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## org.springframework.beans.propertyeditors
Class CustomMapEditor

    java.lang.Object
      java.beans.PropertyEditorSupport
          org.springframework.beans.propertyeditors.CustomMapEditor

All Implemented Interfaces:
  PropertyEditor

    public class CustomMapEditor

extends PropertyEditorSupport

Property editor for Maps, converting any source Map to a given target Map type.

Since:
  2.0.1
Author:
  Juergen Hoeller
See Also:
  `Map`, `SortedMap`

Constructor Summary
`CustomMapEditor(Class mapType)` Create a new CustomMapEditor for the given target type, keeping an incoming `null` as-is.
`CustomMapEditor(Class mapType, boolean nullAsEmptyMap)` Create a new CustomMapEditor for the given target type.

Method Summary
`protected boolean` | `alwaysCreateNewMap()` Return whether to always create a new Map, even if the type of the passed-in Map already matches.
`protected Object` | `convertKey(Object key)` Hook to convert each encountered Map key.
`protected Object` | `convertValue(Object value)` Hook to convert each encountered Map value.
`protected Map` | `createMap(Class mapType, int initialCapacity)` Create a Map of the given type, with the given initial capacity (if supported by the Map type).
`String` | `getAsText()` This implementation returns `null` to indicate that there is no appropriate text representation.
`void` | `setAsText(String text)` Convert the given text value to a Map with a single element.
`void` | `setValue(Object value)` Convert the given value to a Map of the target type.

Methods inherited from class java.beans.PropertyEditorSupport
`addPropertyChangeListener, firePropertyChange, getCustomEditor, getJavaInitializationString, getSource, getTags, getValue, isPaintable, paintValue, removePropertyChangeListener, setSource, supportsCustomEditor`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### CustomMapEditor

    public CustomMapEditor(Class mapType)

  Create a new CustomMapEditor for the given target type, keeping an incoming `null` as-is.

  Parameters:
    `mapType` - the target type, which needs to be a sub-interface of Map or a concrete Map class
  See Also:
    `Map`, `HashMap`, `TreeMap`, `LinkedHashMap`

### CustomMapEditor

    public CustomMapEditor(Class mapType,
                           boolean nullAsEmptyMap)

  Create a new CustomMapEditor for the given target type.

  If the incoming value is of the given type, it will be used as-is. If it is a different Map type or an array, it will be converted to a default implementation of the given Map type. If the value is anything else, a target Map with that single value will be created.

  The default Map implementations are: TreeMap for SortedMap, and LinkedHashMap for Map.

  Parameters:
    `mapType` - the target type, which needs to be a sub-interface of Map or a concrete Map class
    `nullAsEmptyMap` - ap whether to convert an incoming `null` value to an empty Map (of the appropriate type)
  See Also:
    `Map`, `TreeMap`, `LinkedHashMap`

Method Detail

### setAsText

    public void setAsText(String text)
                   throws IllegalArgumentException

  Convert the given text value to a Map with a single element.

  Specified by:
    `setAsText` in interface `PropertyEditor`
  Overrides:
    `setAsText` in class `PropertyEditorSupport`
  Throws:
    `IllegalArgumentException`

### setValue

    public void setValue(Object value)

  Convert the given value to a Map of the target type.

  Specified by:
    `setValue` in interface `PropertyEditor`
  Overrides:
    `setValue` in class `PropertyEditorSupport`

### createMap

    protected Map createMap(Class mapType,
                            int initialCapacity)

  Create a Map of the given type, with the given initial capacity (if supported by the Map type).

  Parameters:
    `mapType` - a sub-interface of Map
    `initialCapacity` - the initial capacity
  Returns:
    the new Map instance

### alwaysCreateNewMap

    protected boolean alwaysCreateNewMap()

  Return whether to always create a new Map, even if the type of the passed-in Map already matches.

  Default is "false"; can be overridden to enforce creation of a new Map, for example to convert elements in any case.

  See Also:
    `convertKey(java.lang.Object)`, `convertValue(java.lang.Object)`

### convertKey

    protected Object convertKey(Object key)

  Hook to convert each encountered Map key. The default implementation simply returns the passed-in key as-is.

  Can be overridden to perform conversion of certain keys, for example from String to Integer.

  Only called if actually creating a new Map! This is by default not the case if the type of the passed-in Map already matches. Override `alwaysCreateNewMap()` to enforce creating a new Map in every case.

  Parameters:
    `key` - the source key
  Returns:
    the key to be used in the target Map
  See Also:
    `alwaysCreateNewMap()`

### convertValue

    protected Object convertValue(Object value)

  Hook to convert each encountered Map value. The default implementation simply returns the passed-in value as-is.

  Can be overridden to perform conversion of certain values, for example from String to Integer.

  Only called if actually creating a new Map! This is by default not the case if the type of the passed-in Map already matches. Override `alwaysCreateNewMap()` to enforce creating a new Map in every case.

  Parameters:
    `value` - the source value
  Returns:
    the value to be used in the target Map
  See Also:
    `alwaysCreateNewMap()`

### getAsText

    public String getAsText()

  This implementation returns `null` to indicate that there is no appropriate text representation.

  Specified by:
    `getAsText` in interface `PropertyEditor`
  Overrides:
    `getAsText` in class `PropertyEditorSupport`

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