import org.apache.maven.toolchain.RequirementMatcherFactory;
import org.apache.maven.toolchain.ToolchainFactory;
import org.apache.maven.toolchain.ToolchainPrivate;
import org.apache.maven.toolchain.model.ToolchainModel;
import org.codehaus.plexus.util.xml.Xpp3Dom;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * JDK toolchain factory.
 * This is a <code>ToolchainFactory</code> Plexus component registered with

                public org.apache.maven.api.Toolchain createToolchain(
                        @Nonnull org.apache.maven.api.toolchain.ToolchainModel model) throws ToolchainFactoryException {
                    try {
                        return getToolchainV4(v3Factory.createToolchain(new ToolchainModel(model)));
                    } catch (MisconfiguredToolchainException e) {
                        throw new RuntimeException(e);

            throws MavenExecutionRequestPopulationException {
        if (toolchains != null) {
            Map<String, List<ToolchainModel>> groupedToolchains = new HashMap<>(2);

            for (ToolchainModel model : toolchains.getToolchains()) {
                if (!groupedToolchains.containsKey(model.getType())) {
                    groupedToolchains.put(model.getType(), new ArrayList<>());

              <!--              <exclude>org.apache.maven.toolchain.merge.MavenToolchainMerger#mergeToolchainModelConfiguration(org.apache.maven.toolchain.model.ToolchainModel,org.apache.maven.toolchain.model.ToolchainModel):METHOD_REMOVED</exclude>-->
            </excludes>
          </parameter>

package org.apache.maven.toolchain.java;

import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;

import org.apache.maven.toolchain.DefaultToolchain;
import org.apache.maven.toolchain.model.ToolchainModel;
import org.apache.maven.utils.Os;
import org.slf4j.Logger;

/**
 * JDK toolchain implementation.
 *
 * @since 2.0.9, renamed from DefaultJavaToolChain in 3.2.4

 * under the License.
 */
package org.apache.maven.api;

import java.util.Map;

import org.apache.maven.api.annotations.Experimental;
import org.apache.maven.api.toolchain.ToolchainModel;

/**
 * Represents a toolchain in the Maven build system.
 *
 * <p>A toolchain is a set of tools that can be used to build a project.
 * This interface allows users to define and configure various toolchains

        return builderId;
    }

    @Override
    public Map<String, List<ToolchainModel>> getToolchains() {
        if (toolchains == null) {
            toolchains = new HashMap<>();
        }
        return toolchains;
    }

    @Override
    public MavenExecutionRequest setToolchains(Map<String, List<ToolchainModel>> toolchains) {
        this.toolchains = toolchains;
        return this;
    }

        <field>
          <name>toolchains</name>
          <version>1.0.0+</version>
          <description>The toolchain instance definition.</description>
          <association xml.itemsStyle="flat">
            <type>ToolchainModel</type>
            <multiplicity>*</multiplicity>
          </association>
        </field>
      </fields>
      <codeSegments>
        <codeSegment>
          <version>1.0.0/1.1.0</version>

     * @return this request
     * @since 3.3.0
     */
    MavenExecutionRequest setToolchains(Map<String, List<ToolchainModel>> toolchains);

    /**
     *
     * @return all toolchains grouped by type, never {@code null}
     * @since 3.3.0
     */
    Map<String, List<ToolchainModel>> getToolchains();

    /**
     * @since 3.3.0
     * @deprecated use {@link #setRootDirectory(Path)} instead
     */

              <exclude>org.apache.maven.toolchain.DefaultToolchain#DefaultToolchain(org.apache.maven.toolchain.model.ToolchainModel,org.codehaus.plexus.logging.Logger):CONSTRUCTOR_REMOVED</exclude>
              <exclude>org.apache.maven.toolchain.DefaultToolchain#DefaultToolchain(org.apache.maven.toolchain.model.ToolchainModel,java.lang.String,org.codehaus.plexus.logging.Logger):CONSTRUCTOR_REMOVED</exclude>