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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.graphics.color;
import java.awt.image.BufferedImage;
import java.awt.image.WritableRaster;
import java.io.IOException;
import org.apache.pdfbox.cos.COSArray;
import org.apache.pdfbox.cos.COSName;
import org.apache.pdfbox.pdmodel.PDResources;
import org.apache.pdfbox.pdmodel.graphics.pattern.PDAbstractPattern;
/**
* A Pattern color space is either a Tiling pattern or a Shading pattern.
* @author John Hewson
* @author Ben Litchfield
*/
public final class PDPattern extends PDSpecialColorSpace
{
/** A pattern which leaves no marks on the page. */
private static PDColor EMPTY_PATTERN = new PDColor(new float[] { }, null);
private final PDResources resources;
private PDColorSpace underlyingColorSpace;
/**
* Creates a new pattern color space.
*
* @param resources The current resources.
*/
public PDPattern(PDResources resources)
{
this.resources = resources;
array = new COSArray();
array.add(COSName.PATTERN);
}
/**
* Creates a new uncolored tiling pattern color space.
*
* @param resources The current resources.
* @param colorSpace The underlying color space.
*/
public PDPattern(PDResources resources, PDColorSpace colorSpace)
{
this.resources = resources;
this.underlyingColorSpace = colorSpace;
array = new COSArray();
array.add(COSName.PATTERN);
array.add(colorSpace);
}
@Override
public String getName()
{
return COSName.PATTERN.getName();
}
@Override
public int getNumberOfComponents()
{
throw new UnsupportedOperationException();
}
@Override
public float[] getDefaultDecode(int bitsPerComponent)
{
throw new UnsupportedOperationException();
}
@Override
public PDColor getInitialColor()
{
return EMPTY_PATTERN;
}
@Override
public float[] toRGB(float[] value)
{
throw new UnsupportedOperationException();
}
@Override
public BufferedImage toRGBImage(WritableRaster raster) throws IOException
{
throw new UnsupportedOperationException();
}
/**
* Returns the pattern for the given color.
*
* @param color color containing a pattern name
* @return pattern for the given color
* @throws java.io.IOException if the pattern name was not found.
*/
public PDAbstractPattern getPattern(PDColor color) throws IOException
{
PDAbstractPattern pattern = resources.getPattern(color.getPatternName());
if (pattern == null)
{
throw new IOException("pattern " + color.getPatternName() + " was not found");
}
else
{
return pattern;
}
}
/**
* Returns the underlying color space, if this is an uncolored tiling pattern, otherwise null.
*/
public PDColorSpace getUnderlyingColorSpace()
{
return underlyingColorSpace;
}
@Override
public String toString()
{
return "Pattern";
}
}