org.apache.drill.common.util.GuavaUtils.java Source code

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Here is the source code for org.apache.drill.common.util.GuavaUtils.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.drill.common.util;

import java.util.List;

/**
 * Utility class which contain methods for conversion guava and shaded guava classes.
 * Once outer libraries API remove usage of these classes, these methods should be removed.
 */
public class GuavaUtils {

    /**
     * Transforms specified list of lists into {@link com.google.common.collect.ImmutableList} of
     * {@link com.google.common.collect.ImmutableList} lists to pass it into the methods from other libraries.
     * @param tuples list to be transformed
     * @return transformed list
     */
    public static <T> com.google.common.collect.ImmutableList<com.google.common.collect.ImmutableList<T>> convertToNestedUnshadedImmutableList(
            List<? extends List<T>> tuples) {
        com.google.common.collect.ImmutableList.Builder<com.google.common.collect.ImmutableList<T>> immutableListBuilder = com.google.common.collect.ImmutableList
                .builder();
        for (List<T> tuple : tuples) {
            immutableListBuilder.add(convertToUnshadedImmutableList(tuple));
        }
        return immutableListBuilder.build();
    }

    public static <T> com.google.common.collect.ImmutableList<T> convertToUnshadedImmutableList(
            List<? extends T> source) {
        return com.google.common.collect.ImmutableList.copyOf(source);
    }
}