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Java example source code file (PNGMetadataFormat.java)

This example Java source code file (PNGMetadataFormat.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

child_policy_choice, child_policy_empty, datatype_integer, datatype_string, ihdr, image, imageio, plteentry, pngmetadataformat, unknownchunk, unknownchunks, util, value_0, value_1, value_255, value_max_16, value_max_32

The PNGMetadataFormat.java Java example source code

/*
 * Copyright (c) 2001, 2004, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package com.sun.imageio.plugins.png;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.ListResourceBundle;
import javax.imageio.ImageTypeSpecifier;
import javax.imageio.metadata.IIOMetadataFormat;
import javax.imageio.metadata.IIOMetadataFormatImpl;

public class PNGMetadataFormat extends IIOMetadataFormatImpl {

    private static IIOMetadataFormat instance = null;

    private static String VALUE_0 = "0";
    private static String VALUE_1 = "1";
    private static String VALUE_12 = "12";
    private static String VALUE_23 = "23";
    private static String VALUE_31 = "31";
    private static String VALUE_59 = "59";
    private static String VALUE_60 = "60";
    private static String VALUE_255 = "255";
    private static String VALUE_MAX_16 = "65535"; // 2^16 - 1
    private static String VALUE_MAX_32 = "2147483647"; // 2^32 - 1

    private PNGMetadataFormat() {
        super(PNGMetadata.nativeMetadataFormatName,
              CHILD_POLICY_SOME);

        // root -> IHDR
        addElement("IHDR", PNGMetadata.nativeMetadataFormatName,
                   CHILD_POLICY_EMPTY);

        addAttribute("IHDR", "width",
                     DATATYPE_INTEGER, true, null,
                     VALUE_1, VALUE_MAX_32, true, true);

        addAttribute("IHDR", "height",
                     DATATYPE_INTEGER, true, null,
                     VALUE_1, VALUE_MAX_32, true, true);

        addAttribute("IHDR", "bitDepth",
                     DATATYPE_INTEGER, true, null,
                     Arrays.asList(PNGMetadata.IHDR_bitDepths));

        String[] colorTypes = {
            "Grayscale", "RGB", "Palette", "GrayAlpha", "RGBAlpha"
        };
        addAttribute("IHDR", "colorType",
                     DATATYPE_STRING, true, null,
                     Arrays.asList(colorTypes));

        addAttribute("IHDR", "compressionMethod",
                     DATATYPE_STRING, true, null,
                     Arrays.asList(PNGMetadata.IHDR_compressionMethodNames));

        addAttribute("IHDR", "filterMethod",
                     DATATYPE_STRING, true, null,
                     Arrays.asList(PNGMetadata.IHDR_filterMethodNames));

        addAttribute("IHDR", "interlaceMethod",
                     DATATYPE_STRING, true, null,
                     Arrays.asList(PNGMetadata.IHDR_interlaceMethodNames));

        // root -> PLTE
        addElement("PLTE", PNGMetadata.nativeMetadataFormatName,
                   1, 256);

        // root -> PLTE -> PLTEEntry
        addElement("PLTEEntry", "PLTE",
                   CHILD_POLICY_EMPTY);

        addAttribute("PLTEEntry", "index",
                     DATATYPE_INTEGER, true, null,
                     VALUE_0, VALUE_255, true, true);

        addAttribute("PLTEEntry", "red",
                     DATATYPE_INTEGER, true, null,
                     VALUE_0, VALUE_255, true, true);

        addAttribute("PLTEEntry", "green",
                     DATATYPE_INTEGER, true, null,
                     VALUE_0, VALUE_255, true, true);

        addAttribute("PLTEEntry", "blue",
                     DATATYPE_INTEGER, true, null,
                     VALUE_0, VALUE_255, true, true);

        // root -> bKGD
        addElement("bKGD", PNGMetadata.nativeMetadataFormatName,
                   CHILD_POLICY_CHOICE);

        // root -> bKGD -> bKGD_Grayscale
        addElement("bKGD_Grayscale", "bKGD",
                   CHILD_POLICY_EMPTY);

        addAttribute("bKGD_Grayscale", "gray",
                     DATATYPE_INTEGER, true, null,
                     VALUE_0, VALUE_MAX_16, true, true);

        // root -> bKGD -> bKGD_RGB
        addElement("bKGD_RGB", "bKGD",
                   CHILD_POLICY_EMPTY);

        addAttribute("bKGD_RGB", "red",
                     DATATYPE_INTEGER, true, null,
                     VALUE_0, VALUE_MAX_16, true, true);

        addAttribute("bKGD_RGB", "green",
                     DATATYPE_INTEGER, true, null,
                     VALUE_0, VALUE_MAX_16, true, true);

        addAttribute("bKGD_RGB", "blue",
                     DATATYPE_INTEGER, true, null,
                     VALUE_0, VALUE_MAX_16, true, true);

        // root -> bKGD -> bKGD_Palette
        addElement("bKGD_Palette", "bKGD",
                   CHILD_POLICY_EMPTY);

        addAttribute("bKGD_Palette", "index",
                     DATATYPE_INTEGER, true, null,
                     VALUE_0, VALUE_255, true, true);

        // root -> cHRM
        addElement("cHRM", PNGMetadata.nativeMetadataFormatName,
                   CHILD_POLICY_EMPTY);

        addAttribute("cHRM", "whitePointX",
                     DATATYPE_INTEGER, true, null,
                     VALUE_0, VALUE_MAX_16, true, true);

        addAttribute("cHRM", "whitePointY",
                     DATATYPE_INTEGER, true, null,
                     VALUE_0, VALUE_MAX_16, true, true);

        addAttribute("cHRM", "redX",
                     DATATYPE_INTEGER, true, null,
                     VALUE_0, VALUE_MAX_16, true, true);

        addAttribute("cHRM", "redY",
                     DATATYPE_INTEGER, true, null,
                     VALUE_0, VALUE_MAX_16, true, true);

        addAttribute("cHRM", "greenX",
                     DATATYPE_INTEGER, true, null,
                     VALUE_0, VALUE_MAX_16, true, true);

        addAttribute("cHRM", "greenY",
                     DATATYPE_INTEGER, true, null,
                     VALUE_0, VALUE_MAX_16, true, true);

        addAttribute("cHRM", "blueX",
                     DATATYPE_INTEGER, true, null,
                     VALUE_0, VALUE_MAX_16, true, true);

        addAttribute("cHRM", "blueY",
                     DATATYPE_INTEGER, true, null,
                     VALUE_0, VALUE_MAX_16, true, true);

        // root -> gAMA
        addElement("gAMA", PNGMetadata.nativeMetadataFormatName,
                   CHILD_POLICY_EMPTY);

        addAttribute("gAMA", "value",
                     DATATYPE_INTEGER, true, null,
                     VALUE_0, VALUE_MAX_32, true, true);

        // root -> hIST
        addElement("hIST", PNGMetadata.nativeMetadataFormatName,
                   1, 256);

        // root -> hISTEntry
        addElement("hISTEntry", "hIST",
                   CHILD_POLICY_EMPTY);

        addAttribute("hISTEntry", "index",
                     DATATYPE_INTEGER, true, null,
                     VALUE_0, VALUE_255, true, true);

        addAttribute("hISTEntry", "value",
                     DATATYPE_INTEGER, true, null,
                     VALUE_0, VALUE_MAX_16, true, true);

        // root -> iCCP
        addElement("iCCP", PNGMetadata.nativeMetadataFormatName,
                   CHILD_POLICY_EMPTY);

        addAttribute("iCCP", "profileName",
                     DATATYPE_STRING, true, null);

        addAttribute("iCCP", "compressionMethod",
                     DATATYPE_STRING, true, null,
                     Arrays.asList(PNGMetadata.iCCP_compressionMethodNames));

        addObjectValue("iCCP", byte.class, 0, Integer.MAX_VALUE);

        // root -> iTXt
        addElement("iTXt", PNGMetadata.nativeMetadataFormatName,
                   1, Integer.MAX_VALUE);

        // root -> iTXt -> iTXtEntry
        addElement("iTXtEntry", "iTXt",
                   CHILD_POLICY_EMPTY);

        addAttribute("iTXtEntry", "keyword",
                     DATATYPE_STRING, true, null);

        addBooleanAttribute("iTXtEntry", "compressionFlag",
                            false, false);

        addAttribute("iTXtEntry", "compressionMethod",
                     DATATYPE_STRING, true, null);

        addAttribute("iTXtEntry", "languageTag",
                     DATATYPE_STRING, true, null);

        addAttribute("iTXtEntry", "translatedKeyword",
                     DATATYPE_STRING, true, null);

        addAttribute("iTXtEntry", "text",
                     DATATYPE_STRING, true, null);

        // root -> pHYS
        addElement("pHYS", PNGMetadata.nativeMetadataFormatName,
                   CHILD_POLICY_EMPTY);

        addAttribute("pHYS", "pixelsPerUnitXAxis",
                     DATATYPE_INTEGER, true, null,
                     VALUE_0, VALUE_MAX_32, true, true);
        addAttribute("pHYS", "pixelsPerUnitYAxis",
                     DATATYPE_INTEGER, true, null,
                     VALUE_0, VALUE_MAX_32, true, true);
        addAttribute("pHYS", "unitSpecifier",
                     DATATYPE_STRING, true, null,
                     Arrays.asList(PNGMetadata.unitSpecifierNames));

        // root -> sBIT
        addElement("sBIT", PNGMetadata.nativeMetadataFormatName,
                   CHILD_POLICY_CHOICE);

        // root -> sBIT -> sBIT_Grayscale
        addElement("sBIT_Grayscale", "sBIT",
                   CHILD_POLICY_EMPTY);

        addAttribute("sBIT_Grayscale", "gray",
                     DATATYPE_INTEGER, true, null,
                     VALUE_0, VALUE_255, true, true);

        // root -> sBIT -> sBIT_GrayAlpha
        addElement("sBIT_GrayAlpha", "sBIT",
                   CHILD_POLICY_EMPTY);

        addAttribute("sBIT_GrayAlpha", "gray",
                     DATATYPE_INTEGER, true, null,
                     VALUE_0, VALUE_255, true, true);

        addAttribute("sBIT_GrayAlpha", "alpha",
                     DATATYPE_INTEGER, true, null,
                     VALUE_0, VALUE_255, true, true);

        // root -> sBIT -> sBIT_RGB
        addElement("sBIT_RGB", "sBIT",
                   CHILD_POLICY_EMPTY);

        addAttribute("sBIT_RGB", "red",
                     DATATYPE_INTEGER, true, null,
                     VALUE_0, VALUE_255, true, true);

        addAttribute("sBIT_RGB", "green",
                     DATATYPE_INTEGER, true, null,
                     VALUE_0, VALUE_255, true, true);

        addAttribute("sBIT_RGB", "blue",
                     DATATYPE_INTEGER, true, null,
                     VALUE_0, VALUE_255, true, true);

        // root -> sBIT -> sBIT_RGBAlpha
        addElement("sBIT_RGBAlpha", "sBIT",
                   CHILD_POLICY_EMPTY);

        addAttribute("sBIT_RGBAlpha", "red",
                     DATATYPE_INTEGER, true, null,
                     VALUE_0, VALUE_255, true, true);

        addAttribute("sBIT_RGBAlpha", "green",
                     DATATYPE_INTEGER, true, null,
                     VALUE_0, VALUE_255, true, true);

        addAttribute("sBIT_RGBAlpha", "blue",
                     DATATYPE_INTEGER, true, null,
                     VALUE_0, VALUE_255, true, true);

        addAttribute("sBIT_RGBAlpha", "alpha",
                     DATATYPE_INTEGER, true, null,
                     VALUE_0, VALUE_255, true, true);

        // root -> sBIT -> sBIT_Palette
        addElement("sBIT_Palette", "sBIT",
                   CHILD_POLICY_EMPTY);

        addAttribute("sBIT_Palette", "red",
                     DATATYPE_INTEGER, true, null,
                     VALUE_0, VALUE_255, true, true);

        addAttribute("sBIT_Palette", "green",
                     DATATYPE_INTEGER, true, null,
                     VALUE_0, VALUE_255, true, true);

        addAttribute("sBIT_Palette", "blue",
                     DATATYPE_INTEGER, true, null,
                     VALUE_0, VALUE_255, true, true);

        // root -> sPLT
        addElement("sPLT", PNGMetadata.nativeMetadataFormatName,
                   1, 256);

        // root -> sPLT -> sPLTEntry
        addElement("sPLTEntry", "sPLT",
                   CHILD_POLICY_EMPTY);

        addAttribute("sPLTEntry", "index",
                     DATATYPE_INTEGER, true, null,
                     VALUE_0, VALUE_255, true, true);

        addAttribute("sPLTEntry", "red",
                     DATATYPE_INTEGER, true, null,
                     VALUE_0, VALUE_255, true, true);

        addAttribute("sPLTEntry", "green",
                     DATATYPE_INTEGER, true, null,
                     VALUE_0, VALUE_255, true, true);

        addAttribute("sPLTEntry", "blue",
                     DATATYPE_INTEGER, true, null,
                     VALUE_0, VALUE_255, true, true);

        addAttribute("sPLTEntry", "alpha",
                     DATATYPE_INTEGER, true, null,
                     VALUE_0, VALUE_255, true, true);

        // root -> sRGB
        addElement("sRGB", PNGMetadata.nativeMetadataFormatName,
                   CHILD_POLICY_EMPTY);

        addAttribute("sRGB", "renderingIntent",
                     DATATYPE_STRING, true, null,
                     Arrays.asList(PNGMetadata.renderingIntentNames));

        // root -> tEXt
        addElement("tEXt", PNGMetadata.nativeMetadataFormatName,
                   1, Integer.MAX_VALUE);

        // root -> tEXt -> tEXtEntry
        addElement("tEXtEntry", "tEXt",
                   CHILD_POLICY_EMPTY);

        addAttribute("tEXtEntry", "keyword",
                     DATATYPE_STRING, true, null);

        addAttribute("tEXtEntry", "value",
                     DATATYPE_STRING, true, null);

        // root -> tIME
        addElement("tIME", PNGMetadata.nativeMetadataFormatName,
                   CHILD_POLICY_EMPTY);

        addAttribute("tIME", "year",
                     DATATYPE_INTEGER, true, null,
                     VALUE_0, VALUE_MAX_16, true, true);

        addAttribute("tIME", "month",
                     DATATYPE_INTEGER, true, null,
                     VALUE_1, VALUE_12, true, true);

        addAttribute("tIME", "day",
                     DATATYPE_INTEGER, true, null,
                     VALUE_1, VALUE_31, true, true);

        addAttribute("tIME", "hour",
                     DATATYPE_INTEGER, true, null,
                     VALUE_0, VALUE_23, true, true);

        addAttribute("tIME", "minute",
                     DATATYPE_INTEGER, true, null,
                     VALUE_0, VALUE_59, true, true);

        addAttribute("tIME", "second",
                     DATATYPE_INTEGER, true, null,
                     VALUE_0, VALUE_60, true, true);

        // root -> tRNS
        addElement("tRNS", PNGMetadata.nativeMetadataFormatName,
                   CHILD_POLICY_CHOICE);

        // root -> tRNS -> tRNS_Grayscale
        addElement("tRNS_Grayscale", "tRNS",
                   CHILD_POLICY_EMPTY);

        addAttribute("tRNS_Grayscale", "gray",
                     DATATYPE_INTEGER, true, null,
                     VALUE_0, VALUE_MAX_16, true, true);

        // root -> tRNS -> tRNS_RGB
        addElement("tRNS_RGB", "tRNS",
                   CHILD_POLICY_EMPTY);

        addAttribute("tRNS_RGB", "red",
                     DATATYPE_INTEGER, true, null,
                     VALUE_0, VALUE_MAX_16, true, true);

        addAttribute("tRNS_RGB", "green",
                     DATATYPE_INTEGER, true, null,
                     VALUE_0, VALUE_MAX_16, true, true);

        addAttribute("tRNS_RGB", "blue",
                     DATATYPE_INTEGER, true, null,
                     VALUE_0, VALUE_MAX_16, true, true);

        // root -> tRNS -> tRNS_Palette
        addElement("tRNS_Palette", "tRNS",
                   CHILD_POLICY_EMPTY);

        addAttribute("tRNS_Palette", "index",
                     DATATYPE_INTEGER, true, null,
                     VALUE_0, VALUE_255, true, true);

        addAttribute("tRNS_Palette", "alpha",
                     DATATYPE_INTEGER, true, null,
                     VALUE_0, VALUE_255, true, true);

        // root -> zTXt
        addElement("zTXt", PNGMetadata.nativeMetadataFormatName,
                   1, Integer.MAX_VALUE);

        // root -> zTXt -> zTXtEntry
        addElement("zTXtEntry", "zTXt",
                   CHILD_POLICY_EMPTY);

        addAttribute("zTXtEntry", "keyword",
                     DATATYPE_STRING, true, null);

        addAttribute("zTXtEntry", "compressionMethod",
                     DATATYPE_STRING, true, null,
                     Arrays.asList(PNGMetadata.zTXt_compressionMethodNames));

        addAttribute("zTXtEntry", "text",
                     DATATYPE_STRING, true, null);

        // root -> UnknownChunks
        addElement("UnknownChunks", PNGMetadata.nativeMetadataFormatName,
                   1, Integer.MAX_VALUE);

        // root -> UnknownChunks -> UnknownChunk
        addElement("UnknownChunk", "UnknownChunks",
                   CHILD_POLICY_EMPTY);

        addAttribute("UnknownChunk", "type",
                     DATATYPE_STRING, true, null);

        addObjectValue("UnknownChunk", byte.class, 0, Integer.MAX_VALUE);
    }

    public boolean canNodeAppear(String elementName,
                                 ImageTypeSpecifier imageType) {
        return true;
    }

    public static synchronized IIOMetadataFormat getInstance() {
        if (instance == null) {
            instance = new PNGMetadataFormat();
        }
        return instance;
    }
}

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