当前页面: 在线文档首页 > JDK 5 Documentation v1.2.2, Java 2 SDK 英文文档

Java(TM) 2 Platform, Standard Edition, v1.2.2 API Specification: Class Attributes - JDK 5 Documentation v1.2.2, Java 2 SDK 英文文档

Overview  Package   Class  Use  Tree  Deprecated  Index  Help		JavaTM 2 Platform Standard Edition
PREV CLASS   NEXT CLASS	FRAMES    NO FRAMES
SUMMARY:  INNER | FIELD | CONSTR | METHOD	DETAIL:  FIELD | CONSTR | METHOD

---

java.util.jar
Class Attributes

java.lang.Object
  |
  +--java.util.jar.Attributes

---

public class Attributes

extends Object

implements Map, Cloneable

The Attributes class maps Manifest attribute names to associated string values. Attribute names are case-insensitive and restricted to the ASCII characters in the set [0-9a-zA-Z_-]. Attribute values can contain any characters and will be UTF8-encoded when written to the output stream.

Since:

JDK1.2

See Also:

Manifest

---

Inner Class Summary
static class	Attributes.Name           The Attributes.Name class represents an attribute name stored in this Map.

 

Inner classes inherited from class java.util.Map

Map.Entry

 

Field Summary
protected  Map	map           The attribute name-value mappings.

 

Constructor Summary

Attributes()           Constructs a new, empty Attributes object with default size.

Attributes(Attributes attr)           Constructs a new Attributes object with the same attribute name-value mappings as in the specified Attributes.

Attributes(int size)           Constructs a new, empty Attributes object with the specified initial size.

 

Method Summary
void	clear()           Removes all attributes from this Map.
Object	clone()           Returns a copy of the Attributes, implemented as follows:
boolean	containsKey(Object name)           Returns true if this Map contains the specified attribute name (key).
boolean	containsValue(Object value)           Returns true if this Map maps one or more attribute names (keys) to the specified value.
Set	entrySet()           Returns a Collection view of the attribute name-value mappings contained in this Map.
boolean	equals(Object o)           Compares the specified Attributes object with this Map for equality.
Object	get(Object name)           Returns the value of the specified attribute name, or null if the attribute name was not found.
String	getValue(Attributes.Name name)           Returns the value of the specified Attributes.Name, or null if the attribute was not found.
String	getValue(String name)           Returns the value of the specified attribute name, specified as a string, or null if the attribute was not found.
int	hashCode()           Returns the hash code value for this Map.
boolean	isEmpty()           Returns true if this Map contains no attributes.
Set	keySet()           Returns a Set view of the attribute names (keys) contained in this Map.
Object	put(Object name, Object value)           Associates the specified value with the specified attribute name (key) in this Map.
void	putAll(Map attr)           Copies all of the attribute name-value mappings from the specified Attributes to this Map.
String	putValue(String name, String value)           Associates the specified value with the specified attribute name, specified as a String.
Object	remove(Object name)           Removes the attribute with the specified name (key) from this Map.
int	size()           Returns the number of attributes in this Map.
Collection	values()           Returns a Collection view of the attribute values contained in this Map.

 

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, toString, wait, wait, wait

 

Field Detail

map

protected Map map

The attribute name-value mappings.

Constructor Detail

Attributes

public Attributes()

Constructs a new, empty Attributes object with default size.

---

Attributes

public Attributes(int size)

Constructs a new, empty Attributes object with the specified initial size.

Parameters:

size - the initial number of attributes

---

Attributes

public Attributes(Attributes attr)

Constructs a new Attributes object with the same attribute name-value mappings as in the specified Attributes.

Method Detail

get

public Object get(Object name)

Returns the value of the specified attribute name, or null if the attribute name was not found.

Specified by:

get in interface Map

Parameters:

name - the attribute name

---

getValue

public String getValue(String name)

Returns the value of the specified attribute name, specified as a string, or null if the attribute was not found. The attribute name is case-insensitive.

This method is defined as:

	    return (String)get(new Attributes.Name((String)name));
 

Parameters:

name - the attribute name as a string

---

getValue

public String getValue(Attributes.Name name)

Returns the value of the specified Attributes.Name, or null if the attribute was not found.

This method is defined as:

     return (String)get(name);
 

Parameters:

name - the Attributes.Name object

---

put

public Object put(Object name,
                  Object value)

Associates the specified value with the specified attribute name (key) in this Map. If the Map previously contained a mapping for the attribute name, the old value is replaced.

Specified by:

put in interface Map

Parameters:

name - the attribute name

value - the attribute value

Returns:

the previous value of the attribute, or null if none

Throws:

ClassCastException - if the name is not a Attributes.Name or the value is not a String

---

putValue

public String putValue(String name,
                       String value)

Associates the specified value with the specified attribute name, specified as a String. The attributes name is case-insensitive. If the Map previously contained a mapping for the attribute name, the old value is replaced.

This method is defined as:

	    return (String)put(new Attributes.Name(name), value);
 

Parameters:

the - attribute name as a string

value - the attribute value

Throws:

IllegalArgumentException - if the attribute name is invalid

---

remove

public Object remove(Object name)

Removes the attribute with the specified name (key) from this Map. Returns the previous attribute value, or null if none.

Specified by:

remove in interface Map

Parameters:

name - attribute name

---

containsValue

public boolean containsValue(Object value)

Returns true if this Map maps one or more attribute names (keys) to the specified value.

Specified by:

containsValue in interface Map

Parameters:

value - the attribute value

---

containsKey

public boolean containsKey(Object name)

Returns true if this Map contains the specified attribute name (key).

Specified by:

containsKey in interface Map

Parameters:

name - the attribute name

---

putAll

public void putAll(Map attr)

Copies all of the attribute name-value mappings from the specified Attributes to this Map. Duplicate mappings will be replaced.

Specified by:

putAll in interface Map

Parameters:

attr - the Attributes to be stored in this map

Throws:

IllegalArgumentException - if attr is not a Attributes instance

---

clear

public void clear()

Removes all attributes from this Map.

Specified by:

clear in interface Map

Tags copied from interface: Map

Throws:

UnsupportedOperationException - clear is not supported by this map.

---

size

public int size()

Returns the number of attributes in this Map.

Specified by:

size in interface Map

Tags copied from interface: Map

Returns:

the number of key-value mappings in this map.

---

isEmpty

public boolean isEmpty()

Returns true if this Map contains no attributes.

Specified by:

isEmpty in interface Map

Tags copied from interface: Map

Returns:

true if this map contains no key-value mappings.

---

keySet

public Set keySet()

Returns a Set view of the attribute names (keys) contained in this Map.

Specified by:

keySet in interface Map

Tags copied from interface: Map

Returns:

a set view of the keys contained in this map.

---

values

public Collection values()

Returns a Collection view of the attribute values contained in this Map.

Specified by:

values in interface Map

Tags copied from interface: Map

Returns:

a collection view of the values contained in this map.

---

entrySet

public Set entrySet()

Returns a Collection view of the attribute name-value mappings contained in this Map.

Specified by:

entrySet in interface Map

Tags copied from interface: Map

Returns:

a set view of the mappings contained in this map.

---

equals

public boolean equals(Object o)

Compares the specified Attributes object with this Map for equality. Returns true if the given object is also an instance of Attributes and the two Attributes objects represent the same mappings.

Specified by:

equals in interface Map

Overrides:

equals in class Object

Parameters:

o - the Object to be compared

Returns:

true if the specified Object is equal to this Map

---

hashCode

public int hashCode()

Returns the hash code value for this Map.

Specified by:

hashCode in interface Map

Overrides:

hashCode in class Object

Tags copied from interface: Map

Returns:

the hash code value for this map.

See Also:

Map.Entry.hashCode(), Object.hashCode(), Object.equals(Object), Map.equals(Object)

---

clone

public Object clone()

Returns a copy of the Attributes, implemented as follows:

     public Object clone() { return new Attributes(this); }
 

Since the attribute names and values are themselves immutable, the Attributes returned can be safely modified without affecting the original.

Overrides:

clone in class Object

Tags copied from class: Object

Returns:

a clone of this instance.

Throws:

CloneNotSupportedException - if the object's class does not support the Cloneable interface. Subclasses that override the clone method can also throw this exception to indicate that an instance cannot be cloned.

OutOfMemoryError - if there is not enough memory.

See Also:

Cloneable

---

Overview  Package   Class  Use  Tree  Deprecated  Index  Help		JavaTM 2 Platform Standard Edition
PREV CLASS   NEXT CLASS	FRAMES    NO FRAMES
SUMMARY:  INNER | FIELD | CONSTR | METHOD	DETAIL:  FIELD | CONSTR | METHOD

---

Submit a bug or feature
Java, Java 2D, and JDBC are a trademarks or registered trademarks of Sun Microsystems, Inc. in the US and other countries.
Copyright 1993-1999 Sun Microsystems, Inc. 901 San Antonio Road,
Palo Alto, California, 94303, U.S.A. All Rights Reserved.