1/*
2 * Copyright (C) 2008 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.tools.layoutlib.create;
18
19
20/**
21 * Interface to allow a method invocation to be listened upon.
22 * <p/>
23 * This is used by {@link OverrideMethod} to register a listener for methods that
24 * have been stubbed by the {@link AsmGenerator}. At runtime the stub will call either a
25 * default global listener or a specific listener based on the method signature.
26 */
27public interface MethodListener {
28    /**
29     * A stub method is being invoked.
30     * <p/>
31     * Known limitation: caller arguments are not available.
32     *
33     * @param signature The signature of the method being invoked, composed of the
34     *                  binary class name followed by the method descriptor (aka argument
35     *                  types). Example: "com/foo/MyClass/InnerClass/printInt(I)V".
36     * @param isNative True if the method was a native method.
37     * @param caller The calling object. Null for static methods, "this" for instance methods.
38     */
39    public void onInvokeV(String signature, boolean isNative, Object caller);
40
41    /**
42     * Same as {@link #onInvokeV(String, boolean, Object)} but returns an integer or similar.
43     * @see #onInvokeV(String, boolean, Object)
44     * @return an integer, or a boolean, or a short or a byte.
45     */
46    public int onInvokeI(String signature, boolean isNative, Object caller);
47
48    /**
49     * Same as {@link #onInvokeV(String, boolean, Object)} but returns a long.
50     * @see #onInvokeV(String, boolean, Object)
51     * @return a long.
52     */
53    public long onInvokeL(String signature, boolean isNative, Object caller);
54
55    /**
56     * Same as {@link #onInvokeV(String, boolean, Object)} but returns a float.
57     * @see #onInvokeV(String, boolean, Object)
58     * @return a float.
59     */
60    public float onInvokeF(String signature, boolean isNative, Object caller);
61
62    /**
63     * Same as {@link #onInvokeV(String, boolean, Object)} but returns a double.
64     * @see #onInvokeV(String, boolean, Object)
65     * @return a double.
66     */
67    public double onInvokeD(String signature, boolean isNative, Object caller);
68
69    /**
70     * Same as {@link #onInvokeV(String, boolean, Object)} but returns an object.
71     * @see #onInvokeV(String, boolean, Object)
72     * @return an object.
73     */
74    public Object onInvokeA(String signature, boolean isNative, Object caller);
75}
76
77