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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.parser.image;
import java.io.IOException;
import java.io.InputStream;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;
import javax.imageio.IIOException;
import javax.imageio.ImageIO;
import javax.imageio.ImageReader;
import javax.imageio.metadata.IIOMetadata;
import org.apache.tika.exception.TikaException;
import org.apache.tika.io.CloseShieldInputStream;
import org.apache.tika.metadata.Metadata;
import org.apache.tika.metadata.Property;
import org.apache.tika.mime.MediaType;
import org.apache.tika.parser.ParseContext;
import org.apache.tika.parser.Parser;
import org.apache.tika.sax.XHTMLContentHandler;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.xml.sax.ContentHandler;
import org.xml.sax.SAXException;
public class ImageParser implements Parser {
private static final Set SUPPORTED_TYPES =
Collections.unmodifiableSet(new HashSet(Arrays.asList(
MediaType.image("bmp"),
MediaType.image("gif"),
MediaType.image("png"),
MediaType.image("vnd.wap.wbmp"),
MediaType.image("x-icon"),
MediaType.image("x-psd"),
MediaType.image("x-xcf"))));
public Set getSupportedTypes(ParseContext context) {
return SUPPORTED_TYPES;
}
public void parse(
InputStream stream, ContentHandler handler,
Metadata metadata, ParseContext context)
throws IOException, SAXException, TikaException {
String type = metadata.get(Metadata.CONTENT_TYPE);
if (type != null) {
try {
Iterator iterator =
ImageIO.getImageReadersByMIMEType(type);
if (iterator.hasNext()) {
ImageReader reader = iterator.next();
reader.setInput(ImageIO.createImageInputStream(
new CloseShieldInputStream(stream)));
metadata.set(Metadata.IMAGE_WIDTH, Integer.toString(reader.getWidth(0)));
metadata.set(Metadata.IMAGE_LENGTH, Integer.toString(reader.getHeight(0)));
metadata.set("height", Integer.toString(reader.getHeight(0)));
metadata.set("width", Integer.toString(reader.getWidth(0)));
loadMetadata(reader.getImageMetadata(0), metadata);
reader.dispose();
}
// Translate certain Metadata tags from the ImageIO
// specific namespace into the general Tika one
setIfPresent(metadata, "CommentExtensions CommentExtension", Metadata.COMMENTS);
setIfPresent(metadata, "markerSequence com", Metadata.COMMENTS);
setIfPresent(metadata, "Data BitsPerSample", Metadata.BITS_PER_SAMPLE);
} catch (IIOException e) {
throw new TikaException(type + " parse error", e);
}
}
XHTMLContentHandler xhtml = new XHTMLContentHandler(handler, metadata);
xhtml.startDocument();
xhtml.endDocument();
}
/**
* @deprecated This method will be removed in Apache Tika 1.0.
*/
public void parse(
InputStream stream, ContentHandler handler, Metadata metadata)
throws IOException, SAXException, TikaException {
parse(stream, handler, metadata, new ParseContext());
}
private static void setIfPresent(Metadata metadata, String imageIOkey, String tikaKey) {
if(metadata.get(imageIOkey) != null) {
metadata.set(tikaKey, metadata.get(imageIOkey));
}
}
private static void setIfPresent(Metadata metadata, String imageIOkey, Property tikaProp) {
if(metadata.get(imageIOkey) != null) {
String v = metadata.get(imageIOkey);
if(v.endsWith(" ")) {
v = v.substring(0, v.lastIndexOf(' '));
}
metadata.set(tikaProp, v);
}
}
private static void loadMetadata(IIOMetadata imageMetadata, Metadata metadata) {
String[] names = imageMetadata.getMetadataFormatNames();
if (names == null) {
return;
}
int length = names.length;
for (int i = 0; i < length; i++) {
loadNode(metadata, imageMetadata.getAsTree(names[i]), "", false);
}
}
private static void loadNode(
Metadata metadata, Node node, String parents,
boolean addThisNodeName) {
if (addThisNodeName) {
if (parents.length() > 0) {
parents += " ";
}
parents += node.getNodeName();
}
NamedNodeMap map = node.getAttributes();
if (map != null) {
int length = map.getLength();
if (length == 1) {
metadata.add(parents, map.item(0).getNodeValue());
} else if (length > 1) {
StringBuffer value = new StringBuffer();
for (int i = 0; i < length; i++) {
if (i > 0) {
value.append(", ");
}
Node attr = map.item(i);
value.append(attr.getNodeName()).append("=").append(attr.getNodeValue());
}
metadata.add(parents, value.toString());
}
}
Node child = node.getFirstChild();
while (child != null) {
// print children recursively
loadNode(metadata, child, parents, true);
child = child.getNextSibling();
}
}
}
