Package org.teiid.query.processor.xml

Source Code of org.teiid.query.processor.xml.InitializeDocumentInstruction

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* 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 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.LogManager;
import org.teiid.query.mapping.xml.MappingNodeConstants;


/**
* Should be the first instruction of any document.  Initializes the encoding
* and formatting of a document in the XML results.
*/
public class InitializeDocumentInstruction extends ProcessorInstruction {

    private String encoding;
    private boolean isFormatted;

    /**
     * Constructor for InitializeDocumentInstruction.
     */
    public InitializeDocumentInstruction() {
        super();
        this.encoding = MappingNodeConstants.Defaults.DEFAULT_DOCUMENT_ENCODING;
        this.isFormatted = MappingNodeConstants.Defaults.DEFAULT_FORMATTED_DOCUMENT.booleanValue();
    }

    /**
     * Constructor for InitializeDocumentInstruction.
     * @param encoding The encoding of the XML results doc
     * @param isFormatted true means human-readable form, false means
     * compacted machine-readable form
     */
    public InitializeDocumentInstruction(String encoding, boolean isFormatted) {
        super();
        this.encoding = encoding;
        this.isFormatted = isFormatted;
    }

    /**
     * Sets the format in which XML results are returned
     * @param isFormatted true means human-readable form, false means
     * compacted machine-readable form
     */   
  void setXMLFormat(boolean isFormatted) {
    this.isFormatted = isFormatted;
  }

    /**
     * @see ProcessorInstruction#getCapabilities(ProcessorEnvironment, DocumentInProgress)
     */
    public XMLContext process(XMLProcessorEnvironment env, XMLContext context)
        throws BlockedException, TeiidComponentException, TeiidProcessingException{
           
        LogManager.logTrace(org.teiid.logging.LogConstants.CTX_XML_PLAN, "DOC begin"); //$NON-NLS-1$

        // Only process this instruction if there are no recursive programs in the
        // program stack (don't want to start a new doc in the middle of
        // recursive processing)
        if (!env.isRecursiveProgramInStack()) {
          DocumentInProgress doc = new DocumentInProgress(env.getBufferManager().createFileStore("xml"), encoding); //$NON-NLS-1$
            //DocumentInProgress doc = new JDOMDocumentInProgress();
            env.setDocumentInProgress(doc);
               
            // Override the xml format flag from the model with
            // the format specified with the user's query request, if any.
            boolean formatted = this.isFormatted;
            String xmlFormat = env.getXMLFormat();
            if(xmlFormat != null) {
                if(xmlFormat.equalsIgnoreCase(XMLPlan.XML_TREE_FORMAT)) {
                    formatted = true;
                } else if (xmlFormat.equalsIgnoreCase(XMLPlan.XML_COMPACT_FORMAT)) {
                    formatted = false;
                }
            }

            doc.setDocumentFormat(formatted);
        }
           
        env.incrementCurrentProgramCounter();
        return context;
    }

    public String toString() {
        return "DOC  encoding: " + encoding + ", is formatted: " + isFormatted; //$NON-NLS-1$ //$NON-NLS-2$
    }

    public PlanNode getDescriptionProperties() {
        PlanNode props = new PlanNode("START DOCUMENT"); //$NON-NLS-1$

        props.addProperty(PROP_ENCODING, this.encoding);
        props.addProperty(PROP_FORMATTED, String.valueOf(this.isFormatted));
               
        return props;
    }

}
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