org.apache.pdfbox.pdmodel.interactive.annotation.PDAppearanceEntry Maven / Gradle / Ivy

Show more of this group Show more artifacts with this name
Show all versions of pdfbox Show documentation
The Apache PDFBox library is an open source Java tool for working with PDF documents.
There is a newer version: 3.0.2
/*
 * 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.interactive.annotation;

import java.util.HashMap;
import java.util.Map;
import org.apache.pdfbox.cos.COSBase;
import org.apache.pdfbox.cos.COSDictionary;
import org.apache.pdfbox.cos.COSName;
import org.apache.pdfbox.cos.COSStream;
import org.apache.pdfbox.pdmodel.common.COSDictionaryMap;
import org.apache.pdfbox.pdmodel.common.COSObjectable;

/**
 * An entry in an appearance dictionary. May contain either a single appearance stream or an appearance subdictionary.
 *
 * @author John Hewson
 */
public class PDAppearanceEntry implements COSObjectable
{
    private COSBase entry;

    private PDAppearanceEntry()
    {
    }

    /**
     * Constructor for reading.
     * 
     * @param entry
     */
    public PDAppearanceEntry(COSBase entry)
    {
        this.entry = entry;
    }

    @Override
    public COSBase getCOSObject()
    {
        return entry;
    }

    /**
     * Returns true if this entry is an appearance subdictionary.
     */
    public boolean isSubDictionary()
    {
        return !(this.entry instanceof COSStream);
    }

    /**
     * Returns true if this entry is an appearance stream.
     */
    public boolean isStream()
    {
        return this.entry instanceof COSStream;
    }

    /**
     * Returns the entry as an appearance stream.
     *
     * @throws IllegalStateException if this entry is not an appearance stream
     */
    public PDAppearanceStream getAppearanceStream()
    {
        if (!isStream())
        {
            throw new IllegalStateException();
        }
        return new PDAppearanceStream((COSStream) entry);
    }

    /**
     * Returns the entry as an appearance subdictionary.
     *
     * @throws IllegalStateException if this entry is not an appearance subdictionary
     */
    public Map getSubDictionary()
    {
        if (!isSubDictionary())
        {
            throw new IllegalStateException();
        }

        COSDictionary dict = (COSDictionary) entry;
        Map map = new HashMap();

        for (COSName name : dict.keySet())
        {
            COSBase value = dict.getDictionaryObject(name);

            // the file from PDFBOX-1599 contains /null as its entry, so we skip non-stream entries
            if (value instanceof COSStream)
            {
                map.put(name, new PDAppearanceStream((COSStream) value));
            }
        }

        return new COSDictionaryMap(map, dict);
    }
}