Support Crazy Linker in WebAPK to load Chrome's uncompressed native libraries.

web_apks/minting_example/src/org/chromium/minting/Reflect.java

+// Copyright 2016 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.minting;
+
+import java.lang.reflect.Array;
+import java.lang.reflect.Field;
+
+/**
+* Reflection helper methods.
+*/
+final class Reflect {

[Yaron, 2016/02/19 22:10:20]

Is this a straight copy?

[Xi Han, 2016/02/24 19:09:38]

Yes:)

+  /**
+    * 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[] left, Object[] right) {
+        Object[] result = (Object[]) Array.newInstance(
+                left.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;
+    }
+
+    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());
+    }
+}