net.nicoulaj.maven.plugins.checksum.execution.target.CsvSummaryFileTarget Maven / Gradle / Ivy

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/*-
 * ====================================================================
 * checksum-maven-plugin
 * ====================================================================
 * Copyright (C) 2010 - 2016 Julien Nicoulaud 
 * ====================================================================
 * 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 net.nicoulaj.maven.plugins.checksum.execution.target;


import net.nicoulaj.maven.plugins.checksum.artifacts.ArtifactListener;
import net.nicoulaj.maven.plugins.checksum.mojo.ChecksumFile;

import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.StandardOpenOption;
import java.util.*;

/**
 * An {@link net.nicoulaj.maven.plugins.checksum.execution.target.ExecutionTarget} that writes digests to a CSV file.
 *
 * @author Julien Nicoulaud
 * @since 1.0
 * @version $Id: $Id
 */
public class CsvSummaryFileTarget
    implements ExecutionTarget
{
    /**
     * The line separator character.
     */
    public static final String LINE_SEPARATOR = System.getProperty( "line.separator" );

    /**
     * The CSV column separator character.
     */
    public static final String CSV_COLUMN_SEPARATOR = ",";

    /**
     * The CSV comment marker character.
     */
    public static final String CSV_COMMENT_MARKER = "#";

    /**
     * Encoding to use for generated files.
     */
    protected final String encoding;

    /**
     * The association file => (algorithm,hashcode).
     */
    protected Map> filesHashcodes;

    /**
     * The set of algorithms encountered.
     */
    protected SortedSet algorithms;

    /**
     * The target file where the summary is written.
     */
    protected final File summaryFile;

    /**
     * List of listeners which are notified every time a CSV file is created.
     *
     * @since 1.3
     */
    protected final Iterable artifactListeners;

    /**
     * Build a new instance of {@link net.nicoulaj.maven.plugins.checksum.execution.target.CsvSummaryFileTarget}.
     *
     * @param summaryFile the file to which the summary should be written.
     * @param encoding    the encoding to use for generated files.
     * @param artifactListeners listeners which are notified every time a CSV file is created
     */
    public CsvSummaryFileTarget(File summaryFile, String encoding, Iterable artifactListeners)
    {
        this.summaryFile = summaryFile;
        this.encoding = encoding;
        this.artifactListeners = artifactListeners;
    }

    /** {@inheritDoc} */
    @Override
    public void init()
    {
        filesHashcodes = new HashMap<>();
        algorithms = new TreeSet<>();
    }

    /** {@inheritDoc} */
    @Override
    public void write( String digest, ChecksumFile file, String algorithm )
    {
        // Initialize an entry for the file if needed.
        if ( !filesHashcodes.containsKey( file ) )
        {
            filesHashcodes.put( file, new HashMap() );
        }

        // Store the algorithm => hashcode mapping for this file.
        Map fileHashcodes = filesHashcodes.get( file );
        fileHashcodes.put( algorithm, digest );

        // Store the algorithm.
        algorithms.add( algorithm );
    }

    /** {@inheritDoc} */
    @Override
    public void close(final String subPath )
        throws ExecutionTargetCloseException
    {
        // Make sure the parent directory exists.
        try
        {
            Files.createDirectories( summaryFile.getParentFile().toPath() );
        }
        catch ( IOException e )
        {
            throw new ExecutionTargetCloseException( "Could not create summary file parent directory", e );
        }

        StringBuilder sb = new StringBuilder();

        // Write the CSV file header.
        sb.append( CSV_COMMENT_MARKER ).append( "File" );
        for ( String algorithm : algorithms )
        {
            sb.append( CSV_COLUMN_SEPARATOR ).append( algorithm );
        }

        // Write in sorted order (per globing argument)
        @SuppressWarnings("unchecked")
        Map.Entry>[] entries = filesHashcodes.entrySet().toArray((Map.Entry>[]) new Map.Entry[0] );
        Arrays.sort(entries, new Comparator>>() {
            @Override
            public int compare(Map.Entry> o1, Map.Entry> o2) {
                ChecksumFile f1 = o1.getKey();
                ChecksumFile f2 = o2.getKey();
                return f1.getRelativePath(f1, subPath).compareTo(f2.getRelativePath(f2, subPath));
            }
        });

        // Write a line for each file.
        for ( Map.Entry> entry : entries )
        {
            ChecksumFile file = entry.getKey();
            sb.append( LINE_SEPARATOR ).append( file.getRelativePath(file, subPath) );
            Map fileHashcodes = entry.getValue();
            for ( String algorithm : algorithms )
            {
                sb.append( CSV_COLUMN_SEPARATOR );
                if ( fileHashcodes.containsKey( algorithm ) )
                {
                    sb.append( fileHashcodes.get( algorithm ) );
                }
            }
        }

        sb.append( LINE_SEPARATOR );

        // Write the result to the summary file.
        try
        {
            Files.write(summaryFile.toPath(), sb.toString().getBytes(encoding), StandardOpenOption.CREATE);
            for (ArtifactListener artifactListener : artifactListeners) {
                artifactListener.artifactCreated(summaryFile, "csv", null,null);
            }
        }
        catch ( IOException e )
        {
            throw new ExecutionTargetCloseException( "Failed writing to output summary file", e );
        }
    }
}