CompatUtils.java revision 298b4240f84344bbcd70b72dfb20806ba93ffd22 
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
17package com.android.inputmethod.compat;
18
19import android.text.TextUtils;
20import android.util.Log;
21
22import java.lang.reflect.Constructor;
23import java.lang.reflect.Field;
24import java.lang.reflect.Method;
25
26public final class CompatUtils {
27    private static final String TAG = CompatUtils.class.getSimpleName();
28
29    private CompatUtils() {
30        // This utility class is not publicly instantiable.
31    }
32
33    public static Class<?> getClass(final String className) {
34        try {
35            return Class.forName(className);
36        } catch (ClassNotFoundException e) {
37            return null;
38        }
39    }
40
41    public static Method getMethod(final Class<?> targetClass, final String name,
42            final Class<?>... parameterTypes) {
43        if (targetClass == null || TextUtils.isEmpty(name)) return null;
44        try {
45            return targetClass.getMethod(name, parameterTypes);
46        } catch (SecurityException e) {
47            // ignore
48        } catch (NoSuchMethodException e) {
49            // ignore
50        }
51        return null;
52    }
53
54    public static Field getField(final Class<?> targetClass, final String name) {
55        if (targetClass == null || TextUtils.isEmpty(name)) return null;
56        try {
57            return targetClass.getField(name);
58        } catch (SecurityException e) {
59            // ignore
60        } catch (NoSuchFieldException e) {
61            // ignore
62        }
63        return null;
64    }
65
66    public static Constructor<?> getConstructor(final Class<?> targetClass,
67            final Class<?> ... types) {
68        if (targetClass == null || types == null) return null;
69        try {
70            return targetClass.getConstructor(types);
71        } catch (SecurityException e) {
72            // ignore
73        } catch (NoSuchMethodException e) {
74            // ignore
75        }
76        return null;
77    }
78
79    public static Object newInstance(final Constructor<?> constructor, final Object ... args) {
80        if (constructor == null) return null;
81        try {
82            return constructor.newInstance(args);
83        } catch (Exception e) {
84            Log.e(TAG, "Exception in newInstance: " + e.getClass().getSimpleName());
85        }
86        return null;
87    }
88
89    public static Object invoke(final Object receiver, final Object defaultValue,
90            final Method method, final Object... args) {
91        if (method == null) return defaultValue;
92        try {
93            return method.invoke(receiver, args);
94        } catch (Exception e) {
95            Log.e(TAG, "Exception in invoke: " + e.getClass().getSimpleName());
96        }
97        return defaultValue;
98    }
99
100    public static Object getFieldValue(final Object receiver, final Object defaultValue,
101            final Field field) {
102        if (field == null) return defaultValue;
103        try {
104            return field.get(receiver);
105        } catch (Exception e) {
106            Log.e(TAG, "Exception in getFieldValue: " + e.getClass().getSimpleName());
107        }
108        return defaultValue;
109    }
110
111    public static void setFieldValue(final Object receiver, final Field field, final Object value) {
112        if (field == null) return;
113        try {
114            field.set(receiver, value);
115        } catch (Exception e) {
116            Log.e(TAG, "Exception in setFieldValue: " + e.getClass().getSimpleName());
117        }
118    }
119}
120