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// Copyright 2014 The Bazel Authors. All rights reserved.
//
// 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 com.google.devtools.build.lib.events;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Iterables;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.Set;
/**
* An {@link EventHandler} that collects all events it encounters, and makes them available via the
* {@link Iterable} interface. The collected events contain not just the original event information
* but also the location context.
*/
public final class EventCollector extends AbstractEventHandler implements Iterable<Event> {
private final Collection<Event> collected;
/**
* This collector will collect all events that match the event mask.
*/
public EventCollector(Set<EventKind> mask) {
this(mask, new ArrayList<Event>());
}
/**
* This collector will collect all events.
*/
public EventCollector() {
this(EventKind.ALL_EVENTS, new ArrayList<Event>());
}
/**
* This collector will collect all events that match the event mask.
*/
public EventCollector(EventKind... mask) {
this(ImmutableSet.copyOf(mask), new ArrayList<Event>());
}
/**
* This collector will save the Event instances in the provided
* collection.
*/
public EventCollector(Set<EventKind> mask, Collection<Event> collected) {
super(mask);
this.collected = collected;
}
/**
* Implements {@link EventHandler#handle(Event)}.
*/
@Override
public synchronized void handle(Event event) {
if (getEventMask().contains(event.getKind())) {
collected.add(event);
}
if (event.getStdErr() != null) {
handle(Event.of(EventKind.STDERR, null, event.getStdErr()));
}
if (event.getStdOut() != null) {
handle(Event.of(EventKind.STDOUT, null, event.getStdOut()));
}
}
/**
* Returns an iterator over the collected events. This must not be called in a scenario where
* there may still be concurrent modifications to the collector.
*/
@Override
public Iterator<Event> iterator() {
return collected.iterator();
}
/**
* Returns an iterator over the collected events of the given kind. This must not be called in a
* scenario where there may still be concurrent modifications to the collector.
*/
public Iterable<Event> filtered(final EventKind eventKind) {
return Iterables.filter(collected, event -> event.getKind() == eventKind);
}
/**
* Returns the number of events collected.
*/
public synchronized int count() {
return collected.size();
}
/*
* Clears the collected events
*/
public synchronized void clear() {
collected.clear();
}
@Override
public synchronized String toString() {
return "EventCollector: " + Iterables.toString(collected);
}
}
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