/**
 * 
 */
package uk.ac.vamsas.client;

import java.io.DataInput;
import java.io.DataInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.jar.JarInputStream;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * @author jimp
 * LATER: this may not be a necessary or useful class to return from IClientAppdata get*InputStream() methods
 */
public class AppDataInputStream extends DataInputStream implements DataInput {
  private Log log = LogFactory.getLog(AppDataInputStream.class);
  private boolean isOpen = false;
  /**
   * Wrapper for writing to/from AppData Entries in a Vamsas Document.
   */
  public AppDataInputStream(InputStream inputstream) {
    super(inputstream);
    isOpen=true;
  }

  /* (non-Javadoc)
   * @see java.io.FilterInputStream#close()
   */
  public void close() throws IOException {
    if (!isOpen) {
      log.debug("close() called on closed AppDataInputStream.");
      // throw new IOException("Attempt to close an already closed AppDataInputStream");
    } else {
      isOpen=false;
    }
  }

  /**
   * Will return zero if stream has been closed.
   * @see java.io.FilterInputStream#available()
   */
  public int available() throws IOException {
    if (isOpen)
      return super.available();
    else
      return 0;
  }
  
}