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

     * @return the number of occurrences
     * @since 1.8.0
     */
    public static <K,V> Number count(Map<K,V> self, @ClosureParams(MapEntryOrKeyValue.class) Closure<?> closure) {
        long answer = 0;
        BooleanClosureWrapper bcw = new BooleanClosureWrapper(closure);
        for (Object entry : self.entrySet()) {
            if (bcw.callForMap((Map.Entry)entry)) {
                ++answer;
            }
        }
        // for b/c with Java return an int if we can
        if (answer <= Integer.MAX_VALUE) return (int) answer;

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     * @param closure a closure condition
     * @return the first Object found or null if none was found
     * @since 1.0
     */
    public static Object find(Object self, Closure closure) {
        BooleanClosureWrapper bcw = new BooleanClosureWrapper(closure);
        for (Iterator iter = InvokerHelper.asIterator(self); iter.hasNext();) {
            Object value = iter.next();
            if (bcw.call(value)) {
                return value;
            }
        }
        return null;
    }

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     * @param closure a closure condition
     * @return the first Object found, in the order of the collections iterator, or null if no element matches
     * @since 1.0
     */
    public static <T> T find(Collection<T> self, @ClosureParams(FirstParam.FirstGenericType.class) Closure closure) {
        BooleanClosureWrapper bcw = new BooleanClosureWrapper(closure);
        for (T value : self) {
            if (bcw.call(value)) {
                return value;
            }
        }
        return null;
    }

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        }
    }


    public boolean isCase(Object candidate){
        if (bcw==null) {
            bcw = new BooleanClosureWrapper(this);
        }
        return bcw.call(candidate);
    }

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     *         evaluates to true for each element dropped from the front of the CharSequence
     * @since 2.0.0
     */
    public static CharSequence dropWhile(CharSequence self, @ClosureParams(value=SimpleType.class, options="char") Closure condition) {
        int num = 0;
        BooleanClosureWrapper bcw = new BooleanClosureWrapper(condition);
        while (num < self.length()) {
            char value = self.charAt(num);
            if (bcw.call(value)) {
                num += 1;
            } else {
                break;
            }
        }

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     *         element passed to the given closure evaluates to true
     * @since 2.0.0
     */
    public static CharSequence takeWhile(CharSequence self, @ClosureParams(value=SimpleType.class, options="char") Closure condition) {
        int num = 0;
        BooleanClosureWrapper bcw = new BooleanClosureWrapper(condition);
        while (num < self.length()) {
            char value = self.charAt(num);
            if (bcw.call(value)) {
                num += 1;
            } else {
                break;
            }
        }

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    public static void filterLine(Reader reader, Writer writer, @ClosureParams(value=SimpleType.class, options="java.lang.String") Closure closure) throws IOException {
        BufferedReader br = new BufferedReader(reader);
        BufferedWriter bw = new BufferedWriter(writer);
        String line;
        try {
            BooleanClosureWrapper bcw = new BooleanClosureWrapper(closure);
            while ((line = br.readLine()) != null) {
                if (bcw.call(line)) {
                    bw.write(line);
                    bw.newLine();
                }
            }
            bw.flush();

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        final BufferedReader br = new BufferedReader(reader);
        return new Writable() {
            public Writer writeTo(Writer out) throws IOException {
                BufferedWriter bw = new BufferedWriter(out);
                String line;
                BooleanClosureWrapper bcw = new BooleanClosureWrapper(closure);
                while ((line = br.readLine()) != null) {
                    if (bcw.call(line)) {
                        bw.write(line);
                        bw.newLine();
                    }
                }
                bw.flush();

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     * @param condition a closure condition
     * @return the first element from the array that matches the condition or null if no element matches
     * @since 2.0
     */
    public static <T> T find(T[] self, @ClosureParams(FirstParam.Component.class) Closure condition) {
        BooleanClosureWrapper bcw = new BooleanClosureWrapper(condition);
        for (T element : self) {
            if (bcw.call(element)) {
                return element;
            }
        }
        return null;
    }

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     * @param closure a 1 or 2 arg Closure condition
     * @return the first Object found
     * @since 1.0
     */
    public static <K, V> Map.Entry<K, V> find(Map<K, V> self, @ClosureParams(MapEntryOrKeyValue.class) Closure<?> closure) {
        BooleanClosureWrapper bcw = new BooleanClosureWrapper(closure);
        for (Map.Entry<K, V> entry : self.entrySet()) {
            if (bcw.callForMap(entry)) {
                return entry;
            }
        }
        return null;
    }

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