dist-tools/dist-tool-plugin/src/main/java/org/apache/maven/dist/tools/GetPrerequisites.java

package org.apache.maven.dist.tools;

import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.maven.artifact.versioning.ArtifactVersion;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;

public class GetPrerequisites
{
    /**
     * Currently hard code should be somehow extracted from the configuration file....
     */
    public String[] pluginNames = { 
        "maven-acr-plugin", 
        "maven-ant-plugin", 
        "maven-antrun-plugin",
        "maven-assembly-plugin",
        "maven-changelog-plugin",
        "maven-changes-plugin",
        "maven-checkstyle-plugin",
        "maven-clean-plugin",
        "maven-compiler-plugin",
        "maven-dependency-plugin",
        "maven-deploy-plugin",
        "maven-doap-plugin",
        "maven-docck-plugin",
        "maven-ear-plugin",
        "maven-eclipse-plugin",
        "maven-ejb-plugin",
        "maven-gpg-plugin",
        "maven-help-plugin",
        "maven-install-plugin",
        "maven-invoker-plugin",
        "maven-jar-plugin",
        "maven-jarsigner-plugin",
        "maven-javadoc-plugin",
        "maven-linkcheck-plugin",
        "maven-patch-plugin",
        "maven-pdf-plugin",
        "maven-pmd-plugin",
        "maven-project-info-reports-plugin",
        "maven-rar-plugin",
        "maven-remote-resources-plugin",
        "maven-repository-plugin",
        "maven-scm-publish-plugin",
        "maven-shade-plugin",
        "maven-site-plugin",
        "maven-source-plugin",
        "maven-stage-plugin",
        "maven-toolchains-plugin",
        "maven-verifier-plugin",
        "maven-war-plugin",
        
    };

    public String BASEURL = "http://maven.apache.org/plugins/";

    public MavenJDKInformation getMavenJdkInformation( String baseURL, String pluginName )
        throws IOException
    {
        Document doc = Jsoup.connect( baseURL + "/" + pluginName + "/plugin-info.html" ).get();

        Elements select = doc.select( "table.bodyTable" );

        Element tableInfo = select.get( 1 );
        Elements elementsByAttribute_a = tableInfo.getElementsByAttributeValue( "class", "a" );
        Elements elementsByAttribute_b = tableInfo.getElementsByAttributeValue( "class", "b" );
        String mavenVersion = elementsByAttribute_a.first().text();
        String jdkVersion = elementsByAttribute_b.first().text();
        
        //FIXME: Sometimes it happens that the indexes are swapped (I don't know why...I have to find out why...)
        if (mavenVersion.startsWith( "JDK" )) {
            String tmp = jdkVersion;
            jdkVersion = mavenVersion;
            mavenVersion = tmp;
        }

        //Leave only version part...
        mavenVersion = mavenVersion.replace( "Maven ", "" );
        jdkVersion = jdkVersion.replace( "JDK ", "" );

        MavenJDKInformation mjdk = new MavenJDKInformation( pluginName, mavenVersion, jdkVersion );
        return mjdk;
    }

    public List<MavenJDKInformation> getPrequisites() {
        List<MavenJDKInformation> result = new ArrayList<MavenJDKInformation>();
        
        for ( int i = 0; i < pluginNames.length; i++ )
        {
            try
            {
                result.add( getMavenJdkInformation( BASEURL, pluginNames[i] ));
            }
            catch ( IOException e )
            {
                //What could happen?
                //check it...
            }
        }
        return result;
    }


    public Map<ArtifactVersion, List<MavenJDKInformation>> getGroupedPrequisites() {
        Map<ArtifactVersion, List<MavenJDKInformation>> result = new HashMap<ArtifactVersion, List<MavenJDKInformation>>();
        
        List<MavenJDKInformation> prequisites = getPrequisites();
        for ( MavenJDKInformation mavenJDKInformation : prequisites )
        {
            if (!result.containsKey( mavenJDKInformation.getMavenVersion() )) {
                result.put( mavenJDKInformation.getMavenVersion(), new ArrayList<MavenJDKInformation>());
            }
            result.get( mavenJDKInformation.getMavenVersion()).add( mavenJDKInformation );
        }
        
        return result;
    }
}