com.google.devtools.build.lib.rules.ToolchainProvider.java Source code

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Here is the source code for com.google.devtools.build.lib.rules.ToolchainProvider.java

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// Copyright 2016 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.rules;

import com.google.common.collect.ImmutableMap;
import com.google.devtools.build.lib.analysis.RuleConfiguredTarget.Mode;
import com.google.devtools.build.lib.analysis.RuleContext;
import com.google.devtools.build.lib.analysis.TransitiveInfoProvider;
import com.google.devtools.build.lib.concurrent.ThreadSafety.Immutable;
import java.util.TreeMap;

/**
 * A toolchain, determined from the current platform.
 */
@Immutable
public final class ToolchainProvider implements TransitiveInfoProvider {
    private final ImmutableMap<String, String> makeVariables;

    public ToolchainProvider(ImmutableMap<String, String> makeVariables) {
        this.makeVariables = makeVariables;
    }

    public ImmutableMap<String, String> getMakeVariables() {
        return makeVariables;
    }

    public static ImmutableMap<String, String> getToolchainMakeVariables(RuleContext ruleContext,
            String attributeName) {
        // Cannot be an ImmutableMap.Builder because we want to support duplicate keys
        TreeMap<String, String> result = new TreeMap<>();
        for (ToolchainProvider provider : ruleContext.getPrerequisites(attributeName, Mode.TARGET,
                ToolchainProvider.class)) {
            result.putAll(provider.getMakeVariables());
        }

        return ImmutableMap.copyOf(result);
    }
}