1 files changed, 218 insertions, 0 deletions
diff --git a/java/src/org/kelar/inputmethod/compat/CompatUtils.java b/java/src/org/kelar/inputmethod/compat/CompatUtils.java
new file mode 100644
index 000000000..475685927
--- /dev/null
+++ b/java/src/org/kelar/inputmethod/compat/CompatUtils.java
@@ -0,0 +1,218 @@
+/*
+ * 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 org.kelar.inputmethod.compat;
+
+import android.text.TextUtils;
+import android.util.Log;
+
+import java.lang.reflect.Constructor;
+import java.lang.reflect.Field;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+
+public final class CompatUtils {
+    private static final String TAG = CompatUtils.class.getSimpleName();
+
+    private CompatUtils() {
+        // This utility class is not publicly instantiable.
+    }
+
+    public static Class<?> getClass(final String className) {
+        try {
+            return Class.forName(className);
+        } catch (final ClassNotFoundException e) {
+            return null;
+        }
+    }
+
+    public static Method getMethod(final Class<?> targetClass, final String name,
+            final Class<?>... parameterTypes) {
+        if (targetClass == null || TextUtils.isEmpty(name)) {
+            return null;
+        }
+        try {
+            return targetClass.getMethod(name, parameterTypes);
+        } catch (final SecurityException | NoSuchMethodException e) {
+            // ignore
+        }
+        return null;
+    }
+
+    public static Field getField(final Class<?> targetClass, final String name) {
+        if (targetClass == null || TextUtils.isEmpty(name)) {
+            return null;
+        }
+        try {
+            return targetClass.getField(name);
+        } catch (final SecurityException | NoSuchFieldException e) {
+            // ignore
+        }
+        return null;
+    }
+
+    public static Constructor<?> getConstructor(final Class<?> targetClass,
+            final Class<?> ... types) {
+        if (targetClass == null || types == null) {
+            return null;
+        }
+        try {
+            return targetClass.getConstructor(types);
+        } catch (final SecurityException | NoSuchMethodException e) {
+            // ignore
+        }
+        return null;
+    }
+
+    public static Object newInstance(final Constructor<?> constructor, final Object ... args) {
+        if (constructor == null) {
+            return null;
+        }
+        try {
+            return constructor.newInstance(args);
+        } catch (final InstantiationException | IllegalAccessException | IllegalArgumentException
+                | InvocationTargetException e) {
+            Log.e(TAG, "Exception in newInstance", e);
+        }
+        return null;
+    }
+
+    public static Object invoke(final Object receiver, final Object defaultValue,
+            final Method method, final Object... args) {
+        if (method == null) {
+            return defaultValue;
+        }
+        try {
+            return method.invoke(receiver, args);
+        } catch (final IllegalAccessException | IllegalArgumentException
+                | InvocationTargetException e) {
+            Log.e(TAG, "Exception in invoke", e);
+        }
+        return defaultValue;
+    }
+
+    public static Object getFieldValue(final Object receiver, final Object defaultValue,
+            final Field field) {
+        if (field == null) {
+            return defaultValue;
+        }
+        try {
+            return field.get(receiver);
+        } catch (final IllegalAccessException | IllegalArgumentException e) {
+            Log.e(TAG, "Exception in getFieldValue", e);
+        }
+        return defaultValue;
+    }
+
+    public static void setFieldValue(final Object receiver, final Field field, final Object value) {
+        if (field == null) {
+            return;
+        }
+        try {
+            field.set(receiver, value);
+        } catch (final IllegalAccessException | IllegalArgumentException e) {
+            Log.e(TAG, "Exception in setFieldValue", e);
+        }
+    }
+
+    public static ClassWrapper getClassWrapper(final String className) {
+        return new ClassWrapper(getClass(className));
+    }
+
+    public static final class ClassWrapper {
+        private final Class<?> mClass;
+        public ClassWrapper(final Class<?> targetClass) {
+            mClass = targetClass;
+        }
+
+        public boolean exists() {
+            return mClass != null;
+        }
+
+        public <T> ToObjectMethodWrapper<T> getMethod(final String name,
+                final T defaultValue, final Class<?>... parameterTypes) {
+            return new ToObjectMethodWrapper<>(CompatUtils.getMethod(mClass, name, parameterTypes),
+                    defaultValue);
+        }
+
+        public ToIntMethodWrapper getPrimitiveMethod(final String name, final int defaultValue,
+                final Class<?>... parameterTypes) {
+            return new ToIntMethodWrapper(CompatUtils.getMethod(mClass, name, parameterTypes),
+                    defaultValue);
+        }
+
+        public ToFloatMethodWrapper getPrimitiveMethod(final String name, final float defaultValue,
+                final Class<?>... parameterTypes) {
+            return new ToFloatMethodWrapper(CompatUtils.getMethod(mClass, name, parameterTypes),
+                    defaultValue);
+        }
+
+        public ToBooleanMethodWrapper getPrimitiveMethod(final String name,
+                final boolean defaultValue, final Class<?>... parameterTypes) {
+            return new ToBooleanMethodWrapper(CompatUtils.getMethod(mClass, name, parameterTypes),
+                    defaultValue);
+        }
+    }
+
+    public static final class ToObjectMethodWrapper<T> {
+        private final Method mMethod;
+        private final T mDefaultValue;
+        public ToObjectMethodWrapper(final Method method, final T defaultValue) {
+            mMethod = method;
+            mDefaultValue = defaultValue;
+        }
+        @SuppressWarnings("unchecked")
+        public T invoke(final Object receiver, final Object... args) {
+            return (T) CompatUtils.invoke(receiver, mDefaultValue, mMethod, args);
+        }
+    }
+
+    public static final class ToIntMethodWrapper {
+        private final Method mMethod;
+        private final int mDefaultValue;
+        public ToIntMethodWrapper(final Method method, final int defaultValue) {
+            mMethod = method;
+            mDefaultValue = defaultValue;
+        }
+        public int invoke(final Object receiver, final Object... args) {
+            return (int) CompatUtils.invoke(receiver, mDefaultValue, mMethod, args);
+        }
+    }
+
+    public static final class ToFloatMethodWrapper {
+        private final Method mMethod;
+        private final float mDefaultValue;
+        public ToFloatMethodWrapper(final Method method, final float defaultValue) {
+            mMethod = method;
+            mDefaultValue = defaultValue;
+        }
+        public float invoke(final Object receiver, final Object... args) {
+            return (float) CompatUtils.invoke(receiver, mDefaultValue, mMethod, args);
+        }
+    }
+
+    public static final class ToBooleanMethodWrapper {
+        private final Method mMethod;
+        private final boolean mDefaultValue;
+        public ToBooleanMethodWrapper(final Method method, final boolean defaultValue) {
+            mMethod = method;
+            mDefaultValue = defaultValue;
+        }
+        public boolean invoke(final Object receiver, final Object... args) {
+            return (boolean) CompatUtils.invoke(receiver, mDefaultValue, mMethod, args);
+        }
+    }
+}