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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.contentstream.operator.state;
import java.util.List;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.pdfbox.contentstream.operator.MissingOperandException;
import org.apache.pdfbox.contentstream.operator.Operator;
import org.apache.pdfbox.contentstream.operator.OperatorProcessor;
import org.apache.pdfbox.cos.COSArray;
import org.apache.pdfbox.cos.COSBase;
import org.apache.pdfbox.cos.COSNumber;
/**
* d: Set the line dash pattern.
*
* @author Ben Litchfield
*/
public class SetLineDashPattern extends OperatorProcessor
{
private static final Log LOG = LogFactory.getLog(SetLineDashPattern.class);
@Override
public void process(Operator operator, List arguments) throws MissingOperandException
{
if (arguments.size() < 2)
{
throw new MissingOperandException(operator, arguments);
}
COSBase base0 = arguments.get(0);
if (!(base0 instanceof COSArray))
{
return;
}
COSBase base1 = arguments.get(1);
if (!(base1 instanceof COSNumber))
{
return;
}
COSArray dashArray = (COSArray) base0;
int dashPhase = ((COSNumber) base1).intValue();
boolean allZero = true;
for (COSBase base : dashArray)
{
if (base instanceof COSNumber)
{
COSNumber num = (COSNumber) base;
if (num.floatValue() != 0)
{
allZero = false;
break;
}
}
else
{
LOG.warn("dash array has non number element " + base + ", ignored");
dashArray = new COSArray();
break;
}
}
if (dashArray.size() > 0 && allZero)
{
LOG.warn("dash lengths all zero, ignored");
dashArray = new COSArray();
}
context.setLineDashPattern(dashArray, dashPhase);
}
@Override
public String getName()
{
return "d";
}
}