tech.tablesaw.columns.strings.StringReduceUtils Maven / Gradle / Ivy

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/*
 * 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 tech.tablesaw.columns.strings;

import tech.tablesaw.columns.Column;

public interface StringReduceUtils extends Column, Iterable {

    /**
     * Returns a single string made by appending all the strings in this column, separated by the given delimiter
     */
    default String appendAll(String delimiter) {
        StringBuilder builder = new StringBuilder();
        int count = 0;
        for (String next : this) {
            builder.append(next);
            if (count < size() - 1) {
                builder.append(delimiter);
                count++;
            } else {
                break;
            }
        }
        return builder.toString();
    }

    /**
     * Returns a single string made by appending all the strings in this column, separated by a single space character
     */
    default String appendAll() {
        return appendAll(" ");
    }
}