1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * The ASF licenses this file to You under the Apache License, Version 2.0 6 * (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 package org.apache.tika.detect; 18 19 import java.io.IOException; 20 import java.io.InputStream; 21 import java.util.List; 22 23 import org.apache.tika.metadata.Metadata; 24 import org.apache.tika.mime.MediaType; 25 26 /** 27 * Content type detector that combines multiple different detection mechanisms. 28 */ 29 public class CompositeDetector implements Detector { 30 31 private final List<Detector> detectors; 32 33 public CompositeDetector(List<Detector> detectors) { 34 this.detectors = detectors; 35 } 36 37 public MediaType detect(InputStream input, Metadata metadata) 38 throws IOException { 39 MediaType type = MediaType.OCTET_STREAM; 40 for (Detector detector : detectors) { 41 MediaType detected = detector.detect(input, metadata); 42 if (detected.isSpecializationOf(type)) { 43 type = detected; 44 } 45 } 46 return type; 47 } 48 49 }