Clover coverage report - Code Coverage for tapestry release 4.0.2
Coverage timestamp: Thu Apr 13 2006 10:52:06 EDT
file stats: LOC: 154   Methods: 7
NCLOC: 99   Classes: 1
 
 Source file Conditionals Statements Methods TOTAL
ResourceDigestSourceImpl.java 100% 94.4% 100% 96.1%
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.Iterator;
 24    import java.util.Map;
 25   
 26    import org.apache.commons.codec.binary.Hex;
 27    import org.apache.hivemind.ApplicationRuntimeException;
 28    import org.apache.hivemind.ClassResolver;
 29    import org.apache.hivemind.util.IOUtils;
 30    import org.apache.tapestry.event.ReportStatusEvent;
 31    import org.apache.tapestry.event.ReportStatusListener;
 32    import org.apache.tapestry.event.ResetEventListener;
 33   
 34    /**
 35    * Implementation of {@link org.apache.tapestry.asset.ResourceDigestSource} that calculates an
 36    * DIGEST checksum digest and converts it to a string of hex digits.
 37    *
 38    * @author Howard M. Lewis Ship
 39    * @since 4.0
 40    */
 41    public class ResourceDigestSourceImpl implements ResourceDigestSource, ResetEventListener,
 42    ReportStatusListener
 43    {
 44    private String _serviceId;
 45   
 46    private ClassResolver _classResolver;
 47   
 48    private static final int BUFFER_SIZE = 5000;
 49   
 50    /**
 51    * Map keyed on resource path of DIGEST checksum (as a string).
 52    */
 53   
 54    private final Map _cache = new HashMap();
 55   
 56  79 public synchronized String getDigestForResource(String resourcePath)
 57    {
 58  79 String result = (String) _cache.get(resourcePath);
 59   
 60  79 if (result == null)
 61    {
 62  37 result = computeMD5(resourcePath);
 63  36 _cache.put(resourcePath, result);
 64    }
 65   
 66  78 return result;
 67    }
 68   
 69  1 public synchronized void resetEventDidOccur()
 70    {
 71  1 _cache.clear();
 72    }
 73   
 74  17 public synchronized void reportStatus(ReportStatusEvent event)
 75    {
 76  17 event.title(_serviceId);
 77  17 event.property("resource count", _cache.size());
 78   
 79  17 Iterator i = _cache.entrySet().iterator();
 80   
 81  17 while (i.hasNext())
 82    {
 83  25 Map.Entry entry = (Map.Entry) i.next();
 84   
 85  25 event.property(entry.getKey().toString(), entry.getValue());
 86    }
 87    }
 88   
 89  37 private String computeMD5(String resourcePath)
 90    {
 91  37 URL url = _classResolver.getResource(resourcePath);
 92   
 93  37 if (url == null)
 94  1 throw new ApplicationRuntimeException(AssetMessages.noSuchResource(resourcePath));
 95   
 96  36 InputStream stream = null;
 97   
 98  36 try
 99    {
 100  36 MessageDigest digest = MessageDigest.getInstance("MD5");
 101   
 102  36 stream = new BufferedInputStream(url.openStream());
 103   
 104  36 digestStream(digest, stream);
 105   
 106  36 stream.close();
 107  36 stream = null;
 108   
 109  36 byte[] bytes = digest.digest();
 110  36 char[] encoded = Hex.encodeHex(bytes);
 111   
 112  36 return new String(encoded);
 113    }
 114    catch (IOException ex)
 115    {
 116  0 throw new ApplicationRuntimeException(AssetMessages.unableToReadResource(
 117    resourcePath,
 118    ex));
 119    }
 120    catch (Exception ex)
 121    {
 122  0 throw new ApplicationRuntimeException(ex);
 123    }
 124    finally
 125    {
 126  36 IOUtils.close(stream);
 127    }
 128    }
 129   
 130  36 private void digestStream(MessageDigest digest, InputStream stream) throws IOException
 131    {
 132  36 byte[] buffer = new byte[BUFFER_SIZE];
 133   
 134  36 while (true)
 135    {
 136  94 int length = stream.read(buffer);
 137   
 138  94 if (length < 0)
 139  36 return;
 140   
 141  58 digest.update(buffer, 0, length);
 142    }
 143    }
 144   
 145  28 public void setClassResolver(ClassResolver classResolver)
 146    {
 147  28 _classResolver = classResolver;
 148    }
 149   
 150  25 public void setServiceId(String serviceId)
 151    {
 152  25 _serviceId = serviceId;
 153    }
 154    }