ResourceDigestGeneratorImpl.java
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org.apache.tapestry5.internal.services |
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Apache Tapestry 5 |
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// Copyright 2006, 2007, 2008 The Apache Software Foundation
//
// 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.
package org.apache.tapestry5.internal.services;
import org.apache.commons.codec.binary.Hex;
import org.apache.tapestry5.ioc.internal.util.CollectionFactory;
import org.apache.tapestry5.ioc.internal.util.InternalUtils;
import org.apache.tapestry5.services.ResourceDigestGenerator;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.security.MessageDigest;
import java.util.Collection;
import java.util.Set;
/**
* Implementation of {@link ResourceDigestGenerator} that generates MD5 digests.
*/
public class ResourceDigestGeneratorImpl implements ResourceDigestGenerator
{
private static final int BUFFER_SIZE = 5000;
private final Set<String> digestExtensions;
public ResourceDigestGeneratorImpl(Collection<String> configuration)
{
digestExtensions = CollectionFactory.newSet(configuration);
}
public String generateDigest(URL url)
{
InputStream stream = null;
try
{
MessageDigest digest = MessageDigest.getInstance("MD5");
stream = new BufferedInputStream(url.openStream());
digestStream(digest, stream);
stream.close();
stream = null;
byte[] bytes = digest.digest();
char[] encoded = Hex.encodeHex(bytes);
return new String(encoded);
}
catch (Exception ex)
{
throw new RuntimeException(ex);
}
finally
{
InternalUtils.close(stream);
}
}
private void digestStream(MessageDigest digest, InputStream stream) throws IOException
{
byte[] buffer = new byte[BUFFER_SIZE];
while (true)
{
int length = stream.read(buffer);
if (length < 0) return;
digest.update(buffer, 0, length);
}
}
/**
* Current implementation is based on the path extension, and a configured list of extensions.
*/
public boolean requiresDigest(String path)
{
int dotx = path.lastIndexOf('.');
String extension = path.substring(dotx + 1).toLowerCase();
return digestExtensions.contains(extension);
}
}
The table below shows all metrics for ResourceDigestGeneratorImpl.java.
| Metric | Value | Description | |
|---|---|---|---|