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java.lang.Object org.apache.wicket.request.resource.caching.version.MessageDigestResourceVersion
public class MessageDigestResourceVersion
computes the message digest of a IStaticCacheableResource
and uses it as a version string
Constructor Summary | |
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MessageDigestResourceVersion()
create an instance of the message digest resource version provider using algorithm |
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MessageDigestResourceVersion(String algorithm)
create an instance of the message digest resource version provider using the specified algorithm. |
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MessageDigestResourceVersion(String algorithm,
Bytes bufferSize)
create an instance of the message digest resource version provider using the specified algorithm. |
Method Summary | |
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protected byte[] |
computeDigest(InputStream inputStream)
compute digest for resource stream |
protected MessageDigest |
getMessageDigest()
get instance of message digest provider from JCA |
String |
getVersion(IStaticCacheableResource resource)
get unique string identifying the version of the resource |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public MessageDigestResourceVersion()
MessageDigestResourceVersion(String)
,
MessageDigestResourceVersion(String, org.apache.wicket.util.lang.Bytes)
public MessageDigestResourceVersion(String algorithm)
MessageDigest.getInstance(String)
. For digest computation
an internal buffer of up to
bytes will be used.
algorithm
- digest algorithmMessageDigestResourceVersion()
,
MessageDigestResourceVersion(String, org.apache.wicket.util.lang.Bytes)
public MessageDigestResourceVersion(String algorithm, Bytes bufferSize)
MessageDigest.getInstance(String)
. For digest computation
an internal buffer with a maximum size specified by parameter
bufferSize
will be used.
algorithm
- digest algorithmbufferSize
- maximum size for internal bufferMethod Detail |
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public String getVersion(IStaticCacheableResource resource)
IResourceVersion
getVersion
in interface IResourceVersion
resource
- cacheable resource
null
if version string could not be calculatedprotected MessageDigest getMessageDigest()
protected byte[] computeDigest(InputStream inputStream) throws IOException
inputStream
- input stream to compute message digest for
ResourceStreamNotFoundException
IOException
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