com.facebook.buck.cli.FetchTargetNodeToBuildRuleTransformer.java Source code

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Here is the source code for com.facebook.buck.cli.FetchTargetNodeToBuildRuleTransformer.java

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/*
 * Copyright 2015-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.cli;

import com.facebook.buck.model.BuildTarget;
import com.facebook.buck.parser.NoSuchBuildTargetException;
import com.facebook.buck.rules.BuildRule;
import com.facebook.buck.rules.BuildRuleResolver;
import com.facebook.buck.rules.DefaultTargetNodeToBuildRuleTransformer;
import com.facebook.buck.rules.Description;
import com.facebook.buck.rules.TargetGraph;
import com.facebook.buck.rules.TargetNode;
import com.facebook.buck.rules.TargetNodeToBuildRuleTransformer;
import com.google.common.collect.ImmutableSet;

class FetchTargetNodeToBuildRuleTransformer implements TargetNodeToBuildRuleTransformer {

    private final ImmutableSet<Description<?>> descriptions;
    // TODO(shs96c): Allow the TargetToActionGraph to be stateless.
    private final ImmutableSet.Builder<BuildTarget> downloadableTargets;
    private final DefaultTargetNodeToBuildRuleTransformer delegate;

    public FetchTargetNodeToBuildRuleTransformer(ImmutableSet<Description<?>> descriptions) {
        this.descriptions = descriptions;

        this.downloadableTargets = ImmutableSet.builder();
        this.delegate = new DefaultTargetNodeToBuildRuleTransformer();
    }

    @Override
    public <T, U extends Description<T>> BuildRule transform(TargetGraph targetGraph,
            BuildRuleResolver ruleResolver, TargetNode<T, U> targetNode) throws NoSuchBuildTargetException {
        TargetNode<?, ?> node = substituteTargetNodeIfNecessary(targetNode);
        return delegate.transform(targetGraph, ruleResolver, node);
    }

    public ImmutableSet<BuildTarget> getDownloadableTargets() {
        return downloadableTargets.build();
    }

    private TargetNode<?, ?> substituteTargetNodeIfNecessary(TargetNode<?, ?> node) {
        for (Description<?> description : descriptions) {
            if (Description.getBuildRuleType(node.getDescription())
                    .equals(Description.getBuildRuleType(description))) {
                downloadableTargets.add(node.getBuildTarget());
                return node.withDescription(description);
            }
        }
        return node;
    }
}