ObjectFormat.java revision 65953da4636fbf5f0a24b8f5f2b5fa7d76ff13d9 
1/*
2 * Copyright (C) 2011 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17
18package android.filterfw.format;
19
20import android.filterfw.core.FrameFormat;
21import android.filterfw.core.MutableFrameFormat;
22import android.filterfw.core.NativeBuffer;
23
24/**
25 * @hide
26 */
27public class ObjectFormat {
28
29    public static MutableFrameFormat fromClass(Class clazz, int count, int target) {
30        // Create frame format
31        MutableFrameFormat result = new MutableFrameFormat(FrameFormat.TYPE_OBJECT, target);
32        result.setObjectClass(getBoxedClass(clazz));
33        if (count != FrameFormat.SIZE_UNSPECIFIED) {
34            result.setDimensions(count);
35        }
36        result.setBytesPerSample(bytesPerSampleForClass(clazz, target));
37        return result;
38    }
39
40    public static MutableFrameFormat fromClass(Class clazz, int target) {
41        return fromClass(clazz, FrameFormat.SIZE_UNSPECIFIED, target);
42    }
43
44    public static MutableFrameFormat fromObject(Object object, int target) {
45        return object == null
46            ? new MutableFrameFormat(FrameFormat.TYPE_OBJECT, target)
47            : fromClass(object.getClass(), FrameFormat.SIZE_UNSPECIFIED, target);
48    }
49
50    public static MutableFrameFormat fromObject(Object object, int count, int target) {
51        return object == null
52            ? new MutableFrameFormat(FrameFormat.TYPE_OBJECT, target)
53            : fromClass(object.getClass(), count, target);
54    }
55
56    private static int bytesPerSampleForClass(Class clazz, int target) {
57        // Native targets have objects manifested in a byte buffer. Thus it is important to
58        // correctly determine the size of single element here.
59        if (target == FrameFormat.TARGET_NATIVE) {
60            if (!NativeBuffer.class.isAssignableFrom(clazz)) {
61                throw new IllegalArgumentException("Native object-based formats must be of a " +
62                    "NativeBuffer subclass! (Received class: " + clazz + ").");
63            }
64            try {
65                return ((NativeBuffer)clazz.newInstance()).getElementSize();
66            } catch (Exception e) {
67                throw new RuntimeException("Could not determine the size of an element in a "
68                    + "native object-based frame of type " + clazz + "! Perhaps it is missing a "
69                    + "default constructor?");
70            }
71        } else {
72            return FrameFormat.BYTES_PER_SAMPLE_UNSPECIFIED;
73        }
74    }
75
76    private static Class getBoxedClass(Class type) {
77        // Check if type is primitive
78        if (type.isPrimitive()) {
79            // Yes -> box it
80            if (type == boolean.class) {
81                return java.lang.Boolean.class;
82            } else if (type == byte.class) {
83                return java.lang.Byte.class;
84            } else if (type == char.class) {
85                return java.lang.Character.class;
86            } else if (type == short.class) {
87                return java.lang.Short.class;
88            } else if (type == int.class) {
89                return java.lang.Integer.class;
90            } else if (type == long.class) {
91                return java.lang.Long.class;
92            } else if (type == float.class) {
93                return java.lang.Float.class;
94            } else if (type == double.class) {
95                return java.lang.Double.class;
96            } else {
97                throw new IllegalArgumentException(
98                    "Unknown primitive type: " + type.getSimpleName() + "!");
99            }
100        } else {
101            // No -> return it
102            return type;
103        }
104    }
105}
106