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Side by Side Diff: webapk/shell_apk/src/org/chromium/webapk/shell_apk/Reflect.java

Issue 1965583002: Move //webapk to //chrome/android/webapk (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Created 4 years, 7 months ago
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1 // Copyright 2016 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 package org.chromium.webapk.shell_apk;
6
7 import java.lang.reflect.Array;
8 import java.lang.reflect.Field;
9
10 /**
11 * Reflection helper methods.
12 */
13 final class Reflect {
14 /**
15 * Sets the value of an object's field (even if it's not visible).
16 *
17 * @param instance The object containing the field to set.
18 * @param name The name of the field to set.
19 * @param value The new value for the field.
20 */
21 static void setField(Object instance, String name, Object value)
22 throws ReflectiveOperationException {
23 Field field = findField(instance, name);
24 field.setAccessible(true);
25 field.set(instance, value);
26 }
27
28 /**
29 * Retrieves the value of an object's field (even if it's not visible).
30 *
31 * @param instance The object containing the field to set.
32 * @param name The name of the field to set.
33 * @return The field's value. Primitive values are returned as their boxed
34 * type.
35 */
36 static Object getField(Object instance, String name) throws ReflectiveOperat ionException {
37 Field field = findField(instance, name);
38 field.setAccessible(true);
39 return field.get(instance);
40 }
41
42 /**
43 * Concatenates two arrays into a new array. The arrays must be of the same
44 * type.
45 */
46 static Object[] concatArrays(Object[] left, Object[] right) {
47 Object[] result = (Object[]) Array.newInstance(
48 left.getClass().getComponentType(), left.length + right.length);
49 System.arraycopy(left, 0, result, 0, left.length);
50 System.arraycopy(right, 0, result, left.length, right.length);
51 return result;
52 }
53
54 private static Field findField(Object instance, String name) throws NoSuchFi eldException {
55 boolean isStatic = instance instanceof Class;
56 Class<?> clazz = isStatic ? (Class<?>) instance : instance.getClass();
57 for (; clazz != null; clazz = clazz.getSuperclass()) {
58 try {
59 return clazz.getDeclaredField(name);
60 } catch (NoSuchFieldException e) {
61 // Need to look in the super class.
62 }
63 }
64 throw new NoSuchFieldException("Field " + name + " not found in " + inst ance.getClass());
65 }
66 }
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