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// Copyright 2014 Google Inc. 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.skyframe;
import com.google.common.base.Predicate;
import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;
import java.io.Serializable;
import java.util.Set;
import java.util.concurrent.ExecutionException;
/** An identifier for a {@code SkyFunction}. */
public final class SkyFunctionName implements Serializable {
// In practice the number of unique SkyFunctionNames should be reasonably limited, use this cache
// to avoid accidentally creating many of the same.
private static final LoadingCache<String, SkyFunctionName> skyFunctionNameCache =
CacheBuilder.newBuilder()
.weakValues()
.build(
new CacheLoader<String, SkyFunctionName>() {
@Override
public SkyFunctionName load(String name) {
return new SkyFunctionName(name);
}
});
/** Create a SkyFunctionName identified by {@code name}. */
public static SkyFunctionName create(String name) {
try {
return skyFunctionNameCache.get(name);
} catch (ExecutionException e) {
throw new IllegalStateException("Unexpected exception creating SkyFunctionName", e);
}
}
private final String name;
private SkyFunctionName(String name) {
this.name = name;
}
public String getName() {
return name;
}
@Override
public String toString() {
return name;
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (!(obj instanceof SkyFunctionName)) {
return false;
}
SkyFunctionName other = (SkyFunctionName) obj;
return name.equals(other.name);
}
@Override
public int hashCode() {
return name.hashCode();
}
/**
* A predicate that returns true for {@link SkyKey}s that have the given {@link SkyFunctionName}.
*/
public static Predicate<SkyKey> functionIs(final SkyFunctionName functionName) {
return new Predicate<SkyKey>() {
@Override
public boolean apply(SkyKey skyKey) {
return functionName.equals(skyKey.functionName());
}
};
}
/**
* A predicate that returns true for {@link SkyKey}s that have the given {@link SkyFunctionName}.
*/
public static Predicate<SkyKey> functionIsIn(final Set<SkyFunctionName> functionNames) {
return new Predicate<SkyKey>() {
@Override
public boolean apply(SkyKey skyKey) {
return functionNames.contains(skyKey.functionName());
}
};
}
}
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