Clover coverage report - Code Coverage for tapestry release 4.0-beta-10
Coverage timestamp: Sat Oct 8 2005 19:08:05 EDT
file stats: LOC: 128   Methods: 5
NCLOC: 79   Classes: 1
 
 Source file Conditionals Statements Methods TOTAL
ResourceDigestSourceImpl.java 100% 93.1% 100% 95%
coverage coverage
 1    // Copyright 2005 The Apache Software Foundation
 2    //
 3    // Licensed under the Apache License, Version 2.0 (the "License");
 4    // you may not use this file except in compliance with the License.
 5    // You may obtain a copy of the License at
 6    //
 7    // http://www.apache.org/licenses/LICENSE-2.0
 8    //
 9    // Unless required by applicable law or agreed to in writing, software
 10    // distributed under the License is distributed on an "AS IS" BASIS,
 11    // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 12    // See the License for the specific language governing permissions and
 13    // limitations under the License.
 14   
 15    package org.apache.tapestry.asset;
 16   
 17    import java.io.BufferedInputStream;
 18    import java.io.IOException;
 19    import java.io.InputStream;
 20    import java.net.URL;
 21    import java.security.MessageDigest;
 22    import java.util.HashMap;
 23    import java.util.Map;
 24   
 25    import org.apache.commons.codec.binary.Hex;
 26    import org.apache.hivemind.ApplicationRuntimeException;
 27    import org.apache.hivemind.ClassResolver;
 28    import org.apache.hivemind.util.IOUtils;
 29    import org.apache.tapestry.event.ResetEventListener;
 30   
 31    /**
 32    * Implementation of {@link org.apache.tapestry.asset.ResourceDigestSource} that calculates an
 33    * DIGEST checksum digest and converts it to a string of hex digits.
 34    *
 35    * @author Howard M. Lewis Ship
 36    * @since 4.0
 37    */
 38    public class ResourceDigestSourceImpl implements ResourceDigestSource, ResetEventListener
 39    {
 40    private ClassResolver _classResolver;
 41   
 42    private static final int BUFFER_SIZE = 5000;
 43   
 44    /**
 45    * Map keyed on resource path of DIGEST checksum (as a string).
 46    */
 47   
 48    private final Map _cache = new HashMap();
 49   
 50  81 public synchronized String getDigestForResource(String resourcePath)
 51    {
 52  81 String result = (String) _cache.get(resourcePath);
 53   
 54  81 if (result == null)
 55    {
 56  38 result = computeMD5(resourcePath);
 57  37 _cache.put(resourcePath, result);
 58    }
 59   
 60  80 return result;
 61    }
 62   
 63  1 public synchronized void resetEventDidOccur()
 64    {
 65  1 _cache.clear();
 66    }
 67   
 68  38 private String computeMD5(String resourcePath)
 69    {
 70  38 URL url = _classResolver.getResource(resourcePath);
 71   
 72  38 if (url == null)
 73  1 throw new ApplicationRuntimeException(AssetMessages.noSuchResource(resourcePath));
 74   
 75  37 InputStream stream = null;
 76   
 77  37 try
 78    {
 79  37 MessageDigest digest = MessageDigest.getInstance("MD5");
 80   
 81  37 stream = new BufferedInputStream(url.openStream());
 82   
 83  37 digestStream(digest, stream);
 84   
 85  37 stream.close();
 86  37 stream = null;
 87   
 88  37 byte[] bytes = digest.digest();
 89  37 char[] encoded = Hex.encodeHex(bytes);
 90   
 91  37 return new String(encoded);
 92    }
 93    catch (IOException ex)
 94    {
 95  0 throw new ApplicationRuntimeException(AssetMessages.unableToReadResource(
 96    resourcePath,
 97    ex));
 98    }
 99    catch (Exception ex)
 100    {
 101  0 throw new ApplicationRuntimeException(ex);
 102    }
 103    finally
 104    {
 105  37 IOUtils.close(stream);
 106    }
 107    }
 108   
 109  37 private void digestStream(MessageDigest digest, InputStream stream) throws IOException
 110    {
 111  37 byte[] buffer = new byte[BUFFER_SIZE];
 112   
 113  37 while (true)
 114    {
 115  96 int length = stream.read(buffer);
 116   
 117  96 if (length < 0)
 118  37 return;
 119   
 120  59 digest.update(buffer, 0, length);
 121    }
 122    }
 123   
 124  29 public void setClassResolver(ClassResolver classResolver)
 125    {
 126  29 _classResolver = classResolver;
 127    }
 128    }