Examples of org.codehaus.groovy.runtime.callsite.BooleanClosureWrapper

Package org.codehaus.groovy.runtime.callsite

Examples of org.codehaus.groovy.runtime.callsite.BooleanClosureWrapper

org.codehaus.groovy.runtime.callsite.BooleanClosureWrapper
Helper class for internal use only. This allows to call a {@link Closure} and convert the result to a boolean. It will do this by caching the possible "doCall" as well as the "asBoolean" in CallSiteArray fashion. "asBoolean" will not be called if the result is null or a Boolean. In case of null we return false and in case of a Boolean we simply unbox. This logic is designed after the one present in {@link org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation#castToBoolean(Object)}. The purpose of this class is to avoid the slow "asBoolean" call in that method. {@link BooleanReturningMethodInvoker} is used for caching. @author Jochen "blackdrag" Theodorou

    public static Collection findAll(Object self) {
        return findAll(self, Closure.IDENTITY);
    }


    private static <T> Collection<T> findAll(Closure closure, Collection<T> answer, Iterator<? extends T> iter) {
        BooleanClosureWrapper bcw = new BooleanClosureWrapper(closure);
        while (iter.hasNext()) {
            T value = iter.next();
            if (bcw.call(value)) {
                answer.add(value);
            }
        }
        return answer;
    }

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     * @see    Iterator#remove()
     * @since 1.7.2
     */
    public static <T> boolean retainAll(Collection<T> self, @ClosureParams(FirstParam.FirstGenericType.class) Closure condition) {
        Iterator iter = InvokerHelper.asIterator(self);
        BooleanClosureWrapper bcw = new BooleanClosureWrapper(condition);
        boolean result = false;
        while (iter.hasNext()) {
            Object value = iter.next();
            if (!bcw.call(value)) {
                iter.remove();
                result = true;
            }
        }
        return result;

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     * @see    Iterator#remove()
     * @since 1.7.2
     */
    public static <T> boolean removeAll(Collection<T> self, @ClosureParams(FirstParam.FirstGenericType.class) Closure condition) {
        Iterator iter = InvokerHelper.asIterator(self);
        BooleanClosureWrapper bcw = new BooleanClosureWrapper(condition);
        boolean result = false;
        while (iter.hasNext()) {
            Object value = iter.next();
            if (bcw.call(value)) {
                iter.remove();
                result = true;
            }
        }
        return result;

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        return split(closure, accept, reject, iter);
    }


    private static <T> Collection<Collection<T>> split(Closure closure, Collection<T> accept, Collection<T> reject, Iterator<T> iter) {
        List<Collection<T>> answer = new ArrayList<Collection<T>>();
        BooleanClosureWrapper bcw = new BooleanClosureWrapper(closure);
        while (iter.hasNext()) {
            T value = iter.next();
            if (bcw.call(value)) {
                accept.add(value);
            } else {
                reject.add(value);
            }
        }

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     * @return a new subMap
     * @since 1.0
     */
    public static <K, V> Map<K, V> findAll(Map<K, V> self, @ClosureParams(MapEntryOrKeyValue.class)  Closure closure) {
        Map<K, V> answer = createSimilarMap(self);
        BooleanClosureWrapper bcw = new BooleanClosureWrapper(closure);
        for (Map.Entry<K, V> entry : self.entrySet()) {
            if (bcw.callForMap(entry)) {
                answer.put(entry.getKey(), entry.getValue());
            }
        }
        return answer;
    }

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     *         the given closure evaluates to true
     * @since 1.8.7
     */
    public static <T> List<T> takeWhile(List<T> self, @ClosureParams(FirstParam.FirstGenericType.class) Closure condition) {
        int num = 0;
        BooleanClosureWrapper bcw = new BooleanClosureWrapper(condition);
        for (T value : self) {
            if (bcw.call(value)) {
                num += 1;
            } else {
                break;
            }
        }

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    public static <K, V> Map<K, V> takeWhile(Map<K, V> self, @ClosureParams(MapEntryOrKeyValue.class) Closure<?> condition) {
        if (self.isEmpty()) {
            return createSimilarMap(self);
        }
        Map<K, V> ret = createSimilarMap(self);
        BooleanClosureWrapper bcw = new BooleanClosureWrapper(condition);
        for (Map.Entry<K, V> entry : self.entrySet()) {
            if (!bcw.callForMap(entry)) break;
            ret.put(entry.getKey(), entry.getValue());
        }
        return ret;
    }

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     *         the given closure evaluates to true
     * @since 1.8.7
     */
    public static <T> T[] takeWhile(T[] self, @ClosureParams(FirstParam.Component.class) Closure condition) {
        int num = 0;
        BooleanClosureWrapper bcw = new BooleanClosureWrapper(condition);
        while (num < self.length) {
            T value = self[num];
            if (bcw.call(value)) {
                num += 1;
            } else {
                break;
            }
        }

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     *         evaluates to true for each element dropped from the front of the List
     * @since 1.8.7
     */
    public static <T> List<T> dropWhile(List<T> self, @ClosureParams(FirstParam.FirstGenericType.class) Closure<?> condition) {
        int num = 0;
        BooleanClosureWrapper bcw = new BooleanClosureWrapper(condition);
        for (T value : self) {
            if (bcw.call(value)) {
                num += 1;
            } else {
                break;
            }
        }

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        if (self.isEmpty()) {
            return createSimilarMap(self);
        }
        Map<K, V> ret = createSimilarMap(self);
        boolean dropping = true;
        BooleanClosureWrapper bcw = new BooleanClosureWrapper(condition);
        for (Map.Entry<K, V> entry : self.entrySet()) {
            if (dropping && !bcw.callForMap(entry)) dropping = false;
            if (!dropping) ret.put(entry.getKey(), entry.getValue());
        }
        return ret;
    }

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