[MSHARED-922] Remove checksum calculation from DefaultProjectDeployer

The checksums are generated by Maven Resolver

This closes #16
diff --git a/src/main/java/org/apache/maven/shared/transfer/project/deploy/internal/DefaultProjectDeployer.java b/src/main/java/org/apache/maven/shared/transfer/project/deploy/internal/DefaultProjectDeployer.java
index 1a066dc..166ca24 100644
--- a/src/main/java/org/apache/maven/shared/transfer/project/deploy/internal/DefaultProjectDeployer.java
+++ b/src/main/java/org/apache/maven/shared/transfer/project/deploy/internal/DefaultProjectDeployer.java
@@ -20,7 +20,6 @@
  */
 
 import java.io.File;
-import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.List;
@@ -37,7 +36,6 @@
 import org.apache.maven.shared.transfer.repository.RepositoryManager;
 import org.codehaus.plexus.component.annotations.Component;
 import org.codehaus.plexus.component.annotations.Requirement;
-import org.codehaus.plexus.util.FileUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -59,8 +57,6 @@
     @Requirement
     private RepositoryManager repositoryManager;
 
-    private final DualDigester digester = new DualDigester();
-
     /**
      * {@inheritDoc}
      */
@@ -127,7 +123,6 @@
             deployableArtifacts.add( attached );
         }
 
-        installChecksumsForAllArtifacts( buildingRequest, deployableArtifacts );
         deploy( buildingRequest, deployableArtifacts, artifactRepository, retryFailedDeploymentCount );
     }
 
@@ -149,23 +144,6 @@
         }
     }
 
-    private void installChecksumsForAllArtifacts( ProjectBuildingRequest request, Collection<Artifact> artifacts )
-    {
-        for ( Artifact item : artifacts )
-        {
-            try
-            {
-                LOGGER.debug( "Installing checksum for " + item.getId() );
-                installChecksums( request, item );
-            }
-            catch ( IOException e )
-            {
-                // THINK HARD ABOUT IT
-                LOGGER.error( "Failure during checksum generation for " + item.getId() );
-            }
-        }
-    }
-
     private void deploy( ProjectBuildingRequest request, Collection<Artifact> artifacts,
                          ArtifactRepository deploymentRepository, int retryFailedDeploymentCount )
         throws ArtifactDeployerException
@@ -207,76 +185,4 @@
         }
     }
 
-    /**
-     * @param buildingRequest The project building request, must not be <code>null</code>.
-     * @param artifact The artifact for which to create checksums, must not be <code>null</code>.
-     * @throws IOException If the checksums could not be installed.
-     */
-    private void installChecksums( ProjectBuildingRequest buildingRequest, Artifact artifact )
-        throws IOException
-    {
-        File artifactFile = getLocalRepoFile( buildingRequest, artifact );
-        installChecksums( artifactFile );
-    }
-
-    /**
-     * Installs the checksums for the specified file (if it exists).
-     *
-     * @param installedFile The path to the already installed file in the local repo for which to generate checksums,
-     *            must not be <code>null</code>.
-     * @throws IOException In case of errors. Could not install checksums.
-     */
-    private void installChecksums( File installedFile )
-        throws IOException
-    {
-        boolean signatureFile = installedFile.getName().endsWith( ".asc" );
-        if ( installedFile.isFile() && !signatureFile )
-        {
-            LOGGER.debug( "Calculating checksums for " + installedFile );
-            digester.calculate( installedFile );
-            installChecksum( installedFile, ".md5", digester.getMd5() );
-            installChecksum( installedFile, ".sha1", digester.getSha1() );
-        }
-    }
-
-    /**
-     * Installs a checksum for the specified file.
-     *
-     * @param installedFile The base path from which the path to the checksum files is derived by appending the given
-     *            file extension, must not be <code>null</code>.
-     * @param ext The file extension (including the leading dot) to use for the checksum file, must not be
-     *            <code>null</code>.
-     * @param checksum the checksum to write
-     * @throws IOException If the checksum could not be installed.
-     */
-    private void installChecksum( File installedFile, String ext, String checksum )
-        throws IOException
-    {
-        File checksumFile = new File( installedFile.getAbsolutePath() + ext );
-        LOGGER.debug( "Installing checksum to " + checksumFile );
-        try
-        {
-            // noinspection ResultOfMethodCallIgnored
-            checksumFile.getParentFile().mkdirs();
-            FileUtils.fileWrite( checksumFile.getAbsolutePath(), "UTF-8", checksum );
-        }
-        catch ( IOException e )
-        {
-            throw new IOException( "Failed to install checksum to " + checksumFile, e );
-        }
-    }
-
-    /**
-     * Gets the path of the specified artifact within the local repository. Note that the returned path need not exist
-     * (yet).
-     *
-     * @param buildingRequest The project building request, must not be <code>null</code>.
-     * @param artifact The artifact whose local repo path should be determined, must not be <code>null</code>.
-     * @return The absolute path to the artifact when installed, never <code>null</code>.
-     */
-    private File getLocalRepoFile( ProjectBuildingRequest buildingRequest, Artifact artifact )
-    {
-        String path = repositoryManager.getPathForLocalArtifact( buildingRequest, artifact );
-        return new File( repositoryManager.getLocalRepositoryBasedir( buildingRequest ), path );
-    }
 }
diff --git a/src/main/java/org/apache/maven/shared/transfer/project/deploy/internal/DualDigester.java b/src/main/java/org/apache/maven/shared/transfer/project/deploy/internal/DualDigester.java
deleted file mode 100644
index 60100dd..0000000
--- a/src/main/java/org/apache/maven/shared/transfer/project/deploy/internal/DualDigester.java
+++ /dev/null
@@ -1,115 +0,0 @@
-package org.apache.maven.shared.transfer.project.deploy.internal;
-
-/*
- * Licensed to the Apache Software Foundation (ASF) under one
- * or more contributor license agreements.  See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership.  The ASF licenses this file
- * to you 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.
- */
-
-import java.io.File;
-import java.io.FileInputStream;
-import java.io.IOException;
-import java.io.InputStream;
-import java.security.MessageDigest;
-import java.security.NoSuchAlgorithmException;
-
-import org.apache.commons.codec.binary.Hex;
-import org.codehaus.plexus.util.IOUtil;
-
-
-/**
- * Calculates md5 and sha1 digest.
- * <p/>
- * Todo: Consider using a thread to calculate one of the digests when the files are large; it's fairly slow !
- *
- * @author Kristian Rosenvold
- */
-//TODO: Think about this class if we could use the ChecksumUtils class of
-// aether-util ? I think we need to go via reflection.
-//
-class DualDigester
-{
-    private final MessageDigest md5 = getDigester( "MD5" );
-
-    private final MessageDigest sh1 = getDigester( "SHA-1" );
-
-    private static final int BUFSIZE = 65536 * 2;
-
-    private final byte[] buffer = new byte[BUFSIZE];
-
-    static MessageDigest getDigester( String algorithm )
-    {
-        try
-        {
-            return MessageDigest.getInstance( algorithm );
-        }
-        catch ( NoSuchAlgorithmException e )
-        {
-            throw new RuntimeException( "Unable to initialize digest " + algorithm + " : " + e.getMessage() );
-        }
-    }
-
-    public void calculate( File file ) throws IOException
-    {
-        FileInputStream fis = null;
-
-        try
-        {
-            fis = new FileInputStream( file );
-            calculate( fis );
-            fis.close();
-            fis = null;
-        }
-        catch ( IOException e )
-        {
-            throw new IOException( "Failed to calculate digest checksum for " + file, e );
-        }
-        finally
-        {
-            IOUtil.close( fis );
-        }
-    }
-
-    void calculate( InputStream stream )
-        throws IOException
-    {
-        md5.reset();
-        sh1.reset();
-        update( stream );
-    }
-
-    public String getMd5()
-    {
-        return Hex.encodeHexString( md5.digest() );
-    }
-
-    public String getSha1()
-    {
-        return Hex.encodeHexString( sh1.digest() );
-    }
-
-    private void update( InputStream is )
-        throws IOException
-    {
-        int size = is.read( buffer, 0, BUFSIZE );
-        while ( size >= 0 )
-        {
-            md5.update( buffer, 0, size );
-            sh1.update( buffer, 0, size );
-            size = is.read( buffer, 0, BUFSIZE );
-        }
-    }
-}