/*
* 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.XPathFun;
import com.caucho.xpath.pattern.AbstractPattern;
import org.w3c.dom.Node;
import java.util.ArrayList;
/**
* Expressions based on custom library extensions.
*/
public class FunExpr extends Expr {
private String _name;
private AbstractPattern _pattern;
private ArrayList<Expr> _args;
public FunExpr(String name, AbstractPattern pattern, ArrayList<Expr> args)
{
_name = name;
_pattern = pattern;
_args = args;
}
public boolean evalBoolean(Node node, ExprEnvironment env)
throws XPathException
{
return toBoolean(evalObject(node, env));
}
public double evalNumber(Node node, ExprEnvironment env)
throws XPathException
{
return toDouble(evalObject(node, env));
}
public String evalString(Node node, ExprEnvironment env)
throws XPathException
{
return toString(evalObject(node, env));
}
public Object evalObject(Node node, ExprEnvironment env)
throws XPathException
{
XPathFun fun = env.getFunction(_name);
// XXX: need to propagate the exception
if (fun == null)
throw new RuntimeException("unknown function: " + _name);
ArrayList<Object> values = new ArrayList<Object>();
for (int i = 0; i < _args.size(); i++) {
Expr expr = _args.get(i);
values.add(expr.evalObject(node, env));
}
return fun.eval(node, env, _pattern, values);
}
public String toString()
{
CharBuffer cb = new CharBuffer();
cb.append(_name);
cb.append("(");
for (int i = 0; i < _args.size(); i++) {
if (i != 0)
cb.append(", ");
cb.append(_args.get(i));
}
cb.append(")");
return cb.toString();
}
}