90 lines
3.1 KiB
Java
90 lines
3.1 KiB
Java
/*
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* Copyright (C) 2020 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.internal.os;
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import android.os.Binder;
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import com.android.internal.annotations.VisibleForTesting;
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import java.lang.reflect.InvocationTargetException;
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import java.lang.reflect.Method;
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import java.lang.reflect.Modifier;
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import java.util.HashMap;
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/**
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* Maps a binder class and transaction code to the default transaction name. Since this
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* resolution is class-based as opposed to instance-based, any custom implementation of
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* {@link Binder#getTransactionName} will be ignored.
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*
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* The class is NOT thread safe
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*
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* @hide
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*/
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@VisibleForTesting(visibility = VisibleForTesting.Visibility.PACKAGE)
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public class BinderTransactionNameResolver {
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private static final Method NO_GET_DEFAULT_TRANSACTION_NAME_METHOD;
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/**
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* Generates the default transaction method name, which is just the transaction code.
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* Used when the binder does not define a static "getDefaultTransactionName" method.
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*
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* @hide
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*/
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public static String noDefaultTransactionName(int transactionCode) {
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return String.valueOf(transactionCode);
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}
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static {
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try {
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NO_GET_DEFAULT_TRANSACTION_NAME_METHOD = BinderTransactionNameResolver.class.getMethod(
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"noDefaultTransactionName", int.class);
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} catch (NoSuchMethodException e) {
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throw new RuntimeException(e);
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}
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}
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private final HashMap<Class<? extends Binder>, Method>
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mGetDefaultTransactionNameMethods = new HashMap<>();
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/**
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* Given a binder class name and transaction code, returns the corresponding method name.
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*
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* @hide
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*/
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public String getMethodName(Class<? extends Binder> binderClass, int transactionCode) {
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Method method = mGetDefaultTransactionNameMethods.get(binderClass);
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if (method == null) {
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try {
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method = binderClass.getMethod("getDefaultTransactionName", int.class);
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} catch (NoSuchMethodException e) {
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method = NO_GET_DEFAULT_TRANSACTION_NAME_METHOD;
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}
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if (method.getReturnType() != String.class
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|| !Modifier.isStatic(method.getModifiers())) {
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method = NO_GET_DEFAULT_TRANSACTION_NAME_METHOD;
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}
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mGetDefaultTransactionNameMethods.put(binderClass, method);
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}
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try {
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return (String) method.invoke(null, transactionCode);
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} catch (IllegalAccessException | InvocationTargetException e) {
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throw new RuntimeException(e);
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}
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}
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}
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