/*
 *
 *  *  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.log.OLogManager;
import com.orientechnologies.orient.core.entity.OClassDictionary;
import com.orientechnologies.orient.core.exception.OSerializationException;

/**
 * Abstract class. Allows 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 OStreamSerializerHelper {

  public static final String SEPARATOR         = "|";
  private static final char  SHORT_FORM_PREFIX = '!';

  public static StringBuilder writeRecordType(final Class<?> cls, final StringBuilder iBuffer) {
    // SEARCH INTO THE SERIALIZER REGISTER IF THE IMPLEMENTATION WAS REGISTERED TO GET THE SHORT FORM (AND OPTIMIZING IN SIZE AND
    // WRITE TIMES)
    Character c = OClassDictionary.instance().getCodeByClass(cls);
    if (c != null) {
      // FOUND: WRITE THE SHORT FORM
      iBuffer.append(SHORT_FORM_PREFIX);
      iBuffer.append(c);
    } else {
      // NOT FOUND: PROBABLY A CUSTOM IMPL: WRITE THE FULL CLASS NAME
      iBuffer.append(cls.getName());
      iBuffer.append(SEPARATOR);
    }
    return iBuffer;
  }

  public static Class<?> readRecordType(final String iBuffer, final StringBuilder iContent) throws ClassNotFoundException {
    Class<?> cls;
    final int pos;
    if (iBuffer.charAt(0) == SHORT_FORM_PREFIX) {
      // SHORT FORM
      cls = OClassDictionary.instance().getClassByCode(iBuffer.charAt(1));
      pos = 1;
    } else {
      // LONG FORM
      pos = iBuffer.indexOf(SEPARATOR);
      if (pos < 0) {
        final String message = "Class signature not found in the buffer: " + iBuffer;
        OLogManager.instance().error(null, message);

        throw new OSerializationException(message);
      }

      final String className = iBuffer.substring(0, pos);
      cls = Class.forName(className);
    }

    // SET THE CONTENT
    iContent.append(iBuffer.substring(pos + 1));

    return cls;
  }
}