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/*
 * 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 org.apache.tika.detect;

import java.util.List;

import org.apache.tika.config.ServiceLoader;
import org.apache.tika.mime.MimeTypes;
import org.apache.tika.mime.ProbabilisticMimeDetectionSelector;
import org.apache.tika.utils.ServiceLoaderUtils;

/**
 * A version of {@link DefaultDetector} for probabilistic mime
 *  detectors, which use statistical techniques to blend the
 *  results of differing underlying detectors when attempting
 *  to detect the type of a given file.
 * TODO Link to documentation on configuring these probabilities
 */
public class DefaultProbDetector extends CompositeDetector {
    private static final long serialVersionUID = -8836240060532323352L;

    private static List getDefaultDetectors(
            ProbabilisticMimeDetectionSelector sel, ServiceLoader loader) {
        List detectors = loader.loadStaticServiceProviders(Detector.class);
        ServiceLoaderUtils.sortLoadedClasses(detectors);
        detectors.add(sel);
        return detectors;
    }

    private transient final ServiceLoader loader;

    public DefaultProbDetector(ProbabilisticMimeDetectionSelector sel,
            ServiceLoader loader) {
        super(sel.getMediaTypeRegistry(), getDefaultDetectors(sel, loader));
        this.loader = loader;
    }

    public DefaultProbDetector(ProbabilisticMimeDetectionSelector sel,
            ClassLoader loader) {
        this(sel, new ServiceLoader(loader));
    }

    public DefaultProbDetector(ClassLoader loader) {
        this(new ProbabilisticMimeDetectionSelector(), loader);
    }

    public DefaultProbDetector(MimeTypes types) {
        this(new ProbabilisticMimeDetectionSelector(types), new ServiceLoader());
    }

    public DefaultProbDetector() {
        this(MimeTypes.getDefaultMimeTypes());
    }

    @Override
    public List getDetectors() {
        if (loader != null) {
            List detectors = loader
                    .loadDynamicServiceProviders(Detector.class);
            detectors.addAll(super.getDetectors());
            return detectors;
        } else {
            return super.getDetectors();
        }
    }
}