001: /**
002: * EasyBeans
003: * Copyright (C) 2006 Bull S.A.S.
004: * Contact: easybeans@ow2.org
005: *
006: * This library is free software; you can redistribute it and/or
007: * modify it under the terms of the GNU Lesser General Public
008: * License as published by the Free Software Foundation; either
009: * version 2.1 of the License, or any later version.
010: *
011: * This library is distributed in the hope that it will be useful,
012: * but WITHOUT ANY WARRANTY; without even the implied warranty of
013: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
014: * Lesser General Public License for more details.
015: *
016: * You should have received a copy of the GNU Lesser General Public
017: * License along with this library; if not, write to the Free Software
018: * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
019: * USA
020: *
021: * --------------------------------------------------------------------------
022: * $Id: ListHelper.java 1970 2007-10-16 11:49:25Z benoitf $
023: * --------------------------------------------------------------------------
024: */package org.ow2.easybeans.tests.common.helper;
025:
026: import java.util.List;
027:
028: /**
029: * This helper is used to do list modifications.
030: * @author Eduardo Studzinski Estima de Castro
031: * @author Gisele Pinheiro Souza
032: */
033: public final class ListHelper {
034:
035: /**
036: * Helper should have a private constructor.
037: *
038: */
039: private ListHelper() {
040: }
041:
042: /**
043: * Creates a new list with elements of a list, plus new values.
044: * @param <E> list type
045: * @param list current list
046: * @param values values to add
047: * @return new list with new values
048: * @throws InstantiationException reflection exception
049: * @throws IllegalAccessException reflection exception
050: */
051: @SuppressWarnings("unchecked")
052: public static <E> List<E> addValues(final List<E> list,
053: final E[] values) throws InstantiationException,
054: IllegalAccessException {
055:
056: if (list != null) {
057: //Creates a new instance using reflection
058: List<E> lstNew = list.getClass().newInstance();
059:
060: // Adds values from current list
061: lstNew.addAll(list);
062:
063: // Adds the new values
064: if (values != null) {
065: for (E eObj : values) {
066: lstNew.add(eObj);
067: }
068: }
069: return lstNew;
070: }
071: return null;
072: }
073:
074: /**
075: * Converts an List that does not use generics to a List with generic type.
076: * @param <E> the list type;
077: * @param list the corrent list.
078: * @return the generic list.
079: * @throws InstantiationException reflection exception.
080: * @throws IllegalAccessException reflection exception.
081: */
082: @SuppressWarnings("unchecked")
083: public static <E> List<E> convertListType(final List list)
084: throws InstantiationException, IllegalAccessException {
085: //verifies if the list is null
086: if (list != null) {
087: //creates a new instance of the list
088: List<E> lstReturn = list.getClass().newInstance();
089: //copy to the list with defined type
090: if (list.size() > 0) {
091: for (Object obj : list) {
092: lstReturn.add((E) obj);
093: }
094: }
095: return lstReturn;
096: }
097: return null;
098:
099: }
100:
101: }
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