package client.net.sf.saxon.ce.expr;
import client.net.sf.saxon.ce.om.Item;
import client.net.sf.saxon.ce.om.NodeInfo;
import client.net.sf.saxon.ce.trans.XPathException;
/**
* Class ParentNodeExpression represents the XPath expression ".." or "parent::node()"
*/
public class ParentNodeExpression extends SingleNodeExpression {
/**
* Customize the error message on type checking
*/
protected String noContextMessage() {
return "Cannot select the parent of the context node";
}
/**
* Return the node selected by this SingleNodeExpression
* @param context The context for the evaluation
* @return the parent of the current node defined by the context
*/
public NodeInfo getNode(XPathContext context) throws XPathException {
Item item = context.getContextItem();
if (item==null) {
dynamicError("The context item is not set", "XPDY0002", context);
}
if (item instanceof NodeInfo) {
return ((NodeInfo)item).getParent();
} else {
dynamicError("The context item for the parent axis (..) is not a node", "XPTY0020", context);
return null;
}
}
/**
* Copy an expression. This makes a deep copy.
*
* @return the copy of the original expression
*/
private Expression copy() {
return new ParentNodeExpression();
}
/**
* Determine which aspects of the context the expression depends on. The result is
* a bitwise-or'ed value composed from constants such as XPathContext.VARIABLES and
* XPathContext.CURRENT_NODE
*/
/*
public int getDependencies() {
return StaticProperty.CONTEXT_ITEM;
}
*/
/**
* Is this expression the same as another expression?
*/
public boolean equals(Object other) {
return (other instanceof ParentNodeExpression);
}
/**
* get HashCode for comparing two expressions
*/
public int hashCode() {
return "ParentNodeExpression".hashCode();
}
/**
* The toString() method for an expression attempts to give a representation of the expression
* in an XPath-like form, but there is no guarantee that the syntax will actually be true XPath.
* In the case of XSLT instructions, the toString() method gives an abstracted view of the syntax
*/
public String toString() {
return "..";
}
}
// This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
// If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
// This Source Code Form is “Incompatible With Secondary Licenses”, as defined by the Mozilla Public License, v. 2.0.