/*
  *
  *  *  Copyright 2014 Orient Technologies LTD (info(at)orientechnologies.com)
  *  *
  *  *  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.
  *  *
  *  * For more information: http://www.orientechnologies.com
  *
  */
package com.orientechnologies.orient.core.serialization.serializer.stream;

import com.orientechnologies.common.exception.OException;
import com.orientechnologies.orient.core.exception.OSerializationException;
import com.orientechnologies.orient.core.id.ORID;
import com.orientechnologies.orient.core.id.ORecordId;
import com.orientechnologies.orient.core.record.ORecord;
import com.orientechnologies.orient.core.serialization.OBinaryProtocol;

import java.io.IOException;
import java.lang.reflect.Constructor;

/**
 * Allow short and long form. Examples: <br>
 * Short form: @[type][RID] where type = 1 byte<br>
 * Long form: org.myapp.Myrecord|[RID]<br>
 * 
 * @author Luca Garulli
 * 
 */
public class OStreamSerializerAnyRecord implements OStreamSerializer {
  public static final String                     NAME     = "ar";
  public static final OStreamSerializerAnyRecord INSTANCE = new OStreamSerializerAnyRecord();

  /**
   * Re-Create any object if the class has a public constructor that accepts a String as unique parameter.
   */
  public Object fromStream(byte[] iStream) throws IOException {
    if (iStream == null || iStream.length == 0)
      // NULL VALUE
      return null;

    final String stream = new String(iStream,"UTF-8");

    Class<?> cls = null;

    try {
      final StringBuilder content = new StringBuilder(1024);
      cls = OStreamSerializerHelper.readRecordType(stream, content);

      // TRY WITH THE DATABASE CONSTRUCTOR
      for (Constructor<?> c : cls.getDeclaredConstructors()) {
        Class<?>[] params = c.getParameterTypes();

        if (params.length == 2 && params[1].equals(ORID.class)) {
          ORecord rec = (ORecord) c.newInstance(new ORecordId(content.toString()));
          // rec.load();
          return rec;
        }
      }
    } catch (Exception e) {
      throw OException.wrapException(
          new OSerializationException("Error on unmarshalling content. Class " + (cls != null ? cls.getName() : "?")), e);
    }

    throw new OSerializationException("Cannot unmarshall the record since the serialized object of class "
        + (cls != null ? cls.getSimpleName() : "?") + " has no constructor with suitable parameters: (ORID)");
  }

  public byte[] toStream(Object iObject) throws IOException {
    if (iObject == null)
      return null;

    if (((ORecord) iObject).getIdentity() == null)
      throw new OSerializationException("Cannot serialize record without identity. Store it before serialization.");

    final StringBuilder buffer = OStreamSerializerHelper.writeRecordType(iObject.getClass(), new StringBuilder(1024));
    buffer.append(((ORecord) iObject).getIdentity().toString());

    return buffer.toString().getBytes("UTF-8");
  }

  public String getName() {
    return NAME;
  }
}