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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2013-2014 sagyf Yang. The Four Group.
 */

package goja.core.libs;

import goja.core.libs.base.Option;

/**
 *  . 
 *
 * @author sagyf yang
 * @version 1.0 2014-09-11 13:36
 * @since JDK 1.6
 */
public abstract class Matcher {

    public static Matcher String = new Matcher() {

        @Override
        public Option match(Object o) {
            if (o instanceof String) {
                return Option.Some((String) o);
            }
            return Option.None();
        }
    };

    public static  Matcher ClassOf(final Class clazz) {
        return new Matcher() {

            @Override
            public Option match(Object o) {
                if (o instanceof Option && ((Option) o).isDefined()) {
                    o = ((Option) o).get();
                }
                if (clazz.isInstance(o)) {
                    return Option.Some((K) o);
                }
                return Option.None();
            }
        };
    }

    public static Matcher StartsWith(final String prefix) {
        return new Matcher() {

            @Override
            public Option match(String o) {
                if (o.startsWith(prefix)) {
                    return Option.Some(o);
                }
                return Option.None();
            }
        };
    }

    public static Matcher Re(final String pattern) {
        return new Matcher() {

            @Override
            public Option match(String o) {
                if (o.matches(pattern)) {
                    return Option.Some(o);
                }
                return Option.None();
            }
        };
    }

    public static  Matcher Equals(final X other) {
        return new Matcher() {

            @Override
            public Option match(X o) {
                if (o.equals(other)) {
                    return Option.Some(o);
                }
                return Option.None();
            }
        };
    }

    public abstract Option match(T o);

    public Option match(Option o) {
        if (o.isDefined()) {
            return match(o.get());
        }
        return Option.None();
    }

    public  Matcher and(final Matcher nextMatcher) {
        final Matcher firstMatcher = this;
        return new Matcher() {

            @Override
            public Option match(T o) {
                for (R r : firstMatcher.match(o)) {
                    return nextMatcher.match(r);
                }
                return Option.None();
            }
        };
    }
}