92 lines
3.2 KiB
Java
92 lines
3.2 KiB
Java
/*
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* Copyright (C) 2011 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 android.system;
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import java.io.IOException;
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import java.net.SocketException;
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import libcore.io.Libcore;
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import libcore.util.NonNull;
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/**
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* A checked exception thrown when {@link Os} methods fail. This exception contains the native
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* errno value, for comparison against the constants in {@link OsConstants}, should sophisticated
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* callers need to adjust their behavior based on the exact failure.
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*/
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public final class ErrnoException extends Exception {
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private final String functionName;
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/**
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* The errno value, for comparison with the {@code E} constants in {@link OsConstants}.
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*/
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public final int errno;
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/**
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* Constructs an instance with the given function name and errno value.
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*/
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public ErrnoException(String functionName, int errno) {
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this.functionName = functionName;
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this.errno = errno;
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}
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/**
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* Constructs an instance with the given function name, errno value, and cause.
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*/
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public ErrnoException(String functionName, int errno, Throwable cause) {
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super(cause);
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this.functionName = functionName;
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this.errno = errno;
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}
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/**
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* Converts the stashed function name and errno value to a human-readable string.
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* We do this here rather than in the constructor so that callers only pay for
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* this if they need it.
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*/
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@Override public String getMessage() {
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String errnoName = OsConstants.errnoName(errno);
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if (errnoName == null) {
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errnoName = "errno " + errno;
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}
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String description = Libcore.os.strerror(errno);
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return functionName + " failed: " + errnoName + " (" + description + ")";
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}
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/**
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* Throws an {@link IOException} with a message based on {@link #getMessage()} and with this
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* instance as the cause.
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*
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* <p>This method always terminates by throwing the exception. Callers can write
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* {@code throw e.rethrowAsIOException()} to make that clear to the compiler.
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*/
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public @NonNull IOException rethrowAsIOException() throws IOException {
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IOException newException = new IOException(getMessage());
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newException.initCause(this);
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throw newException;
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}
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/**
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* Throws a {@link SocketException} with a message based on {@link #getMessage()} and with this
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* instance as the cause.
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*
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* <p>This method always terminates by throwing the exception. Callers can write
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* {@code throw e.rethrowAsIOException()} to make that clear to the compiler.
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*/
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public @NonNull SocketException rethrowAsSocketException() throws SocketException {
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throw new SocketException(getMessage(), this);
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}
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}
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