/*
* Copyright 2014 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.
*/
package org.apache.pdfbox.util;
import java.io.StringWriter;
import javax.imageio.metadata.IIOMetadata;
import javax.imageio.metadata.IIOMetadataNode;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
*
* @author Tilman Hausherr
*/
public class MetaUtil
{
private static final Log LOG = LogFactory.getLog(TIFFUtil.class);
static final String SUN_TIFF_FORMAT = "com_sun_media_imageio_plugins_tiff_image_1.0";
static final String JPEG_NATIVE_FORMAT = "javax_imageio_jpeg_image_1.0";
static final String STANDARD_METADATA_FORMAT = "javax_imageio_1.0";
// logs metadata as an XML tree if debug is enabled
static void debugLogMetadata(IIOMetadata metadata, String format)
{
if (LOG.isDebugEnabled())
{
return;
}
// see http://docs.oracle.com/javase/7/docs/api/javax/imageio/
// metadata/doc-files/standard_metadata.html
IIOMetadataNode root = (IIOMetadataNode) metadata.getAsTree(format);
try
{
StringWriter xmlStringWriter = new StringWriter();
StreamResult streamResult = new StreamResult(xmlStringWriter);
Transformer transformer = TransformerFactory.newInstance().newTransformer();
// see http://stackoverflow.com/a/1264872/535646
transformer.setOutputProperty(OutputKeys.INDENT, "yes");
transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "2");
DOMSource domSource = new DOMSource(root);
transformer.transform(domSource, streamResult);
LOG.debug("\n" + xmlStringWriter);
}
catch (IllegalArgumentException ex)
{
LOG.error(ex, ex);
}
catch (TransformerException ex)
{
LOG.error(ex, ex);
}
}
}