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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.analysis;
import com.google.common.collect.ImmutableCollection;
import com.google.common.collect.ImmutableMap;
import com.google.devtools.build.lib.concurrent.ThreadSafety.Immutable;
import com.google.devtools.build.lib.syntax.EvalException;
import com.google.devtools.build.lib.syntax.SkylarkType;
import com.google.devtools.build.lib.util.Preconditions;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
/**
* A helper class for transitive infos provided by Skylark rule implementations.
*/
@Immutable
public final class SkylarkProviders implements TransitiveInfoProvider {
private final ImmutableMap<String, Object> skylarkProviders;
SkylarkProviders(ImmutableMap<String, Object> skylarkProviders) {
Preconditions.checkNotNull(skylarkProviders);
this.skylarkProviders = skylarkProviders;
}
/**
* Returns the keys for the Skylark providers.
*/
public ImmutableCollection<String> getKeys() {
return skylarkProviders.keySet();
}
/**
* Returns a Skylark provider; "key" must be one from {@link #getKeys()}.
*/
public Object getValue(String key) {
return skylarkProviders.get(key);
}
/**
* Returns a Skylark provider and try to cast it into the specified type
*/
public <TYPE> TYPE getValue(String key, Class<TYPE> type) throws EvalException {
Object obj = skylarkProviders.get(key);
if (obj == null) {
return null;
}
SkylarkType.checkType(obj, type, key);
return type.cast(obj);
}
/**
* Merges skylark providers. The set of providers must be disjoint.
*
* @param providers providers to merge {@code this} with.
*/
public static SkylarkProviders merge(List<SkylarkProviders> providers) {
if (providers.size() == 0) {
return null;
}
if (providers.size() == 1) {
return providers.get(0);
}
ImmutableMap.Builder<String, Object> resultBuilder = new ImmutableMap.Builder<>();
Set<String> seenKeys = new HashSet<>();
for (SkylarkProviders provider : providers) {
for (String key : provider.skylarkProviders.keySet()) {
if (!seenKeys.add(key)) {
// TODO(dslomov): add better diagnostics.
throw new IllegalStateException("Skylark provider " + key + " provided twice");
}
resultBuilder.put(key, provider.getValue(key));
}
}
return new SkylarkProviders(resultBuilder.build());
}
}
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