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// Copyright 2015 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.analysis.constraints;
import com.google.common.collect.ImmutableCollection;
import com.google.common.collect.ImmutableMultimap;
import com.google.common.collect.ImmutableSet;
import com.google.devtools.build.lib.cmdline.Label;
import com.google.devtools.build.lib.concurrent.ThreadSafety.Immutable;
import com.google.devtools.build.lib.packages.EnvironmentGroup;
import java.util.Map;
/**
* Contains a set of {@link Environment} labels and their associated groups.
*/
@Immutable
public class EnvironmentCollection {
private final ImmutableMultimap<EnvironmentGroup, Label> map;
private EnvironmentCollection(ImmutableMultimap<EnvironmentGroup, Label> map) {
this.map = map;
}
/**
* Stores an environment's build label along with the group it belongs to.
*/
static class EnvironmentWithGroup {
private final Label environment;
private final EnvironmentGroup group;
EnvironmentWithGroup(Label environment, EnvironmentGroup group) {
this.environment = environment;
this.group = group;
}
Label environment() { return environment; }
EnvironmentGroup group() { return group; }
}
/**
* Returns the build labels of each environment in this collection, ordered by
* their insertion order in {@link Builder}.
*/
ImmutableCollection<Label> getEnvironments() {
return map.values();
}
/**
* Returns the set of groups the environments in this collection belong to, ordered by
* their insertion order in {@link Builder}
*/
ImmutableSet<EnvironmentGroup> getGroups() {
return map.keySet();
}
/**
* Returns the build labels of each environment in this collection paired with the
* group each environment belongs to, ordered by their insertion order in {@link Builder}.
*/
ImmutableCollection<EnvironmentWithGroup> getGroupedEnvironments() {
ImmutableSet.Builder<EnvironmentWithGroup> builder = ImmutableSet.builder();
for (Map.Entry<EnvironmentGroup, Label> entry : map.entries()) {
builder.add(new EnvironmentWithGroup(entry.getValue(), entry.getKey()));
}
return builder.build();
}
/**
* Returns the environments in this collection that belong to the given group, ordered by
* their insertion order in {@link Builder}. If no environments belong to the given group,
* returns an empty collection.
*/
ImmutableCollection<Label> getEnvironments(EnvironmentGroup group) {
return map.get(group);
}
/**
* An empty collection.
*/
static final EnvironmentCollection EMPTY =
new EnvironmentCollection(ImmutableMultimap.<EnvironmentGroup, Label>of());
/**
* Builder for {@link EnvironmentCollection}.
*/
public static class Builder {
private final ImmutableMultimap.Builder<EnvironmentGroup, Label> mapBuilder =
ImmutableMultimap.builder();
/**
* Inserts the given environment / owning group pair.
*/
public Builder put(EnvironmentGroup group, Label environment) {
mapBuilder.put(group, environment);
return this;
}
/**
* Inserts the given set of environments, all belonging to the specified group.
*/
public Builder putAll(EnvironmentGroup group, Iterable<Label> environments) {
mapBuilder.putAll(group, environments);
return this;
}
/**
* Inserts the contents of another {@link EnvironmentCollection} into this one.
*/
public Builder putAll(EnvironmentCollection other) {
mapBuilder.putAll(other.map);
return this;
}
public EnvironmentCollection build() {
return new EnvironmentCollection(mapBuilder.build());
}
}
}
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