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
 * License. You can obtain a copy of the License at
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 */

import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;

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

public class Utils {

    /**
     * Create a typesafe copy of a raw set.
     * @param rawSet an unchecked set
     * @param type the desired supertype of the entries
     * @param strict true to throw a <code>ClassCastException</code> if the raw set has an invalid entry,
     *               false to skip over such entries (warnings may be logged)
     * @return a typed set guaranteed to contain only entries assignable
     *         to the named type (or they may be null)
     * @throws ClassCastException if some entry in the raw set was not well-typed, and only if <code>strict</code> was true
     */
    public static <E> Set<E> checkedSetByCopy(Set rawSet, Class<E> type, boolean strict) throws ClassCastException {
        Set<E> s = new HashSet<E>(rawSet.size() * 4 / 3 + 1);
        Iterator it = rawSet.iterator();
        while (it.hasNext()) {
            Object e = it.next();
            try {
                s.add(type.cast(e));
            } catch (ClassCastException x) {
                if (strict) {
                    throw x;
                } else {
                    System.out.println("not assignable ");
                }
            }
        }
        return s;
    }
}