/*
 * 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.
 * Modified by
 * @author  Data Virtuality GmbH
 * @date    $Date$
 *  
 */

package org.teiid.query.processor.xml;

import static org.teiid.query.analysis.AnalysisRecord.*;

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.logging.LogConstants;
import org.teiid.logging.LogManager;


/**
 * Adds a comment to an element of the document in progress
 */
public class AddCommentInstruction extends ProcessorInstruction {

    private String commentText;

    /**
     * Constructor
     * @param commentText text of the comment
     */
    public AddCommentInstruction(String commentText) {
        this.commentText = commentText;
    }

    /**
     * outputs comment for an XML element (comment node is actually
     * child of XML element node)
     * @see ProcessorInstruction#process(ProcessorEnvironment)
     */
    public XMLContext process(XMLProcessorEnvironment env, XMLContext context)
    throws BlockedException, TeiidComponentException, TeiidProcessingException{

        DocumentInProgress doc = env.getDocumentInProgress();
        
        doc.addComment(this.commentText);         
        LogManager.logTrace(LogConstants.CTX_XML_PLAN, "COMMENT"); //$NON-NLS-1$
        
        env.incrementCurrentProgramCounter();
        return context;
    }

    public String toString() {
        StringBuffer str = new StringBuffer();
        str.append("COMMENT"); //$NON-NLS-1$
        return str.toString();
    }
    
    public PlanNode getDescriptionProperties() {
    	PlanNode props = new PlanNode("COMMENT"); //$NON-NLS-1$        
        props.addProperty(PROP_MESSAGE, this.commentText);
        return props;
    }
    
}
