Utils.java Source code

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Here is the source code for Utils.java

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/*
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 * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
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 * 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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 * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the
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import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

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

public class Utils {

    /**
     * Create a typesafe copy of a raw map.
     * @param rawMap an unchecked map
     * @param keyType the desired supertype of the keys
     * @param valueType the desired supertype of the values
     * @param strict true to throw a <code>ClassCastException</code> if the raw map has an invalid key or value,
     *               false to skip over such map entries (warnings may be logged)
     * @return a typed map guaranteed to contain only keys and values assignable
     *         to the named types (or they may be null)
     * @throws ClassCastException if some key or value in the raw map was not well-typed, and only if <code>strict</code> was true
     */
    public static <K, V> Map<K, V> checkedMapByCopy(Map rawMap, Class<K> keyType, Class<V> valueType,
            boolean strict) throws ClassCastException {
        Map<K, V> m2 = new HashMap<K, V>(rawMap.size() * 4 / 3 + 1);
        Iterator it = rawMap.entrySet().iterator();
        while (it.hasNext()) {
            Map.Entry e = (Map.Entry) it.next();
            try {
                m2.put(keyType.cast(e.getKey()), valueType.cast(e.getValue()));
            } catch (ClassCastException x) {
                if (strict) {
                    throw x;
                } else {
                    System.out.println("not assignable");
                }
            }
        }
        return m2;
    }
}