org.apache.tika.parser.xml.AbstractMetadataHandler 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.xml;
import java.util.Arrays;
import java.util.List;
import org.apache.tika.metadata.Metadata;
import org.apache.tika.metadata.Property;
import org.xml.sax.helpers.DefaultHandler;
/**
* Base class for SAX handlers that map SAX events into document metadata.
*
* @since Apache Tika 0.10
*/
class AbstractMetadataHandler extends DefaultHandler {
private final Metadata metadata;
private final Property property;
private final String name;
protected AbstractMetadataHandler(Metadata metadata, String name) {
this.metadata = metadata;
this.property = null;
this.name = name;
}
protected AbstractMetadataHandler(Metadata metadata, Property property) {
this.metadata = metadata;
this.property = property;
this.name = property.getName();
}
/**
* Adds the given metadata value. The value is ignored if it is
* null or empty. If the metadata entry already exists,
* then the given value is appended to it with a comma as the separator.
*
* @param value metadata value
*/
protected void addMetadata(String value) {
if (value != null && value.length() > 0) {
if (metadata.isMultiValued(name)) {
// Add the value, assuming it's not already there
List previous = Arrays.asList(metadata.getValues(name));
if (!previous.contains(value)) {
if (property != null) {
metadata.add(property, value);
} else {
metadata.add(name, value);
}
}
} else {
// Set the value, assuming it's not already there
String previous = metadata.get(name);
if (previous != null && previous.length() > 0) {
if (!previous.equals(value)) {
if (property != null) {
if (property.isMultiValuePermitted()) {
metadata.add(property, value);
} else {
// Replace the existing value if isMultiValuePermitted is false
metadata.set(property, value);
}
} else {
metadata.add(name, value);
}
}
} else {
if (property != null) {
metadata.set(property, value);
} else {
metadata.set(name, value);
}
}
}
}
}
}