content: /*
   * Copyright (C) 2011 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.filterfw.format;
  
  import android.filterfw.core.FrameFormat;
  import android.filterfw.core.MutableFrameFormat;
  import android.filterfw.core.NativeBuffer;
  
  /**
   * @hide
   */
  public class ObjectFormat {
  
      public static MutableFrameFormat fromClass(Class clazz, int count, int target) {
          // Create frame format
          MutableFrameFormat result = new MutableFrameFormat(FrameFormat.TYPE_OBJECT, target);
          result.setObjectClass(getBoxedClass(clazz));
          if (count != FrameFormat.SIZE_UNSPECIFIED) {
              result.setDimensions(count);
          }
          result.setBytesPerSample(bytesPerSampleForClass(clazz, target));
          return result;
      }
  
      public static MutableFrameFormat fromClass(Class clazz, int target) {
          return fromClass(clazz, FrameFormat.SIZE_UNSPECIFIED, target);
      }
  
      public static MutableFrameFormat fromObject(Object object, int target) {
          return object == null
              ? new MutableFrameFormat(FrameFormat.TYPE_OBJECT, target)
              : fromClass(object.getClass(), FrameFormat.SIZE_UNSPECIFIED, target);
      }
  
      public static MutableFrameFormat fromObject(Object object, int count, int target) {
          return object == null
              ? new MutableFrameFormat(FrameFormat.TYPE_OBJECT, target)
              : fromClass(object.getClass(), count, target);
      }
  
      private static int bytesPerSampleForClass(Class clazz, int target) {
          // Native targets have objects manifested in a byte buffer. Thus it is important to
          // correctly determine the size of single element here.
          if (target == FrameFormat.TARGET_NATIVE) {
              if (!NativeBuffer.class.isAssignableFrom(clazz)) {
                  throw new IllegalArgumentException("Native object-based formats must be of a " +
                      "NativeBuffer subclass! (Received class: " + clazz + ").");
              }
              try {
                  return ((NativeBuffer)clazz.newInstance()).getElementSize();
              } catch (Exception e) {
                  throw new RuntimeException("Could not determine the size of an element in a "
                      + "native object-based frame of type " + clazz + "! Perhaps it is missing a "
                      + "default constructor?");
              }
          } else {
              return FrameFormat.BYTES_PER_SAMPLE_UNSPECIFIED;
          }
      }
  
      private static Class getBoxedClass(Class type) {
          // Check if type is primitive
          if (type.isPrimitive()) {
              // Yes -> box it
              if (type == boolean.class) {
                  return java.lang.Boolean.class;
              } else if (type == byte.class) {
                  return java.lang.Byte.class;
              } else if (type == char.class) {
                  return java.lang.Character.class;
              } else if (type == short.class) {
                  return java.lang.Short.class;
              } else if (type == int.class) {
                  return java.lang.Integer.class;
              } else if (type == long.class) {
                  return java.lang.Long.class;
              } else if (type == float.class) {
                  return java.lang.Float.class;
              } else if (type == double.class) {
                  return java.lang.Double.class;
              } else {
                  throw new IllegalArgumentException(
                      "Unknown primitive type: " + type.getSimpleName() + "!");
              }
          } else {
              // No -> return it
              return type;
          }
      }
  }
  