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/*
* Copyright (C) 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.os;
import java.io.IOException;
/**
* Wrapper class that offers to transport typical {@link Throwable} across a
* {@link Binder} call. This class is typically used to transport exceptions
* that cannot be modified to add {@link Parcelable} behavior, such as
* {@link IOException}.
* <ul>
* <li>The wrapped throwable must be defined as system class (that is, it must
* be in the same {@link ClassLoader} as {@link Parcelable}).
* <li>The wrapped throwable must support the
* {@link Throwable#Throwable(String)} constructor.
* <li>The receiver side must catch any thrown {@link ParcelableException} and
* call {@link #maybeRethrow(Class)} for all expected exception types.
* </ul>
*
* @hide
*/
public final class ParcelableException extends RuntimeException implements Parcelable {
public ParcelableException(Throwable t) {
super(t);
}
@SuppressWarnings("unchecked")
public <T extends Throwable> void maybeRethrow(Class<T> clazz) throws T {
if (clazz.isAssignableFrom(getCause().getClass())) {
throw (T) getCause();
}
}
/** {@hide} */
public static Throwable readFromParcel(Parcel in) {
final String name = in.readString();
final String msg = in.readString();
try {
final Class<?> clazz = Class.forName(name, true, Parcelable.class.getClassLoader());
if (Throwable.class.isAssignableFrom(clazz)) {
return (Throwable) clazz.getConstructor(String.class).newInstance(msg);
}
} catch (ReflectiveOperationException e) {
}
return new RuntimeException(name + ": " + msg);
}
/** {@hide} */
public static void writeToParcel(Parcel out, Throwable t) {
out.writeString(t.getClass().getName());
out.writeString(t.getMessage());
}
@Override
public int describeContents() {
return 0;
}
@Override
public void writeToParcel(Parcel dest, int flags) {
writeToParcel(dest, getCause());
}
public static final Creator<ParcelableException> CREATOR = new Creator<ParcelableException>() {
@Override
public ParcelableException createFromParcel(Parcel source) {
return new ParcelableException(readFromParcel(source));
}
@Override
public ParcelableException[] newArray(int size) {
return new ParcelableException[size];
}
};
}
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