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/*
* Copyright 2002-2012 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:
*
* http://drewnoakes.com/code/exif/
* http://code.google.com/p/metadata-extractor/
*/
package com.drew.metadata.xmp;
import com.drew.imaging.PhotographicConversions;
import com.drew.lang.Rational;
import com.drew.lang.annotations.NotNull;
import com.drew.lang.annotations.Nullable;
import com.drew.metadata.TagDescriptor;
import java.text.DecimalFormat;
/**
* Contains all logic for the presentation of xmp data, as stored in Xmp-Segment. Use
* this class to provide human-readable descriptions of tag values.
*
* @author Torsten Skadell, Drew Noakes http://drewnoakes.com
*/
public class XmpDescriptor extends TagDescriptor<XmpDirectory>
{
// TODO some of these methods look similar to those found in Exif*Descriptor... extract common functionality from both
@NotNull
private static final java.text.DecimalFormat SimpleDecimalFormatter = new DecimalFormat("0.#");
public XmpDescriptor(@NotNull XmpDirectory directory)
{
super(directory);
}
/** Do some simple formatting, dependant upon tagType */
public String getDescription(int tagType)
{
switch (tagType) {
case XmpDirectory.TAG_MAKE:
case XmpDirectory.TAG_MODEL:
return _directory.getString(tagType);
case XmpDirectory.TAG_EXPOSURE_TIME:
return getExposureTimeDescription();
case XmpDirectory.TAG_EXPOSURE_PROGRAM:
return getExposureProgramDescription();
case XmpDirectory.TAG_SHUTTER_SPEED:
return getShutterSpeedDescription();
case XmpDirectory.TAG_F_NUMBER:
return getFNumberDescription();
case XmpDirectory.TAG_LENS:
case XmpDirectory.TAG_LENS_INFO:
case XmpDirectory.TAG_CAMERA_SERIAL_NUMBER:
case XmpDirectory.TAG_FIRMWARE:
return _directory.getString(tagType);
case XmpDirectory.TAG_FOCAL_LENGTH:
return getFocalLengthDescription();
case XmpDirectory.TAG_APERTURE_VALUE:
return getApertureValueDescription();
default:
return super.getDescription(tagType);
}
}
/** Do a simple formatting like ExifSubIFDDescriptor.java */
@Nullable
public String getExposureTimeDescription()
{
final String value = _directory.getString(XmpDirectory.TAG_EXPOSURE_TIME);
if (value==null)
return null;
return value + " sec";
}
/** This code is from ExifSubIFDDescriptor.java */
@Nullable
public String getExposureProgramDescription()
{
// '1' means manual control, '2' program normal, '3' aperture priority,
// '4' shutter priority, '5' program creative (slow program),
// '6' program action(high-speed program), '7' portrait mode, '8' landscape mode.
final Integer value = _directory.getInteger(XmpDirectory.TAG_EXPOSURE_PROGRAM);
if (value==null)
return null;
switch (value) {
case 1:
return "Manual control";
case 2:
return "Program normal";
case 3:
return "Aperture priority";
case 4:
return "Shutter priority";
case 5:
return "Program creative (slow program)";
case 6:
return "Program action (high-speed program)";
case 7:
return "Portrait mode";
case 8:
return "Landscape mode";
default:
return "Unknown program (" + value + ")";
}
}
/** This code is from ExifSubIFDDescriptor.java */
@Nullable
public String getShutterSpeedDescription()
{
final Float value = _directory.getFloatObject(XmpDirectory.TAG_SHUTTER_SPEED);
if (value==null)
return null;
// thanks to Mark Edwards for spotting and patching a bug in the calculation of this
// description (spotted bug using a Canon EOS 300D)
// thanks also to Gli Blr for spotting this bug
if (value <= 1) {
float apexPower = (float) (1 / (Math.exp(value * Math.log(2))));
long apexPower10 = Math.round((double) apexPower * 10.0);
float fApexPower = (float) apexPower10 / 10.0f;
return fApexPower + " sec";
} else {
int apexPower = (int) ((Math.exp(value * Math.log(2))));
return "1/" + apexPower + " sec";
}
}
/** Do a simple formatting like ExifSubIFDDescriptor.java */
@Nullable
public String getFNumberDescription()
{
final Rational value = _directory.getRational(XmpDirectory.TAG_F_NUMBER);
if (value==null)
return null;
return "F" + SimpleDecimalFormatter.format(value.doubleValue());
}
/** This code is from ExifSubIFDDescriptor.java */
@Nullable
public String getFocalLengthDescription()
{
final Rational value = _directory.getRational(XmpDirectory.TAG_FOCAL_LENGTH);
if (value==null)
return null;
java.text.DecimalFormat formatter = new DecimalFormat("0.0##");
return formatter.format(value.doubleValue()) + " mm";
}
/** This code is from ExifSubIFDDescriptor.java */
@Nullable
public String getApertureValueDescription()
{
final Double value = _directory.getDoubleObject(XmpDirectory.TAG_APERTURE_VALUE);
if (value==null)
return null;
double fStop = PhotographicConversions.apertureToFStop(value);
return "F" + SimpleDecimalFormatter.format(fStop);
}
}
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