| 0,0 → 1,88 |
|---|
| /* |
| * This is public domain software - that is, you can do whatever you want |
| * with it, and include it software that is licensed under the GNU or the |
| * BSD license, or whatever other licence you choose, including proprietary |
| * closed source licenses. I do ask that you leave this header in tact. |
| * |
| * If you make modifications to this code that you think would benefit the |
| * wider community, please send me a copy and I'll post it on my site. |
| * |
| * If you make use of this code, I'd appreciate hearing about it. |
| * drew@drewnoakes.com |
| * Latest version of this software kept at |
| * http://drewnoakes.com/ |
| */ |
| package com.drew.metadata.jpeg; |
| |
| import com.drew.metadata.Directory; |
| import com.drew.metadata.MetadataException; |
| import com.drew.metadata.TagDescriptor; |
| |
| /** |
| * 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. |
| */ |
| public class JpegDescriptor extends TagDescriptor |
| { |
| public JpegDescriptor(Directory directory) |
| { |
| super(directory); |
| } |
| |
| public String getDescription(int tagType) throws MetadataException |
| { |
| switch (tagType) |
| { |
| case JpegDirectory.TAG_JPEG_COMPONENT_DATA_1: |
| return getComponentDataDescription(0); |
| case JpegDirectory.TAG_JPEG_COMPONENT_DATA_2: |
| return getComponentDataDescription(1); |
| case JpegDirectory.TAG_JPEG_COMPONENT_DATA_3: |
| return getComponentDataDescription(2); |
| case JpegDirectory.TAG_JPEG_COMPONENT_DATA_4: |
| return getComponentDataDescription(3); |
| case JpegDirectory.TAG_JPEG_DATA_PRECISION: |
| return getDataPrecisionDescription(); |
| case JpegDirectory.TAG_JPEG_IMAGE_HEIGHT: |
| return getImageHeightDescription(); |
| case JpegDirectory.TAG_JPEG_IMAGE_WIDTH: |
| return getImageWidthDescription(); |
| } |
| |
| return _directory.getString(tagType); |
| } |
| |
| public String getImageWidthDescription() |
| { |
| return _directory.getString(JpegDirectory.TAG_JPEG_IMAGE_WIDTH) + " pixels"; |
| } |
| |
| public String getImageHeightDescription() |
| { |
| return _directory.getString(JpegDirectory.TAG_JPEG_IMAGE_HEIGHT) + " pixels"; |
| } |
| |
| public String getDataPrecisionDescription() |
| { |
| return _directory.getString(JpegDirectory.TAG_JPEG_DATA_PRECISION) + " bits"; |
| } |
| |
| public String getComponentDataDescription(int componentNumber) throws MetadataException |
| { |
| JpegComponent component = ((JpegDirectory)_directory).getComponent(componentNumber); |
| |
| if (component==null) |
| throw new MetadataException("No Jpeg component exists with number " + componentNumber); |
| |
| StringBuffer sb = new StringBuffer(); |
| sb.append(component.getComponentName()); |
| sb.append(" component: Quantization table "); |
| sb.append(component.getQuantizationTableNumber()); |
| sb.append(", Sampling factors "); |
| sb.append(component.getHorizontalSamplingFactor()); |
| sb.append(" horiz/"); |
| sb.append(component.getVerticalSamplingFactor()); |
| sb.append(" vert"); |
| return sb.toString(); |
| } |
| } |