/*
* 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.compiler;
import org.apache.commons.jxpath.ri.Compiler;
/**
* @author Dmitri Plotnikov
* @version $Revision: 652845 $ $Date: 2008-05-02 12:46:46 -0500 (Fri, 02 May 2008) $
*/
public class Step {
private int axis;
private NodeTest nodeTest;
private Expression[] predicates;
/**
* Create a new Step.
* @param axis axis code
* @param nodeTest step test
* @param predicates predicate expressions
*/
protected Step(int axis, NodeTest nodeTest, Expression[] predicates) {
this.axis = axis;
this.nodeTest = nodeTest;
this.predicates = predicates;
}
/**
* Get the axis code.
* @return int
*/
public int getAxis() {
return axis;
}
/**
* Get the step test.
* @return NodeTest
*/
public NodeTest getNodeTest() {
return nodeTest;
}
/**
* Get the predicates.
* @return Expression[]
*/
public Expression[] getPredicates() {
return predicates;
}
/**
* Learn whether this step contains any predicate that is context dependent.
* @return boolean
*/
public boolean isContextDependent() {
if (predicates != null) {
for (int i = 0; i < predicates.length; i++) {
if (predicates[i].isContextDependent()) {
return true;
}
}
}
return false;
}
public String toString() {
StringBuffer buffer = new StringBuffer();
int axis = getAxis();
if (axis == Compiler.AXIS_CHILD) {
buffer.append(nodeTest);
}
else if (axis == Compiler.AXIS_ATTRIBUTE) {
buffer.append('@');
buffer.append(nodeTest);
}
else if (axis == Compiler.AXIS_SELF
&& nodeTest instanceof NodeTypeTest
&& ((NodeTypeTest) nodeTest).getNodeType()
== Compiler.NODE_TYPE_NODE) {
buffer.append(".");
}
else if (axis == Compiler.AXIS_PARENT
&& nodeTest instanceof NodeTypeTest
&& ((NodeTypeTest) nodeTest).getNodeType()
== Compiler.NODE_TYPE_NODE) {
buffer.append("..");
}
else if (axis == Compiler.AXIS_DESCENDANT_OR_SELF
&& nodeTest instanceof NodeTypeTest
&& ((NodeTypeTest) nodeTest).getNodeType()
== Compiler.NODE_TYPE_NODE
&& (predicates == null || predicates.length == 0)) {
buffer.append("");
}
else {
buffer.append(axisToString(axis));
buffer.append("::");
buffer.append(nodeTest);
}
Expression[] predicates = getPredicates();
if (predicates != null) {
for (int i = 0; i < predicates.length; i++) {
buffer.append('[');
buffer.append(predicates[i]);
buffer.append(']');
}
}
return buffer.toString();
}
/**
* Decode an axis code to its name.
* @param axis int code
* @return String name.
* @see Compiler
* @see http://www.w3.org/TR/xpath#axes
*/
public static String axisToString(int axis) {
switch (axis) {
case Compiler.AXIS_SELF :
return "self";
case Compiler.AXIS_CHILD :
return "child";
case Compiler.AXIS_PARENT :
return "parent";
case Compiler.AXIS_ANCESTOR :
return "ancestor";
case Compiler.AXIS_ATTRIBUTE :
return "attribute";
case Compiler.AXIS_NAMESPACE :
return "namespace";
case Compiler.AXIS_PRECEDING :
return "preceding";
case Compiler.AXIS_FOLLOWING :
return "following";
case Compiler.AXIS_DESCENDANT :
return "descendant";
case Compiler.AXIS_ANCESTOR_OR_SELF :
return "ancestor-or-self";
case Compiler.AXIS_FOLLOWING_SIBLING :
return "following-sibling";
case Compiler.AXIS_PRECEDING_SIBLING :
return "preceding-sibling";
case Compiler.AXIS_DESCENDANT_OR_SELF :
return "descendant-or-self";
default:
return "UNKNOWN";
}
}
}
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