DefaultEncodingDetector.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 org.apache.tika.detect;

import java.util.Collection;
import javax.imageio.spi.ServiceRegistry;

import org.apache.tika.config.ServiceLoader;

/**
 * A composite encoding detector over all {@link EncodingDetector}
 * implementations available through the
 * {@link ServiceRegistry service provider mechanism}.
 *
 * <p>The 4.x default chain (via {@code META-INF/services}): BOM and
 * metadata-charset detectors (tika-core), the HTML {@code <meta>} detector,
 * MojibusterEncodingDetector, and JunkFilterEncodingDetector ��� a
 * {@link MetaEncodingDetector} that arbitrates the candidates by decode quality
 * and always runs last, so detector order is irrelevant.</p>
 *
 * <p>UniversalEncodingDetector and Icu4jEncodingDetector are no longer
 * distributed by default and are not auto-discovered; add the jar and enable
 * them in a {@code tika-config} to use them.</p>
 *
 * @since Apache Tika 1.15
 */
public class DefaultEncodingDetector extends CompositeEncodingDetector {

    public DefaultEncodingDetector() {
        this(new ServiceLoader(DefaultEncodingDetector.class.getClassLoader()));
    }

    public DefaultEncodingDetector(ServiceLoader loader) {
        super(loader.loadServiceProviders(EncodingDetector.class));
    }

    public DefaultEncodingDetector(ServiceLoader loader,
                                   Collection<Class<? extends EncodingDetector>>
                                           excludeEncodingDetectors) {
        super(loader.loadServiceProviders(EncodingDetector.class),
                excludeEncodingDetectors);
    }
}