- java.lang.Object
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- javax.management.ImmutableDescriptor
 
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- All Implemented Interfaces:
- Serializable,- Cloneable,- Descriptor
 
 public class ImmutableDescriptor extends Object implements Descriptor An immutable descriptor.- Since:
- 1.6
- See Also:
- Serialized Form
 
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Field SummaryFields Modifier and Type Field Description static ImmutableDescriptorEMPTY_DESCRIPTORAn empty descriptor.
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Constructor SummaryConstructors Constructor Description ImmutableDescriptor(String... fields)Construct a descriptor containing the given fields.ImmutableDescriptor(String[] fieldNames, Object[] fieldValues)Construct a descriptor containing the given fields and values.ImmutableDescriptor(Map<String,?> fields)Construct a descriptor where the names and values of the fields are the keys and values of the given Map.
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Method SummaryAll Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description Descriptorclone()Returns a descriptor which is equal to this descriptor.booleanequals(Object o)Compares this descriptor to the given object.inthashCode()Returns the hash code value for this descriptor.booleanisValid()Returns true if all of the fields have legal values given their names.voidremoveField(String fieldName)Removes a field from the descriptor.voidsetField(String fieldName, Object fieldValue)This operation is unsupported since this class is immutable.voidsetFields(String[] fieldNames, Object[] fieldValues)This operation is unsupported since this class is immutable.static ImmutableDescriptorunion(Descriptor... descriptors)Return anImmutableDescriptorwhose contents are the union of the given descriptors.- 
Methods declared in class java.lang.Objectfinalize, getClass, notify, notifyAll, toString, wait, wait, wait
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Methods declared in interface javax.management.DescriptorgetFieldNames, getFields, getFieldValue, getFieldValues
 
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Field Detail- 
EMPTY_DESCRIPTORpublic static final ImmutableDescriptor EMPTY_DESCRIPTOR An empty descriptor.
 
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Constructor Detail- 
ImmutableDescriptorpublic ImmutableDescriptor(String[] fieldNames, Object[] fieldValues) Construct a descriptor containing the given fields and values.- Parameters:
- fieldNames- the field names
- fieldValues- the field values
- Throws:
- IllegalArgumentException- if either array is null, or if the arrays have different sizes, or if a field name is null or empty, or if the same field name appears more than once.
 
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ImmutableDescriptorpublic ImmutableDescriptor(String... fields) Construct a descriptor containing the given fields. Each String must be of the formfieldName=fieldValue. The field name ends at the first=character; for example if the String isa=b=cthen the field name isaand its value isb=c.- Parameters:
- fields- the field names
- Throws:
- IllegalArgumentException- if the parameter is null, or if a field name is empty, or if the same field name appears more than once, or if one of the strings does not contain an- =character.
 
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ImmutableDescriptorpublic ImmutableDescriptor(Map<String,?> fields) Construct a descriptor where the names and values of the fields are the keys and values of the given Map. - Parameters:
- fields- the field names and values
- Throws:
- IllegalArgumentException- if the parameter is null, or if a field name is null or empty, or if the same field name appears more than once (which can happen because field names are not case sensitive).
 
 
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Method Detail- 
unionpublic static ImmutableDescriptor union(Descriptor... descriptors) Return an ImmutableDescriptorwhose contents are the union of the given descriptors. Every field name that appears in any of the descriptors will appear in the result with the value that it has when the method is called. Subsequent changes to any of the descriptors do not affect the ImmutableDescriptor returned here.In the simplest case, there is only one descriptor and the returned ImmutableDescriptoris a copy of its fields at the time this method is called:Descriptor d = something(); ImmutableDescriptor copy = ImmutableDescriptor.union(d); - Parameters:
- descriptors- the descriptors to be combined. Any of the descriptors can be null, in which case it is skipped.
- Returns:
- an ImmutableDescriptorthat is the union of the given descriptors. The returned object may be identical to one of the input descriptors if it is an ImmutableDescriptor that contains all of the required fields.
- Throws:
- IllegalArgumentException- if two Descriptors contain the same field name with different associated values. Primitive array values are considered the same if they are of the same type with the same elements. Object array values are considered the same if- Arrays.deepEquals(Object[],Object[])returns true.
 
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equalspublic boolean equals(Object o) Compares this descriptor to the given object. The objects are equal if the given object is also a Descriptor, and if the two Descriptors have the same field names (possibly differing in case) and the same associated values. The respective values for a field in the two Descriptors are equal if the following conditions hold:- If one value is null then the other must be too.
- If one value is a primitive array then the other must be a primitive array of the same type with the same elements.
- If one value is an object array then the other must be too and
 Arrays.deepEquals(Object[],Object[])must return true.
- Otherwise Object.equals(Object)must return true.
 - Specified by:
- equalsin interface- Descriptor
- Overrides:
- equalsin class- Object
- Parameters:
- o- the object to compare with.
- Returns:
- trueif the objects are the same;- falseotherwise.
- See Also:
- Object.hashCode(),- HashMap
 
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hashCodepublic int hashCode() Returns the hash code value for this descriptor. The hash code is computed as the sum of the hash codes for each field in the descriptor. The hash code of a field with name nand valuevisn.toLowerCase().hashCode() ^ h. Herehis the hash code ofv, computed as follows:- If vis null thenhis 0.
- If vis a primitive array thenhis computed using the appropriate overloading ofjava.util.Arrays.hashCode.
- If vis an object array thenhis computed usingArrays.deepHashCode(Object[]).
- Otherwise hisv.hashCode().
 - Specified by:
- hashCodein interface- Descriptor
- Overrides:
- hashCodein class- Object
- Returns:
- A hash code value for this object.
- See Also:
- Object.equals(java.lang.Object),- System.identityHashCode(java.lang.Object)
 
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isValidpublic boolean isValid() Returns true if all of the fields have legal values given their names. This method always returns true, but a subclass can override it to return false when appropriate.- Specified by:
- isValidin interface- Descriptor
- Returns:
- true if the values are legal.
- Throws:
- RuntimeOperationsException- if the validity checking fails. The method returns false if the descriptor is not valid, but throws this exception if the attempt to determine validity fails.
 
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clonepublic Descriptor clone() Returns a descriptor which is equal to this descriptor. Changes to the returned descriptor will have no effect on this descriptor, and vice versa. This method returns the object on which it is called. A subclass can override it to return another object provided the contract is respected. - Specified by:
- clonein interface- Descriptor
- Overrides:
- clonein class- Object
- Returns:
- a clone of this instance.
- Throws:
- RuntimeOperationsException- for illegal value for field Names or field Values. If the descriptor construction fails for any reason, this exception will be thrown.
- See Also:
- Cloneable
 
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setFieldspublic final void setFields(String[] fieldNames, Object[] fieldValues) throws RuntimeOperationsException This operation is unsupported since this class is immutable. If this call would change a mutable descriptor with the same contents, then aRuntimeOperationsExceptionwrapping anUnsupportedOperationExceptionis thrown. Otherwise, the behavior is the same as it would be for a mutable descriptor: either an exception is thrown because of illegal parameters, or there is no effect.- Specified by:
- setFieldsin interface- Descriptor
- Parameters:
- fieldNames- String array of field names. The array and array elements cannot be null.
- fieldValues- Object array of the corresponding field values. The array cannot be null. Elements of the array can be null.
- Throws:
- RuntimeOperationsException- if the change fails for any reason. Wrapped exception is- IllegalArgumentExceptionif- fieldNamesor- fieldValuesis null, or if the arrays are of different lengths, or if there is an illegal value in one of them. Wrapped exception is- UnsupportedOperationExceptionif the descriptor is immutable, and the call would change its contents.
- See Also:
- Descriptor.getFields()
 
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setFieldpublic final void setField(String fieldName, Object fieldValue) throws RuntimeOperationsException This operation is unsupported since this class is immutable. If this call would change a mutable descriptor with the same contents, then aRuntimeOperationsExceptionwrapping anUnsupportedOperationExceptionis thrown. Otherwise, the behavior is the same as it would be for a mutable descriptor: either an exception is thrown because of illegal parameters, or there is no effect.- Specified by:
- setFieldin interface- Descriptor
- Parameters:
- fieldName- The field name to be set. Cannot be null or empty.
- fieldValue- The field value to be set for the field name. Can be null if that is a valid value for the field.
- Throws:
- RuntimeOperationsException- if the field name or field value is illegal (wrapped exception is- IllegalArgumentException); or if the descriptor is immutable (wrapped exception is- UnsupportedOperationException).
 
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removeFieldpublic final void removeField(String fieldName) Removes a field from the descriptor.- Specified by:
- removeFieldin interface- Descriptor
- Parameters:
- fieldName- String name of the field to be removed. If the field name is illegal or the field is not found, no exception is thrown.
- Throws:
- RuntimeOperationsException- if a field of the given name exists and the descriptor is immutable. The wrapped exception will be an- UnsupportedOperationException.
 
 
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