com.facebook.buck.java.JavaLibraryRules.java Source code

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Here is the source code for com.facebook.buck.java.JavaLibraryRules.java

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/*
 * Copyright 2013-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.java;

import com.facebook.buck.model.BuildTarget;
import com.facebook.buck.model.BuildTargets;
import com.facebook.buck.rules.AbiRule;
import com.facebook.buck.rules.BuildableContext;
import com.facebook.buck.rules.OnDiskBuildInfo;
import com.facebook.buck.rules.Sha1HashCode;
import com.facebook.buck.step.Step;
import com.facebook.buck.step.fs.MkdirStep;
import com.google.common.base.Optional;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSortedMap;
import com.google.common.hash.HashCode;

import java.io.IOException;
import java.nio.file.Path;
import java.util.List;

/**
 * Common utilities for working with {@link JavaLibrary} objects.
 */
public class JavaLibraryRules {

    /** Utility class: do not instantiate. */
    private JavaLibraryRules() {
    }

    static void addAccumulateClassNamesStep(JavaLibrary javaLibrary, BuildableContext buildableContext,
            ImmutableList.Builder<Step> steps) {
        Preconditions.checkNotNull(javaLibrary);

        Path pathToClassHashes = JavaLibraryRules.getPathToClassHashes(javaLibrary.getBuildTarget());
        steps.add(new MkdirStep(pathToClassHashes.getParent()));
        steps.add(new AccumulateClassNamesStep(Optional.fromNullable(javaLibrary.getPathToOutputFile()),
                pathToClassHashes));
        buildableContext.recordArtifact(pathToClassHashes);
    }

    static JavaLibrary.Data initializeFromDisk(BuildTarget buildTarget, OnDiskBuildInfo onDiskBuildInfo) {
        Optional<Sha1HashCode> abiKeyHash = onDiskBuildInfo.getHash(AbiRule.ABI_KEY_ON_DISK_METADATA);
        if (!abiKeyHash.isPresent()) {
            throw new IllegalStateException(String
                    .format("Should not be initializing %s from disk if the ABI key is not written.", buildTarget));
        }

        List<String> lines;
        try {
            lines = onDiskBuildInfo.getOutputFileContentsByLine(getPathToClassHashes(buildTarget));
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
        ImmutableSortedMap<String, HashCode> classHashes = AccumulateClassNamesStep.parseClassHashes(lines);

        return new JavaLibrary.Data(abiKeyHash.get(), classHashes);
    }

    private static Path getPathToClassHashes(BuildTarget buildTarget) {
        return BuildTargets.getGenPath(buildTarget, "%s.classes.txt");
    }
}