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/*
* Copyright 1999-2004 The Apache Software Foundation.
*
* Licensed 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.
*/
/* $Id$ */
package org.apache.fop.image.analyser;
// Java
import java.io.InputStream;
import java.io.IOException;
import java.util.Map;
// XML
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
// FOP
import org.apache.fop.image.FopImage;
import org.apache.fop.apps.FOUserAgent;
/** ImageReader object for XML document image type. */
public class XMLReader implements ImageReader {
private static Map converters = new java.util.HashMap();
/**
* Registers a Converter implementation with XMLReader.
*
* @param ns The namespace to associate with this converter
* @param conv The actual Converter implementation
*/
public static void setConverter(String ns, Converter conv) {
converters.put(ns, conv);
}
/** @see org.apache.fop.image.analyser.ImageReader */
public FopImage.ImageInfo verifySignature(String uri, InputStream fis,
FOUserAgent ua)
throws IOException {
FopImage.ImageInfo info = loadImage(uri, fis, ua);
if (info != null) {
try {
fis.close();
} catch (Exception e) {
//ignore
}
}
return info;
}
/**
* Returns the MIME type supported by this implementation.
*
* @return The MIME type
*/
public String getMimeType() {
return "text/xml";
}
/**
* Creates an ImageInfo object from an XML image read from a stream.
*
* (todo) This means the external svg document will be loaded twice. Possibly need
* a slightly different design for the image stuff.
*
* @param uri The URI to the image
* @param bis The InputStream
* @param ua The user agent
* @return An ImageInfo object describing the image
*/
protected FopImage.ImageInfo loadImage(String uri, InputStream bis,
FOUserAgent ua) {
return createDocument(bis, ua);
}
/**
* Creates an ImageInfo object from an XML image read from a stream.
*
* @param is The InputStream
* @param ua The user agent
* @return An ImageInfo object describing the image
*/
public FopImage.ImageInfo createDocument(InputStream is, FOUserAgent ua) {
Document doc = null;
FopImage.ImageInfo info = new FopImage.ImageInfo();
info.mimeType = getMimeType();
try {
int length = is.available();
is.mark(length);
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
doc = dbf.newDocumentBuilder().parse(is);
info.data = doc;
Element root = doc.getDocumentElement();
ua.getLogger().debug("XML image namespace: " + root.getAttribute("xmlns"));
String ns = root.getAttribute("xmlns");
info.str = ns;
Converter conv = (Converter) converters.get(ns);
if (conv != null) {
FopImage.ImageInfo i = conv.convert(doc);
if (i != null) {
info = i;
}
}
} catch (Exception e) {
ua.getLogger().warn("Error while constructing image from XML", e);
try {
is.reset();
} catch (IOException ioe) {
// throw the original exception, not this one
}
return null;
}
return info;
}
/**
* This interface is to be implemented for XML to image converters.
*/
public static interface Converter {
/**
* This method is called for a DOM document to be converted into an
* ImageInfo object.
*
* @param doc The DOM document to convert
* @return An ImageInfo object describing the image
*/
FopImage.ImageInfo convert(Document doc);
}
}
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