Java List First Item getFirstString(Object list)

Description

unqualify given dateVal.

License

Educational Community License

Parameter

Parameter	Description
input	a parameter

Return

name and dateVal

Declaration

public static String getFirstString(Object list) 

Method Source Code

//package com.java2s;
/**/*from  w  w w  .  java 2s . co  m*/
 *  This document is a part of the source code and related artifacts
 *  for CollectionSpace, an open source collections management system
 *  for museums and related institutions:

 *  http://www.collectionspace.org
 *  http://wiki.collectionspace.org

 *  Copyright 2009 University of California at Berkeley

 *  Licensed under the Educational Community License (ECL), Version 2.0.
 *  You may not use this file except in compliance with this License.

 *  You may obtain a copy of the ECL 2.0 License at

 *  https://source.collectionspace.org/collection-space/LICENSE.txt

 *  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 {
    /**
     * unqualify given dateVal. input of
     * otherNumber|urn:org.collectionspace.id:24082390 would be unqualified as
     * name=otherNumber and dateVal=urn:org.collectionspace.id:24082390
     * 
     * @param input
     * @return name and dateVal
     * @exception IllegalStateException
     *                private static NameValue unqualify(String input) {
     *                NameValue nv = new NameValue(); StringTokenizer stz = new
     *                StringTokenizer(input, NAME_VALUE_SEPARATOR); int tokens =
     *                stz.countTokens(); if (tokens == 2) { nv.name =
     *                stz.nextToken(); nv.dateVal = stz.nextToken(); // Allow
     *                null or empty values } else if (tokens == 1) { nv.name =
     *                stz.nextToken(); nv.dateVal = ""; } else { throw new
     *                IllegalStateException
     *                ("Unexpected format for multi valued element: " + input);
     *                } return nv; }
     */

    public static String getFirstString(Object list) {
        if (list == null) {
            return null;
        }
        if (list instanceof List) {
            return ((List) list).size() == 0 ? null
                    : (String) ((List) list).get(0);
        }
        Class<?> arrType = list.getClass().getComponentType();
        if ((arrType != null) && arrType.isPrimitive()) {
            if (arrType == Integer.TYPE) {
                int[] ar = (int[]) list;
                return ar.length == 0 ? null : String.valueOf(ar[0]);
            } else if (arrType == Long.TYPE) {
                long[] ar = (long[]) list;
                return ar.length == 0 ? null : String.valueOf(ar[0]);
            } else if (arrType == Double.TYPE) {
                double[] ar = (double[]) list;
                return ar.length == 0 ? null : String.valueOf(ar[0]);
            } else if (arrType == Float.TYPE) {
                float[] ar = (float[]) list;
                return ar.length == 0 ? null : String.valueOf(ar[0]);
            } else if (arrType == Character.TYPE) {
                char[] ar = (char[]) list;
                return ar.length == 0 ? null : String.valueOf(ar[0]);
            } else if (arrType == Byte.TYPE) {
                byte[] ar = (byte[]) list;
                return ar.length == 0 ? null : String.valueOf(ar[0]);
            } else if (arrType == Short.TYPE) {
                short[] ar = (short[]) list;
                return ar.length == 0 ? null : String.valueOf(ar[0]);
            }
            throw new IllegalArgumentException(
                    "Primitive list of unsupported type: " + list);
        }
        throw new IllegalArgumentException(
                "A value of list type is neither list neither array: "
                        + list);
    }
}

Related

1. getFirstOccurNic(List nics, String line)
2. getFirstOrNull(List elements)
3. getFirstOrNull(List list)
4. getFirstRowMatch(List list, int columnIndex, T value)
5. getFirstRowResults(List> llo, String reason)
6. getFirstValueString(List