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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.JpegDirectory.*;
/**
* Provides human-readable string versions of the tags stored in a JpegDirectory.
* Thanks to Darrell Silver (www.darrellsilver.com) for the initial version of this class.
*
* @author Drew Noakes https://drewnoakes.com
*/
@SuppressWarnings("WeakerAccess")
public class JpegDescriptor extends TagDescriptor<JpegDirectory>
{
public JpegDescriptor(@NotNull JpegDirectory directory)
{
super(directory);
}
@Override
@Nullable
public String getDescription(int tagType)
{
switch (tagType)
{
case TAG_COMPRESSION_TYPE:
return getImageCompressionTypeDescription();
case TAG_COMPONENT_DATA_1:
return getComponentDataDescription(0);
case TAG_COMPONENT_DATA_2:
return getComponentDataDescription(1);
case TAG_COMPONENT_DATA_3:
return getComponentDataDescription(2);
case TAG_COMPONENT_DATA_4:
return getComponentDataDescription(3);
case TAG_DATA_PRECISION:
return getDataPrecisionDescription();
case TAG_IMAGE_HEIGHT:
return getImageHeightDescription();
case TAG_IMAGE_WIDTH:
return getImageWidthDescription();
default:
return super.getDescription(tagType);
}
}
@Nullable
public String getImageCompressionTypeDescription()
{
return getIndexedDescription(TAG_COMPRESSION_TYPE,
"Baseline",
"Extended sequential, Huffman",
"Progressive, Huffman",
"Lossless, Huffman",
null, // no 4
"Differential sequential, Huffman",
"Differential progressive, Huffman",
"Differential lossless, Huffman",
"Reserved for JPEG extensions",
"Extended sequential, arithmetic",
"Progressive, arithmetic",
"Lossless, arithmetic",
null, // no 12
"Differential sequential, arithmetic",
"Differential progressive, arithmetic",
"Differential lossless, arithmetic");
}
@Nullable
public String getImageWidthDescription()
{
final String value = _directory.getString(TAG_IMAGE_WIDTH);
if (value==null)
return null;
return value + " pixels";
}
@Nullable
public String getImageHeightDescription()
{
final String value = _directory.getString(TAG_IMAGE_HEIGHT);
if (value==null)
return null;
return value + " pixels";
}
@Nullable
public String getDataPrecisionDescription()
{
final String value = _directory.getString(TAG_DATA_PRECISION);
if (value==null)
return null;
return value + " bits";
}
@Nullable
public String getComponentDataDescription(int componentNumber)
{
JpegComponent value = _directory.getComponent(componentNumber);
if (value==null)
return null;
return value.getComponentName() + " component: " + value;
}
}
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