Attributes (Java Platform SE 8 )

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

All Implemented Interfaces:

Cloneable, Map<Object,Object>
```
public class Attributes
extends Object
implements Map<Object,Object>, Cloneable
```
The Attributes class maps Manifest attribute names to associated string values. Valid attribute names are case-insensitive, are restricted to the ASCII characters in the set [0-9a-zA-Z_-], and cannot exceed 70 characters in length. Attribute values can contain any characters and will be UTF8-encoded when written to the output stream. See the JAR File Specification for more information about valid attribute names and values.

Since:

1.2

See Also:

Manifest

Nested Class Summary

Nested Classes
Modifier and Type Class Description

static class Attributes.Name
The Attributes.Name class represents an attribute name stored in this Map.
- Nested classes/interfaces inherited from interface java.util.Map
  Map.Entry<K,V>

Nested Classes
Modifier and Type	Class	Description
`static class`	`Attributes.Name`	The Attributes.Name class represents an attribute name stored in this Map.

Field Summary

Fields
Modifier and Type Field Description

protected Map<Object,Object> map
The attribute name-value mappings.

Fields
Modifier and Type	Field	Description
`protected Map<Object,Object>`	`map`	The attribute name-value mappings.

Constructor Summary

Constructors
Constructor	Description
`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

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`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<Map.Entry<Object,Object>>`	`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<Object>`	`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<Object>`	`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

Methods inherited from interface java.util.Map
compute, computeIfAbsent, computeIfPresent, forEach, getOrDefault, merge, putIfAbsent, remove, replace, replace, replaceAll

- Field Detail
  - map
```
protected Map<Object,Object> 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.
    
    Parameters:
    
    attr - 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<Object,Object>
    
    Parameters:
    
    name - the attribute name
    
    Returns:
    
    the value of the specified attribute name, or null if not found.
  - 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
    
    Returns:
    
    the String value of the specified attribute name, or null if not found.
    
    Throws:
    
    IllegalArgumentException - if the attribute name is invalid
  - 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
    
    Returns:
    
    the String value of the specified Attribute.Name, or null if not found.
  - 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<Object,Object>
    
    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:
    
    name - the attribute name as a string
    
    value - the attribute value
    
    Returns:
    
    the previous value of the attribute, or null if none
    
    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<Object,Object>
    
    Parameters:
    
    name - attribute name
    
    Returns:
    
    the previous value of the attribute, or null if none
  - 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<Object,Object>
    
    Parameters:
    
    value - the attribute value
    
    Returns:
    
    true if this Map maps one or more attribute names to the specified value
  - containsKey
```
public boolean containsKey(Object name)
```
    Returns true if this Map contains the specified attribute name (key).
    
    Specified by:
    
    containsKey in interface Map<Object,Object>
    
    Parameters:
    
    name - the attribute name
    
    Returns:
    
    true if this Map contains the specified 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<Object,Object>
    
    Parameters:
    
    attr - the Attributes to be stored in this map
    
    Throws:
    
    ClassCastException - if attr is not an Attributes
  - clear
```
public void clear()
```
    Removes all attributes from this Map.
    
    Specified by:
    
    clear in interface Map<Object,Object>
  - size
```
public int size()
```
    Returns the number of attributes in this Map.
    
    Specified by:
    
    size in interface Map<Object,Object>
    
    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<Object,Object>
    
    Returns:
    
    true if this map contains no key-value mappings
  - keySet
```
public Set<Object> keySet()
```
    Returns a Set view of the attribute names (keys) contained in this Map.
    
    Specified by:
    
    keySet in interface Map<Object,Object>
    
    Returns:
    
    a set view of the keys contained in this map
  - values
```
public Collection<Object> values()
```
    Returns a Collection view of the attribute values contained in this Map.
    
    Specified by:
    
    values in interface Map<Object,Object>
    
    Returns:
    
    a collection view of the values contained in this map
  - entrySet
```
public Set<Map.Entry<Object,Object>> entrySet()
```
    Returns a Collection view of the attribute name-value mappings contained in this Map.
    
    Specified by:
    
    entrySet in interface Map<Object,Object>
    
    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<Object,Object>
    
    Overrides:
    
    equals in class Object
    
    Parameters:
    
    o - the Object to be compared
    
    Returns:
    
    true if the specified Object is equal to this Map
    
    See Also:
    
    Object.hashCode(), HashMap
  - hashCode
```
public int hashCode()
```
    Returns the hash code value for this Map.
    
    Specified by:
    
    hashCode in interface Map<Object,Object>
    
    Overrides:
    
    hashCode in class Object
    
    Returns:
    
    a hash code value for this object.
    
    See Also:
    
    Object.equals(java.lang.Object), System.identityHashCode(java.lang.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
    
    Returns:
    
    a clone of this instance.
    
    See Also:
    
    Cloneable

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Class Attributes

Nested Class Summary

Nested classes/interfaces inherited from interface java.util.Map

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Methods inherited from interface java.util.Map

Field Detail

map

Constructor Detail

Attributes

Attributes

Attributes

Method Detail

get

getValue

getValue

put

putValue

remove

containsValue

containsKey

putAll

clear

size

isEmpty

keySet

values

entrySet

equals

hashCode

clone