* <p>
         * This is using the visitor from {@link SnapshotTaskInputsBuildOperationType} since there is no difference
         * between tasks and transforms in this regard. Later we can unify the transform and the task build operation type.
         */
        void visitInputFileProperties(FilePropertyVisitor visitor);

        /**
         * The names of the output properties.
         * <p>

        then:
        output.count("> Transform lib1.jar (project :lib) with MakeBlueToGreenThings") == 1
        output.count("> Transform lib2.jar (project :lib) with MakeBlueToGreenThings") == 1
        output.count("> Transform lib1.jar (project :lib) with MakeGreenToYellowThings") == 1
        output.count("> Transform lib2.jar (project :lib) with MakeGreenToYellowThings") == 1

     *
     * @param problem the problem to transform
     * @param id the operation id associated with the problem
     * @return the transformed problem
     */
    Problem transform(Problem problem, OperationIdentifier id);

        }
    }

    /**
     * A getClass() transformer.
     *
     * @param <T> The type of the object
     * @return A getClass() transformer.
     */
    public static <T> Transformer<Class<T>, T> type() {
        return new Transformer<Class<T>, T>() {
            @Override
            public Class<T> transform(T original) {
                @SuppressWarnings("unchecked")

        spec.optimized >> optimize

        expect:
        def args = transformer.transform(spec)
        args.containsAll(expected)

        where:
        debug | optimize | expected
        true  | false    | ["-g"]
        false | true     | ["-O3"]
        true  | true     | ["-g", "-O3"]
    }

    def "transforms system header and include args correctly"() {
        def spec = Stub(NativeCompileSpec)

package org.gradle.internal.classpath.transforms;

import org.gradle.internal.classpath.ClasspathBuilder;
import org.gradle.internal.classpath.ClasspathEntryVisitor;
import org.gradle.internal.classpath.ClasspathWalker;
import org.gradle.internal.classpath.types.InstrumentationTypeRegistry;

import java.io.File;
import java.io.IOException;

        T unpackedValue = value.getWithoutSideEffect();
        Provider<? extends S> transformedProvider = transformer.transform(unpackedValue);
        if (transformedProvider == null) {
            return Providers.notDefined();
        }

        // Note, that the potential side effect of the transformed provider
        // is going to be executed before this fixed side effect.

When a user runs a Gradle build Gradle it uses transformed plugin jars. 
The whole transformation process normally happens on the first use of a build or when a plugin jar is added to the build script classpath.
We transform the jar and cache transformed jars for future use.

We transform plugins classpath, TestKit classpath and buildscript classes separately. 

    /**
     * The from attributes of the registered transform.
     */
    Map<String, String> getFromAttributes();

    /**
     * The to attributes of the registered transform.
     */
    Map<String, String> getToAttributes();

    /**
     * The file name of the input artifact that is about to be transformed.
     */
    String getArtifactName();

    /**

            TransformWorkspaceIdentity transformWorkspaceIdentity,
            Transform transform,
            ComponentIdentifier componentIdentifier
        ) {
            this.inputArtifact = inputArtifact;
            this.transformWorkspaceIdentity = transformWorkspaceIdentity;
            this.transform = transform;
            this.componentIdentifier = componentIdentifier;
        }

        @Override