org.apache.lucene.queryparser.flexible.core.config

## Class AbstractQueryConfig

- java.lang.Object
- - org.apache.lucene.queryparser.flexible.core.config.AbstractQueryConfig

- Direct Known Subclasses:
    FieldConfig, QueryConfigHandler

      public abstract class AbstractQueryConfig
      extends Object

  This class is the base of `QueryConfigHandler` and `FieldConfig`. It has operations to set, unset and get configuration values.

  Each configuration is is a key->value pair. The key should be an unique `ConfigurationKey` instance and it also holds the value's type.

  See Also:
    `ConfigurationKey`

- - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `<T> T` | `get(ConfigurationKey<T> key)` Returns the value held by the given key.
    `<T> boolean` | `has(ConfigurationKey<T> key)` Returns true if there is a value set with the given key, otherwise false.
    `<T> void` | `set(ConfigurationKey<T> key, T value)` Sets a key and its value.
    `<T> boolean` | `unset(ConfigurationKey<T> key)` Unsets the given key and its value.

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Method Detail

    - #### get

          public <T> T get(ConfigurationKey<T> key)

      Returns the value held by the given key.
      Type Parameters:
        `T` - the value's type
      Parameters:
        `key` - the key, cannot be `null`
      Returns:
        the value held by the given key

    - #### has

          public <T> boolean has(ConfigurationKey<T> key)

      Returns true if there is a value set with the given key, otherwise false.
      Type Parameters:
        `T` - the value's type
      Parameters:
        `key` - the key, cannot be `null`
      Returns:
        true if there is a value set with the given key, otherwise false

    - #### set

          public <T> void set(ConfigurationKey<T> key,
                     T value)

      Sets a key and its value.
      Type Parameters:
        `T` - the value's type
      Parameters:
        `key` - the key, cannot be `null`
        `value` - value to set

    - #### unset

          public <T> boolean unset(ConfigurationKey<T> key)

      Unsets the given key and its value.
      Type Parameters:
        `T` - the value's type
      Parameters:
        `key` - the key
      Returns:
        true if the key and value was set and removed, otherwise false

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