org.apache.metron.common.utils.StringUtils.java Source code

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Here is the source code for org.apache.metron.common.utils.StringUtils.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.metron.common.utils;

import com.google.common.base.Joiner;
import java.util.Arrays;
import java.util.Optional;

public class StringUtils {
    public static String join(String delim, Optional<String>... parts) {
        return Joiner.on(delim).join(
                Arrays.asList(parts).stream().filter(part -> part.isPresent()).map(part -> part.get()).toArray());
    }

    /**
     * Strips specified number of lines from beginning for String val
     * @param val
     * @param numLines
     */
    public static String stripLines(String val, int numLines) {
        int start = org.apache.commons.lang3.StringUtils.ordinalIndexOf(val, System.lineSeparator(), numLines);
        start = start >= 0 ? start : 0;
        return val.substring(start);
    }

}