Examples of org.apache.commons.collections.FastHashMap

org.apache.commons.collections.FastHashMap
A customized implementation of java.util.HashMap designed to operate in a multithreaded environment where the large majority of method calls are read-only, instead of structural changes. When operating in "fast" mode, read calls are non-synchronized and write calls perform the following steps:
- Clone the existing collection
- Perform the modification on the clone
- Replace the existing collection with the (modified) clone
When first created, objects of this class default to "slow" mode, where all accesses of any type are synchronized but no cloning takes place. This is appropriate for initially populating the collection, followed by a switch to "fast" mode (by calling setFast(true)) after initialization is complete.

NOTE: If you are creating and accessing a HashMap only within a single thread, you should use java.util.HashMap directly (with no synchronization), for maximum performance.
@author Craig R. McClanahan @version $Revision: 1.4 $ $Date: 2001/05/20 21:03:30 $

                    return (descriptors[i]);
            }
        }


        PropertyDescriptor result = null;
        FastHashMap mappedDescriptors =
                getMappedPropertyDescriptors(bean);
        if (mappedDescriptors == null) {
            mappedDescriptors = new FastHashMap();
            mappedDescriptors.setFast(true);
            mappedDescriptorsCache.put(bean.getClass(), mappedDescriptors);
        }
        result = (PropertyDescriptor) mappedDescriptors.get(name);
        if (result == null) {
            // not found, try to create it
            try {
                result =
                        new MappedPropertyDescriptor(name, bean.getClass());
            } catch (IntrospectionException ie) {
            }
            if (result != null) {
                mappedDescriptors.put(name, result);
            }
        }
        return result;


    }

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    /**
     * Remove any registered {@link LocaleConverter}.
     */
    public static void deregister() {


        FastHashMap defaultConverter = lookup(defaultLocale);


        mapConverters.setFast(false);


        mapConverters.clear();
        mapConverters.put(defaultLocale, defaultConverter);

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     * @param locale The Locale
     * @return The FastHashMap instance contains the all {@LocaleConverter} types for
     *  the specified locale.
     */
    protected static FastHashMap lookup(Locale locale) {
        FastHashMap localeConverters;


        if (locale == null) {
            localeConverters = (FastHashMap) mapConverters.get(defaultLocale);
        }
        else {

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     * @return The FastHashMap instance contains the all {@LocaleConverter} types
     *  for the specified locale.
     */
    protected static FastHashMap create(Locale locale) {


        FastHashMap converter = new FastHashMap();
        converter.setFast(false);


        converter.put(BigDecimal.class, new BigDecimalLocaleConverter(locale, applyLocalized));
        converter.put(BigInteger.class, new BigIntegerLocaleConverter(locale, applyLocalized));


        converter.put(Byte.class, new ByteLocaleConverter(locale, applyLocalized));
        converter.put(Byte.TYPE, new ByteLocaleConverter(locale, applyLocalized));


        converter.put(Double.class, new DoubleLocaleConverter(locale, applyLocalized));
        converter.put(Double.TYPE, new DoubleLocaleConverter(locale, applyLocalized));


        converter.put(Float.class, new FloatLocaleConverter(locale, applyLocalized));
        converter.put(Float.TYPE, new FloatLocaleConverter(locale, applyLocalized));


        converter.put(Integer.class, new IntegerLocaleConverter(locale, applyLocalized));
        converter.put(Integer.TYPE, new IntegerLocaleConverter(locale, applyLocalized));


        converter.put(Long.class, new LongLocaleConverter(locale, applyLocalized));
        converter.put(Long.TYPE, new LongLocaleConverter(locale, applyLocalized));


        converter.put(Short.class, new ShortLocaleConverter(locale, applyLocalized));
        converter.put(Short.TYPE, new ShortLocaleConverter(locale, applyLocalized));


        converter.put(String.class, new StringLocaleConverter(locale, applyLocalized));


        converter.put(Date.class, new SqlDateLocaleConverter(locale, applyLocalized));
        converter.put(Time.class, new SqlTimeLocaleConverter(locale, applyLocalized));
        converter.put(Timestamp.class, new SqlTimestampLocaleConverter(locale, applyLocalized));


        converter.setFast(true);


        return converter;
    }

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    // FIXME Unbounded map - the road to OOME
    protected Map cache;




    public DefaultCacheManager() {
        this.cache = new FastHashMap();
    }

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     * @since          Validator 1.2.0
     */
    protected void merge(Form depends) {


        List templFields = new ArrayList();
        Map temphFields = new FastHashMap();
        Iterator dependsIt = depends.getFields().iterator();
        while (dependsIt.hasNext()) {
            Field defaultField = (Field) dependsIt.next();
            if (defaultField != null) {
                String fieldKey = defaultField.getKey();
                if (!this.containsField(fieldKey)) {
                    templFields.add(defaultField);
                    temphFields.put(fieldKey, defaultField);
                }
                else {
                    Field old = getField(fieldKey);
                    hFields.remove(fieldKey);
                    lFields.remove(old);
                    templFields.add(old);
                    temphFields.put(fieldKey, old);
                }
            }
        }
        lFields.addAll(0, templFields);
        hFields.putAll(temphFields);

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     * @deprecated This method is not part of Validator's public API.  Validator
     * will use it internally until FastHashMap references are removed.  Use
     * copyMap() instead.
     */
    public static FastHashMap copyFastHashMap(FastHashMap map) {
        FastHashMap results = new FastHashMap();


        Iterator i = map.entrySet().iterator();
        while (i.hasNext()) {
            Entry entry = (Entry) i.next();
            String key = (String) entry.getKey();
            Object value = entry.getValue();


            if (value instanceof Msg) {
                results.put(key, ((Msg) value).clone());
            } else if (value instanceof Arg) {
                results.put(key, ((Arg) value).clone());
            } else if (value instanceof Var) {
                results.put(key, ((Var) value).clone());
            } else {
                results.put(key, value);
            }
        }


        results.setFast(true);
        return results;
    }

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                    return (descriptors[i]);
            }
        }


        PropertyDescriptor result = null;
        FastHashMap mappedDescriptors =
                getMappedPropertyDescriptors(bean);
        if (mappedDescriptors == null) {
            mappedDescriptors = new FastHashMap();
            mappedDescriptors.setFast(true);
            mappedDescriptorsCache.put(bean.getClass(), mappedDescriptors);
        }
        result = (PropertyDescriptor) mappedDescriptors.get(name);
        if (result == null) {
            // not found, try to create it
            try {
                result =
                        new MappedPropertyDescriptor(name, bean.getClass());
            } catch (IntrospectionException ie) {
            }
            if (result != null) {
                mappedDescriptors.put(name, result);
            }
        }
        return result;


    }

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    public static void deregister() {






        FastHashMap defaultConverter = lookup(defaultLocale);






        mapConverters.setFast(false);

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     */


    protected static FastHashMap lookup(Locale locale) {


        FastHashMap localeConverters;






        if (locale == null) {

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