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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.skyframe;
import com.google.common.collect.Interner;
import com.google.devtools.build.lib.concurrent.BlazeInterners;
/** Versioning scheme based on integers. */
final class IntVersion implements Version {
private static final Interner<IntVersion> interner = BlazeInterners.newWeakInterner();
private final long val;
private IntVersion(long val) {
this.val = val;
}
long getVal() {
return val;
}
IntVersion next() {
return of(val + 1);
}
static IntVersion of(long val) {
return interner.intern(new IntVersion(val));
}
@Override
public boolean atMost(Version other) {
if (!(other instanceof IntVersion)) {
return false;
}
return val <= ((IntVersion) other).val;
}
@Override
public int hashCode() {
return Long.valueOf(val).hashCode();
}
@Override
public boolean equals(Object obj) {
if (obj instanceof IntVersion) {
IntVersion other = (IntVersion) obj;
return other.val == val;
}
return false;
}
@Override
public String toString() {
return "IntVersion: " + val;
}
}
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