/*
* JBoss, Home of Professional Open Source.
* See the COPYRIGHT.txt file distributed with this work for information
* regarding copyright ownership. Some portions may be licensed
* to Red Hat, Inc. under one or more contributor license agreements.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA.
*/
package org.teiid.query.processor.xml;
import org.teiid.client.plan.PlanNode;
import org.teiid.common.buffer.BlockedException;
import org.teiid.core.TeiidComponentException;
import org.teiid.core.TeiidProcessingException;
import org.teiid.core.util.Assertion;
import org.teiid.logging.LogManager;
import org.teiid.query.QueryPlugin;
import org.xml.sax.SAXException;
/**
*/
public class MoveDocInstruction extends ProcessorInstruction {
public static final int UP = 0;
public static final int DOWN = 1;
private int direction;
/**
* Constructor for MoveDocInstruction.
*/
public MoveDocInstruction(int direction) {
this.direction = direction;
}
/**
* @see ProcessorInstruction#process(ProcessorEnvironment)
*/
public XMLContext process(XMLProcessorEnvironment env, XMLContext context)
throws BlockedException, TeiidComponentException, TeiidProcessingException{
DocumentInProgress doc = env.getDocumentInProgress();
switch(this.direction) {
case UP:
LogManager.logTrace(org.teiid.logging.LogConstants.CTX_XML_PLAN, "UP in document"); //$NON-NLS-1$
try {
doc.moveToParent();
} catch (SAXException err) {
throw new TeiidComponentException(err, "Failed to move UP in document"); //$NON-NLS-1$
}
break;
case DOWN:
LogManager.logTrace(org.teiid.logging.LogConstants.CTX_XML_PLAN, "LAST child in document"); //$NON-NLS-1$
doc.moveToLastChild();
break;
default:
Assertion.failed(QueryPlugin.Util.getString("ERR.015.006.0051", direction)); //$NON-NLS-1$
break;
}
env.incrementCurrentProgramCounter();
return context;
}
public String toString() {
if(direction == UP) {
return "UP"; //$NON-NLS-1$
}
return "LAST"; //$NON-NLS-1$
}
public PlanNode getDescriptionProperties() {
if(direction == UP) {
return new PlanNode("UP IN DOCUMENT"); //$NON-NLS-1$
}
return new PlanNode("NEXT IN DOCUMENT"); //$NON-NLS-1$
}
}