org.sonarsource.scanner.maven.bootstrap.JavaVersionResolver.java Source code

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Here is the source code for org.sonarsource.scanner.maven.bootstrap.JavaVersionResolver.java

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/*
 * SonarQube Scanner for Maven
 * Copyright (C) 2009-2016 SonarSource SA
 * mailto:contact AT sonarsource DOT com
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
package org.sonarsource.scanner.maven.bootstrap;

import java.util.LinkedList;
import java.util.List;

import javax.annotation.CheckForNull;

import org.apache.maven.execution.MavenSession;
import org.apache.maven.lifecycle.LifecycleExecutor;
import org.apache.maven.plugin.MojoExecution;
import org.apache.maven.plugin.PluginParameterExpressionEvaluator;
import org.apache.maven.plugin.logging.Log;
import org.apache.maven.project.MavenProject;
import org.codehaus.plexus.component.configurator.ComponentConfigurationException;
import org.codehaus.plexus.component.configurator.converters.basic.StringConverter;
import org.codehaus.plexus.component.configurator.expression.ExpressionEvaluator;
import org.codehaus.plexus.configuration.PlexusConfiguration;
import org.codehaus.plexus.configuration.xml.XmlPlexusConfiguration;
import org.codehaus.plexus.util.xml.Xpp3Dom;

public class JavaVersionResolver {
    private static final String MAVEN_COMPILER_PLUGIN = "maven-compiler-plugin";
    private static final String COMPILE_GOAL = MavenUtils.GROUP_ID_APACHE_MAVEN + ":" + MAVEN_COMPILER_PLUGIN
            + ":compile";

    private final MavenSession session;
    private final Log log;
    private List<MojoExecution> mojoExecutions;

    public JavaVersionResolver(MavenSession session, LifecycleExecutor lifecycleExecutor, Log log) {
        this.session = session;
        this.log = log;
        this.mojoExecutions = new LinkedList<>();
        try {
            this.mojoExecutions = lifecycleExecutor.calculateExecutionPlan(session, true, COMPILE_GOAL)
                    .getMojoExecutions();
        } catch (Exception e) {
            log.warn(
                    String.format("Failed to get mojo executions for goal '%s': %s", COMPILE_GOAL, e.getMessage()));
        }
    }

    /**
     * Returns the version of Java used by the maven compiler plugin
     *
     * @param pom the project pom
     * @return the java version
     */
    @CheckForNull
    public String getTarget(MavenProject pom) {
        return MavenUtils.coalesce(getString("target"), MavenUtils.getPluginSetting(pom,
                MavenUtils.GROUP_ID_APACHE_MAVEN, MAVEN_COMPILER_PLUGIN, "target", null));
    }

    @CheckForNull
    public String getSource(MavenProject pom) {
        return MavenUtils.coalesce(getString("source"), MavenUtils.getPluginSetting(pom,
                MavenUtils.GROUP_ID_APACHE_MAVEN, MAVEN_COMPILER_PLUGIN, "source", null));

    }

    @CheckForNull
    private String getString(String parameter) {
        try {
            for (MojoExecution exec : mojoExecutions) {
                Xpp3Dom configuration = exec.getConfiguration();
                PlexusConfiguration pomConfiguration = new XmlPlexusConfiguration(configuration);
                PlexusConfiguration config = pomConfiguration.getChild(parameter);

                ExpressionEvaluator expressionEvaluator = new PluginParameterExpressionEvaluator(session, exec);
                BasicStringConverter converter = new BasicStringConverter();

                String value = converter.fromExpression(config, expressionEvaluator);
                if (value != null) {
                    return value;
                }
            }
        } catch (Exception e) {
            log.warn(String.format("Failed to get parameter '%s' for goal '%s': %s", parameter, COMPILE_GOAL,
                    e.getMessage()));
        }

        return null;
    }

    static class BasicStringConverter extends StringConverter {
        @Override
        public String fromExpression(PlexusConfiguration configuration, ExpressionEvaluator expressionEvaluator)
                throws ComponentConfigurationException {
            return (String) super.fromExpression(configuration, expressionEvaluator);
        }

    }
}