## org.apache.solr.common.util
Class SimpleOrderedMap<T>

    java.lang.Object
      org.apache.solr.common.util.NamedList<T>
          org.apache.solr.common.util.SimpleOrderedMap<T>

All Implemented Interfaces:
  Serializable, Cloneable, Iterable<Map.Entry<String,T>>

    public class SimpleOrderedMap<T>

extends NamedList<T>

`SimpleOrderedMap` is a `NamedList` where access by key is more important than maintaining order when it comes to representing the held data in other forms, as ResponseWriters normally do. It's normally not a good idea to repeat keys or use null keys, but this is not enforced. If key uniqueness enforcement is desired, use a regular `Map`.

For example, a JSON response writer may choose to write a SimpleOrderedMap as {"foo":10,"bar":20} and may choose to write a NamedList as ["foo",10,"bar",20]. An XML response writer may choose to render both the same way.

This class does not provide efficient lookup by key, it's main purpose is to hold data to be serialized. It aims to minimize overhead and to be efficient at adding new elements.

See Also:
  Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.solr.common.util.NamedList
`NamedList.NamedListEntry<T>`

Field Summary

Fields inherited from class org.apache.solr.common.util.NamedList
`nvPairs`

Constructor Summary
`SimpleOrderedMap()` Creates an empty instance
`SimpleOrderedMap(List nameValuePairs)` Deprecated.
`SimpleOrderedMap(Map.Entry<String,T>[] nameValuePairs)`

Method Summary
`SimpleOrderedMap<T>` `clone()` Makes a shallow copy of the named list.

Methods inherited from class org.apache.solr.common.util.NamedList
`add, addAll, addAll, equals, get, get, getAll, getName, getVal, hashCode, indexOf, iterator, remove, remove, setName, setVal, size, toString`

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

Constructor Detail

### SimpleOrderedMap

    public SimpleOrderedMap()

  Creates an empty instance

### SimpleOrderedMap

    @Deprecated
    public SimpleOrderedMap(List nameValuePairs)

  Deprecated.

  Creates an instance backed by an explicitly specified list of pairwise names/values.

  Parameters:
    `nameValuePairs` - underlying List which should be used to implement a SimpleOrderedMap; modifying this List will affect the SimpleOrderedMap.

### SimpleOrderedMap

    public SimpleOrderedMap(Map.Entry<String,T>[] nameValuePairs)

Method Detail

### clone

    public SimpleOrderedMap<T> clone()

  Description copied from class: `NamedList`
  Makes a shallow copy of the named list.

  Overrides:
    `clone` in class `NamedList<T>`

Copyright © 2011 Apache Software Foundation. All Rights Reserved.