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30 day Evaluation Version distributed via the Maven Jar Repository. Clover is not free. You have 30 days to evaluate it. Please visit http://www.thecortex.net/clover to obtain a licensed version of Clover | |||||||||||||||||||
Source file | Conditionals | Statements | Methods | TOTAL | |||||||||||||||
ResourceDigestSourceImpl.java | 100% | 93.1% | 100% | 95% |
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// Copyright 2005 The Apache Software Foundation
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package org.apache.tapestry.asset;
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import java.io.BufferedInputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.net.URL;
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import java.security.MessageDigest;
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import java.util.HashMap;
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import java.util.Map;
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import org.apache.commons.codec.binary.Hex;
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import org.apache.hivemind.ApplicationRuntimeException;
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import org.apache.hivemind.ClassResolver;
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import org.apache.hivemind.util.IOUtils;
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import org.apache.tapestry.event.ResetEventListener;
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/**
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* Implementation of {@link org.apache.tapestry.asset.ResourceDigestSource} that calculates an
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* DIGEST checksum digest and converts it to a string of hex digits.
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*
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* @author Howard M. Lewis Ship
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* @since 4.0
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*/
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public class ResourceDigestSourceImpl implements ResourceDigestSource, ResetEventListener |
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{ |
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private ClassResolver _classResolver;
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private static final int BUFFER_SIZE = 5000; |
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/**
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* Map keyed on resource path of DIGEST checksum (as a string).
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*/
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private final Map _cache = new HashMap(); |
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public synchronized String getDigestForResource(String resourcePath) |
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{ |
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String result = (String) _cache.get(resourcePath); |
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if (result == null) |
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{ |
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result = computeMD5(resourcePath); |
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_cache.put(resourcePath, result); |
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} |
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return result;
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} |
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public synchronized void resetEventDidOccur() |
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{ |
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_cache.clear(); |
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} |
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private String computeMD5(String resourcePath)
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{ |
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URL url = _classResolver.getResource(resourcePath); |
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if (url == null) |
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throw new ApplicationRuntimeException(AssetMessages.noSuchResource(resourcePath)); |
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InputStream stream = null;
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try
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{ |
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MessageDigest digest = MessageDigest.getInstance("MD5");
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stream = new BufferedInputStream(url.openStream());
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digestStream(digest, stream); |
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stream.close(); |
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stream = null;
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byte[] bytes = digest.digest();
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char[] encoded = Hex.encodeHex(bytes);
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return new String(encoded); |
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} |
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catch (IOException ex)
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{ |
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throw new ApplicationRuntimeException(AssetMessages.unableToReadResource( |
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resourcePath, |
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ex)); |
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} |
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catch (Exception ex)
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{ |
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throw new ApplicationRuntimeException(ex); |
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} |
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finally
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{ |
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IOUtils.close(stream); |
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} |
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} |
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private void digestStream(MessageDigest digest, InputStream stream) throws IOException |
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{ |
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byte[] buffer = new byte[BUFFER_SIZE]; |
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while (true) |
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{ |
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int length = stream.read(buffer);
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if (length < 0)
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return;
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digest.update(buffer, 0, length); |
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} |
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} |
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public void setClassResolver(ClassResolver classResolver) |
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{ |
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_classResolver = classResolver; |
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} |
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} |
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