Utils.java Source code

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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common
 * Development and Distribution License("CDDL") (collectively, the
 * "License"). You may not use this file except in compliance with the
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 * http://www.netbeans.org/cddl-gplv2.html
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import java.util.ArrayList;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.RandomAccess;

/**
 * @since 4.37
 * @author Jaroslav Tulach
 */

public class Utils {

    /**
     * Create a typesafe copy of a raw list.
     * @param rawList an unchecked list
     * @param type the desired supertype of the entries
     * @param strict true to throw a <code>ClassCastException</code> if the raw list has an invalid entry,
     *               false to skip over such entries (warnings may be logged)
     * @return a typed list guaranteed to contain only entries assignable
     *         to the named type (or they may be null)
     * @throws ClassCastException if some entry in the raw list was not well-typed, and only if <code>strict</code> was true
     */
    public static <E> List<E> checkedListByCopy(List rawList, Class<E> type, boolean strict)
            throws ClassCastException {
        List<E> l = (rawList instanceof RandomAccess) ? new ArrayList<E>(rawList.size()) : new LinkedList<E>();
        Iterator it = rawList.iterator();
        while (it.hasNext()) {
            Object e = it.next();
            try {
                l.add(type.cast(e));
            } catch (ClassCastException x) {
                if (strict) {
                    throw x;
                } else {
                    System.out.println("not assignable ");
                }
            }
        }
        return l;
    }
}