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## org.apache.lucene.queryParser.core.config
Class AbstractQueryConfig

    java.lang.Object
      org.apache.lucene.util.AttributeSource
          org.apache.lucene.queryParser.core.config.AbstractQueryConfig

Direct Known Subclasses:
  FieldConfig, QueryConfigHandler

    public abstract class AbstractQueryConfig

extends org.apache.lucene.util.AttributeSource

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.

NOTE: in future this class will no longer extend `AttributeSource`

See Also:
  `ConfigurationKey`

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.lucene.util.AttributeSource
`org.apache.lucene.util.AttributeSource.AttributeFactory, org.apache.lucene.util.AttributeSource.State`

Method Summary
`
`<A extends org.apache.lucene.util.Attribute> A`
` | `addAttribute(Class<A> attClass)`
`
`<T> T`
` | `get(ConfigurationKey<T> key)` Returns the value held by the given key.
`
`<T> T`
` | `get(ConfigurationKey<T> key, T defaultValue)` Returns the value held by the given key or the given default value if the key is not found.
`
`<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 org.apache.lucene.util.AttributeSource
`addAttributeImpl, captureState, clearAttributes, cloneAttributes, copyTo, equals, getAttribute, getAttributeClassesIterator, getAttributeFactory, getAttributeImplsIterator, hasAttribute, hasAttributes, hashCode, reflectAsString, reflectWith, restoreState, toString`

Methods inherited from class java.lang.Object
`clone, finalize, getClass, notify, notifyAll, 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

### get

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

  Returns the value held by the given key or the given default value if the key is not found.

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

### 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` - @param 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` -

### addAttribute

    public <A extends org.apache.lucene.util.Attribute> A addAttribute(Class<A> attClass)

  Overrides:
    `addAttribute` in class `org.apache.lucene.util.AttributeSource`

### 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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