PDIImportUtil.java

/*!
 * Copyright 2010 - 2016 Pentaho Corporation.  All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */
package com.pentaho.repository.importexport;

import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.StringWriter;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.Result;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.apache.commons.io.IOUtils;
import org.pentaho.di.core.exception.KettleException;
import org.pentaho.di.core.logging.LogChannel;
import org.pentaho.di.core.logging.LogChannelInterface;
import org.pentaho.di.core.xml.XMLParserFactoryProducer;
import org.pentaho.di.repository.Repository;
import org.pentaho.di.repository.utils.IRepositoryFactory;
import org.w3c.dom.Document;
import org.xml.sax.SAXException;

public class PDIImportUtil {

  private static IRepositoryFactory repositoryFactory = new IRepositoryFactory.CachingRepositoryFactory();
  private static final LogChannelInterface log = new LogChannel( PDIImportUtil.class );

  /**
   * Connects to the PDI repository
   * 
   * @param repositoryName
   * @return
   * @throws KettleException
   */
  public static Repository connectToRepository( String repositoryName ) throws KettleException {
    return repositoryFactory.connect( repositoryName );
  }

  public static void setRepositoryFactory( IRepositoryFactory factory ) {
    repositoryFactory = factory;
  }

  public static Document loadXMLFrom( String xml ) throws SAXException, IOException {
    return loadXMLFrom( new ByteArrayInputStream( xml.getBytes() ) );
  }

  /**
   * @return instance of {@link Document}, if xml is loaded successfully null in case any error occurred during loading
   */
  public static Document loadXMLFrom( InputStream is ) {
    DocumentBuilderFactory factory;
    try {
      factory = XMLParserFactoryProducer.createSecureDocBuilderFactory();
    } catch ( ParserConfigurationException e ) {
      log.logError( e.getLocalizedMessage() );
      factory = DocumentBuilderFactory.newInstance();
    }
    DocumentBuilder builder = null;
    Document doc = null;
    try {
      builder = factory.newDocumentBuilder();
    } catch ( ParserConfigurationException ex ) {
      // ignore
    }
    try {
      File file = File.createTempFile( "tempFile", "temp" );
      file.deleteOnExit();
      FileOutputStream fous = new FileOutputStream( file );
      IOUtils.copy( is, fous );
      fous.flush();
      fous.close();
      doc = builder.parse( file );
    } catch ( IOException | SAXException e ) {
      log.logError( e.getLocalizedMessage() );
    } finally {
      try {
        is.close();
      } catch ( IOException e ) {
        // nothing to do here
      }
    }
    return doc;
  }

  public static String asXml( Document document ) {
    try {
      Source source = new DOMSource( document.getParentNode() );
      StringWriter stringWriter = new StringWriter();
      Result result = new StreamResult( stringWriter );
      TransformerFactory factory = TransformerFactory.newInstance();
      Transformer transformer = factory.newTransformer();
      transformer.transform( source, result );
      return stringWriter.getBuffer().toString();
    } catch ( TransformerConfigurationException e ) {
      e.printStackTrace();
      return null;
    } catch ( TransformerException e ) {
      e.printStackTrace();
      return null;
    }
  }


}