/*
* Copyright (c) 1998-2011 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.NodeArrayListIterator;
import com.caucho.xpath.pattern.NodeIterator;
import com.caucho.xpath.pattern.NodeListIterator;
import com.caucho.xpath.pattern.SingleNodeIterator;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import java.util.ArrayList;
public abstract class Var {
/**
* Returns the value as a boolean.
*/
boolean getBoolean()
throws XPathException
{
return Expr.toBoolean(getObject());
}
/**
* Returns the value as a double.
*/
double getDouble()
throws XPathException
{
Object o = getObject();
return Expr.toDouble(getObject());
}
/**
* Returns the value as a string.
*/
String getString()
throws XPathException
{
return Expr.toString(getObject());
}
/**
* Returns the value as a string.
*/
void getString(CharBuffer cb)
throws XPathException
{
cb.append(getString());
}
/**
* Returns the value as a node set.
*/
NodeIterator getNodeSet(ExprEnvironment env)
throws XPathException
{
Object obj = getObject();
if (obj instanceof Node)
return new SingleNodeIterator(env, (Node) obj);
else if (obj instanceof NodeList)
return new NodeListIterator(env, (NodeList) obj);
else if (obj instanceof ArrayList)
return new NodeArrayListIterator(env, (ArrayList) obj);
else
return new SingleNodeIterator(env, null);
}
/**
* Returns the value as an object.
*/
abstract Object getObject();
/**
* Frees the var.
*/
public void free()
{
}
}