de.devsurf.injection.guice.scanner.reflections.ReflectionsScanner Maven / Gradle / Ivy

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/**
 * Copyright (C) 2010 Daniel Manzke 
 *
 * Licensed 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 de.devsurf.injection.guice.scanner.reflections;

import java.io.IOException;
import java.net.URL;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.LinkedHashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.regex.Pattern;

import javassist.bytecode.AnnotationsAttribute;
import javassist.bytecode.ClassFile;
import javassist.bytecode.annotation.Annotation;

import org.reflections.Reflections;
import org.reflections.scanners.AbstractScanner;
import org.reflections.util.ClasspathHelper;
import org.reflections.util.ConfigurationBuilder;

import com.google.common.base.Predicate;
import com.google.inject.Inject;
import com.google.inject.name.Named;

import de.devsurf.injection.guice.scanner.AnnotationListener;
import de.devsurf.injection.guice.scanner.ClasspathScanner;

/**
 * {@link ClasspathScanner} Implementation which uses the Reflections-API. This
 * Implementation scans all passed packages multithreaded.
 * 
 * @author Daniel Manzke
 * 
 */
public class ReflectionsScanner implements ClasspathScanner {
    private Logger _logger = Logger.getLogger(ReflectionsScanner.class.getName());
    private LinkedList _listeners;
    private LinkedList packagePatterns;
    private String[] _packages;

    @Inject
    public ReflectionsScanner(Set listeners,
	    @Named("packages") String... packages) {
	_listeners = new LinkedList(listeners);
	_packages = packages;
	this.packagePatterns = new LinkedList();
	for (String p : packages) {
	    includePackage(p);
	}
    }

    @Override
    public void addAnnotationListener(AnnotationListener listener) {
	_listeners.add(listener);
    }

    @Override
    public void removeAnnotationListener(AnnotationListener listener) {
	_listeners.remove(listener);
    }

    @Override
    public List getAnnotationListeners() {
	return new ArrayList(_listeners);
    }

    @Override
    public void excludePackage(String packageName) {
    }

    @Override
    public void includePackage(final String packageName) {
	String pattern = ".*" + packageName.replace(".", "\\.") + ".*";
	if(_logger.isLoggable(Level.FINE)){
	    _logger.fine("Including Package for scanning: "+packageName+" generating Pattern: "+pattern);
	}
	packagePatterns.add(Pattern.compile(pattern));
    }

    @Override
    public void scan() throws IOException {
	Set urls = new LinkedHashSet();
	for (String p : _packages) {
	    urls.addAll(ClasspathHelper.getUrlsForPackagePrefix(p));
	}
	new Reflections(new ConfigurationBuilder().setScanners(new AnnotationScanner())
	    .filterInputsBy(new Predicate() {
		@Override
		public boolean apply(String input) {
		    return matches(input);
		}
	    }).setUrls(urls).useParallelExecutor());
    }

    private boolean matches(String name) {
	for (Pattern pattern : packagePatterns) {
	    if (pattern.matcher(name).matches()) {
		return true;
	    }
	}
	return false;
    }

    private class AnnotationScanner extends AbstractScanner {
	@SuppressWarnings("unchecked")
	public void scan(final Object cls) {
	    ClassFile classFile = (ClassFile) cls;
	    AnnotationsAttribute annotationsAttribute = (AnnotationsAttribute) classFile
		.getAttribute(AnnotationsAttribute.visibleTag);
	    if (annotationsAttribute == null) {
		return;
	    }

	    Class