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 * by the @authors tag. See the copyright.txt in the distribution for a
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 *
 * This software is distributed in the hope that it will be useful,
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 * Lesser General Public License for more details.
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package org.richfaces.tests.metamer.ftest.extension.finder;

import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.util.Collection;
import java.util.List;
import java.util.Set;

import org.richfaces.tests.metamer.ftest.extension.finder.MethodFinder.Finder;
import org.testng.collections.Sets;

import com.google.common.base.Predicate;
import com.google.common.collect.Iterables;
import com.google.common.collect.Lists;

public class SimpleMethodFinder implements MethodFinder, Finder {

    private Collection<Class<?>> classes;
    private final List<Predicate<Method>> filters = Lists.newArrayList();
    private final Set<Method> foundMethods = Sets.newHashSet();

    @Override
    public Finder findAllMethodsFrom(Collection<Class<?>> classes) {
        this.classes = classes;
        return this;
    }

    private List<Method> getAndFilterMethods() {
        for (Class<?> klass : classes) {
            foundMethods.addAll(Lists.newArrayList(klass.getDeclaredMethods()));
        }
        Iterable<Method> result = foundMethods;
        for (Predicate<Method> filter : filters) {
            result = Iterables.filter(result, filter);
        }
        return Lists.newArrayList(result);
    }

    @Override
    public Set<Method> scan() {
        return Sets.newHashSet(getAndFilterMethods());
    }

    @Override
    public Finder withAnnotation(final Class<? extends Annotation> annotationClass) {
        filters.add(new Predicate<Method>() {
            @Override
            public boolean apply(Method t) {
                return t.getAnnotation(annotationClass) != null;
            }
        });
        return this;
    }

    @Override
    public Finder withNameMatching(final String match) {
        filters.add(new Predicate<Method>() {
            @Override
            public boolean apply(Method t) {
                return t.getName().matches(match);
            }
        });
        return this;
    }

}