org.restlet.data
Class Tag

java.lang.Object
  extended by org.restlet.data.Tag

public final class Tag
extends Object

Validation tag equivalent to an HTTP entity tag (E-Tag). "A strong entity tag may be shared by two entities of a resource only if they are equivalent by octet equality.

A weak entity tag may be shared by two entities of a resource only if the entities are equivalent and could be substituted for each other with no significant change in semantics."

Author:
Jerome Louvel
See Also:
RepresentationInfo.getTag(), HTTP Entity Tags, HTTP Entity Tag Cache Validators

Field Summary
static Tag ALL
          Tag matching any other tag, used in call's condition data.
 
Constructor Summary
Tag()
          Default constructor.
Tag(String opaqueTag)
          Constructor of weak tags.
Tag(String opaqueTag, boolean weak)
          Constructor.
 
Method Summary
 boolean equals(Object object)
          Indicates if both tags are equal.
 boolean equals(Object object, boolean checkWeakness)
          Indicates if both tags are equal.
 String format()
          Returns tag formatted as an HTTP tag string.
 String getName()
          Returns the name, corresponding to an HTTP opaque tag value.
 int hashCode()
          
 boolean isWeak()
          Indicates if the tag is weak.
static Tag parse(String httpTag)
          Parses a tag formatted as defined by the HTTP standard.
 String toString()
          Returns the name.
 
Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
 

Field Detail

ALL

public static final Tag ALL
Tag matching any other tag, used in call's condition data.

Constructor Detail

Tag

public Tag()
Default constructor. The opaque tag is set to null and the weakness indicator is set to true.


Tag

public Tag(String opaqueTag)
Constructor of weak tags.

Parameters:
opaqueTag - The tag value.

Tag

public Tag(String opaqueTag,
           boolean weak)
Constructor.

Parameters:
opaqueTag - The tag value.
weak - The weakness indicator.
Method Detail

parse

public static Tag parse(String httpTag)
Parses a tag formatted as defined by the HTTP standard.

Parameters:
httpTag - The HTTP tag string; if it starts with 'W/' the tag will be marked as weak and the data following the 'W/' used as the tag; otherwise it should be surrounded with quotes (e.g., "sometag").
Returns:
A new tag instance.
See Also:
HTTP Entity Tags

equals

public boolean equals(Object object)
Indicates if both tags are equal.

Overrides:
equals in class Object
Parameters:
object - The object to compare to.
Returns:
True if both tags are equal.

equals

public boolean equals(Object object,
                      boolean checkWeakness)
Indicates if both tags are equal.

Parameters:
object - The object to compare to.
checkWeakness - The equality test takes care or not of the weakness.
Returns:
True if both tags are equal.

format

public String format()
Returns tag formatted as an HTTP tag string.

Returns:
The formatted HTTP tag string.
See Also:
HTTP Entity Tags

getName

public String getName()
Returns the name, corresponding to an HTTP opaque tag value.

Returns:
The name, corresponding to an HTTP opaque tag value.

hashCode

public int hashCode()

Overrides:
hashCode in class Object

isWeak

public boolean isWeak()
Indicates if the tag is weak.

Returns:
True if the tag is weak, false if the tag is strong.

toString

public String toString()
Returns the name.

Overrides:
toString in class Object
Returns:
The name.


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