android/support/transition/ViewUtilsApi21.java

/*
 * Copyright (C) 2017 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.support.transition;

import android.graphics.Matrix;
import android.support.annotation.NonNull;
import android.support.annotation.RequiresApi;
import android.util.Log;
import android.view.View;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

@RequiresApi(21)
class ViewUtilsApi21 extends ViewUtilsApi19 {

    private static final String TAG = "ViewUtilsApi21";

    private static Method sTransformMatrixToGlobalMethod;
    private static boolean sTransformMatrixToGlobalMethodFetched;
    private static Method sTransformMatrixToLocalMethod;
    private static boolean sTransformMatrixToLocalMethodFetched;
    private static Method sSetAnimationMatrixMethod;
    private static boolean sSetAnimationMatrixMethodFetched;

    @Override
    public void transformMatrixToGlobal(@NonNull View view, @NonNull Matrix matrix) {
        fetchTransformMatrixToGlobalMethod();
        if (sTransformMatrixToGlobalMethod != null) {
            try {
                sTransformMatrixToGlobalMethod.invoke(view, matrix);
            } catch (IllegalAccessException e) {
                // Do nothing
            } catch (InvocationTargetException e) {
                throw new RuntimeException(e.getCause());
            }
        }
    }

    @Override
    public void transformMatrixToLocal(@NonNull View view, @NonNull Matrix matrix) {
        fetchTransformMatrixToLocalMethod();
        if (sTransformMatrixToLocalMethod != null) {
            try {
                sTransformMatrixToLocalMethod.invoke(view, matrix);
            } catch (IllegalAccessException e) {
                // Do nothing
            } catch (InvocationTargetException e) {
                throw new RuntimeException(e.getCause());
            }
        }
    }

    @Override
    public void setAnimationMatrix(@NonNull View view, Matrix matrix) {
        fetchSetAnimationMatrix();
        if (sSetAnimationMatrixMethod != null) {
            try {
                sSetAnimationMatrixMethod.invoke(view, matrix);
            } catch (InvocationTargetException e) {
                // Do nothing
            } catch (IllegalAccessException e) {
                throw new RuntimeException(e.getCause());
            }
        }
    }

    private void fetchTransformMatrixToGlobalMethod() {
        if (!sTransformMatrixToGlobalMethodFetched) {
            try {
                sTransformMatrixToGlobalMethod = View.class.getDeclaredMethod(
                        "transformMatrixToGlobal", Matrix.class);
                sTransformMatrixToGlobalMethod.setAccessible(true);
            } catch (NoSuchMethodException e) {
                Log.i(TAG, "Failed to retrieve transformMatrixToGlobal method", e);
            }
            sTransformMatrixToGlobalMethodFetched = true;
        }
    }

    private void fetchTransformMatrixToLocalMethod() {
        if (!sTransformMatrixToLocalMethodFetched) {
            try {
                sTransformMatrixToLocalMethod = View.class.getDeclaredMethod(
                        "transformMatrixToLocal", Matrix.class);
                sTransformMatrixToLocalMethod.setAccessible(true);
            } catch (NoSuchMethodException e) {
                Log.i(TAG, "Failed to retrieve transformMatrixToLocal method", e);
            }
            sTransformMatrixToLocalMethodFetched = true;
        }
    }

    private void fetchSetAnimationMatrix() {
        if (!sSetAnimationMatrixMethodFetched) {
            try {
                sSetAnimationMatrixMethod = View.class.getDeclaredMethod(
                        "setAnimationMatrix", Matrix.class);
                sSetAnimationMatrixMethod.setAccessible(true);
            } catch (NoSuchMethodException e) {
                Log.i(TAG, "Failed to retrieve setAnimationMatrix method", e);
            }
            sSetAnimationMatrixMethodFetched = true;
        }
    }

}