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CompositeDataSupport (Java Platform SE 6) - JDK 5 Documentation v6.0, Java 2 SDK 英文文档

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javax.management.openmbean
Class CompositeDataSupport

java.lang.Object
  extended by javax.management.openmbean.CompositeDataSupport
All Implemented Interfaces:
Serializable, CompositeData
public class CompositeDataSupport
extends Object
implements CompositeData, Serializable

The CompositeDataSupport class is the open data class which implements the CompositeData interface.

Since:
1.5
See Also:
Serialized Form

Constructor Summary
CompositeDataSupport(CompositeType compositeType, Map<String,?> items)
           Constructs a CompositeDataSupport instance with the specified compositeType, whose item names and corresponding values are given by the mappings in the map items.
CompositeDataSupport(CompositeType compositeType, String[] itemNames, Object[] itemValues)
           Constructs a CompositeDataSupport instance with the specified compositeType, whose item values are specified by itemValues[], in the same order as in itemNames[].
 
Method Summary
 boolean containsKey(String key)
          Returns true if and only if this CompositeData instance contains an item whose name is key.
 boolean containsValue(Object value)
          Returns true if and only if this CompositeData instance contains an item whose value is value.
 boolean equals(Object obj)
          Compares the specified obj parameter with this CompositeDataSupport instance for equality.
 Object get(String key)
          Returns the value of the item whose name is key.
 Object[] getAll(String[] keys)
          Returns an array of the values of the items whose names are specified by keys, in the same order as keys.
 CompositeType getCompositeType()
          Returns the composite type of this composite data instance.
 int hashCode()
          Returns the hash code value for this CompositeDataSupport instance.
 String toString()
          Returns a string representation of this CompositeDataSupport instance.
 Collection<?> values()
          Returns an unmodifiable Collection view of the item values contained in this CompositeData instance.
 
Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
 

Constructor Detail

CompositeDataSupport

public CompositeDataSupport(CompositeType compositeType,
                            String[] itemNames,
                            Object[] itemValues)
                     throws OpenDataException

Constructs a CompositeDataSupport instance with the specified compositeType, whose item values are specified by itemValues[], in the same order as in itemNames[]. As a CompositeType does not specify any order on its items, the itemNames[] parameter is used to specify the order in which the values are given in itemValues[]. The items contained in this CompositeDataSupport instance are internally stored in a TreeMap, thus sorted in ascending lexicographic order of their names, for faster retrieval of individual item values.

The constructor checks that all the constraints listed below for each parameter are satisfied, and throws the appropriate exception if they are not.

Parameters:
compositeType - the composite type of this composite data instance; must not be null.

itemNames - itemNames must list, in any order, all the item names defined in compositeType; the order in which the names are listed, is used to match values in itemValues[]; must not be null or empty.

itemValues - the values of the items, listed in the same order as their respective names in itemNames; each item value can be null, but if it is non-null it must be a valid value for the open type defined in compositeType for the corresponding item; must be of the same size as itemNames; must not be null or empty.

Throws:
IllegalArgumentException - compositeType is null, or itemNames[] or itemValues[] is null or empty, or one of the elements in itemNames[] is a null or empty string, or itemNames[] and itemValues[] are not of the same size.

OpenDataException - itemNames[] or itemValues[]'s size differs from the number of items defined in compositeType, or one of the elements in itemNames[] does not exist as an item name defined in compositeType, or one of the elements in itemValues[] is not a valid value for the corresponding item as defined in compositeType.

CompositeDataSupport

public CompositeDataSupport(CompositeType compositeType,
                            Map<String,?> items)
                     throws OpenDataException

Constructs a CompositeDataSupport instance with the specified compositeType, whose item names and corresponding values are given by the mappings in the map items. This constructor converts the keys to a string array and the values to an object array and calls CompositeDataSupport(javax.management.openmbean.CompositeType, java.lang.String[], java.lang.Object[]).

Parameters:
compositeType - the composite type of this composite data instance; must not be null.

items - the mappings of all the item names to their values; items must contain all the item names defined in compositeType; must not be null or empty.

Throws:
IllegalArgumentException - compositeType is null, or items is null or empty, or one of the keys in items is a null or empty string, or one of the values in items is null.

OpenDataException - items' size differs from the number of items defined in compositeType, or one of the keys in items does not exist as an item name defined in compositeType, or one of the values in items is not a valid value for the corresponding item as defined in compositeType.

ArrayStoreException - one or more keys in items is not of the class java.lang.String.

Method Detail

getCompositeType

public CompositeType getCompositeType()
Returns the composite type of this composite data instance.

Specified by:
getCompositeType in interface CompositeData
Returns:
the type of this CompositeData.

get

public Object get(String key)
Returns the value of the item whose name is key.

Specified by:
get in interface CompositeData
Parameters:
key - the name of the item.
Returns:
the value associated with this key.
Throws:
IllegalArgumentException - if key is a null or empty String.
InvalidKeyException - if key is not an existing item name for this CompositeData instance.

getAll

public Object[] getAll(String[] keys)
Returns an array of the values of the items whose names are specified by keys, in the same order as keys.

Specified by:
getAll in interface CompositeData
Parameters:
keys - the names of the items.
Returns:
the values corresponding to the keys.
Throws:
IllegalArgumentException - if an element in keys is a null or empty String.
InvalidKeyException - if an element in keys is not an existing item name for this CompositeData instance.

containsKey

public boolean containsKey(String key)
Returns true if and only if this CompositeData instance contains an item whose name is key. If key is a null or empty String, this method simply returns false.

Specified by:
containsKey in interface CompositeData
Parameters:
key - the key to be tested.
Returns:
true if this CompositeData contains the key.

containsValue

public boolean containsValue(Object value)
Returns true if and only if this CompositeData instance contains an item whose value is value.

Specified by:
containsValue in interface CompositeData
Parameters:
value - the value to be tested.
Returns:
true if this CompositeData contains the value.

values

public Collection<?> values()
Returns an unmodifiable Collection view of the item values contained in this CompositeData instance. The returned collection's iterator will return the values in the ascending lexicographic order of the corresponding item names.

Specified by:
values in interface CompositeData
Returns:
the values.

equals

public boolean equals(Object obj)
Compares the specified obj parameter with this CompositeDataSupport instance for equality.

Returns true if and only if all of the following statements are true:

  • obj is non null,
  • obj also implements the CompositeData interface,
  • their composite types are equal
  • their contents, i.e. (name, value) pairs are equal. If a value contained in the content is an array, the value comparison is done as if by calling the deepEquals method for arrays of object reference types or the appropriate overloading of Arrays.equals(e1,e2) for arrays of primitive types

This ensures that this equals method works properly for obj parameters which are different implementations of the CompositeData interface, with the restrictions mentioned in the equals method of the java.util.Collection interface.

Specified by:
equals in interface CompositeData
Overrides:
equals in class Object
Parameters:
obj - the object to be compared for equality with this CompositeDataSupport instance.
Returns:
true if the specified object is equal to this CompositeDataSupport instance.
See Also:
Object.hashCode(), Hashtable

hashCode

public int hashCode()
Returns the hash code value for this CompositeDataSupport instance.

The hash code of a CompositeDataSupport instance is the sum of the hash codes of all elements of information used in equals comparisons (ie: its composite type and all the item values).

This ensures that t1.equals(t2) implies that t1.hashCode()==t2.hashCode() for any two CompositeDataSupport instances t1 and t2, as required by the general contract of the method Object.hashCode().

Each item value's hash code is added to the returned hash code. If an item value is an array, its hash code is obtained as if by calling the deepHashCode method for arrays of object reference types or the appropriate overloading of Arrays.hashCode(e) for arrays of primitive types.

Specified by:
hashCode in interface CompositeData
Overrides:
hashCode in class Object
Returns:
the hash code value for this CompositeDataSupport instance
See Also:
Object.equals(java.lang.Object), Hashtable

toString

public String toString()
Returns a string representation of this CompositeDataSupport instance.

The string representation consists of the name of this class (ie javax.management.openmbean.CompositeDataSupport), the string representation of the composite type of this instance, and the string representation of the contents (ie list the itemName=itemValue mappings).

Specified by:
toString in interface CompositeData
Overrides:
toString in class Object
Returns:
a string representation of this CompositeDataSupport instance
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For further API reference and developer documentation, see Java SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

Copyright 2006 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.