Examples of org.apache.commons.collections4.map.LRUMap

Package org.apache.commons.collections4.map

Examples of org.apache.commons.collections4.map.LRUMap

org.apache.commons.collections4.FunctorException
A Map implementation with a fixed maximum size which removes the least recently used entry if an entry is added when full.
The least recently used algorithm works on the get and put operations only. Iteration of any kind, including setting the value by iteration, does not change the order. Queries such as containsKey and containsValue or access via views also do not change the order.
A somewhat subtle ramification of the least recently used algorithm is that calls to {@link #get(Object)} stand a very good chanceof modifying the map's iteration order and thus invalidating any iterators currently in use. It is therefore suggested that iterations over an {@link LRUMap} instance access entry values only through a{@link org.apache.commons.collections4.MapIterator MapIterator} or {@link #entrySet()} iterator.
The map implements OrderedMap and entries may be queried using the bidirectional OrderedMapIterator. The order returned is least recently used to most recently used. Iterators from map views can also be cast to OrderedIterator if required.
All the available iterators can be reset back to the start by casting to ResettableIterator and calling reset().
Note that LRUMap is not synchronized and is not thread-safe. If you wish to use this map from multiple threads concurrently, you must use appropriate synchronization. The simplest approach is to wrap this map using {@link java.util.Collections#synchronizedMap(Map)}. This class may throw NullPointerException's when accessed by concurrent threads. @since 3.0 (previously in main package v1.0) @version $Id: LRUMap.java 1477799 2013-04-30 19:56:11Z tn $

     * @param input  the input object to transform
     * @return never
     * @throws FunctorException always
     */
    public O transform(final I input) {
        throw new FunctorException("ExceptionTransformer invoked");
    }

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        public T create() {
            try {
                return clazz.newInstance();
            } catch (final Exception ex) {
                throw new FunctorException("Cannot instantiate class: " + clazz, ex);
            }
        }

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        try {
            final Class<?> cls = input.getClass();
            final Method method = cls.getMethod(iMethodName, iParamTypes);
            return (O) method.invoke(input, iArgs);
        } catch (final NoSuchMethodException ex) {
            throw new FunctorException("InvokerTransformer: The method '" + iMethodName + "' on '" +
                                       input.getClass() + "' does not exist");
        } catch (final IllegalAccessException ex) {
            throw new FunctorException("InvokerTransformer: The method '" + iMethodName + "' on '" +
                                       input.getClass() + "' cannot be accessed");
        } catch (final InvocationTargetException ex) {
            throw new FunctorException("InvokerTransformer: The method '" + iMethodName + "' on '" +
                                       input.getClass() + "' threw an exception", ex);
        }
    }

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        public T create() {
            try {
                return clazz.newInstance();
            } catch (final Exception ex) {
                throw new FunctorException("Cannot instantiate class: " + clazz, ex);
            }
        }

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     *
     * @param input  the input object
     * @throws FunctorException always
     */
    public void execute(final E input) {
        throw new FunctorException("ExceptionClosure invoked");
    }

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                bais = new ByteArrayInputStream(baos.toByteArray());
                final ObjectInputStream in = new ObjectInputStream(bais);
                return (T) in.readObject();


            } catch (final ClassNotFoundException ex) {
                throw new FunctorException(ex);
            } catch (final IOException ex) {
                throw new FunctorException(ex);
            } finally {
                try {
                    if (bais != null) {
                        bais.close();
                    }

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     * @throws FunctorException if the transformer returns an invalid type
     */
    public boolean evaluate(final T object) {
        final Boolean result = iTransformer.transform(object);
        if (result == null) {
            throw new FunctorException(
                    "Transformer must return an instanceof Boolean, it was a null object");
        }
        return result.booleanValue();
    }

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     * @param input  the input object to transform
     * @return never
     * @throws FunctorException always
     */
    public O transform(final I input) {
        throw new FunctorException("ExceptionTransformer invoked");
    }

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     * @param object  the input object
     * @return never
     * @throws FunctorException always
     */
    public boolean evaluate(final T object) {
        throw new FunctorException("ExceptionPredicate invoked");
    }

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     *
     * @return never
     * @throws FunctorException always
     */
    public T create() {
        throw new FunctorException("ExceptionFactory invoked");
    }

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junit.framework.TestSuite

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org.apache.commons.collections4.functors.ExceptionTransformer

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