Java List Select selectFields(String[] fields, List fieldList, int allFieldsFrom, String separator)

Description

select Fields

License

Apache License

Declaration

private static String selectFields(String[] fields,
            List<Integer> fieldList, int allFieldsFrom, String separator) 

Method Source Code

//package com.java2s;
/**/*from   ww w.java2s .  c  o m*/
 * 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.
 */

import java.util.List;

public class Main {
    private static String selectFields(String[] fields,
            List<Integer> fieldList, int allFieldsFrom, String separator) {
        String retv = null;
        int i = 0;
        StringBuffer sb = null;
        if (fieldList != null && fieldList.size() > 0) {
            if (sb == null) {
                sb = new StringBuffer();
            }
            for (Integer index : fieldList) {
                if (index < fields.length) {
                    sb.append(fields[index]);
                }
                sb.append(separator);
            }
        }
        if (allFieldsFrom >= 0) {
            if (sb == null) {
                sb = new StringBuffer();
            }
            for (i = allFieldsFrom; i < fields.length; i++) {
                sb.append(fields[i]).append(separator);
            }
        }
        if (sb != null) {
            retv = sb.toString();
            if (retv.length() > 0) {
                retv = retv.substring(0, retv.length() - 1);
            }
        }
        return retv;
    }
}

Related

1. select(List list, List indices, List sel)
2. select(List src, List indexes)
3. selectDuplicateQualifiers( List elements)
4. selectElements(final List list, int start, int end)
5. selectExactly(List original, int nb)
6. selectRandom(List list)
7. selectTopN(List originalList, int topN, Comparator