary
039:             */
040:
041:            public XPathFunctionResolver getXPathFunctionResolver() {
042:                return resolver;
043:            }
044:
045:            /**
046:             * Test whether an XPath function with a given name and arity is available. This supports
047:             * the function-available() function in XSLT. It is thus never used, and always returns false
048:             * @param fingerprint The code that identifies the function name in the NamePool. This must
049:             * match the supplied URI and local name.
050:             * @param uri  The URI of the function name
051:             * @param local  The local part of the function name
052:             * @param arity The number of arguments. This is set to -1 in the case of the single-argument
053:             * function-available() function; in this case the method should return true if there is some
054:             * matching extension function, regardless of its arity.
055:             */
056:
057:            public boolean isAvailable(int fingerprint, String uri,
058:                    String local, int arity) {
059:                return false;
060:            }
061:
062:            /**
063:             * Bind a function, given the URI and local parts of the function name,
064:             * and the list of expressions supplied as arguments. This method is called at compile
065:             * time.
066:             * @param nameCode The namepool code of the function name. This must match the supplied
067:             * URI and local name.
068:             * @param uri  The URI of the function name
069:             * @param local  The local part of the function name
070:             * @param staticArgs  The expressions supplied statically in the function call. The intention is
071:             * that the static type of the arguments (obtainable via getItemType() and getCardinality() may
072:             * be used as part of the binding algorithm.
073:             * @return An object representing the extension function to be called, if one is found;
074:             * null if no extension function was found matching the required name, arity, or signature.
075:             */
076:
077:            public Expression bind(int nameCode, String uri, String local,
078:                    Expression[] staticArgs) throws XPathException {
079:                if (resolver == null) {
080:                    return null;
081:                }
082:                QName name = new QName(uri, local);
083:                XPathFunction function = resolver.resolveFunction(name,
084:                        staticArgs.length);
085:                if (function == null) {
086:                    return null;
087:                }
088:                XPathFunctionCall fc = new XPathFunctionCall(function);
089:                fc.setArguments(staticArgs);
090:                return fc;
091:            }
092:
093:            /**
094:             * This method creates a copy of a FunctionLibrary: if the original FunctionLibrary allows
095:             * new functions to be added, then additions to this copy will not affect the original, or
096:             * vice versa.
097:             *
098:             * @return a copy of this function library. This must be an instance of the original class.
099:             */
100:
101:            public FunctionLibrary copy() {
102:                XPathFunctionLibrary xfl = new XPathFunctionLibrary();
103:                xfl.resolver = resolver;
104:                return xfl;
105:            }
106:
107:        }
108:
109:        //
110:        // The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
111:        // you may not use this file except in compliance with the License. You may obtain a copy of the
112:        // License at http://www.mozilla.org/MPL/
113:        //
114:        // Software distributed under the License is distributed on an "AS IS" basis,
115:        // WITHOUT WARRANTY OF ANY KIND, either express or implied.
116:        // See the License for the specific language governing rights and limitations under the License.
117:        //
118:        // The Original Code is: all this file.
119:        //
120:        // The Initial Developer of the Original Code is Michael H. Kay.
121:        //
122:        // Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
123:        //
124:        // Contributor(s): none.
125:        //
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