},
	}, {
		desc: "no providers",
		in: &apiserver.EncryptionConfiguration{
			Resources: []apiserver.ResourceConfiguration{{
				Resources: []string{"secrets"},
			}},
		},
		want: field.ErrorList{
			field.Required(firstResourcePath.Child("providers"), fmt.Sprintf(atLeastOneRequiredErrFmt, root.Index(0).Child("providers"))),
		},
	}, {
		desc: "multiple providers",
		in: &apiserver.EncryptionConfiguration{

        description | value
        'Provider'  | Providers.notDefined()
        'Provider in Callable'      | { -> Providers.notDefined() }
    }

    def "unpack of #description fails"() {
        when:
        DeferredUtil.unpack(value)
        then:
        thrown(MissingValueException)

        where:
        description            | value
        'Provider'             | Providers.notDefined()

    }

    def "queries underlying provider for every call to get()"() {
        def provider = Stub(ProviderInternal)
        provider.type >> List
        provider.calculateValue(_) >>> [["123"], ["abc"]].collect { ValueSupplier.Value.of(it) }
        provider.calculatePresence(_) >> true

        expect:
        property.set(provider)
        assertValueIs(["123"])
        assertValueIs(["abc"])

 */

package org.gradle.api.internal.provider;

import org.gradle.api.Transformer;
import org.gradle.api.provider.Provider;

import javax.annotation.Nullable;

public class FlatMapProvider<S, T> extends AbstractMinimalProvider<S> {
    private final ProviderInternal<? extends T> provider;
    private final Transformer<? extends Provider<? extends S>, ? super T> transformer;

{
  "kind": "EncryptionConfiguration",
  "apiVersion": "apiserver.config.k8s.io/v1",
  "resources": [
    {
      "resources": [
        "ignored"
      ],
      "providers": [
        {
          "aescbc": {
            "keys": [
              {
                "name": "2",
                "secret": "+qcnfOFX3aRXM9PuY7lQXDWYIQ3GWUdBc3nYBo91SCA="
              }
            ]
          }
        },
        {

Providers are used to model values that may be computed lazily in your build scripts.

The `ProviderFactory` interface provides methods for creating various types of providers, including:

- `provider(Callable<T> value)` to create a provider with a value that is lazily computed based on a `Callable`.
- `provider(Provider<T> value)` to create a provider that simply wraps an existing provider.

import org.gradle.api.configuration.BuildFeatures;
import org.gradle.api.internal.StartParameterInternal;
import org.gradle.api.internal.provider.ProviderInternal;
import org.gradle.api.internal.provider.Providers;
import org.gradle.api.provider.Provider;
import org.gradle.internal.buildoption.Option;
import org.gradle.internal.buildtree.BuildModelParameters;
import org.gradle.internal.lazy.Lazy;

        then:
        zipped instanceof Provider
        !zipped.isPresent()
        zipped.getOrNull() == null
    }

    def "can zip two providers and use null to remove the value, and it is live"() {
        def provider = withValues("accepted", "accepted", "rejected", "rejected")
        def second = providerFactory.provider { "value" }

        when:
        def zipped = providerFactory.zip(provider, second) { s1, s2 ->

                @Override
                String apply(String a, String b) {
                    return provider.get()
                }

                @Override
                String toString() {
                    return "BiFunction with $provider"
                }
            }
            transform.provider = new BiProvider(String, Providers.of("A"), Providers.of("B"), transform)

private static String getUserGroup(); public static String getUserName(); } META-INF/maven/org.apache.maven.wagon/wagon-provider-api/pom.xml wagon org.apache.maven.wagon 1.0-beta-2 4.0.0 wagon-provider-api Maven Wagon API Maven Wagon API that defines the contract between different Wagon implementations org.codehaus.plexus plexus-utils META-INF/maven/org.apache.maven.wagon/wagon-provider-api/pom.properties #Generated by Maven #Tue Dec 12 17:05:59 EST 2006 version=1.0-beta-2 groupId=org.apache.maven.wagon...