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This is a fork of com.drewnoakes' metadata-extractor that relocates com.adobe.internal to com.adobe. Java library for extracting EXIF, IPTC, XMP, ICC and other metadata from image and video files.
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/*
 * Copyright 2002-2019 Drew Noakes and contributors
 *
 *    Licensed 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.
 *
 * More information about this project is available at:
 *
 *    https://drewnoakes.com/code/exif/
 *    https://github.com/drewnoakes/metadata-extractor
 */
package com.drew.metadata.png;

import com.drew.imaging.png.PngChunkType;
import com.drew.lang.annotations.NotNull;
import com.drew.metadata.Directory;

import java.util.HashMap;

/**
 * @author Drew Noakes https://drewnoakes.com
 */
@SuppressWarnings("WeakerAccess")
public class PngDirectory extends Directory
{
    public static final int TAG_IMAGE_WIDTH = 1;
    public static final int TAG_IMAGE_HEIGHT = 2;
    public static final int TAG_BITS_PER_SAMPLE = 3;
    public static final int TAG_COLOR_TYPE = 4;
    public static final int TAG_COMPRESSION_TYPE = 5;
    public static final int TAG_FILTER_METHOD = 6;
    public static final int TAG_INTERLACE_METHOD = 7;
    public static final int TAG_PALETTE_SIZE = 8;
    public static final int TAG_PALETTE_HAS_TRANSPARENCY = 9;
    public static final int TAG_SRGB_RENDERING_INTENT = 10;
    public static final int TAG_GAMMA = 11;
    public static final int TAG_ICC_PROFILE_NAME = 12;
    public static final int TAG_TEXTUAL_DATA = 13;
    public static final int TAG_LAST_MODIFICATION_TIME = 14;
    public static final int TAG_BACKGROUND_COLOR = 15;

    public static final int TAG_PIXELS_PER_UNIT_X = 16;
    public static final int TAG_PIXELS_PER_UNIT_Y = 17;
    public static final int TAG_UNIT_SPECIFIER = 18;

    public static final int TAG_SIGNIFICANT_BITS = 19;

    @NotNull
    private static final HashMap _tagNameMap = new HashMap();

    static {
        _tagNameMap.put(TAG_IMAGE_HEIGHT, "Image Height");
        _tagNameMap.put(TAG_IMAGE_WIDTH, "Image Width");
        _tagNameMap.put(TAG_BITS_PER_SAMPLE, "Bits Per Sample");
        _tagNameMap.put(TAG_COLOR_TYPE, "Color Type");
        _tagNameMap.put(TAG_COMPRESSION_TYPE, "Compression Type");
        _tagNameMap.put(TAG_FILTER_METHOD, "Filter Method");
        _tagNameMap.put(TAG_INTERLACE_METHOD, "Interlace Method");
        _tagNameMap.put(TAG_PALETTE_SIZE, "Palette Size");
        _tagNameMap.put(TAG_PALETTE_HAS_TRANSPARENCY, "Palette Has Transparency");
        _tagNameMap.put(TAG_SRGB_RENDERING_INTENT, "sRGB Rendering Intent");
        _tagNameMap.put(TAG_GAMMA, "Image Gamma");
        _tagNameMap.put(TAG_ICC_PROFILE_NAME, "ICC Profile Name");
        _tagNameMap.put(TAG_TEXTUAL_DATA, "Textual Data");
        _tagNameMap.put(TAG_LAST_MODIFICATION_TIME, "Last Modification Time");
        _tagNameMap.put(TAG_BACKGROUND_COLOR, "Background Color");
        _tagNameMap.put(TAG_PIXELS_PER_UNIT_X, "Pixels Per Unit X");
        _tagNameMap.put(TAG_PIXELS_PER_UNIT_Y, "Pixels Per Unit Y");
        _tagNameMap.put(TAG_UNIT_SPECIFIER, "Unit Specifier");
        _tagNameMap.put(TAG_SIGNIFICANT_BITS, "Significant Bits");
    }

    private final PngChunkType _pngChunkType;

    public PngDirectory(@NotNull PngChunkType pngChunkType)
    {
        _pngChunkType = pngChunkType;

        this.setDescriptor(new PngDescriptor(this));
    }

    @NotNull
    public PngChunkType getPngChunkType()
    {
        return _pngChunkType;
    }

    @Override
    @NotNull
    public String getName()
    {
        return "PNG-" + _pngChunkType.getIdentifier();
    }

    @Override
    @NotNull
    protected HashMap getTagNameMap()
    {
        return _tagNameMap;
    }
}