Package org.gradle.api.provider

## Interface MapProperty<K,​V>

- Type Parameters:
    `K` - the type of keys.
    `V` - the type of values.
  All Superinterfaces:
    `HasConfigurableValue`, `Provider<java.util.Map<K,​V>>`, `SupportsConvention`

      @SupportsKotlinAssignmentOverloading
      public interface MapProperty<K,​V>
      extends Provider<java.util.Map<K,​V>>, HasConfigurableValue, SupportsConvention

  Represents a property whose type is a `Map` of keys of type `MapProperty` and values of type `MapProperty`. Retains iteration order.

  You can create a `MapProperty` instance using factory method `ObjectFactory.mapProperty(Class, Class)`.

  Note: This interface is not intended for implementation by build script or plugin authors.

  Since:
    5.1

- - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method | Description
    --- | --- | ---
    `MapProperty<K,​V>` | `convention​(java.util.Map<? extends K,​? extends V> value)` | Specifies the value to use as the convention for this property.
    `MapProperty<K,​V>` | `convention​(Provider<? extends java.util.Map<? extends K,​? extends V>> valueProvider)` | Specifies the provider of the value to use as the convention for this property.
    `MapProperty<K,​V>` | `empty()` | Sets the value of this property to an empty map, and replaces any existing value.
    `void` | `finalizeValue()` | Disallows further changes to the value of this property.
    `Provider<V>` | `getting​(K key)` | Returns a provider that resolves to the value of the mapping of the given key.
    `Provider<java.util.Set<K>>` | `keySet()` | Returns a `Provider` that returns the set of keys for the map that is the property value.
    `void` | `put​(K key, Provider<? extends V> providerOfValue)` | Adds a map entry to the property value.
    `void` | `put​(K key, V value)` | Adds a map entry to the property value.
    `void` | `putAll​(java.util.Map<? extends K,​? extends V> entries)` | Adds all entries from another `Map` to the property value.
    `void` | `putAll​(Provider<? extends java.util.Map<? extends K,​? extends V>> provider)` | Adds all entries from another `Map` to the property value.
    `void` | `set​(java.util.Map<? extends K,​? extends V> entries)` | Sets the value of this property to the entries of the given Map, and replaces any existing value.
    `void` | `set​(Provider<? extends java.util.Map<? extends K,​? extends V>> provider)` | Sets the property to have the same value of the given provider, and replaces any existing value.
    `MapProperty<K,​V>` | `unset()` | Unsets this object's explicit value, allowing the convention to be selected when evaluating this object's value.
    `MapProperty<K,​V>` | `unsetConvention()` | Unsets this object's convention value.
    `MapProperty<K,​V>` | `value​(java.util.Map<? extends K,​? extends V> entries)` | Sets the value of this property to the entries of the given Map, and replaces any existing value.
    `MapProperty<K,​V>` | `value​(Provider<? extends java.util.Map<? extends K,​? extends V>> provider)` | Sets the property to have the same value of the given provider, and replaces any existing value.

    - ### Methods inherited from interface org.gradle.api.provider.HasConfigurableValue

      `disallowChanges, disallowUnsafeRead, finalizeValueOnRead`

    - ### Methods inherited from interface org.gradle.api.provider.Provider

      `filter, flatMap, forUseAtConfigurationTime, get, getOrElse, getOrNull, isPresent, map, orElse, orElse, zip`

- - ### Method Detail

    - #### empty

          MapProperty<K,​V> empty()

      Sets the value of this property to an empty map, and replaces any existing value.
      Returns:
        this property.

    - #### getting

          Provider<V> getting​(K key)

      Returns a provider that resolves to the value of the mapping of the given key. It will have no value if the property has no value, or if it does not contain a mapping for the key.

      The returned provider will track the value of this property and query its value when it is queried.

      This method is equivalent to

               map(m -> m.get(key))

      but possibly more efficient.
      Parameters:
        `key` - the key
      Returns:
        a `Provider` for the value

    - #### set

          void set​(@Nullable
                   java.util.Map<? extends K,​? extends V> entries)

      Sets the value of this property to the entries of the given Map, and replaces any existing value. This property will query the entries of the map each time the value of this property is queried.

      This method can also be used to discard the value of the property, by passing `null` as the value. The convention for this property, if any, will be used to provide the value instead.

      Parameters:
        `entries` - the entries, can be `null`

    - #### set

          void set​(Provider<? extends java.util.Map<? extends K,​? extends V>> provider)

      Sets the property to have the same value of the given provider, and replaces any existing value. This property will track the value of the provider and query its value each time the value of this property is queried. When the provider has no value, this property will also have no value.
      Parameters:
        `provider` - Provider of the entries.

    - #### value

          MapProperty<K,​V> value​(@Nullable
                                       java.util.Map<? extends K,​? extends V> entries)

      Sets the value of this property to the entries of the given Map, and replaces any existing value. This property will query the entries of the map each time the value of this property is queried.

      This is the same as `set(Map)` but returns this property to allow method chaining.

      Parameters:
        `entries` - the entries, can be `null`
      Returns:
        this
      Since:
        5.6

    - #### value

          MapProperty<K,​V> value​(Provider<? extends java.util.Map<? extends K,​? extends V>> provider)

      Sets the property to have the same value of the given provider, and replaces any existing value. This property will track the value of the provider and query its value each time the value of this property is queried. When the provider has no value, this property will also have no value.

      This is the same as `set(Provider)` but returns this property to allow method chaining.

      Parameters:
        `provider` - Provider of the entries.
      Since:
        5.6

    - #### put

          void put​(K key,
                   V value)

      Adds a map entry to the property value.
      Parameters:
        `key` - the key
        `value` - the value

    - #### put

          void put​(K key,
                   Provider<? extends V> providerOfValue)

      Adds a map entry to the property value.

      The given provider will be queried when the value of this property is queried. This property will have no value when the given provider has no value.

      Parameters:
        `key` - the key
        `providerOfValue` - the provider of the value

    - #### putAll

          void putAll​(java.util.Map<? extends K,​? extends V> entries)

      Adds all entries from another `Map` to the property value.
      Parameters:
        `entries` - a `Map` containing the entries to add

    - #### putAll

          void putAll​(Provider<? extends java.util.Map<? extends K,​? extends V>> provider)

      Adds all entries from another `Map` to the property value.

      The given provider will be queried when the value of this property is queried. This property will have no value when the given provider has no value.

      Parameters:
        `provider` - the provider of the entries

    - #### keySet

          Provider<java.util.Set<K>> keySet()

      Returns a `Provider` that returns the set of keys for the map that is the property value.

      The returned provider will track the value of this property and query its value when it is queried.

      This method is equivalent to

               map(m -> m.keySet())

      but possibly more efficient.
      Returns:
        a `Provider` that provides the set of keys for the map

    - #### convention

          MapProperty<K,​V> convention​(@Nullable
                                            java.util.Map<? extends K,​? extends V> value)

      Specifies the value to use as the convention for this property. The convention is used when no value has been set for this property.
      Parameters:
        `value` - The value, or `null` when the convention is that the property has no value.
      Returns:
        this

    - #### convention

          MapProperty<K,​V> convention​(Provider<? extends java.util.Map<? extends K,​? extends V>> valueProvider)

      Specifies the provider of the value to use as the convention for this property. The convention is used when no value has been set for this property.
      Parameters:
        `valueProvider` - The provider of the value.
      Returns:
        this

    - #### unset

          @Incubating
          MapProperty<K,​V> unset()

      Unsets this object's explicit value, allowing the convention to be selected when evaluating this object's value.

      This is similar to calling `value(Map)` with a `null` argument.

      Specified by:
        `unset` in interface `SupportsConvention`

    - #### unsetConvention

          @Incubating
          MapProperty<K,​V> unsetConvention()

      Unsets this object's convention value.

      This is similar to calling `convention(Map)` with a `null` argument.

      Specified by:
        `unsetConvention` in interface `SupportsConvention`

    - #### finalizeValue

          void finalizeValue()

      Disallows further changes to the value of this property. Calls to methods that change the value of this property, such as `set(Map)` or `put(Object, Object)` will fail.

      When this property has elements provided by a `Provider`, the value of the provider is queried when this method is called and the value of the provider will no longer be tracked.

      Note that although the value of the property will not change, the resulting map may contain mutable objects. Calling this method does not guarantee that the value will become immutable.

      Specified by:
        `finalizeValue` in interface `HasConfigurableValue`