harp.script.root.RootContextBuilder.java Source code

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Here is the source code for harp.script.root.RootContextBuilder.java

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/*
 * Copyright 2014 Yash Parghi
 *
 * 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 harp.script.root;

import com.google.common.base.Preconditions;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

/**
 * A builder for assembling a RootContext in the course of evaluating a root.harp script.
 */
public final class RootContextBuilder {

    private final Set<String> environmentNames;
    private final List<Environment> environments;

    public RootContextBuilder() {
        this.environments = new ArrayList<>();
        this.environmentNames = new HashSet<>();
    }

    void addEnvironment(Environment environment) {
        Preconditions.checkNotNull(environment.getName(), "An Environment must have a non-null name.");
        Preconditions.checkState(!environmentNames.contains(environment.getName()),
                "An Environment named %s has already been declared.", environment.getName());
        environmentNames.add(environment.getName());
        environments.add(environment);
    }

    RootContext build() {
        return new RootContext(environments);
    }
}