# DrawObject.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.contentstream.operator;

    import java.io.IOException;
    import java.util.List;
    import org.apache.commons.logging.Log;
    import org.apache.commons.logging.LogFactory;

    import org.apache.pdfbox.cos.COSBase;
    import org.apache.pdfbox.cos.COSName;
    import org.apache.pdfbox.pdmodel.graphics.PDXObject;
    import org.apache.pdfbox.pdmodel.graphics.form.PDFormXObject;
    import org.apache.pdfbox.pdmodel.graphics.form.PDTransparencyGroup;

    /**
     * Do: Draws an XObject.
     *
     * @author Ben Litchfield
     * @author Mario Ivankovits
     */
    public class DrawObject extends OperatorProcessor
    {
        private static final Log LOG = LogFactory.getLog(DrawObject.class);

        @Override
        public void process(Operator operator, List<COSBase> arguments) throws IOException
        {
            if (arguments.isEmpty())
            {
                throw new MissingOperandException(operator, arguments);
            }
            COSBase base0 = arguments.get(0);
            if (!(base0 instanceof COSName))
            {
                return;
            }
            COSName name = (COSName) base0;

            if (context.getResources().isImageXObject(name))
            {
                // we're done here, don't decode images when doing text extraction
                return;
            }

            PDXObject xobject = context.getResources().getXObject(name);

            if (xobject instanceof PDFormXObject)
            {
                try
                {
                    context.increaseLevel();
                    if (context.getLevel() > 50)
                    {
                        LOG.error("recursion is too deep, skipping form XObject");
                        return;
                    }
                    if (xobject instanceof PDTransparencyGroup)
                    {
                        context.showTransparencyGroup((PDTransparencyGroup) xobject);
                    }
                    else
                    {
                        context.showForm((PDFormXObject) xobject);
                    }
                }
                finally
                {
                    context.decreaseLevel();
                }
            }
        }

        @Override
        public String getName()
        {
            return OperatorName.DRAW_OBJECT;
        }
    }