public Object getValue(String expression) {
            Object value = valueSource.getValue(expression);

            if (value != null && expression.startsWith(bannedPrefix)) {
                String msg = "The expression ${" + expression + "} is deprecated.";
                if (newPrefix != null && !newPrefix.isEmpty()) {
                    msg += " Please use ${" + newPrefix + expression.substring(bannedPrefix.length()) + "} instead.";

            for (String expression : BASEDIR_EXPRESSIONS) {
                if (s.startsWith(expression)) {
                    basedirExpr = expression;
                    break;
                }
            }

            if (basedirExpr != null) {
                if (s.length() > basedirExpr.length()) {
                    // Take out basedir expression and the leading slash

        if (basedir != null) {
            interpolator.addValueSource(new AbstractValueSource(false) {
                @Override
                public Object getValue(String expression) {
                    if ("basedir".equals(expression) || "project.basedir".equals(expression)) {
                        return basedir.toAbsolutePath().toString();
                    }
                    return null;
                }
            });

import org.codehaus.plexus.component.configurator.expression.ExpressionEvaluationException;
import org.codehaus.plexus.component.configurator.expression.TypeAwareExpressionEvaluator;

/**
 * Evaluator for plugin parameters expressions. Content surrounded by <code>${</code> and <code>}</code> is evaluated.
 * Recognized values are:
 * <table border="1">
 * <caption>Expression matrix</caption>

import org.codehaus.plexus.component.configurator.ConfigurationListener;
import org.codehaus.plexus.component.configurator.expression.ExpressionEvaluationException;
import org.codehaus.plexus.component.configurator.expression.ExpressionEvaluator;
import org.codehaus.plexus.component.repository.ComponentDescriptor;
import org.codehaus.plexus.component.repository.exception.ComponentLifecycleException;

permissions and limitations * under the License. */ import org.apache.maven.plugin.AbstractMojo; /** * Does nothing. * * @goal java * @phase generate-sources * * @author Benjamin Bentmann */ public class AMojo extends AbstractMojo { /** @parameter expression="${version}" default-value="1.0" */ private String version; /** @parameter */ private String[] models; public void execute() { } } src/main/java/org/apache/maven/plugins/coreit/BMojo.java src/main/java/org/apache/maven/plugins/coreit/BMojo.java...

package org.apache.maven.plugin;

import org.apache.maven.plugin.descriptor.PluginDescriptor;
import org.codehaus.plexus.component.configurator.ComponentConfigurationException;
import org.codehaus.plexus.component.configurator.expression.ExpressionEvaluationException;
import org.codehaus.plexus.component.repository.exception.ComponentLookupException;

/**
 */
public class PluginConfigurationException extends Exception {

import org.apache.maven.project.MavenProject;
import org.codehaus.plexus.MutablePlexusContainer;
import org.codehaus.plexus.PlexusContainer;
import org.codehaus.plexus.component.configurator.expression.ExpressionEvaluator;
import org.codehaus.plexus.configuration.DefaultPlexusConfiguration;
import org.codehaus.plexus.util.Os;
import org.eclipse.aether.DefaultRepositorySystemSession;
import org.eclipse.aether.RepositorySystem;

import org.apache.maven.project.MavenProject;
import org.codehaus.plexus.MutablePlexusContainer;
import org.codehaus.plexus.PlexusContainer;
import org.codehaus.plexus.component.configurator.expression.ExpressionEvaluator;
import org.codehaus.plexus.configuration.DefaultPlexusConfiguration;
import org.codehaus.plexus.util.Os;
import org.junit.jupiter.api.Test;

                    filters.add(new HighestVersionFilter(num));
                } else if ("l".equals(expression)) {
                    filters.add(new LowestVersionFilter());
                } else if (expression.startsWith("l(") && expression.endsWith(")")) {
                    int num = Integer.parseInt(expression.substring(2, expression.length() - 1));