com.google.devtools.build.lib.actions.CompositeRunfilesSupplier.java Source code

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Here is the source code for com.google.devtools.build.lib.actions.CompositeRunfilesSupplier.java

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// Copyright 2015 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.actions;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Maps;
import com.google.devtools.build.lib.vfs.PathFragment;
import java.io.IOException;
import java.util.Map;

/** A {@link RunfilesSupplier} implementation for composing multiple instances. */
// TODO(michajlo): Move creation to factory constructor and optimize structure of the returned
// supplier, ie: [] -> EmptyRunfilesSupplier, [singleSupplier] -> supplier,
// [Empty, single] -> single, and so on.
public class CompositeRunfilesSupplier implements RunfilesSupplier {

    private final ImmutableList<RunfilesSupplier> suppliers;

    /** Create an instance with {@code first} taking precedence over {@code second}. */
    public CompositeRunfilesSupplier(RunfilesSupplier first, RunfilesSupplier second) {
        this(ImmutableList.of(first, second));
    }

    /**
     * Create an instance combining all of {@code suppliers}, with earlier elements taking precedence.
     */
    public CompositeRunfilesSupplier(Iterable<RunfilesSupplier> suppliers) {
        this.suppliers = ImmutableList.copyOf(suppliers);
    }

    @Override
    public Iterable<Artifact> getArtifacts() {
        ImmutableSet.Builder<Artifact> result = ImmutableSet.builder();
        for (RunfilesSupplier supplier : suppliers) {
            result.addAll(supplier.getArtifacts());
        }
        return result.build();
    }

    @Override
    public ImmutableSet<PathFragment> getRunfilesDirs() {
        ImmutableSet.Builder<PathFragment> result = ImmutableSet.builder();
        for (RunfilesSupplier supplier : suppliers) {
            result.addAll(supplier.getRunfilesDirs());
        }
        return result.build();
    }

    @Override
    public ImmutableMap<PathFragment, Map<PathFragment, Artifact>> getMappings() throws IOException {
        Map<PathFragment, Map<PathFragment, Artifact>> result = Maps.newHashMap();
        for (RunfilesSupplier supplier : suppliers) {
            Map<PathFragment, Map<PathFragment, Artifact>> mappings = supplier.getMappings();
            for (Map.Entry<PathFragment, Map<PathFragment, Artifact>> entry : mappings.entrySet()) {
                result.putIfAbsent(entry.getKey(), entry.getValue());
            }
        }
        return ImmutableMap.copyOf(result);
    }

    @Override
    public ImmutableList<Artifact> getManifests() {
        ImmutableList.Builder<Artifact> result = ImmutableList.builder();
        for (RunfilesSupplier supplier : suppliers) {
            result.addAll(supplier.getManifests());
        }
        return result.build();
    }
}