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/*
* Copyright (C) 2013 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.impl;
import java.nio.ByteBuffer;
public interface MetadataMarshalClass<T> {
/**
* Marshal the specified object instance (value) into a byte buffer.
*
* @param value the value of type T that we wish to write into the byte buffer
* @param buffer the byte buffer into which the marshalled object will be written
* @param nativeType the native type, e.g.
* {@link android.hardware.camera2.CameraMetadata#TYPE_BYTE TYPE_BYTE}.
* Guaranteed to be one for which isNativeTypeSupported returns true.
* @param sizeOnly if this is true, don't write to the byte buffer. calculate the size only.
* @return the size that needs to be written to the byte buffer
*/
int marshal(T value, ByteBuffer buffer, int nativeType, boolean sizeOnly);
/**
* Unmarshal a new object instance from the byte buffer.
* @param buffer the byte buffer, from which we will read the object
* @param nativeType the native type, e.g.
* {@link android.hardware.camera2.CameraMetadata#TYPE_BYTE TYPE_BYTE}.
* Guaranteed to be one for which isNativeTypeSupported returns true.
* @return a new instance of type T read from the byte buffer
*/
T unmarshal(ByteBuffer buffer, int nativeType);
Class<T> getMarshalingClass();
/**
* Determines whether or not this marshaller supports this native type. Most marshallers
* will are likely to only support one type.
*
* @param nativeType the native type, e.g.
* {@link android.hardware.camera2.CameraMetadata#TYPE_BYTE TYPE_BYTE}
* @return true if it supports, false otherwise
*/
boolean isNativeTypeSupported(int nativeType);
public static int NATIVE_SIZE_DYNAMIC = -1;
/**
* How many bytes T will take up if marshalled to/from nativeType
* @param nativeType the native type, e.g.
* {@link android.hardware.camera2.CameraMetadata#TYPE_BYTE TYPE_BYTE}
* @return a size in bytes, or NATIVE_SIZE_DYNAMIC if the size is dynamic
*/
int getNativeSize(int nativeType);
}
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