Vamos imaginar que queremos ter uma dependência que verifica se o parâmetro de consulta `q` possui um valor fixo.

Porém nós queremos poder parametrizar o conteúdo fixo.

## Uma instância "chamável" { #a-callable-instance }

Em Python existe uma maneira de fazer com que uma instância de uma classe seja um "chamável".

public interface ToolchainPrivate extends Toolchain {

    /**
     * Let the toolchain decide if it matches requirements defined
     * in the toolchain plugin configuration.
     * @param requirements Map<String, String> key value pair, may not be {@code null}
     * @return {@code true} if the requirements match, otherwise {@code false}
     */
    boolean matchesRequirements(Map<String, String> requirements);

    /**
     *

 * <p>
 * Example of creating a custom qualifier:
 * <pre>
 * {@literal @}Qualifier
 * {@literal @}Retention(RUNTIME)
 * public @interface Database {
 *     String value();
 * }
 * </pre>
 *
 * @see Named
 * @since 4.0.0
 */
@Target(ANNOTATION_TYPE)
@Retention(RUNTIME)
@Documented

            return new ArrayList<>(this);
        }

        @Override
        public Iterator<V> iterator() {
            if (map != null) {
                return map.values().iterator();
            } else {
                return list.iterator();
            }
        }

        void mergeAll(Collection<V> vs, Remapping<V> remapping) {
            if (map == null) {

これは、作成した列挙型 `ModelName` の*列挙型メンバ*と比較できます:

{* ../../docs_src/path_params/tutorial005.py hl[17] *}

#### *列挙値*の取得

`model_name.value` 、もしくは一般に、 `your_enum_member.value` を使用して実際の値 (この場合は `str`) を取得できます。

{* ../../docs_src/path_params/tutorial005.py hl[20] *}

/// tip | 豆知識

`ModelName.lenet.value` でも `"lenet"` 値にアクセスできます。

///

#### *列挙型メンバ*の返却

            }
            classExtensionDoc.getExtensionClasses().put(extension.getExtensionId(), model.getClassDoc(extension.getExtensionClass()));
        }
        for (ClassExtensionDoc extensionDoc : plugins.values()) {
            build(extensionDoc);
            classDoc.addClassExtension(extensionDoc);
        }
    }

    private void build(ClassExtensionDoc extensionDoc) {
        Document doc;
        try {

                                    DefaultPackagingRegistry.parseLifecyclePhaseDefinitions(plugins, name, phase);
                                    return plugins.values().stream().toList();
                                }
                                return List.of();
                            }

                            @Override

            parent.addChild(newDom(childName, childValue, location));
        }
    }

    private Xpp3Dom newDom(String name, String value, InputLocation location) {
        Xpp3Dom dom = new Xpp3Dom(name, location);
        dom.setValue(value);
        return dom;
    }

            // expected failure: wrong relative path calculation
            assertTrue(
                    afe.getMessage()
                            .contains(
                                    "Expected text value 'http://www.apache.org/path/to/parent/child-artifact-id/' but was "
                                            + "'http://www.apache.org/path/to/parent/../child-artifact-id/'"),
                    afe.getMessage());
        }

                allowEmpty = true,
            )
            text(
                "confirmationCode",
                "",
                label = "Confirmation Code",
                description = "Enter the value 'startCycle' (no quotes) to confirm the promotion",
                display = ParameterDisplay.PROMPT,
                allowEmpty = false,
            )
            text(
                "gitUserName",
                "",