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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.rules.objc;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableList;
/**
* Represents a type whose equality, hash code, and string representation are defined by a single
* immutable array. This class is designed to be extended by a final class, and to pass the member
* data to this class's constructor.
*
* @param <V> the base class that extends {@code Value}
*/
// TODO(bazel-team): Replace with AutoValue once that is supported in bazel.
public class Value<V extends Value<V>> {
private final Object memberData;
/**
* Constructs a new instance with the given member data. Generally, all member data should be
* reflected in final fields in the child class.
* @throws NullPointerException if any element in {@code memberData} is null
*/
public Value(Object... memberData) {
Preconditions.checkArgument(memberData.length > 0);
this.memberData = (memberData.length == 1)
? Preconditions.checkNotNull(memberData[0]) : ImmutableList.copyOf(memberData);
}
/**
* A type-safe alternative to calling {@code a.equals(b)}. When using {@code a.equals(b)},
* {@code b} may accidentally be a different class from {@code a}, in which case there will be no
* compiler warning and the result will always be false. This method requires both values to have
* compatible types and to be non-null.
*/
public boolean equalsOther(V other) {
return equals(Preconditions.checkNotNull(other));
}
@Override
public boolean equals(Object o) {
if ((o == null) || (o.getClass() != getClass())) {
return false;
}
Value<?> other = (Value<?>) o;
return memberData.equals(other.memberData);
}
@Override
public int hashCode() {
return memberData.hashCode();
}
@Override
public String toString() {
return getClass().getSimpleName() + ":" + memberData.toString();
}
}
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