com.facebook.buck.rules.keys.config.impl.BuckBinaryHashProvider.java Source code

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Here is the source code for com.facebook.buck.rules.keys.config.impl.BuckBinaryHashProvider.java

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/*
 * Copyright 2017-present Facebook, Inc.
 *
 * 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.facebook.buck.rules.keys.config.impl;

import com.google.common.base.Preconditions;

/** Provides the Buck binary hash key. */
public final class BuckBinaryHashProvider {
    private BuckBinaryHashProvider() {
    }

    private static String buckBinaryHash;

    /**
     * Returns Buck binary hash
     *
     * <p>The Buck binary hash key is generated during build time and reflects changes in Buck code
     * that can affect the content of build artifacts.
     */
    public static String getBuckBinaryHash() {
        if (buckBinaryHash == null) {
            buckBinaryHash = Preconditions.checkNotNull(System.getProperty("buck.binary_hash"));
        }
        return buckBinaryHash;
    }
}