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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.form;
import java.io.IOException;
import org.apache.pdfbox.cos.COSDictionary;
import org.apache.pdfbox.cos.COSName;
import org.apache.pdfbox.pdmodel.common.COSObjectable;
import org.apache.pdfbox.pdmodel.graphics.color.PDColorSpace;
/**
* Transparency group attributes.
*
* @author Kühn & Weyh Software GmbH
*/
public final class PDTransparencyGroupAttributes implements COSObjectable
{
private final COSDictionary dictionary;
private PDColorSpace colorSpace;
/**
* Creates a group object with /Transparency subtype entry.
*/
public PDTransparencyGroupAttributes()
{
dictionary = new COSDictionary();
dictionary.setItem(COSName.S, COSName.TRANSPARENCY);
}
/**
* Creates a group object from a given dictionary
* @param dic {@link COSDictionary} object
*/
public PDTransparencyGroupAttributes(COSDictionary dic)
{
dictionary = dic;
}
@Override
public COSDictionary getCOSObject()
{
return dictionary;
}
/**
* Returns the group color space or null if it isn't defined.
*
* @return the group color space.
* @throws IOException
*/
public PDColorSpace getColorSpace() throws IOException
{
if (colorSpace == null && getCOSObject().containsKey(COSName.CS))
{
colorSpace = PDColorSpace.create(getCOSObject().getDictionaryObject(COSName.CS));
}
return colorSpace;
}
/**
* Returns true if this group is isolated. Isolated groups begin with the fully transparent
* image, non-isolated begin with the current backdrop.
*/
public boolean isIsolated()
{
return getCOSObject().getBoolean(COSName.I, false);
}
/**
* Returns true if this group is a knockout. A knockout group blends with original backdrop,
* a non-knockout group blends with the current backdrop.
*/
public boolean isKnockout()
{
return getCOSObject().getBoolean(COSName.K, false);
}
}