content: /*
   * Copyright (C) 2014 The Android Open Source Project
   *
   * 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 android.hardware.camera2.marshal;
  
  import android.hardware.camera2.utils.TypeReference;
  
  /**
   * Query if a marshaler can marshal to/from a particular native and managed type; if it supports
   * the combination, allow creating a marshaler instance to do the serialization.
   *
   * <p>Not all queryable instances will support exactly one combination. Some, such as the
   * primitive queryable will support all primitive to/from managed mappings (as long as they are
   * 1:1). Others, such as the rectangle queryable will only support integer to rectangle mappings.
   * </p>
   *
   * <p>Yet some others are codependent on other queryables; e.g. array queryables might only support
   * a type map for {@code T[]} if another queryable exists with support for the component type
   * {@code T}.</p>
   */
  public interface MarshalQueryable<T> {
      /**
       * Create a marshaler between the selected managed and native type.
       *
       * <p>This marshaler instance is only good for that specific type mapping; and will refuse
       * to map other managed types, other native types, or an other combination that isn't
       * this exact one.</p>
       *
       * @param managedType a managed type reference
       * @param nativeType the native type, e.g.
       *          {@link android.hardware.camera2.impl.CameraMetadataNative#TYPE_BYTE TYPE_BYTE}
       * @return
       *
       * @throws UnsupportedOperationException
       *          if {@link #isTypeMappingSupported} returns {@code false}
       */
      public Marshaler<T> createMarshaler(
              TypeReference<T> managedType, int nativeType);
  
      /**
       * Determine whether or not this query marshal is able to create a marshaler that will
       * support the managed type and native type mapping.
       *
       * <p>If this returns {@code true}, then a marshaler can be instantiated by
       * {@link #createMarshaler} that will marshal data to/from the native type
       * from/to the managed type.</p>
       *
       * <p>Most marshalers are likely to only support one type map.</p>
       */
      public boolean isTypeMappingSupported(TypeReference<T> managedType, int nativeType);
  }
  