Source Code Cross Referenced for XPathFactoryImpl.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.Configuration;
004:        import net.sf.saxon.FeatureKeys;
005:        import net.sf.saxon.om.NamespaceConstant;
006:        import net.sf.saxon.om.Validation;
007:
008:        import javax.xml.XMLConstants;
009:        import javax.xml.xpath.*;
010:
011:        /**
012:         * Saxon implementation of the JAXP 1.3 XPathFactory
013:         */
014:        public class XPathFactoryImpl extends XPathFactory {
015:
016:            private Configuration config;
017:            private XPathVariableResolver variableResolver;
018:            private XPathFunctionResolver functionResolver;
019:
020:            public XPathFactoryImpl() {
021:                config = makeConfiguration();
022:            }
023:
024:            protected Configuration makeConfiguration() {
025:                return new Configuration();
026:            }
027:
028:            /**
029:             * Get the Configuration object
030:             */
031:
032:            public Configuration getConfiguration() {
033:                return config;
034:            }
035:
036:            /**
037:             * Test whether a given object model is supported. Returns true if the object model
038:             * is the Saxon object model, DOM, JDOM, or XOM
039:             * @param model The URI identifying the object model.
040:             * @return true if the object model is one of
041:             * {@link NamespaceConstant#OBJECT_MODEL_SAXON},
042:             * {@link XPathConstants#DOM_OBJECT_MODEL},
043:             * {@link NamespaceConstant#OBJECT_MODEL_JDOM}, or
044:             * {@link NamespaceConstant#OBJECT_MODEL_XOM}
045:             */
046:            public boolean isObjectModelSupported(String model) {
047:                if (model.equals(NamespaceConstant.OBJECT_MODEL_SAXON))
048:                    return true;
049:                if (model.equals(XPathConstants.DOM_OBJECT_MODEL))
050:                    return true;
051:                if (model.equals(NamespaceConstant.OBJECT_MODEL_JDOM))
052:                    return true;
053:                if (model.equals(NamespaceConstant.OBJECT_MODEL_XOM))
054:                    return true;
055:                return false;
056:            }
057:
058:            /**
059:             * Set a feature of this XPath implementation. The only features currently
060:             * recognized are:
061:             * <ul>
062:             * <li> {@link XMLConstants#FEATURE_SECURE_PROCESSING} </li>
063:             * <li> {@link net.sf.saxon.FeatureKeys#SCHEMA_VALIDATION}: requests schema validation of source documents.
064:             *   The property is rejected if the configuration is not schema-aware. </li>
065:             * </ul>
066:             * @param feature a URI identifying the feature
067:             * @param b true to set the feature on, false to set it off
068:             * @throws XPathFactoryConfigurationException if the feature name is not recognized
069:             */
070:
071:            public void setFeature(String feature, boolean b)
072:                    throws XPathFactoryConfigurationException {
073:                if (feature.equals(XMLConstants.FEATURE_SECURE_PROCESSING)) {
074:                    config.setAllowExternalFunctions(!b);
075:                } else if (feature.equals(FeatureKeys.SCHEMA_VALIDATION)) {
076:                    config.setSchemaValidationMode(b ? Validation.STRICT
077:                            : Validation.STRIP);
078:                } else {
079:                    throw new XPathFactoryConfigurationException(
080:                            "Unknown feature: " + feature);
081:                }
082:            }
083:
084:            /**
085:             * Get a feature of this XPath implementation. The only features currently
086:             * recognized are:
087:             * <ul>
088:             * <li> {@link XMLConstants#FEATURE_SECURE_PROCESSING} </li>
089:             * <li> {@link net.sf.saxon.FeatureKeys#SCHEMA_VALIDATION}: requests schema validation of source documents. </li>
090:             * </ul>
091:             * @param feature a URI identifying the feature
092:             * @return true if the feature is on, false if it is off
093:             * @throws XPathFactoryConfigurationException if the feature name is not recognized
094:             */
095:
096:            public boolean getFeature(String feature)
097:                    throws XPathFactoryConfigurationException {
098:                if (feature.equals(XMLConstants.FEATURE_SECURE_PROCESSING)) {
099:                    return !config.isAllowExternalFunctions();
100:                } else if (feature.equals(FeatureKeys.SCHEMA_VALIDATION)) {
101:                    return config.getSchemaValidationMode() == Validation.STRICT;
102:                } else {
103:                    throw new XPathFactoryConfigurationException(
104:                            "Unknown feature: " + feature);
105:                }
106:            }
107:
108:            /**
109:             * Set a resolver for XPath variables. This will be used to obtain the value of
110:             * any variable referenced in an XPath expression. The variable resolver must be allocated
111:             * before the expression is compiled, but it will only be called when the expression
112:             * is evaluated.
113:             * @param xPathVariableResolver The object used to resolve references to variables.
114:             */
115:            public void setXPathVariableResolver(
116:                    XPathVariableResolver xPathVariableResolver) {
117:                variableResolver = xPathVariableResolver;
118:            }
119:
120:            /**
121:             * Set a resolver for XPath functions. This will be used to obtain an implementation
122:             * of any external function referenced in an XPath expression. This is not required for
123:             * system functions, Saxon extension functions, constructor functions named after types,
124:             * or extension functions bound using a namespace that maps to a Java class.
125:             * @param xPathFunctionResolver The object used to resolve references to external functions.
126:             */
127:
128:            public void setXPathFunctionResolver(
129:                    XPathFunctionResolver xPathFunctionResolver) {
130:                functionResolver = xPathFunctionResolver;
131:            }
132:
133:            /**
134:             * Create an XPath evaluator
135:             * @return an XPath object, which can be used to compile and execute XPath expressions.
136:             */
137:            public XPath newXPath() {
138:                XPathEvaluator xpath = new XPathEvaluator(config);
139:                xpath.setXPathFunctionResolver(functionResolver);
140:                xpath.setXPathVariableResolver(variableResolver);
141:                //config.registerStandardObjectModels();
142:                return xpath;
143:            }
144:
145:        }
146:
147:        //
148:        // The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
149:        // you may not use this file except in compliance with the License. You may obtain a copy of the
150:        // License at http://www.mozilla.org/MPL/
151:        //
152:        // Software distributed under the License is distributed on an "AS IS" basis,
153:        // WITHOUT WARRANTY OF ANY KIND, either express or implied.
154:        // See the License for the specific language governing rights and limitations under the License.
155:        //
156:        // The Original Code is: all this file.
157:        //
158:        // The Initial Developer of the Original Code is Michael H. Kay.
159:        //
160:        // Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
161:        //
162:        // Contributor(s):
163:        //
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