Activity - gzipDecompression

Activity Type: Transformation

Description

Decompress the data output from other activities, using the GNU-ZIP compression format.

Example

<gzipDecompression name="transform">
  <settings checksum="adler32"/>
  <input from="myStatementOutput"/>
  <decompressedOutput name="myDecompressedOutput"/>
  <metadataOutput name="myMetadataOutput"/>
</gzipDecompression>

Specification

Element gzipDecompression:

• Attribute name - unique name for the activity within the scope of a request.
• Element settings (optional) - the control settings for the decompression.
  • Attribute checksum - the type of checksum generate for the decompressed data. The checksum can be used for validation purposes. Legal values of the attribute are:
    • adler32 - Adler32 checksum (faster).
    • crc32 - CRC32 checksum.
• Element input (required) - where to find the data to decompress.
  • Attribute from - name of an input stream providing GNU-ZIPped data to be decompressed.
• decompressedOutput (required) - output stream for the decompressed data (bytes).
  • Attribute name - name of this output stream.
• metadataOutput (required) - output stream for decompression meta-data (XML data including the checksum).
  • Attribute name - name of this output stream.

Input and Output Types

• Input: input - byte[]
• Output: decompressedOutput - byte[]
• Output: metadataOutput - java.lang.String (XML)
Example:

<gzipDecompressionMetadata>
  <checksum type="adler32" value="2097352997"/>
</gzipDecompressionMetadata>

Data Resource Accessor

This activity can operate with any data resource accessor.

XML Schema

OGSA-DAI/schema/ogsadai/xsd/activities/gzip_decompression.xsd

Class

uk.org.ogsadai.activity.transform.GZIPDecompressionActivity

Client Toolkit Class

uk.org.ogsadai.client.toolkit.activity.transform.GZIPDecompression