DO NOT SUBMIT: add main dex list check to classloader.

build/android/incremental_install/java/org/chromium/incrementalinstall/Reflect.java

-// Copyright 2015 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-package org.chromium.incrementalinstall;
-
-import java.lang.reflect.Array;
-import java.lang.reflect.Constructor;
-import java.lang.reflect.Field;
-import java.lang.reflect.Method;
-import java.util.Arrays;
-
-/**
- * Reflection helper methods.
- */
-final class Reflect {
-    /**
-     * Sets the value of an object's field (even if it's not visible).
-     *
-     * @param instance The object containing the field to set.
-     * @param name The name of the field to set.
-     * @param value The new value for the field.
-     */
-    static void setField(Object instance, String name, Object value)
-            throws ReflectiveOperationException {
-        Field field = findField(instance, name);
-        field.setAccessible(true);
-        field.set(instance, value);
-    }
-
-    /**
-     * Retrieves the value of an object's field (even if it's not visible).
-     *
-     * @param instance The object containing the field to set.
-     * @param name The name of the field to set.
-     * @return The field's value. Primitive values are returned as their boxed
-     *         type.
-     */
-    static Object getField(Object instance, String name) throws ReflectiveOperationException {
-        Field field = findField(instance, name);
-        field.setAccessible(true);
-        return field.get(instance);
-    }
-
-    /**
-     * Concatenates two arrays into a new array. The arrays must be of the same
-     * type.
-     */
-    static Object[] concatArrays(Object[] arrType, Object[] left, Object[] right) {
-        Object[] result = (Object[]) Array.newInstance(
-                arrType.getClass().getComponentType(), left.length + right.length);
-        System.arraycopy(left, 0, result, 0, left.length);
-        System.arraycopy(right, 0, result, left.length, right.length);
-        return result;
-    }
-
-    /**
-     * Invokes a method with zero or more parameters. For static methods, use the Class as the
-     * instance.
-     */
-    static Object invokeMethod(Object instance, String name, Object... params)
-            throws ReflectiveOperationException {
-        boolean isStatic = instance instanceof Class;
-        Class<?> clazz = isStatic ? (Class<?>) instance :  instance.getClass();
-        Method method = findMethod(clazz, name, params);
-        method.setAccessible(true);
-        return method.invoke(instance, params);
-    }
-
-    /**
-     * Calls a constructor with zero or more parameters.
-     */
-    static Object newInstance(Class<?> clazz, Object... params)
-            throws ReflectiveOperationException {
-        Constructor<?> constructor = findConstructor(clazz, params);
-        constructor.setAccessible(true);
-        return constructor.newInstance(params);
-    }
-
-    private static Field findField(Object instance, String name) throws NoSuchFieldException {
-        boolean isStatic = instance instanceof Class;
-        Class<?> clazz = isStatic ? (Class<?>) instance :  instance.getClass();
-        for (; clazz != null; clazz = clazz.getSuperclass()) {
-            try {
-                return clazz.getDeclaredField(name);
-            } catch (NoSuchFieldException e) {
-                // Need to look in the super class.
-            }
-        }
-        throw new NoSuchFieldException("Field " + name + " not found in " + instance.getClass());
-    }
-
-    private static Method findMethod(Class<?> clazz, String name, Object... params)
-            throws NoSuchMethodException {
-        for (; clazz != null; clazz = clazz.getSuperclass()) {
-            for (Method method : clazz.getDeclaredMethods()) {
-                if (method.getName().equals(name)
-                        && areParametersCompatible(method.getParameterTypes(), params)) {
-                    return method;
-                }
-            }
-        }
-        throw new NoSuchMethodException("Method " + name + " with parameters "
-                + Arrays.asList(params) + " not found in " + clazz);
-    }
-
-    private static Constructor<?> findConstructor(Class<?> clazz, Object... params)
-            throws NoSuchMethodException {
-        for (Constructor<?> constructor : clazz.getDeclaredConstructors()) {
-            if (areParametersCompatible(constructor.getParameterTypes(), params)) {
-                return constructor;
-            }
-        }
-        throw new NoSuchMethodException("Constructor with parameters " + Arrays.asList(params)
-                + " not found in " + clazz);
-    }
-
-    private static boolean areParametersCompatible(Class<?>[] paramTypes, Object... params) {
-        if (params.length != paramTypes.length) {
-            return false;
-        }
-        for (int i = 0; i < params.length; i++) {
-            if (!isAssignableFrom(paramTypes[i], params[i])) {
-                return false;
-            }
-        }
-        return true;
-    }
-
-    private static boolean isAssignableFrom(Class<?> left, Object right) {
-        if (right == null) {
-            return !left.isPrimitive();
-        }
-        Class<?> rightClazz = right.getClass();
-        if (left.isPrimitive()) {
-            // TODO(agrieve): Fill in the rest as needed.
-            return left == boolean.class && rightClazz == Boolean.class
-                   || left == int.class && rightClazz == Integer.class;
-        }
-        return left.isAssignableFrom(rightClazz);
-    }
-}