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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.packages;
import com.google.common.base.Preconditions;
import java.util.Objects;
import javax.annotation.Nullable;
/**
* A wrapper around Skylark provider identifier, representing either a declared provider ({@see
* SkylarkProvider}) or a "legacy" string identifier.
*/
public final class SkylarkProviderIdentifier {
@Nullable
private final String legacyId;
@Nullable private final Provider.Key key;
/** Creates an id for a declared provider with a given key ({@see SkylarkProvider}). */
public static SkylarkProviderIdentifier forKey(Provider.Key key) {
return new SkylarkProviderIdentifier(key);
}
/**
* Creates an id for a provider with a given name.
*/
public static SkylarkProviderIdentifier forLegacy(String legacyId) {
return new SkylarkProviderIdentifier(legacyId);
}
private SkylarkProviderIdentifier(String legacyId) {
this.legacyId = legacyId;
this.key = null;
}
private SkylarkProviderIdentifier(Provider.Key key) {
this.legacyId = null;
this.key = key;
}
/**
* Returns true if this {@link SkylarkProviderIdentifier} identifies
* a legacy provider (with a string name).
*/
public boolean isLegacy() {
return legacyId != null;
}
/**
* Returns a string identifying the provider (only for legacy providers).
*/
public String getLegacyId() {
Preconditions.checkState(isLegacy(), "Check isLegacy() first");
return legacyId;
}
/** Returns a key identifying the declared provider (only for non-legacy providers). */
public Provider.Key getKey() {
Preconditions.checkState(!isLegacy(), "Check !isLegacy() first");
return key;
}
@Override
public String toString() {
if (isLegacy()) {
return legacyId;
}
return key.toString();
}
@Override
public int hashCode() {
return legacyId != null ? legacyId.hashCode() * 2 : key.hashCode();
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (!(obj instanceof SkylarkProviderIdentifier)) {
return false;
}
SkylarkProviderIdentifier other = (SkylarkProviderIdentifier) obj;
return Objects.equals(legacyId, other.legacyId)
&& Objects.equals(key, other.key);
}
}
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