Android Open Source - android-http X M L Processor No Dom

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License

The source code is released under:

Apache License

Java Source Code

/*
 * Copyright (C) 2012, 2013 the diamond:dogs|group
 *//w  ww  .  ja va 2 s  .c om
 * 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 at.diamonddogs.service.processor;

import java.io.ByteArrayInputStream;
import java.io.InputStreamReader;

import javax.xml.parsers.SAXParserFactory;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.xml.sax.InputSource;
import org.xml.sax.XMLReader;
import org.xml.sax.helpers.DefaultHandler;

import android.content.Context;
import android.os.Handler;
import android.os.Message;
import at.diamonddogs.data.adapter.ReplyAdapter;
import at.diamonddogs.data.adapter.ReplyAdapter.Status;
import at.diamonddogs.data.dataobjects.WebReply;

/**
 * Xml processor for replies that cannot be handled using a DOM (mostly due to
 * memory issues)
 * 
 * @param <T>
 *            the output type
 * @deprecated this class remains in the code base due to backwards
 *             compatibility reasons. It will receive updates and bugfixes,
 *             however, new code should use {@link SynchronousXmlProcessorNoDom}
 *             instead
 */
@Deprecated
public abstract class XMLProcessorNoDom<T> extends ServiceProcessor<T> {

  private static final Logger LOGGER = LoggerFactory.getLogger(XMLProcessorNoDom.class);

  /**
   * The reader to be used
   */
  protected XMLReader reader;
  /**
   * Instance of the handler for a particular XML document.
   */
  protected XmlProcessorNoDomHandler xmlHandler;

  /**
   * Sets the {@link XmlProcessorNoDomHandler} that will be used to parse the
   * XML
   * 
   * @param handler
   *            the {@link XmlProcessorNoDomHandler}
   */
  public void setXmlHandler(XmlProcessorNoDomHandler handler) {
    try {
      xmlHandler = handler;
      reader = SAXParserFactory.newInstance().newSAXParser().getXMLReader();
      reader.setContentHandler(handler);
    } catch (Throwable tr) {
      LOGGER.warn("Error initializing parser.", tr);
    }
  }

  @Override
  public void processWebReply(Context c, ReplyAdapter r, Handler handler) {
    if (r.getStatus() == Status.OK) {
      try {
        byte[] data = ((WebReply) r.getReply()).getData();
        InputSource inSource = new InputSource(new InputStreamReader(new ByteArrayInputStream(data)));
        reader.parse(inSource);
        handler.sendMessage(createReturnMessage(xmlHandler.getData()));
      } catch (Throwable tr) {
        LOGGER.warn("Failed to parse document", tr);
        handler.sendMessage(createErrorMessage(tr, r));
      }
    }
  }

  protected abstract Message createReturnMessage(T data);

  /**
   * Wrapper for {@link DefaultHandler} that allows obtaining the data object
   */
  public abstract class XmlProcessorNoDomHandler extends DefaultHandler {
    /**
     * Gets the data object created by the handler
     * 
     * @return the data object
     */
    public abstract T getData();
  }
}

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