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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 hivemall.utils;

import hivemall.model.FeatureValue;

import java.util.Arrays;
import java.util.Collections;
import java.util.List;

import javax.annotation.Nonnull;

import org.apache.hadoop.io.Text;

public final class HivemallUtils {

    private HivemallUtils() {}

    @Nonnull
    public static List parseTextFeaturesAsString(@Nonnull final List args) {
        final int size = args.size();
        if (size == 0) {
            return Collections.emptyList();
        }
        final FeatureValue[] array = new FeatureValue[size];
        for (int i = 0; i < size; i++) {
            Text t = args.get(i);
            if (t == null) {
                continue;
            }
            FeatureValue fv = FeatureValue.parseFeatureAsString(t);
            array[i] = fv;
        }
        return Arrays.asList(array);
    }

}