/*
* 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.pattern;
import com.caucho.xml.CauchoElement;
import com.caucho.xml.CauchoNode;
import com.caucho.xml.QAttr;
import com.caucho.xml.QElement;
import com.caucho.xpath.Env;
import com.caucho.xpath.ExprEnvironment;
import com.caucho.xpath.XPathException;
import org.w3c.dom.Attr;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
/**
* matches attributes of an element.
*/
public class FromAttributes extends Axis {
public FromAttributes(AbstractPattern parent)
{
super(parent);
}
/**
* matches if the node is an attribute.
*
* @param node the current node
* @param env the variable environment
*
* @return true if the pattern matches
*/
public boolean match(Node node, ExprEnvironment env)
throws XPathException
{
if (! (node instanceof Attr))
return false;
if (node instanceof QAttr
&& ((QAttr) node).getNamespaceURI() == XMLNS)
return false;
return _parent == null || _parent.match(node.getParentNode(), env);
}
/**
* The position of the child is the count of previous siblings
* matching the pattern.
*
* Technically, attributes don't have positions, but our DOM allows it.
*/
public int position(Node node, Env env, AbstractPattern pattern)
throws XPathException
{
int count = 1;
for (node = node.getPreviousSibling();
node != null;
node = node.getPreviousSibling()) {
if (pattern.match(node, env))
count++;
}
return count;
}
/**
* counts all siblings matching the pattern.
*/
public int count(Node node, Env env, AbstractPattern pattern)
throws XPathException
{
int count = 0;
CauchoElement parent = (CauchoElement) node.getParentNode();
for (node = parent.getFirstAttribute();
node != null;
node = node.getNextSibling()) {
if (pattern.match(node, env))
count++;
}
return count;
}
/**
* Creates a new node iterator.
*
* @param node the starting node
* @param env the variable environment
* @param match the axis match pattern
*
* @return the node iterator
*/
public NodeIterator createNodeIterator(Node node, ExprEnvironment env,
AbstractPattern match)
throws XPathException
{
if (node instanceof CauchoNode) {
if (_parent == null)
return new AttributeIterator(null, this, node, env, match);
else if (_parent instanceof FromRoot) {
if (node instanceof Document)
return new AttributeIterator(null, this, node, env, match);
else
return new AttributeIterator(null, this, node.getOwnerDocument(),
env, match);
}
NodeIterator parentIter;
parentIter = _parent.createNodeIterator(node, env,
_parent.copyPosition());
return new AttributeIterator(parentIter, this, null, env, match);
}
if (_parent == null)
return new AttributeListIterator(null, env, match);
else if (_parent instanceof FromRoot) {
if (node instanceof Document)
return new AttributeListIterator(null, env, match);
else
return new AttributeListIterator(null, env, match);
}
NodeIterator parentIter;
parentIter = _parent.createNodeIterator(node, env, _parent.copyPosition());
return new AttributeListIterator(parentIter, env, match);
}
/**
* Returns the first node in the selection order.
*
* @param node the current node
*
* @return the first node
*/
public Node firstNode(Node node, ExprEnvironment env)
{
if (node instanceof QElement)
return ((QElement) node).getFirstAttribute();
else
return null;
}
/**
* Returns the next node in the selection order.
*
* @param node the current node
* @param lastNode the last node
*
* @return the next node
*/
public Node nextNode(Node node, Node lastNode)
{
return node.getNextSibling();
}
/**
* Returns true if the pattern is strictly ascending.
*/
public boolean isStrictlyAscending()
{
if (_parent == null)
return true;
else
return _parent.isStrictlyAscending();
}
/**
* Returns true if the two patterns are equal.
*/
public boolean equals(Object b)
{
if (! (b instanceof FromAttributes))
return false;
FromAttributes bPattern = (FromAttributes) b;
return (_parent == bPattern._parent ||
(_parent != null && _parent.equals(bPattern._parent)));
}
public String toString()
{
return getPrefix() + "attribute::";
}
}