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

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

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// Copyright 2014 Google Inc. 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.base.Preconditions;
import com.google.devtools.build.lib.analysis.TransitiveInfoCollection;

/**
 * An abstract class for adding a Skylark API for the native providers.
 * Derived classes should declare functions to be used from Skylark.
 */
public abstract class SkylarkApiProvider {
    private TransitiveInfoCollection info;

    protected TransitiveInfoCollection getInfo() {
        return info;
    }

    /** Must be called once (and only once). */
    public void init(TransitiveInfoCollection info) {
        Preconditions.checkState(this.info == null);
        this.info = Preconditions.checkNotNull(info);
    }
}