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    • org.ow2.bonita.facade.rest.provider.GenericObjectProvider Maven / Gradle / Ivy

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    /**
 * Copyright (C) 2010  BonitaSoft S.A.
 * BonitaSoft, 31 rue Gustave Eiffel - 38000 Grenoble
 * 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
 * version 2.1 of the License.
 * 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
 * program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth
 * Floor, Boston, MA  02110-1301, USA.
 **/
package org.ow2.bonita.facade.rest.provider;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.util.logging.Level;
import java.util.logging.Logger;

import javax.ws.rs.Consumes;
import javax.ws.rs.Produces;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.MessageBodyReader;
import javax.ws.rs.ext.MessageBodyWriter;
import javax.ws.rs.ext.Provider;

import org.ow2.bonita.facade.CommandAPI;
import org.ow2.bonita.facade.def.element.BusinessArchive;
import org.ow2.bonita.facade.rest.wrapper.RESTObject;
import org.ow2.bonita.util.Misc;
import org.ow2.bonita.util.xml.XStreamUtil;

import com.thoughtworks.xstream.XStream;

/**
 * 
 * @author Elias Ricken de Medeiros, Matthieu Chaffotte
 * 
 */
@Provider
@Consumes("*/*")
@Produces("*/*")
public class GenericObjectProvider implements MessageBodyReader, MessageBodyWriter {

  private static final Logger LOG = Logger.getLogger(GenericObjectProvider.class.getName());

  @Override
  public boolean isReadable(final Class type, final Type genericType, final Annotation[] annotations,
      final MediaType mediaType) {
    if (mediaType.getType().equalsIgnoreCase("application/octet-stream")) {
      return false;
    }
    return isReadableOrWriteable(genericType);
  }

  private boolean isReadableOrWriteable(final Type genericType) {
    boolean isPrimitive = false;
    boolean isReadableorWriteable = true;
    if (genericType != null) {
      if (genericType instanceof Class) {
        isPrimitive = ((Class) genericType).isPrimitive();
      }

      final boolean mustHaveUserProvider = !isPrimitive && !genericType.equals(String.class)
          && !genericType.equals(Boolean.class) && !genericType.equals(BusinessArchive.class)
          && !genericType.equals(boolean[].class);

      isReadableorWriteable = genericType.equals(Object.class) || genericType.equals(CommandAPI.class)
          || mustHaveUserProvider;
    }

    return isReadableorWriteable;
  }

  @Override
  public Object readFrom(final Class type, final Type genericType, final Annotation[] annotations,
      final MediaType mediaType, final MultivaluedMap httpHeaders, final InputStream entityStream)
      throws IOException, WebApplicationException {
    Object ret = null;
    final String content = getContent(entityStream);
    if (content.startsWith("<")) {
      final XStream xstream = XStreamUtil.getDefaultXstream();
      try {
        ret = xstream.fromXML(content);
      } catch (final Exception e) {
        if (LOG.isLoggable(Level.SEVERE)) {
          LOG.severe("Error while decoding " + content + ": " + Misc.getStackTraceFrom(e));
        }
        ret = content;
      }
    } else {
      if (LOG.isLoggable(Level.WARNING)) {
        LOG.warning("The string does not begin with \"<\". It will be considered as a simple String:" + content);
      }
      ret = content;
    }
    try {
      // verify if returned object was wrapped in a RESTObject
      if (ret instanceof RESTObject) {
        final RESTObject restObject = (RESTObject) ret;
        ret = restObject.getObject();
      }
    } catch (final ClassNotFoundException e) {
      if (LOG.isLoggable(Level.SEVERE)) {
        LOG.severe(e.getStackTrace().toString());
      }
    }
    return ret;
  }

  private String getContent(final InputStream entityStream) throws IOException {
    BufferedReader reader = null;
    final StringBuilder builder = new StringBuilder();
    try {
      reader = new BufferedReader(new InputStreamReader(entityStream, "UTF-8"));
      String line = reader.readLine();
      while (line != null) {
        builder.append(line).append("\n");
        line = reader.readLine();
      }
    } catch (final Exception e) {
      if (LOG.isLoggable(Level.SEVERE)) {
        LOG.severe("Error while reading the InputStream: " + Misc.getStackTraceFrom(e));
      }
    } finally {
      if (reader != null) {
        reader.close();
      }
    }
    final String result = builder.toString();
    return result.trim();
  }

  @Override
  public long getSize(final Object t, final Class type, final Type genericType, final Annotation[] annotations,
      final MediaType mediaType) {
    return -1;
  }

  @Override
  public boolean isWriteable(final Class type, final Type genericType, final Annotation[] annotations,
      final MediaType mediaType) {
    if (mediaType.getType().equalsIgnoreCase("application/octet-stream")) {
      return false;
    }
    return isReadableOrWriteable(genericType);
  }

  @Override
  public void writeTo(final Object t, final Class type, final Type genericType, final Annotation[] annotations,
      final MediaType mediaType, final MultivaluedMap httpHeaders, final OutputStream entityStream)
      throws IOException, WebApplicationException {
    final XStream xstream = XStreamUtil.getDefaultXstream();
    try {
      xstream.toXML(t, entityStream);
    } catch (final Exception e) {
      if (LOG.isLoggable(Level.SEVERE)) {
        LOG.severe("Error while writing in the OutputStream: " + Misc.getStackTraceFrom(e));
      }
    }
  }

}
    
    
    
    

    




    
    
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