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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.
*/
/* $Id$ */
package org.apache.fop.fo.flow;
import java.io.IOException;
import org.xml.sax.Locator;
import org.apache.xmlgraphics.image.loader.ImageException;
import org.apache.xmlgraphics.image.loader.ImageInfo;
import org.apache.xmlgraphics.image.loader.ImageManager;
import org.apache.fop.apps.FOPException;
import org.apache.fop.apps.FOUserAgent;
import org.apache.fop.datatypes.Length;
import org.apache.fop.datatypes.URISpecification;
import org.apache.fop.fo.FONode;
import org.apache.fop.fo.PropertyList;
import org.apache.fop.fo.ValidationException;
import org.apache.fop.fo.properties.FixedLength;
/**
* Class modelling the fo:external-graphic object.
* This FO node handles the external graphic. It creates an image
* inline area that can be added to the area tree.
*/
public class ExternalGraphic extends AbstractGraphics {
// The value of properties relevant for fo:external-graphic.
// All but one of the e-g properties are kept in AbstractGraphics
private String src;
// End of property values
//Additional values
private String url;
private int intrinsicWidth;
private int intrinsicHeight;
private Length intrinsicAlignmentAdjust;
/**
* Create a new External graphic node.
*
* @param parent the parent of this node
*/
public ExternalGraphic(FONode parent) {
super(parent);
}
/**
* {@inheritDoc}
*/
public void bind(PropertyList pList) throws FOPException {
super.bind(pList);
src = pList.get(PR_SRC).getString();
//Additional processing: obtain the image's intrinsic size and baseline information
url = URISpecification.getURL(src);
FOUserAgent userAgent = getUserAgent();
ImageManager manager = userAgent.getFactory().getImageManager();
ImageInfo info = null;
try {
info = manager.getImageInfo(url, userAgent.getImageSessionContext());
} catch (ImageException e) {
log.error("Image not available: " + e.getMessage());
} catch (IOException ioe) {
log.error("I/O error while loading image: " + ioe.getMessage());
}
if (info != null) {
this.intrinsicWidth = info.getSize().getWidthMpt();
this.intrinsicHeight = info.getSize().getHeightMpt();
int baseline = info.getSize().getBaselinePositionFromBottom();
if (baseline != 0) {
this.intrinsicAlignmentAdjust = new FixedLength(-baseline);
}
}
//TODO Report to caller so he can decide to throw an exception
}
/**
* {@inheritDoc}
*/
protected void startOfNode() throws FOPException {
super.startOfNode();
getFOEventHandler().image(this);
}
/**
* {@inheritDoc}
* XSL Content Model: empty
*/
protected void validateChildNode(Locator loc, String nsURI, String localName)
throws ValidationException {
invalidChildError(loc, nsURI, localName);
}
/**
* @return the "src" property.
*/
public String getSrc() {
return src;
}
/**
* @return Get the resulting URL based on the src property.
*/
public String getURL() {
return url;
}
/** {@inheritDoc} */
public String getLocalName() {
return "external-graphic";
}
/**
* {@inheritDoc}
*/
public int getNameId() {
return FO_EXTERNAL_GRAPHIC;
}
/**
* {@inheritDoc}
*/
public int getIntrinsicWidth() {
return this.intrinsicWidth;
}
/**
* {@inheritDoc}
*/
public int getIntrinsicHeight() {
return this.intrinsicHeight;
}
/**
* {@inheritDoc}
*/
public Length getIntrinsicAlignmentAdjust() {
return this.intrinsicAlignmentAdjust;
}
}
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