/*
* 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.functions;
import com.caucho.util.L10N;
import com.caucho.xml.XmlPrinter;
import com.caucho.xpath.Expr;
import com.caucho.xpath.ExprEnvironment;
import com.caucho.xpath.XPathException;
import com.caucho.xpath.XPathParseException;
import com.caucho.xpath.expr.AbstractStringExpr;
import com.caucho.xpath.pattern.NodeIterator;
import org.w3c.dom.Node;
import java.io.IOException;
/**
* Traces an object.
*/
public class Trace extends AbstractStringExpr {
private static final L10N L = new L10N(ResolveURI.class);
private Expr _expr;
private Expr _labelExpr;
public Trace(Expr expr, Expr labelExpr)
throws XPathParseException
{
_expr = expr;
_labelExpr = labelExpr;
if (expr == null)
throw new XPathParseException(L.l("fn:trace(value,[label])"));
}
/**
* Evaluates the expression as an string.
*
* @param node the current node
* @param env the variable environment.
*
* @return the string representation of the expression.
*/
public String evalString(Node node, ExprEnvironment env)
throws XPathException
{
Object value = _expr.evalObject(node, env);
if (value instanceof NodeIterator) {
NodeIterator iter = (NodeIterator) value;
while (iter.hasNext()) {
Node subnode = iter.next();
XmlPrinter printer = new XmlPrinter(System.out);
try {
printer.printPrettyXml(subnode);
} catch (IOException e) {
}
}
}
else if (value instanceof Node) {
Node subnode = (Node) value;
XmlPrinter printer = new XmlPrinter(System.out);
try {
printer.printPrettyXml(subnode);
} catch (IOException e) {
}
}
else
System.out.println(value);
return "";
}
public String toString()
{
return "fn:trace(" + _expr + ")";
}
}