/*
* Copyright (c) 1998-2010 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Resin Open Source is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
* of NON-INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
* Free SoftwareFoundation, Inc.
* 59 Temple Place, Suite 330
* Boston, MA 02111-1307 USA
*
* @author Scott Ferguson
*/
package com.caucho.xpath.expr;
import com.caucho.util.CharBuffer;
import com.caucho.xpath.Expr;
import com.caucho.xpath.ExprEnvironment;
import com.caucho.xpath.XPathException;
import com.caucho.xpath.pattern.NodeIterator;
import com.caucho.xpath.pattern.SingleNodeIterator;
import org.w3c.dom.Node;
public class VarExpr extends Expr {
private String name;
public VarExpr(String name)
{
this.name = name.intern();
}
/**
* Returns the value of the variable as a boolean.
*
* @param node the current node
* @param env the XPath envivonment
*
* @return the boolean value
*/
public boolean evalBoolean(Node node, ExprEnvironment env)
throws XPathException
{
Var var = (Var) env.getVar(name);
return var == null ? false : var.getBoolean();
}
/**
* Returns the value of the variable as a double.
*
* @param node the current node
* @param env the XPath envivonment
*
* @return the double value
*/
public double evalNumber(Node node, ExprEnvironment env)
throws XPathException
{
Var var = env.getVar(name);
return var == null ? Double.NaN : var.getDouble();
}
/**
* Returns the value of the variable as a string
*
* @param cb the buffer to append the value
* @param node the current node
* @param env the XPath envivonment
*
* @return the string value
*/
public void evalString(CharBuffer cb, Node node, ExprEnvironment env)
throws XPathException
{
Var var = env.getVar(name);
if (var != null)
var.getString(cb);
}
/**
* Returns the value of the variable as a string
*
* @param env the XPath envivonment
* @param node the current node
*
* @return the string value
*/
public String evalString(Node node, ExprEnvironment env)
throws XPathException
{
Var var = env.getVar(name);
return var == null ? "" : var.getString();
}
/**
* Returns the value of the variable as an object
*
* @param env the XPath envivonment
* @param node the current node
*
* @return the value
*/
public Object evalObject(Node node, ExprEnvironment env)
throws XPathException
{
Var var = env.getVar(name);
return var == null ? null : var.getObject();
}
/**
* Returns the value of the variable as an variable
*
* @param node the current node
* @param env the XPath envivonment
*
* @return the value
*/
public Var evalVar(Node node, ExprEnvironment env)
throws XPathException
{
Var var = env.getVar(name);
return var;
}
/**
* Returns the value of the variable as a node set.
*
* @param node the current node
* @param env the variable envivonment
*
* @return the value
*/
public NodeIterator evalNodeSet(Node node, ExprEnvironment env)
throws XPathException
{
Var var = env.getVar(name);
if (var == null)
return new SingleNodeIterator(env, null);
else
return var.getNodeSet(env);
}
public String toString()
{
return "$" + name;
}
}