org.apache.tika.parser.external.ExternalParsersConfigReader Maven / Gradle / Ivy
/*
* 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.parser.external;
import javax.xml.parsers.DocumentBuilder;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.StringTokenizer;
import java.util.regex.Pattern;
import org.apache.tika.exception.TikaException;
import org.apache.tika.mime.MediaType;
import org.apache.tika.mime.MimeTypeException;
import org.apache.tika.parser.ParseContext;
import org.apache.tika.utils.XMLReaderUtils;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
/**
* Builds up ExternalParser instances based on XML file(s)
* which define what to run, for what, and how to process
* any output metadata.
* Typically used to configure up a series of external programs
* (like catdoc or pdf2txt) to extract text content from documents.
*
*
* TODO XML DTD Here
*
*/
public final class ExternalParsersConfigReader implements ExternalParsersConfigReaderMetKeys {
public static List read(InputStream stream) throws TikaException, IOException {
try {
DocumentBuilder builder = XMLReaderUtils.getDocumentBuilder();
Document document = builder.parse(new InputSource(stream));
return read(document);
} catch (SAXException e) {
throw new TikaException("Invalid parser configuration", e);
}
}
public static List read(Document document) throws TikaException, IOException {
return read(document.getDocumentElement());
}
public static List read(Element element) throws TikaException, IOException {
List parsers = new ArrayList();
if (element != null && element.getTagName().equals(EXTERNAL_PARSERS_TAG)) {
NodeList nodes = element.getChildNodes();
for (int i = 0; i < nodes.getLength(); i++) {
Node node = nodes.item(i);
if (node.getNodeType() == Node.ELEMENT_NODE) {
Element child = (Element) node;
if (child.getTagName().equals(PARSER_TAG)) {
ExternalParser p = readParser(child);
if(p != null) {
parsers.add( p );
}
}
}
}
} else {
throw new MimeTypeException(
"Not a <" + EXTERNAL_PARSERS_TAG + "/> configuration document: "
+ element.getTagName());
}
return parsers;
}
/**
* Builds and Returns an ExternalParser, or null if a check
* command was given that didn't match.
*/
private static ExternalParser readParser(Element parserDef) throws TikaException {
ExternalParser parser = new ExternalParser();
NodeList children = parserDef.getChildNodes();
for(int i=0; i readMimeTypes(Element mimeTypes) {
Set types = new HashSet();
NodeList children = mimeTypes.getChildNodes();
for(int i=0; i readMetadataPatterns(Element metadataDef) {
Map metadata = new HashMap();
NodeList children = metadataDef.getChildNodes();
for(int i=0; i errorVals = new ArrayList();
NodeList children = checkDef.getChildNodes();
for(int i=0; i