# PDFileAttachmentAppearanceHandler.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.interactive.annotation.handlers;

    import java.io.IOException;

    import org.apache.commons.logging.Log;
    import org.apache.commons.logging.LogFactory;
    import org.apache.pdfbox.pdmodel.PDAppearanceContentStream;
    import org.apache.pdfbox.pdmodel.PDDocument;
    import org.apache.pdfbox.pdmodel.common.PDRectangle;
    import org.apache.pdfbox.pdmodel.interactive.annotation.PDAnnotation;
    import org.apache.pdfbox.pdmodel.interactive.annotation.PDAnnotationFileAttachment;

    /**
     *
     * @author Tilman Hausherr
     */
    public class PDFileAttachmentAppearanceHandler extends PDAbstractAppearanceHandler
    {
        private static final Log LOG = LogFactory.getLog(PDFileAttachmentAppearanceHandler.class);

        public PDFileAttachmentAppearanceHandler(PDAnnotation annotation)
        {
            super(annotation);
        }

        public PDFileAttachmentAppearanceHandler(PDAnnotation annotation, PDDocument document)
        {
            super(annotation, document);
        }

        @Override
        public void generateNormalAppearance()
        {
            PDAnnotationFileAttachment annotation = (PDAnnotationFileAttachment) getAnnotation();

            try (PDAppearanceContentStream contentStream = getNormalAppearanceAsContentStream())
            {
                setOpacity(contentStream, annotation.getConstantOpacity());

                // minimum code of PDTextAppearanceHandler.adjustRectAndBBox()
                int size = 18;
                PDRectangle rect = getRectangle();
                rect.setUpperRightX(rect.getLowerLeftX() + size);
                rect.setLowerLeftY(rect.getUpperRightY() - size);
                annotation.setRectangle(rect);
                annotation.getNormalAppearanceStream().setBBox(new PDRectangle(size, size));

                //TODO support Graph, PushPin, Paperclip, Tag
                drawPaperclip(contentStream);
            }
            catch (IOException e)
            {
                LOG.error(e);
            }
        }

        /**
         * Draw a paperclip. Shape is from
         * <a href="https://raw.githubusercontent.com/Iconscout/unicons/master/svg/line/paperclip.svg>Iconscout</a>
         * (Apache licensed).
         *
         * @param contentStream
         * @throws IOException
         */
        private void drawPaperclip(final PDAppearanceContentStream contentStream) throws IOException
        {
            contentStream.moveTo(13.574f, 9.301f);
            contentStream.lineTo(8.926f, 13.949f);
            contentStream.curveTo(7.648f, 15.227f, 5.625f, 15.227f, 4.426f, 13.949f);
            contentStream.curveTo(3.148f, 12.676f, 3.148f, 10.648f, 4.426f, 9.449f);
            contentStream.lineTo(10.426f, 3.449f);
            contentStream.curveTo(11.176f, 2.773f, 12.301f, 2.773f, 13.051f, 3.449f);
            contentStream.curveTo(13.801f, 4.199f, 13.801f, 5.398f, 13.051f, 6.074f);
            contentStream.lineTo(7.875f, 11.25f);
            contentStream.curveTo(7.648f, 11.477f, 7.273f, 11.477f, 7.051f, 11.25f);
            contentStream.curveTo(6.824f, 11.023f, 6.824f, 10.648f, 7.051f, 10.426f);
            contentStream.lineTo(10.875f, 6.602f);
            contentStream.curveTo(11.176f, 6.301f, 11.176f, 5.852f, 10.875f, 5.551f);
            contentStream.curveTo(10.574f, 5.25f, 10.125f, 5.25f, 9.824f, 5.551f);
            contentStream.lineTo(6f, 9.449f);
            contentStream.curveTo(5.176f, 10.273f, 5.176f, 11.551f, 6f, 12.375f);
            contentStream.curveTo(6.824f, 13.125f, 8.102f, 13.125f, 8.926f, 12.375f);
            contentStream.lineTo(14.102f, 7.199f);
            contentStream.curveTo(15.449f, 5.852f, 15.449f, 3.75f, 14.102f, 2.398f);
            contentStream.curveTo(12.75f, 1.051f, 10.648f, 1.051f, 9.301f, 2.398f);
            contentStream.lineTo(3.301f, 8.398f);
            contentStream.curveTo(2.398f, 9.301f, 1.949f, 10.5f, 1.949f, 11.699f);
            contentStream.curveTo(1.949f, 14.324f, 4.051f, 16.352f, 6.676f, 16.352f);
            contentStream.curveTo(7.949f, 16.352f, 9.074f, 15.824f, 9.977f, 15f);
            contentStream.lineTo(14.625f, 10.352f);
            contentStream.curveTo(14.926f, 10.051f, 14.926f, 9.602f, 14.625f, 9.301f);
            contentStream.curveTo(14.324f, 9f, 13.875f, 9f, 13.574f, 9.301f);
            contentStream.closePath();
            contentStream.fill();
        }

        @Override
        public void generateRolloverAppearance()
        {
            // No rollover appearance generated
        }

        @Override
        public void generateDownAppearance()
        {
            // No down appearance generated
        }
    }