# PDPropertyList.java

    /*
     * 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.documentinterchange.markedcontent;

    import org.apache.pdfbox.cos.COSBase;
    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.optionalcontent.PDOptionalContentGroup;
    import org.apache.pdfbox.pdmodel.graphics.optionalcontent.PDOptionalContentMembershipDictionary;

    /**
     * A property list is a dictionary containing private information meaningful to the conforming
     * writer creating the marked content.
     */
    public class PDPropertyList implements COSObjectable
    {
        protected final COSDictionary dict;

        /**
         * Creates a property list from the given dictionary.
         * @param dict COS dictionary
         */
        public static PDPropertyList create(COSDictionary dict)
        {
            COSBase item = dict.getItem(COSName.TYPE);
            if (COSName.OCG.equals(item))
            {
                return new PDOptionalContentGroup(dict);
            }
            else if (COSName.OCMD.equals(item))
            {
                return new PDOptionalContentMembershipDictionary(dict);
            }
            else
            {
                // todo: more types
                return new PDPropertyList(dict);
            }
        }

        /**
         * Constructor for subclasses.
         */
        protected PDPropertyList()
        {
            this.dict = new COSDictionary();
        }

        /**
         * Constructor for subclasses.
         */
        protected PDPropertyList(COSDictionary dict)
        {
            this.dict = dict;
        }

        @Override
        public COSDictionary getCOSObject()
        {
            return dict;
        }
    }