DefaultC10NInterfaceSearch.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you under the Apache License, Version 2.0 (the
 *  "License"); you may not use this file except in compliance
 *  with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing,
 *  software distributed under the License is distributed on an
 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 *  KIND, either express or implied.  See the License for the
 *  specific language governing permissions and limitations
 *  under the License.
 */

package com.github.rodionmoiseev.c10n.tools.search;

import com.google.common.base.Function;
import com.google.common.collect.Iterables;
import com.google.common.collect.Sets;
import org.reflections.Reflections;
import org.reflections.util.ClasspathHelper;
import org.reflections.util.ConfigurationBuilder;
import org.reflections.util.FilterBuilder;

import java.lang.annotation.Annotation;
import java.net.URL;
import java.util.Arrays;
import java.util.Set;

class DefaultC10NInterfaceSearch implements C10NInterfaceSearch {
    @Override
    public Set<Class<?>> find(Class<? extends Annotation> annotationClass, String... packagePrefixes) {
        return new Reflections(new ConfigurationBuilder()
                .filterInputsBy(getPackageInputFilter(packagePrefixes))
                .setUrls(getPackageURLs(packagePrefixes)))
                .getTypesAnnotatedWith(annotationClass);
    }


    private Set<URL> getPackageURLs(String... packagePrefixes) {
        Iterable<URL> packages = Iterables.concat(Iterables.transform(
                Arrays.asList(packagePrefixes), new Function<String, Set<URL>>() {
            @Override
            public Set<URL> apply(String prefix) {
                return ClasspathHelper.forPackage(prefix);
            }
        }));

        return Sets.newHashSet(packages);
    }

    private FilterBuilder getPackageInputFilter(String... packagePrefixes) {
        final FilterBuilder inputFilter = new FilterBuilder();

        for (String prefix : packagePrefixes) {
            inputFilter.include(FilterBuilder.prefix(prefix));
        }

        return inputFilter;
    }
}