com.facebook.buck.rules.keys.UncachedRuleKeyBuilder.java Source code

Introduction

Here is the source code for com.facebook.buck.rules.keys.UncachedRuleKeyBuilder.java

Source

/*
 * Copyright 2016-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;

import com.facebook.buck.rules.BuildRule;
import com.facebook.buck.rules.BuildTargetSourcePath;
import com.facebook.buck.rules.RuleKey;
import com.facebook.buck.rules.RuleKeyAppendable;
import com.facebook.buck.rules.SourcePath;
import com.facebook.buck.rules.SourcePathResolver;
import com.facebook.buck.rules.SourcePathRuleFinder;
import com.facebook.buck.util.cache.FileHashCache;
import com.google.common.base.Supplier;
import com.google.common.hash.HashCode;
import com.google.common.hash.Hashing;

import java.io.IOException;

public class UncachedRuleKeyBuilder extends RuleKeyBuilder<RuleKey> {

    private final RuleKeyFactory<RuleKey> ruleKeyFactory;
    private final Supplier<UncachedRuleKeyBuilder> subKeySupplier;

    public UncachedRuleKeyBuilder(SourcePathRuleFinder ruleFinder, SourcePathResolver resolver,
            FileHashCache hashCache, RuleKeyFactory<RuleKey> ruleKeyFactory) {
        this(ruleFinder, resolver, hashCache, createHasher(), ruleKeyFactory);
    }

    public UncachedRuleKeyBuilder(SourcePathRuleFinder ruleFinder, SourcePathResolver resolver,
            FileHashCache hashCache, RuleKeyHasher<HashCode> hasher, RuleKeyFactory<RuleKey> ruleKeyFactory) {
        super(ruleFinder, resolver, hashCache, hasher);
        this.ruleKeyFactory = ruleKeyFactory;
        this.subKeySupplier = createSubKeySupplier(ruleFinder, resolver, hashCache, ruleKeyFactory);
    }

    private static RuleKeyHasher<HashCode> createHasher() {
        return new GuavaRuleKeyHasher(Hashing.sha1().newHasher());
    }

    private static Supplier<UncachedRuleKeyBuilder> createSubKeySupplier(SourcePathRuleFinder ruleFinder,
            final SourcePathResolver resolver, final FileHashCache hashCache,
            final RuleKeyFactory<RuleKey> ruleKeyFactory) {
        return () -> new UncachedRuleKeyBuilder(ruleFinder, resolver, hashCache, ruleKeyFactory);
    }

    @Override
    protected UncachedRuleKeyBuilder setBuildRule(BuildRule rule) {
        setBuildRuleKey(ruleKeyFactory.build(rule));
        return this;
    }

    @Override
    protected UncachedRuleKeyBuilder setAppendableRuleKey(RuleKeyAppendable appendable) {
        RuleKeyBuilder<RuleKey> subKeyBuilder = subKeySupplier.get();
        appendable.appendToRuleKey(subKeyBuilder);
        RuleKey subKey = subKeyBuilder.build();
        setAppendableRuleKey(subKey);
        return this;
    }

    @Override
    protected RuleKeyBuilder<RuleKey> setSourcePath(SourcePath sourcePath) throws IOException {
        if (sourcePath instanceof BuildTargetSourcePath) {
            return setSourcePathAsRule((BuildTargetSourcePath) sourcePath);
        } else {
            return setSourcePathDirectly(sourcePath);
        }
    }

    @Override
    public RuleKey build() {
        return buildRuleKey();
    }

}