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Commons JXPath example source code file (RootContext.java)
The Commons JXPath RootContext.java source code/* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You under the Apache License, Version 2.0 * (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.apache.commons.jxpath.ri.axes; import org.apache.commons.jxpath.Function; import org.apache.commons.jxpath.JXPathContext; import org.apache.commons.jxpath.NodeSet; import org.apache.commons.jxpath.ri.EvalContext; import org.apache.commons.jxpath.ri.JXPathContextReferenceImpl; import org.apache.commons.jxpath.ri.QName; import org.apache.commons.jxpath.ri.model.NodePointer; /** * EvalContext that is used to hold the root node for the path traversal. * * @author Dmitri Plotnikov * @version $Revision: 652845 $ $Date: 2008-05-02 12:46:46 -0500 (Fri, 02 May 2008) $ */ public class RootContext extends EvalContext { private JXPathContextReferenceImpl jxpathContext; private NodePointer pointer; private Object[] registers; private int availableRegister = 0; public static final Object UNKNOWN_VALUE = new Object(); private static final int MAX_REGISTER = 4; /** * Create a new RootContext. * @param jxpathContext context * @param pointer pointer */ public RootContext(JXPathContextReferenceImpl jxpathContext, NodePointer pointer) { super(null); this.jxpathContext = jxpathContext; this.pointer = pointer; if (pointer != null) { pointer.setNamespaceResolver(jxpathContext.getNamespaceResolver()); } } public JXPathContext getJXPathContext() { return jxpathContext; } public RootContext getRootContext() { return this; } /** * Get absolute root context * @return EvalContext */ public EvalContext getAbsoluteRootContext() { return jxpathContext.getAbsoluteRootContext(); } public NodePointer getCurrentNodePointer() { return pointer; } public Object getValue() { return pointer; } public int getCurrentPosition() { throw new UnsupportedOperationException(); } public boolean nextNode() { throw new UnsupportedOperationException(); } public boolean nextSet() { throw new UnsupportedOperationException(); } public boolean setPosition(int position) { throw new UnsupportedOperationException(); } /** * Get a context that points to the specified object. * @param constant object * @return EvalContext */ public EvalContext getConstantContext(Object constant) { if (constant instanceof NodeSet) { return new NodeSetContext( new RootContext(jxpathContext, null), (NodeSet) constant); } NodePointer pointer; if (constant instanceof NodePointer) { pointer = (NodePointer) constant; } else { pointer = NodePointer.newNodePointer( new QName(null, ""), constant, null); } return new InitialContext(new RootContext(jxpathContext, pointer)); } /** * Get variable context. * @param variableName variable name * @return EvalContext */ public EvalContext getVariableContext(QName variableName) { return new InitialContext( new RootContext( jxpathContext, jxpathContext.getVariablePointer(variableName))); } /** * Get the specified function from the context. * @param functionName QName * @param parameters Object[] * @return Function */ public Function getFunction(QName functionName, Object[] parameters) { return jxpathContext.getFunction(functionName, parameters); } /** * Get a registered value. * @param id int * @return Object */ public Object getRegisteredValue(int id) { if (registers == null || id >= MAX_REGISTER || id == -1) { return UNKNOWN_VALUE; } return registers[id]; } /** * Set the next registered value. * @param value Object * @return the id that can reclaim value. */ public int setRegisteredValue(Object value) { if (registers == null) { registers = new Object[MAX_REGISTER]; for (int i = 0; i < MAX_REGISTER; i++) { registers[i] = UNKNOWN_VALUE; } } if (availableRegister >= MAX_REGISTER) { return -1; } registers[availableRegister] = value; availableRegister++; return availableRegister - 1; } public String toString() { return super.toString() + ":" + pointer.asPath(); } } Other Commons JXPath examples (source code examples)Here is a short list of links related to this Commons JXPath RootContext.java source code file: |
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