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/*
* Copyright 2002-2017 Drew Noakes
*
* 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.jpeg;
import com.drew.lang.annotations.NotNull;
import com.drew.lang.annotations.Nullable;
import com.drew.metadata.TagDescriptor;
import static com.drew.metadata.jpeg.HuffmanTablesDirectory.*;
/**
* Provides a human-readable string version of the tag stored in a {@link HuffmanTablesDirectory}.
*
* <ul>
* <li>https://en.wikipedia.org/wiki/Huffman_coding</li>
* <li>http://stackoverflow.com/a/4954117</li>
* </ul>
*
* @author Nadahar
*/
@SuppressWarnings("WeakerAccess")
public class HuffmanTablesDescriptor extends TagDescriptor<HuffmanTablesDirectory>
{
public HuffmanTablesDescriptor(@NotNull HuffmanTablesDirectory directory)
{
super(directory);
}
@Override
@Nullable
public String getDescription(int tagType)
{
switch (tagType) {
case TAG_NUMBER_OF_TABLES:
return getNumberOfTablesDescription();
default:
return super.getDescription(tagType);
}
}
@Nullable
public String getNumberOfTablesDescription()
{
Integer value = _directory.getInteger(TAG_NUMBER_OF_TABLES);
if (value == null)
return null;
return value + (value == 1 ? " Huffman table" : " Huffman tables");
}
}
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