Java List Sort formatAsSortUniqCSVString(List s)

Description

list of strings to one string comma separated.
e.g.

License

Apache License

Parameter

Parameter	Description
selection	a parameter

Declaration

public static String formatAsSortUniqCSVString(List<String> s) 

Method Source Code

//package com.java2s;
/**//from  w  ww.ja  va2  s.c  o  m
 * OLAT - Online Learning and Training<br>
 * http://www.olat.org
 * <p>
 * Licensed under the Apache License, Version 2.0 (the "License"); <br>
 * you may not use this file except in compliance with the License.<br>
 * You may obtain a copy of the License at
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * Unless required by applicable law or agreed to in writing,<br>
 * software distributed under the License is distributed on an "AS IS" BASIS, <br>
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. <br>
 * See the License for the specific language governing permissions and <br>
 * limitations under the License.
 * <p>
 * Copyright (c) 1999-2006 at Multimedia- & E-Learning Services (MELS),<br>
 * University of Zurich, Switzerland.
 * <p>
 */

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

import java.util.HashMap;
import java.util.Iterator;
import java.util.List;

import java.util.Map;
import java.util.Set;

public class Main {
    /**
     * list of strings to one string comma separated.<br>
     * e.g. ["z","a","b","c","s","a"] -> "a, b, c, s, z" No duplicates, alphabetically sorted
     * 
     * @param selection
     * @return
     */
    public static String formatAsSortUniqCSVString(List<String> s) {

        Map<String, String> u = new HashMap<String, String>();
        for (Iterator<String> si = s.iterator(); si.hasNext();) {
            u.put(si.next().trim(), null);
        }

        List<String> rv = new ArrayList<String>();
        rv.addAll(u.keySet());
        rv.remove("");
        Collections.sort(rv);

        return formatAsCSVString(rv);
    }

    /**
     * list of strings to one string comma separated.<br>
     * e.g. ["z","a","b","c","s","a"] -> "a, b, c, s, z" No duplicates, alphabetically sorted
     * 
     * @param selection
     * @return
     */
    public static String formatAsSortUniqCSVString(Set<String> s) {

        Map<String, String> u = new HashMap<String, String>();
        for (Iterator<String> si = s.iterator(); si.hasNext();) {
            u.put(si.next().trim(), null);
        }

        List<String> rv = new ArrayList<String>();
        rv.addAll(u.keySet());
        rv.remove("");
        Collections.sort(rv);

        return formatAsCSVString(rv);
    }

    /**
     * set of strings to one string comma separated.<br>
     * e.g. ["a","b","c","s"] -> "a,b,c,s"
     * 
     * @param selection
     * @return
     */
    public static String formatAsCSVString(Set<String> entries) {
        boolean isFirst = true;
        String csvStr = null;
        for (Iterator<String> iter = entries.iterator(); iter.hasNext();) {
            String group = iter.next();
            if (isFirst) {
                csvStr = group;
                isFirst = false;
            } else {
                csvStr += ", " + group;
            }
        }
        return csvStr;
    }

    /**
     * list of strings to one string comma separated.<br>
     * e.g. ["a","b","c","s"] -> "a,b,c,s"
     * 
     * @param selection
     * @return
     */
    public static String formatAsCSVString(List<String> entries) {
        boolean isFirst = true;
        String csvStr = null;
        for (Iterator<String> iter = entries.iterator(); iter.hasNext();) {
            String group = iter.next();
            if (isFirst) {
                csvStr = group;
                isFirst = false;
            } else {
                csvStr += ", " + group;
            }
        }
        return csvStr;
    }
}

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