DisplayDependencyUpdatesMojo.java

package org.codehaus.mojo.versions;

/*
 * 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 javax.inject.Inject;
import javax.xml.stream.XMLStreamException;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Optional;
import java.util.Set;
import java.util.TreeSet;
import java.util.stream.Collectors;

import org.apache.maven.artifact.ArtifactUtils;
import org.apache.maven.artifact.manager.WagonManager;
import org.apache.maven.artifact.metadata.ArtifactMetadataRetrievalException;
import org.apache.maven.artifact.metadata.ArtifactMetadataSource;
import org.apache.maven.artifact.resolver.ArtifactResolver;
import org.apache.maven.artifact.versioning.ArtifactVersion;
import org.apache.maven.model.Build;
import org.apache.maven.model.Dependency;
import org.apache.maven.model.DependencyManagement;
import org.apache.maven.model.Plugin;
import org.apache.maven.plugin.MojoExecutionException;
import org.apache.maven.plugin.MojoFailureException;
import org.apache.maven.plugins.annotations.Mojo;
import org.apache.maven.plugins.annotations.Parameter;
import org.apache.maven.project.MavenProject;
import org.apache.maven.project.MavenProjectBuilder;
import org.apache.maven.repository.RepositorySystem;
import org.codehaus.mojo.versions.api.ArtifactVersions;
import org.codehaus.mojo.versions.api.Segment;
import org.codehaus.mojo.versions.filtering.DependencyFilter;
import org.codehaus.mojo.versions.filtering.WildcardMatcher;
import org.codehaus.mojo.versions.rewriting.ModifiedPomXMLEventReader;
import org.codehaus.mojo.versions.utils.DependencyComparator;
import org.codehaus.mojo.versions.utils.SegmentUtils;
import org.codehaus.plexus.util.StringUtils;

import static java.util.Optional.empty;
import static java.util.Optional.of;
import static org.apache.commons.lang3.StringUtils.countMatches;
import static org.codehaus.mojo.versions.api.Segment.MAJOR;

/**
 * Displays all dependencies that have newer versions available.
 * It will also display dependencies which are used by a plugin or
 * defined in the plugin within a pluginManagement.
 *
 * @author Stephen Connolly
 * @since 1.0-alpha-1
 */
@Mojo( name = "display-dependency-updates", threadSafe = true )
public class DisplayDependencyUpdatesMojo
    extends AbstractVersionsDisplayMojo
{

    // ------------------------------ FIELDS ------------------------------

    /**
     * The width to pad info messages.
     *
     * @since 1.0-alpha-1
     */
    private static final int INFO_PAD_SIZE = 72;

    /**
     * Whether to process the dependencyManagement section of the project.
     *
     * @since 1.2
     */
    @Parameter( property = "processDependencyManagement", defaultValue = "true" )
    private boolean processDependencyManagement;

    /**
     * Whether to process the dependencyManagement part transitive or not.
     * In case of <code>&lt;type&gt;pom&lt;/type&gt;</code>and
     * <code>&lt;scope&gt;import&lt;/scope&gt;</code> this means
     * by default to report also the imported dependencies.
     * If processTransitive is set to <code>false</code> the report will only show
     * updates of the imported pom it self.
     *
     * @since 2.11
     */
    @Parameter( property = "processDependencyManagementTransitive", defaultValue = "true" )
    private boolean processDependencyManagementTransitive;

    /**
     * Only take these artifacts into consideration.
     * <p>
     * Comma-separated list of extended GAV patterns.
     *
     * <p>
     * Extended GAV: groupId:artifactId:version:type:classifier:scope
     * </p>
     * <p>
     * The wildcard "*" can be used as the only, first, last or both characters in each token.
     * The version token does support version ranges.
     * </p>
     *
     * <p>
     * Example: {@code "mygroup:artifact:*,*:*:*:*:*:compile"}
     * </p>
     *
     * @since 2.12.0
     */
    @Parameter( property = "dependencyManagementIncludes", defaultValue = WildcardMatcher.WILDCARD )
    private List<String> dependencyManagementIncludes;

    /**
     * Exclude these artifacts from consideration.
     * <p>
     * Comma-separated list of extended GAV patterns.
     *
     * <p>
     * Extended GAV: groupId:artifactId:version:type:classifier:scope
     * </p>
     * <p>
     * The wildcard "*" can be used as the only, first, last or both characters in each token.
     * The version token does support version ranges.
     * </p>
     *
     * <p>
     * Example: {@code "mygroup:artifact:*,*:*:*:*:*:provided,*:*:*:*:*:system"}
     * </p>
     *
     * @since 2.12.0
     */
    @Parameter( property = "dependencyManagementExcludes" )
    private List<String> dependencyManagementExcludes;

    /**
     * Whether to process the dependencies section of the project.
     *
     * @since 1.2
     */
    @Parameter( property = "processDependencies", defaultValue = "true" )
    private boolean processDependencies;

    /**
     * Only take these artifacts into consideration.
     * <p>
     * Comma-separated list of extended GAV patterns.
     *
     * <p>
     * Extended GAV: groupId:artifactId:version:type:classifier:scope
     * </p>
     * <p>
     * The wildcard "*" can be used as the only, first, last or both characters in each token.
     * The version token does support version ranges.
     * </p>
     *
     * <p>
     * Example: {@code "mygroup:artifact:*,*:*:*:*:*:compile"}
     * </p>
     *
     * @since 2.12.0
     */
    @Parameter( property = "dependencyIncludes", defaultValue = WildcardMatcher.WILDCARD )
    private List<String> dependencyIncludes;

    /**
     * Exclude these artifacts from consideration.
     * <p>
     * Comma-separated list of extended GAV patterns.
     *
     * <p>
     * Extended GAV: groupId:artifactId:version:type:classifier:scope
     * </p>
     * <p>
     * The wildcard "*" can be used as the only, first, last or both characters in each token.
     * The version token does support version ranges.
     * </p>
     *
     * <p>
     * Example: {@code "mygroup:artifact:*,*:*:*:*:*:provided,*:*:*:*:*:system"}
     * </p>
     *
     * @since 2.12.0
     */
    @Parameter( property = "dependencyExcludes" )
    private List<String> dependencyExcludes;

    /**
     * Whether to process the dependencies sections of plugins.
     *
     * @since 2.5
     */
    @Parameter( property = "processPluginDependencies", defaultValue = "true" )
    private boolean processPluginDependencies;

    /**
     * Whether to process the dependencies sections of plugins which are defined in pluginManagement.
     *
     * @since 2.5
     */
    @Parameter( property = "processPluginDependenciesInPluginManagement", defaultValue = "true" )
    private boolean processPluginDependenciesInPluginManagement;

    /**
     * Whether to allow the major version number to be changed.
     *
     * <p><b>Note: {@code false} also implies {@linkplain #allowAnyUpdates}
     * to be {@code false}</b></p>
     *
     * @since 2.5
     */
    @Parameter( property = "allowMajorUpdates", defaultValue = "true" )
    private boolean allowMajorUpdates = true;

    /**
     * <p>Whether to allow the minor version number to be changed.</p>
     *
     * <p><b>Note: {@code false} also implies {@linkplain #allowAnyUpdates}
     * and {@linkplain #allowMajorUpdates} to be {@code false}</b></p>
     *
     * @since 2.5
     */
    @Parameter( property = "allowMinorUpdates", defaultValue = "true" )
    private boolean allowMinorUpdates = true;

    /**
     * <p>Whether to allow the incremental version number to be changed.</p>
     *
     * <p><b>Note: {@code false} also implies {@linkplain #allowAnyUpdates},
     * {@linkplain #allowMajorUpdates}, and {@linkplain #allowMinorUpdates}
     * to be {@code false}</b></p>
     *
     * @since 2.5
     */
    @Parameter( property = "allowIncrementalUpdates", defaultValue = "true" )
    private boolean allowIncrementalUpdates = true;

    /**
     * Whether to allow any version change to be allowed. This keeps
     * compatibility with previous versions of the plugin.
     * If you set this to false you can control changes in version
     * number by {@link #allowMajorUpdates}, {@link #allowMinorUpdates} or
     * {@link #allowIncrementalUpdates}.
     *
     * @since 2.5
     * @deprecated This will be removed with version 3.0.0
     */
    @Deprecated
    @Parameter( property = "allowAnyUpdates", defaultValue = "true" )
    private boolean allowAnyUpdates = true;

    /**
     * Whether to show additional information such as dependencies that do not need updating. Defaults to false.
     *
     * @since 2.1
     */
    @Parameter( property = "verbose", defaultValue = "false" )
    private boolean verbose;

    /**
     * <p>Only take these artifacts into consideration:<br/>
     * Comma-separated list of {@code groupId:[artifactId[:version]]} patterns</p>
     *
     * <p>
     * The wildcard "*" can be used as the only, first, last or both characters in each token.
     * The version token does support version ranges.
     * </p>
     *
     * <p>
     * Example: {@code "mygroup:artifact:*,othergroup:*,anothergroup"}
     * </p>
     *
     * @since 2.12.0
     */
    @Parameter( property = "pluginDependencyIncludes", defaultValue = WildcardMatcher.WILDCARD )
    private List<String> pluginDependencyIncludes;

    /**
     * <p>Exclude these artifacts into consideration:<br/>
     * Comma-separated list of {@code groupId:[artifactId[:version]]} patterns</p>
     *
     * <p>
     * The wildcard "*" can be used as the only, first, last or both characters in each token.
     * The version token does support version ranges.
     * </p>
     *
     * <p>
     * Example: {@code "mygroup:artifact:*,othergroup:*,anothergroup"}
     * </p>
     *
     * @since 2.12.0
     */
    @Parameter( property = "pluginDependencyExcludes" )
    private List<String> pluginDependencyExcludes;

    /**
     * <p>Only take these artifacts into consideration:<br/>
     * Comma-separated list of {@code groupId:[artifactId[:version]]} patterns</p>

     * The wildcard "*" can be used as the only, first, last or both characters in each token.
     * The version token does support version ranges.
     * </p>
     *
     * <p>
     * Example: {@code "mygroup:artifact:*,othergroup:*,anothergroup"}
     * </p>
     *
     * @since 2.12.0
     */
    @Parameter( property = "pluginManagementDependencyIncludes", defaultValue = WildcardMatcher.WILDCARD )
    private List<String> pluginManagementDependencyIncludes;

    /**
     * <p>Exclude these artifacts into consideration:<br/>
     * Comma-separated list of {@code groupId:[artifactId[:version]]} patterns</p>
     *
     * <p>
     * The wildcard "*" can be used as the only, first, last or both characters in each token.
     * The version token does support version ranges.
     * </p>
     *
     * <p>
     * Example: {@code "mygroup:artifact:*,othergroup:*,anothergroup"}
     * </p>
     *
     * @since 2.12.0
     */
    @Parameter( property = "pluginManagementDependencyExcludes" )
    private List<String> pluginManagementDependencyExcludes;

    // --------------------- GETTER / SETTER METHODS ---------------------

    @Inject
    public DisplayDependencyUpdatesMojo( RepositorySystem repositorySystem,
                                MavenProjectBuilder projectBuilder,
                                ArtifactMetadataSource artifactMetadataSource,
                                WagonManager wagonManager,
                                ArtifactResolver artifactResolver )
    {
        super( repositorySystem, projectBuilder, artifactMetadataSource, wagonManager, artifactResolver );
    }

    private static Set<Dependency> extractPluginDependenciesFromPluginsInPluginManagement( Build build )
    {
        Set<Dependency> result = new TreeSet<>( DependencyComparator.INSTANCE );
        if ( build.getPluginManagement() != null )
        {
            for ( Plugin plugin : build.getPluginManagement().getPlugins() )
            {
                if ( plugin.getDependencies() != null && !plugin.getDependencies().isEmpty() )
                {
                    result.addAll( plugin.getDependencies() );
                }
            }
        }
        return result;
    }

    private static Set<Dependency> extractDependenciesFromPlugins( List<Plugin> plugins )
    {
        Set<Dependency> result = new TreeSet<>( DependencyComparator.INSTANCE );
        for ( Plugin plugin : plugins )
        {
            if ( plugin.getDependencies() != null && !plugin.getDependencies().isEmpty() )
            {
                result.addAll( plugin.getDependencies() );
            }
        }
        return result;
    }

    /**
     * Returns a set of dependencies where the dependencies which are defined in the dependency management section have
     * been filtered out.
     *
     * @param dependencies         The set of dependencies.
     * @param dependencyManagement The set of dependencies from the dependency management section.
     * @return A new set of dependencies which are from the set of dependencies but not from the set of dependency
     * management dependencies.
     * @since 1.0-beta-1
     */
    private static Set<Dependency> removeDependencyManagment( Set<Dependency> dependencies,
                                                              Set<Dependency> dependencyManagement )
    {
        Set<Dependency> result = new TreeSet<>( DependencyComparator.INSTANCE );
        for ( Dependency dependency : dependencies )
        {
            boolean matched = false;
            for ( Dependency managedDependency : dependencyManagement )
            {
                if ( dependenciesMatch( dependency, managedDependency ) )
                {
                    matched = true;
                    break;
                }
            }
            if ( !matched )
            {
                result.add( dependency );
            }
        }
        return result;
    }

    // open for tests
    protected static boolean dependenciesMatch( Dependency dependency, Dependency managedDependency )
    {
        if ( !managedDependency.getGroupId().equals( dependency.getGroupId() ) )
        {
            return false;
        }

        if ( !managedDependency.getArtifactId().equals( dependency.getArtifactId() ) )
        {
            return false;
        }

        if ( managedDependency.getScope() == null
            || Objects.equals( managedDependency.getScope(), dependency.getScope() ) )
        {
            return false;
        }

        if ( managedDependency.getClassifier() == null
            || Objects.equals( managedDependency.getClassifier(), dependency.getClassifier() ) )
        {
            return false;
        }

        return dependency.getVersion() == null
            || managedDependency.getVersion() == null
            || Objects.equals( managedDependency.getVersion(), dependency.getVersion() );
    }

    public boolean isProcessingDependencyManagement()
    {
        return processDependencyManagement;
    }

    public boolean isProcessingDependencies()
    {
        return processDependencies;
    }

    public boolean isProcessingPluginDependencies()
    {
        return processPluginDependencies;
    }

    public boolean isProcessPluginDependenciesInDependencyManagement()
    {
        return processPluginDependenciesInPluginManagement;
    }

    public boolean isVerbose()
    {
        return verbose;
    }

    // ------------------------ INTERFACE METHODS ------------------------

    // --------------------- Interface Mojo ---------------------

    /**
     * @throws org.apache.maven.plugin.MojoExecutionException when things go wrong
     * @throws org.apache.maven.plugin.MojoFailureException   when things go wrong in a very bad way
     * @see org.codehaus.mojo.versions.AbstractVersionsUpdaterMojo#execute()
     * @since 1.0-alpha-1
     */
    @Override
    public void execute()
        throws MojoExecutionException, MojoFailureException
    {
        logInit();

        validateInput();

        Set<Dependency> dependencyManagement = new TreeSet<>( DependencyComparator.INSTANCE );
        DependencyManagement projectDependencyManagement = getProjectDependencyManagement( getProject() );
        if ( projectDependencyManagement != null )
        {

            List<Dependency> dependenciesFromPom = projectDependencyManagement.getDependencies();
            for ( Dependency dependency : dependenciesFromPom )
            {
                getLog().debug( "dependency from pom: " + dependency.getGroupId() + ":" + dependency.getArtifactId()
                                    + ":" + dependency.getVersion() + ":" + dependency.getScope() );
                if ( dependency.getVersion() == null )
                {
                    // get parent and get the information from there.
                    if ( getProject().hasParent() )
                    {
                        getLog().debug( "Reading parent dependencyManagement information" );
                        DependencyManagement parentProjectDependencyManagement =
                            getProjectDependencyManagement( getProject().getParent() );
                        if ( parentProjectDependencyManagement != null )
                        {
                            List<Dependency> parentDeps = parentProjectDependencyManagement.getDependencies();
                            for ( Dependency parentDep : parentDeps )
                            {
                                // only groupId && artifactId needed cause version is null
                                if ( dependency.getGroupId().equals( parentDep.getGroupId() )
                                    && dependency.getArtifactId().equals( parentDep.getArtifactId() )
                                    && dependency.getType().equals( parentDep.getType() ) )
                                {
                                    dependencyManagement.add( parentDep );
                                }
                            }
                        }
                    }
                    else
                    {
                        String message = "We can't get the version for the dependency " + dependency.getGroupId() + ":"
                            + dependency.getArtifactId() + " cause there does not exist a parent.";
                        getLog().error( message );
                        // Throw error cause we will not able to get a version for a dependency.
                        throw new MojoExecutionException( message );
                    }
                }
                else
                {
                    dependencyManagement.add( dependency );
                }
            }
        }

        Set<Dependency> dependencies = new TreeSet<>( DependencyComparator.INSTANCE );
        dependencies.addAll( getProject().getDependencies() );

        if ( isProcessingDependencyManagement() )
        {
            dependencies = removeDependencyManagment( dependencies, dependencyManagement );
        }

        Set<Dependency> pluginDependencies = new TreeSet<>( DependencyComparator.INSTANCE );

        if ( isProcessingPluginDependencies() )
        {
            pluginDependencies = extractDependenciesFromPlugins( getProject().getBuildPlugins() );
        }

        Set<Dependency> pluginDependenciesInPluginManagement = new TreeSet<>( DependencyComparator.INSTANCE );
        if ( isProcessPluginDependenciesInDependencyManagement() )
        {
            pluginDependenciesInPluginManagement =
                extractPluginDependenciesFromPluginsInPluginManagement( getProject().getBuild() );
        }

        try
        {
            if ( isProcessingDependencyManagement() )
            {
                dependencyManagement = filterDependencyManagementIncludes( dependencyManagement );

                logUpdates( getHelper().lookupDependenciesUpdates( dependencyManagement, false ),
                            "Dependency Management" );
            }
            if ( isProcessingDependencies() )
            {
                dependencies = filterDependencyIncludes( dependencies );

                logUpdates( getHelper().lookupDependenciesUpdates( dependencies, false ), "Dependencies" );
            }
            if ( isProcessPluginDependenciesInDependencyManagement() )
            {
                pluginDependenciesInPluginManagement =
                        filterPluginManagementIncludes( pluginDependenciesInPluginManagement );

                logUpdates( getHelper().lookupDependenciesUpdates( pluginDependenciesInPluginManagement, false ),
                            "pluginManagement of plugins" );
            }
            if ( isProcessingPluginDependencies() )
            {
                pluginDependencies = filterPluginDependencyIncludes( pluginDependencies );

                logUpdates( getHelper().lookupDependenciesUpdates( pluginDependencies, false ), "Plugin Dependencies" );
            }
        }
        catch ( ArtifactMetadataRetrievalException e )
        {
            throw new MojoExecutionException( e.getMessage(), e );
        }
    }

    private void validateInput() throws MojoExecutionException
    {
        validateGAVList( dependencyIncludes, 6, "dependencyIncludes" );
        validateGAVList( dependencyExcludes, 6, "dependencyExcludes" );
        validateGAVList( dependencyManagementIncludes, 6, "dependencyManagementIncludes" );
        validateGAVList( dependencyManagementIncludes, 6, "dependencyManagementExcludes" );
        validateGAVList( pluginDependencyIncludes, 3, "pluginDependencyIncludes" );
        validateGAVList( pluginDependencyExcludes, 3, "pluginDependencyExcludes" );
        validateGAVList( pluginManagementDependencyIncludes, 3, "pluginManagementDependencyIncludes" );
        validateGAVList( pluginManagementDependencyExcludes, 3, "pluginManagementDependencyExcludes" );
    }

    /**
     * Validates a list of GAV strings
     * @param gavList list of the input GAV strings
     * @param numSections number of sections in the GAV to verify against
     * @param argumentName argument name to indicate in the exception
     * @throws MojoExecutionException if the argument is invalid
     */
    static void validateGAVList( List<String> gavList, int numSections, String argumentName )
            throws MojoExecutionException
    {
        if ( gavList != null && gavList.stream().anyMatch( gav -> countMatches( gav, ":" ) >= numSections ) )
        {
            throw new MojoExecutionException( argumentName + " should not contain more than 6 segments" );
        }
    }

    private Set<Dependency> filterDependencyIncludes( Set<Dependency> dependencies )
    {
        return filterDependencies( dependencies, dependencyIncludes, dependencyExcludes, "Dependencies" );
    }

    private Set<Dependency> filterDependencyManagementIncludes( Set<Dependency> dependencyManagement )
    {
        return filterDependencies( dependencyManagement,
                                   dependencyManagementIncludes, dependencyManagementExcludes, "Dependecy Management" );
    }

    private Set<Dependency> filterPluginDependencyIncludes( Set<Dependency> dependencies )
    {
        return filterDependencies( dependencies, pluginDependencyIncludes, pluginDependencyExcludes,
                "Plugin Dependencies" );
    }

    private Set<Dependency> filterPluginManagementIncludes( Set<Dependency> dependencyManagement )
    {
        return filterDependencies( dependencyManagement,
                pluginManagementDependencyIncludes, pluginManagementDependencyExcludes,
                "Plugin Management Dependencies" );
    }

    private Set<Dependency> filterDependencies(
        Set<Dependency> dependencies,
        List<String> includes,
        List<String> excludes,
        String section
    )
    {
        DependencyFilter includeDeps = DependencyFilter.parseFrom( includes );
        DependencyFilter excludeDeps = DependencyFilter.parseFrom( excludes );

        Set<Dependency> filtered = includeDeps.retainingIn( dependencies );
        filtered = excludeDeps.removingFrom( filtered );

        if ( getLog().isDebugEnabled() )
        {
            getLog().debug( String.format( "parsed includes in %s: %s -> %s", section, includes, includeDeps ) );
            getLog().debug( String.format( "parsed excludes in %s: %s -> %s", section, excludes, excludeDeps ) );
            getLog().debug( String.format( "Unfiltered %s: ", section ) + output( dependencies ) );
            getLog().debug( String.format( "Filtered %s: ", section ) + output( filtered ) );
        }

        return filtered;
    }

    private String output( Set<Dependency> dependencies )
    {
        return dependencies.stream()
                .map( d -> String.format( "%s:%s:%s", d.getGroupId(), d.getArtifactId(), d.getVersion() ) )
                .collect( Collectors.joining( ", " ) );
    }
    private DependencyManagement getProjectDependencyManagement( MavenProject project )
    {
        if ( processDependencyManagementTransitive )
        {
            return project.getDependencyManagement();
        }
        else
        {
            return project.getOriginalModel().getDependencyManagement();
        }
    }

    private Optional<Segment> calculateUpdateScope()
    {
        return allowAnyUpdates
        ? empty()
        : of( SegmentUtils.determineUnchangedSegment( allowMajorUpdates, allowMinorUpdates,
                allowIncrementalUpdates, getLog() )
                .map( s -> Segment.of( s.value() + 1 ) )
                .orElse( MAJOR ) );
    }

    private void logUpdates( Map<Dependency, ArtifactVersions> updates, String section )
    {
        List<String> withUpdates = new ArrayList<>();
        List<String> usingCurrent = new ArrayList<>();
        for ( ArtifactVersions versions : updates.values() )
        {
            String left = "  " + ArtifactUtils.versionlessKey( versions.getArtifact() ) + " ";
            final String current;
            ArtifactVersion latest;
            if ( versions.isCurrentVersionDefined() )
            {
                current = versions.getCurrentVersion().toString();
                latest = versions.getNewestUpdate( calculateUpdateScope(), allowSnapshots );
            }
            else
            {
                ArtifactVersion newestVersion =
                        versions.getNewestVersion( versions.getArtifact().getVersionRange(), allowSnapshots );
                current = versions.getArtifact().getVersionRange().toString();
                latest = newestVersion == null ? null
                        : versions.getNewestUpdate( newestVersion, calculateUpdateScope(), allowSnapshots );
                if ( latest != null
                        && ArtifactVersions.isVersionInRange( latest, versions.getArtifact().getVersionRange() ) )
                {
                    latest = null;
                }
            }
            String right = " " + ( latest == null ? current : current + " -> " + latest );
            List<String> t = latest == null ? usingCurrent : withUpdates;
            if ( right.length() + left.length() + 3 > INFO_PAD_SIZE + getOutputLineWidthOffset() )
            {
                t.add( left + "..." );
                t.add( StringUtils.leftPad( right, INFO_PAD_SIZE + getOutputLineWidthOffset() ) );

            }
            else
            {
                t.add( StringUtils.rightPad( left, INFO_PAD_SIZE + getOutputLineWidthOffset() - right.length(), "." )
                        + right );
            }
        }

        if ( isVerbose() )
        {
            if ( usingCurrent.isEmpty() )
            {
                if ( !withUpdates.isEmpty() )
                {
                    logLine( false, "No dependencies in " + section + " are using the newest version." );
                    logLine( false, "" );
                }
            }
            else
            {
                logLine( false, "The following dependencies in " + section + " are using the newest version:" );
                for ( String s : usingCurrent )
                {
                    logLine( false, s );
                }
                logLine( false, "" );
            }
        }


        if ( withUpdates.isEmpty() )
        {
            if ( !usingCurrent.isEmpty() )
            {
                logLine( false, "No dependencies in " + section + " have newer versions." );
                logLine( false, "" );
            }
        }
        else
        {
            logLine( false, "The following dependencies in " + section + " have newer versions:" );
            for ( String withUpdate : withUpdates )
            {
                logLine( false, withUpdate );
            }
            logLine( false, "" );
        }
    }

    /**
     * @param pom the pom to update.
     * @throws org.apache.maven.plugin.MojoExecutionException when things go wrong
     * @throws org.apache.maven.plugin.MojoFailureException   when things go wrong in a very bad way
     * @throws javax.xml.stream.XMLStreamException            when things go wrong with XML streaming
     * @see org.codehaus.mojo.versions.AbstractVersionsUpdaterMojo#update(org.codehaus.mojo.versions.rewriting.ModifiedPomXMLEventReader)
     * @since 1.0-alpha-1
     */
    @Override
    protected void update( ModifiedPomXMLEventReader pom )
        throws MojoExecutionException, MojoFailureException, XMLStreamException
    {
        // do nothing
    }

}