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Spring Data integration for Couchbase

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/*
 * Copyright 2012-2015 the original author or authors
 *
 * 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 org.springframework.data.couchbase.core.convert;

import org.springframework.data.convert.EntityConverter;
import org.springframework.data.convert.EntityReader;
import org.springframework.data.couchbase.core.mapping.CouchbaseDocument;
import org.springframework.data.couchbase.core.mapping.CouchbasePersistentEntity;
import org.springframework.data.couchbase.core.mapping.CouchbasePersistentProperty;

/**
 * Marker interface for the converter, identifying the types to and from that can be converted.
 *
 * @author Michael Nitschinger
 * @author Simon Baslé
 */
public interface CouchbaseConverter
    extends EntityConverter,
    CouchbasePersistentProperty, Object, CouchbaseDocument>,
    CouchbaseWriter,
    EntityReader {

  /**
   * Convert the value if necessary to the class that would actually be stored,
   * or leave it as is if no conversion needed.
   *
   * @param value the value to be converted to the class that would actually be stored.
   * @return the converted value (or the same value if no conversion necessary).
   */
  Object convertForWriteIfNeeded(Object value);

  /**
   * Return the Class that would actually be stored for a given Class.
   *
   * @param clazz the source class.
   * @return the target class that would actually be stored.
   * @see #convertForWriteIfNeeded(Object)
   */
  Class getWriteClassFor(Class clazz);

  /**
   * @return the name of the field that will hold type information.
   */
  String getTypeKey();
}