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      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 package com.android.inputmethod.compat;
     18 
     19 import android.content.Intent;
     20 import android.text.TextUtils;
     21 import android.util.Log;
     22 
     23 import java.lang.reflect.Constructor;
     24 import java.lang.reflect.Field;
     25 import java.lang.reflect.Method;
     26 
     27 public class CompatUtils {
     28     private static final String TAG = CompatUtils.class.getSimpleName();
     29     private static final String EXTRA_INPUT_METHOD_ID = "input_method_id";
     30     // TODO: Can these be constants instead of literal String constants?
     31     private static final String INPUT_METHOD_SUBTYPE_SETTINGS =
     32             "android.settings.INPUT_METHOD_SUBTYPE_SETTINGS";
     33 
     34     public static Intent getInputLanguageSelectionIntent(String inputMethodId,
     35             int flagsForSubtypeSettings) {
     36         // Refer to android.provider.Settings.ACTION_INPUT_METHOD_SUBTYPE_SETTINGS
     37         final String action = INPUT_METHOD_SUBTYPE_SETTINGS;
     38         final Intent intent = new Intent(action);
     39         if (!TextUtils.isEmpty(inputMethodId)) {
     40             intent.putExtra(EXTRA_INPUT_METHOD_ID, inputMethodId);
     41         }
     42         if (flagsForSubtypeSettings > 0) {
     43             intent.setFlags(flagsForSubtypeSettings);
     44         }
     45         return intent;
     46     }
     47 
     48     public static Class<?> getClass(String className) {
     49         try {
     50             return Class.forName(className);
     51         } catch (ClassNotFoundException e) {
     52             return null;
     53         }
     54     }
     55 
     56     public static Method getMethod(Class<?> targetClass, String name,
     57             Class<?>... parameterTypes) {
     58         if (targetClass == null || TextUtils.isEmpty(name)) return null;
     59         try {
     60             return targetClass.getMethod(name, parameterTypes);
     61         } catch (SecurityException e) {
     62             // ignore
     63         } catch (NoSuchMethodException e) {
     64             // ignore
     65         }
     66         return null;
     67     }
     68 
     69     public static Field getField(Class<?> targetClass, String name) {
     70         if (targetClass == null || TextUtils.isEmpty(name)) return null;
     71         try {
     72             return targetClass.getField(name);
     73         } catch (SecurityException e) {
     74             // ignore
     75         } catch (NoSuchFieldException e) {
     76             // ignore
     77         }
     78         return null;
     79     }
     80 
     81     public static Constructor<?> getConstructor(Class<?> targetClass, Class<?> ... types) {
     82         if (targetClass == null || types == null) return null;
     83         try {
     84             return targetClass.getConstructor(types);
     85         } catch (SecurityException e) {
     86             // ignore
     87         } catch (NoSuchMethodException e) {
     88             // ignore
     89         }
     90         return null;
     91     }
     92 
     93     public static Object newInstance(Constructor<?> constructor, Object ... args) {
     94         if (constructor == null) return null;
     95         try {
     96             return constructor.newInstance(args);
     97         } catch (Exception e) {
     98             Log.e(TAG, "Exception in newInstance: " + e.getClass().getSimpleName());
     99         }
    100         return null;
    101     }
    102 
    103     public static Object invoke(
    104             Object receiver, Object defaultValue, Method method, Object... args) {
    105         if (method == null) return defaultValue;
    106         try {
    107             return method.invoke(receiver, args);
    108         } catch (Exception e) {
    109             Log.e(TAG, "Exception in invoke: " + e.getClass().getSimpleName());
    110         }
    111         return defaultValue;
    112     }
    113 
    114     public static Object getFieldValue(Object receiver, Object defaultValue, Field field) {
    115         if (field == null) return defaultValue;
    116         try {
    117             return field.get(receiver);
    118         } catch (Exception e) {
    119             Log.e(TAG, "Exception in getFieldValue: " + e.getClass().getSimpleName());
    120         }
    121         return defaultValue;
    122     }
    123 
    124     public static void setFieldValue(Object receiver, Field field, Object value) {
    125         if (field == null) return;
    126         try {
    127             field.set(receiver, value);
    128         } catch (Exception e) {
    129             Log.e(TAG, "Exception in setFieldValue: " + e.getClass().getSimpleName());
    130         }
    131     }
    132 }
    133