Examples of org.apache.commons.collections4.functors.ComparatorPredicate

Package org.apache.commons.collections4.functors

Examples of org.apache.commons.collections4.functors.ComparatorPredicate

org.apache.commons.collections4.FunctorException
Predicate that compares the input object with the one stored in the predicate using a comparator. In addition, the comparator result can be evaluated in accordance to a supplied criterion value. In order to demonstrate the use of the predicate, the following variables are declared:
```
 Integer ONE = Integer.valueOf(1); Integer TWO = Integer.valueOf(2); Comparator comparator = new Comparator() { public int compare(Object first, Object second) { return ((Integer) second) - ((Integer) first); } }; 
```
Using the declared variables, the ComparatorPredicate can be used used in the following way:
```
 ComparatorPredicate.comparatorPredicate(ONE, comparator).evaluate(TWO); 
```
The input variable TWO in compared to the stored variable ONE using the supplied comparator. This is the default usage of the predicate and will return true if the underlying comparator returns 0. In addition to the default usage of the predicate, it is possible to evaluate the comparator's result in several ways. The following {@link Criterion} enumeration values are provided by the predicate:
- EQUAL
- GREATER
- GREATER_OR_EQUAL
- LESS
- LESS_OR_EQUAL
The following examples demonstrates how these constants can be used in order to manipulate the evaluation of a comparator result.
```
 ComparatorPredicate.comparatorPredicate(ONE, comparator,ComparatorPredicate.Criterion.GREATER).evaluate(TWO); 
```
The input variable TWO is compared to the stored variable ONE using the supplied comparator using the GREATER evaluation criterion constant. This instructs the predicate to return true if the comparator returns a value greater than 0. @since 4.0 @version $Id: ComparatorPredicate.java 1477798 2013-04-30 19:49:02Z tn $

  }


  //loads the files and removes words which occur less than 5 tims
  public void loadProgram() throws FileNotFoundException
  {
    Bag wordBag = new HashBag();


    //Load all the medical files in the directory
    File[] fileList = new File(recordsDir).listFiles();
    for (int i = 0; i<fileList.length; i++) {
      loadFile(fileList[i].toString(), wordBag);
    }


    //dump bag into frequent who appear in 5 or more medical records
    for (Object obj : wordBag.uniqueSet()) {
      if (wordBag.getCount(obj) > 4){
        frequent.add((String)obj);
      }
    }


  }

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

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     * @return true if decorated predicate returns true
     * @throws FunctorException if input is null
     */
    public boolean evaluate(final T object) {
        if (object == null) {
            throw new FunctorException("Input Object must not be null");
        }
        return iPredicate.evaluate(object);
    }

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     * @return the transformed result
     */
    public T transform(final Class<? extends T> input) {
        try {
            if (input == null) {
                throw new FunctorException(
                    "InstantiateTransformer: Input object was not an instanceof Class, it was a null object");
            }
            final Constructor<? extends T> con = input.getConstructor(iParamTypes);
            return con.newInstance(iArgs);
        } catch (final NoSuchMethodException ex) {
            throw new FunctorException("InstantiateTransformer: The constructor must exist and be public ");
        } catch (final InstantiationException ex) {
            throw new FunctorException("InstantiateTransformer: InstantiationException", ex);
        } catch (final IllegalAccessException ex) {
            throw new FunctorException("InstantiateTransformer: Constructor must be public", ex);
        } catch (final InvocationTargetException ex) {
            throw new FunctorException("InstantiateTransformer: Constructor threw an exception", ex);
        }
    }

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        }


        try {
            return iConstructor.newInstance(iArgs);
        } catch (final InstantiationException ex) {
            throw new FunctorException("InstantiateFactory: InstantiationException", ex);
        } catch (final IllegalAccessException ex) {
            throw new FunctorException("InstantiateFactory: Constructor must be public", ex);
        } catch (final InvocationTargetException ex) {
            throw new FunctorException("InstantiateFactory: Constructor threw an exception", ex);
        }
    }

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