/*
 * Copyright (c) 2018, 2018, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 */
package com.oracle.svm.core.option;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import com.oracle.svm.core.SubstrateUtil;

This class contains static helper methods related to options.
/**
 * This class contains static helper methods related to options.
 */
public class OptionUtils {

    
Utility for string option values that are a, e.g., comma-separated list, but can also be provided multiple times on the command line (so the option type is String[]). The returned list contains all trimmed string parts, with empty strings filtered out. /**
     * Utility for string option values that are a, e.g., comma-separated list, but can also be
     * provided multiple times on the command line (so the option type is String[]). The returned
     * list contains all {@link String#trim() trimmed} string parts, with empty strings filtered
     * out.
     */
    public static List<String> flatten(String delimiter, String[] values) {
        if (values == null) {
            return Collections.emptyList();
        }
        List<String> result = new ArrayList<>();
        for (String value : values) {
            if (value != null && !value.isEmpty()) {
                for (String component : SubstrateUtil.split(value, delimiter)) {
                    String trimmed = component.trim();
                    if (!trimmed.isEmpty()) {
                        result.add(trimmed);
                    }
                }
            }
        }
        return result;
    }
}