org.apache.pdfbox.pdmodel.fdf.FDFAnnotationInk Maven / Gradle / Ivy
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The Apache PDFBox library is an open source Java tool for working with PDF documents.
/*
* 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.pdfbox.pdmodel.fdf;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.xpath.XPathFactory;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.pdfbox.cos.COSArray;
import org.apache.pdfbox.cos.COSBase;
import org.apache.pdfbox.cos.COSDictionary;
import org.apache.pdfbox.cos.COSName;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
/**
* This represents a Ink FDF annotation.
*
* @author Ben Litchfield
*/
public class FDFAnnotationInk extends FDFAnnotation
{
private static final Log LOG = LogFactory.getLog(FDFAnnotationInk.class);
/**
* COS Model value for SubType entry.
*/
public static final String SUBTYPE = "Ink";
/**
* Default constructor.
*/
public FDFAnnotationInk()
{
super();
annot.setName(COSName.SUBTYPE, SUBTYPE);
}
/**
* Constructor.
*
* @param a An existing FDF Annotation.
*/
public FDFAnnotationInk(COSDictionary a)
{
super(a);
}
/**
* Constructor.
*
* @param element An XFDF element.
*
* @throws IOException If there is an error extracting information from the element.
*/
public FDFAnnotationInk(Element element) throws IOException
{
super(element);
annot.setName(COSName.SUBTYPE, SUBTYPE);
XPath xpath = XPathFactory.newInstance().newXPath();
try
{
NodeList gestures = (NodeList) xpath.evaluate("inklist/gesture", element,
XPathConstants.NODESET);
if (gestures.getLength() == 0)
{
throw new IOException("Error: missing element 'gesture'");
}
List inklist = new ArrayList();
for (int i = 0; i < gestures.getLength(); i++)
{
Node node = gestures.item(i);
if (node instanceof Element)
{
String gesture = node.getFirstChild().getNodeValue();
String[] gestureValues = gesture.split(",|;");
float[] values = new float[gestureValues.length];
for (int j = 0; j < gestureValues.length; j++)
{
values[j] = Float.parseFloat(gestureValues[j]);
}
inklist.add(values);
}
}
setInkList(inklist);
}
catch (XPathExpressionException e)
{
LOG.debug("Error while evaluating XPath expression for inklist gestures");
}
}
/**
* Set the paths making up the freehand "scribble".
*
* The ink annotation is made up of one ore more disjoint paths. Each array entry is an array representing a stroked
* path, being a series of alternating horizontal and vertical coordinates in default user space.
*
* @param inklist the List of arrays representing the paths.
*/
public final void setInkList(List inklist)
{
COSArray newInklist = new COSArray();
for (float[] array : inklist)
{
COSArray newArray = new COSArray();
newArray.setFloatArray(array);
newInklist.add(newArray);
}
annot.setItem(COSName.INKLIST, newInklist);
}
/**
* Get the paths making up the freehand "scribble".
*
* @see #setInkList(List)
* @return the List of arrays representing the paths.
*/
public List getInkList()
{
COSArray array = (COSArray) annot.getDictionaryObject(COSName.INKLIST);
if (array != null)
{
List retval = new ArrayList();
for (COSBase entry : array)
{
retval.add(((COSArray) entry).toFloatArray());
}
return retval;
}
else
{
return null; // Should never happen as this is a required item
}
}
}