// This prevents recursion on `project.afterEvaluate { project.evaluate() }`
        return state == State.IN_BEFORE_EVALUATE || state == State.IN_EVALUATE || state == State.IN_AFTER_EVALUATE;
    }

    public boolean isUnconfigured() {
        return state == State.UNCONFIGURED;
    }

    public boolean hasCompleted() {
        return state == State.CONFIGURED;
    }

    public void toBeforeEvaluate() {

     * A spec that is not configured always directly matches the toolchain of the current JVM.
     */
    boolean isConfigured();

    /**
     * A spec is valid when {@link #getLanguageVersion() language version} is set (along with any other properties)
     * or when no properties are set.
     * <p>
     * A {@link #isConfigured() non-configured} spec is always valid.
     */
    boolean isValid();

    /**

    }

    @Override
    public Key toKey() {
        return new Key(javaHome);
    }

    @Override
    public boolean isConfigured() {
        return true;
    }

    @Override
    public boolean isValid() {
        return true;
    }

    public File getJavaHome() {
        return javaHome;
    }

    @Override

    public JavaToolchainSpecInternal.Key toKey() {
        return new Key(getLanguageVersion().getOrNull(), getVendor().getOrNull(), getImplementation().getOrNull());
    }

    @Override
    public boolean isConfigured() {
        return getLanguageVersion().isPresent();
    }

    @SuppressWarnings("deprecation")
    @Override
    public boolean isValid() {
        if (getVendor().getOrNull() == JvmVendorSpec.IBM_SEMERU) {

                .withUpgradeGuideSection(7, "invalid_toolchain_specification_deprecation")
                .build();
        }

        boolean useFallback = !requestedSpec.isConfigured();
        JavaToolchainSpecInternal actualSpec = useFallback ? fallbackToolchainSpec : requestedSpec;
        // We can't use the key of the fallback toolchain spec, because it is a spec that can match configured requests as well