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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.eclipse.aether.util.listener;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;
import org.eclipse.aether.transfer.AbstractTransferListener;
import org.eclipse.aether.transfer.TransferCancelledException;
import org.eclipse.aether.transfer.TransferEvent;
import org.eclipse.aether.transfer.TransferListener;
import static java.util.Objects.requireNonNull;
/**
* A transfer listener that delegates to zero or more other listeners (multicast). The list of target listeners is
* thread-safe, i.e. target listeners can be added or removed by any thread at any time.
*/
public final class ChainedTransferListener extends AbstractTransferListener {
private final List listeners = new CopyOnWriteArrayList<>();
/**
* Creates a new multicast listener that delegates to the specified listeners. In contrast to the constructor, this
* factory method will avoid creating an actual chained listener if one of the specified readers is actually
* {@code null}.
*
* @param listener1 The first listener, may be {@code null}.
* @param listener2 The second listener, may be {@code null}.
* @return The chained listener or {@code null} if no listener was supplied.
*/
public static TransferListener newInstance(TransferListener listener1, TransferListener listener2) {
if (listener1 == null) {
return listener2;
} else if (listener2 == null) {
return listener1;
}
return new ChainedTransferListener(listener1, listener2);
}
/**
* Creates a new multicast listener that delegates to the specified listeners.
*
* @param listeners The listeners to delegate to, may be {@code null} or empty.
*/
public ChainedTransferListener(TransferListener... listeners) {
if (listeners != null) {
add(Arrays.asList(listeners));
}
}
/**
* Creates a new multicast listener that delegates to the specified listeners.
*
* @param listeners The listeners to delegate to, may be {@code null} or empty.
*/
public ChainedTransferListener(Collection listeners) {
add(listeners);
}
/**
* Adds the specified listeners to the end of the multicast chain.
*
* @param listeners The listeners to add, may be {@code null} or empty.
*/
public void add(Collection listeners) {
if (listeners != null) {
for (TransferListener listener : listeners) {
add(listener);
}
}
}
/**
* Adds the specified listener to the end of the multicast chain.
*
* @param listener The listener to add, may be {@code null}.
*/
public void add(TransferListener listener) {
if (listener != null) {
listeners.add(listener);
}
}
/**
* Removes the specified listener from the multicast chain. Trying to remove a non-existing listener has no effect.
*
* @param listener The listener to remove, may be {@code null}.
*/
public void remove(TransferListener listener) {
if (listener != null) {
listeners.remove(listener);
}
}
@SuppressWarnings("EmptyMethod")
protected void handleError(TransferEvent event, TransferListener listener, RuntimeException error) {
// default just swallows errors
}
@Override
public void transferInitiated(TransferEvent event) throws TransferCancelledException {
requireNonNull(event, "event cannot be null");
for (TransferListener listener : listeners) {
try {
listener.transferInitiated(event);
} catch (RuntimeException e) {
handleError(event, listener, e);
}
}
}
@Override
public void transferStarted(TransferEvent event) throws TransferCancelledException {
requireNonNull(event, "event cannot be null");
for (TransferListener listener : listeners) {
try {
listener.transferStarted(event);
} catch (RuntimeException e) {
handleError(event, listener, e);
}
}
}
@Override
public void transferProgressed(TransferEvent event) throws TransferCancelledException {
requireNonNull(event, "event cannot be null");
for (TransferListener listener : listeners) {
try {
listener.transferProgressed(event);
} catch (RuntimeException e) {
handleError(event, listener, e);
}
}
}
@Override
public void transferCorrupted(TransferEvent event) throws TransferCancelledException {
requireNonNull(event, "event cannot be null");
for (TransferListener listener : listeners) {
try {
listener.transferCorrupted(event);
} catch (RuntimeException e) {
handleError(event, listener, e);
}
}
}
@Override
public void transferSucceeded(TransferEvent event) {
requireNonNull(event, "event cannot be null");
for (TransferListener listener : listeners) {
try {
listener.transferSucceeded(event);
} catch (RuntimeException e) {
handleError(event, listener, e);
}
}
}
@Override
public void transferFailed(TransferEvent event) {
requireNonNull(event, "event cannot be null");
for (TransferListener listener : listeners) {
try {
listener.transferFailed(event);
} catch (RuntimeException e) {
handleError(event, listener, e);
}
}
}
}