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org.xml.sax.helpers

Class AttributesImpl

Implemented Interfaces:
Attributes
Known Direct Subclasses:
Attributes2Impl
public class AttributesImpl
extends Object
implements Attributes
Default implementation of the Attributes interface.
This module, both source code and documentation, is in the Public Domain, and comes with NO WARRANTY. See http://www.saxproject.org for further information.

This class provides a default implementation of the SAX2 Attributes interface, with the addition of manipulators so that the list can be modified or reused.

There are two typical uses of this class:

  1. to take a persistent snapshot of an Attributes object in a startElement event; or
  2. to construct or modify an Attributes object in a SAX2 driver or filter.

This class replaces the now-deprecated SAX1 AttributeListImpl class; in addition to supporting the updated Attributes interface rather than the deprecated AttributeList interface, it also includes a much more efficient implementation using a single array rather than a set of Vectors.

Since:
SAX 2.0

Constructor Summary

AttributesImpl()
Construct a new, empty AttributesImpl object.
AttributesImpl(Attributes atts)
Copy an existing Attributes object.

Method Summary

void
addAttribute(String uri, String localName, String qName, String type, String value)
Add an attribute to the end of the list.
void
clear()
Clear the attribute list for reuse.
int
getIndex(String qName)
Look up an attribute's index by qualified (prefixed) name.
int
getIndex(String uri, String localName)
Look up an attribute's index by Namespace name.
int
getLength()
Return the number of attributes in the list.
String
getLocalName(int index)
Return an attribute's local name.
String
getQName(int index)
Return an attribute's qualified (prefixed) name.
String
getType(int index)
Return an attribute's type by index.
String
getType(String qName)
Look up an attribute's type by qualified (prefixed) name.
String
getType(String uri, String localName)
Look up an attribute's type by Namespace-qualified name.
String
getURI(int index)
Return an attribute's Namespace URI.
String
getValue(int index)
Return an attribute's value by index.
String
getValue(String qName)
Look up an attribute's value by qualified (prefixed) name.
String
getValue(String uri, String localName)
Look up an attribute's value by Namespace-qualified name.
void
removeAttribute(int index)
Remove an attribute from the list.
void
setAttribute(int index, String uri, String localName, String qName, String type, String value)
Set an attribute in the list.
void
setAttributes(Attributes atts)
Copy an entire Attributes object.
void
setLocalName(int index, String localName)
Set the local name of a specific attribute.
void
setQName(int index, String qName)
Set the qualified name of a specific attribute.
void
setType(int index, String type)
Set the type of a specific attribute.
void
setURI(int index, String uri)
Set the Namespace URI of a specific attribute.
void
setValue(int index, String value)
Set the value of a specific attribute.

Methods inherited from class java.lang.Object

clone, equals, extends Object> getClass, finalize, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

AttributesImpl

public AttributesImpl()
Construct a new, empty AttributesImpl object.

AttributesImpl

public AttributesImpl(Attributes atts)
Copy an existing Attributes object.

This constructor is especially useful inside a startElement event.

Parameters:
atts - The existing Attributes object.

Method Details

addAttribute

public void addAttribute(String uri,
                         String localName,
                         String qName,
                         String type,
                         String value)
Add an attribute to the end of the list.

For the sake of speed, this method does no checking to see if the attribute is already in the list: that is the responsibility of the application.

Parameters:
uri - The Namespace URI, or the empty string if none is available or Namespace processing is not being performed.
localName - The local name, or the empty string if Namespace processing is not being performed.
qName - The qualified (prefixed) name, or the empty string if qualified names are not available.
type - The attribute type as a string.
value - The attribute value.

clear

public void clear()
Clear the attribute list for reuse.

Note that little memory is freed by this call: the current array is kept so it can be reused.

getIndex

public int getIndex(String qName)
Look up an attribute's index by qualified (prefixed) name.
Specified by:
getIndex in interface Attributes
Parameters:
qName - The qualified name.
Returns:
The attribute's index, or -1 if none matches.
See Also:
Attributes.getIndex(String)

getIndex

public int getIndex(String uri,
                    String localName)
Look up an attribute's index by Namespace name.

In many cases, it will be more efficient to look up the name once and use the index query methods rather than using the name query methods repeatedly.

Specified by:
getIndex in interface Attributes
Parameters:
uri - The attribute's Namespace URI, or the empty string if none is available.
localName - The attribute's local name.
Returns:
The attribute's index, or -1 if none matches.
See Also:
Attributes.getIndex(String,String)

getLength

public int getLength()
Return the number of attributes in the list.
Specified by:
getLength in interface Attributes
Returns:
The number of attributes in the list.
See Also:
Attributes.getLength()

getLocalName

public String getLocalName(int index)
Return an attribute's local name.
Specified by:
getLocalName in interface Attributes
Parameters:
index - The attribute's index (zero-based).
Returns:
The attribute's local name, the empty string if none is available, or null if the index if out of range.
See Also:
Attributes.getLocalName(int)

getQName

public String getQName(int index)
Return an attribute's qualified (prefixed) name.
Specified by:
getQName in interface Attributes
Parameters:
index - The attribute's index (zero-based).
Returns:
The attribute's qualified name, the empty string if none is available, or null if the index is out of bounds.
See Also:
Attributes.getQName(int)

getType

public String getType(int index)
Return an attribute's type by index.
Specified by:
getType in interface Attributes
Parameters:
index - The attribute's index (zero-based).
Returns:
The attribute's type, "CDATA" if the type is unknown, or null if the index is out of bounds.
See Also:
Attributes.getType(int)

getType

public String getType(String qName)
Look up an attribute's type by qualified (prefixed) name.
Specified by:
getType in interface Attributes
Parameters:
qName - The qualified name.
Returns:
The attribute's type, or null if there is no matching attribute.
See Also:
Attributes.getType(String)

getType

public String getType(String uri,
                      String localName)
Look up an attribute's type by Namespace-qualified name.
Specified by:
getType in interface Attributes
Parameters:
uri - The Namespace URI, or the empty string for a name with no explicit Namespace URI.
localName - The local name.
Returns:
The attribute's type, or null if there is no matching attribute.
See Also:
Attributes.getType(String,String)

getURI

public String getURI(int index)
Return an attribute's Namespace URI.
Specified by:
getURI in interface Attributes
Parameters:
index - The attribute's index (zero-based).
Returns:
The Namespace URI, the empty string if none is available, or null if the index is out of range.
See Also:
Attributes.getURI(int)

getValue

public String getValue(int index)
Return an attribute's value by index.
Specified by:
getValue in interface Attributes
Parameters:
index - The attribute's index (zero-based).
Returns:
The attribute's value or null if the index is out of bounds.
See Also:
Attributes.getValue(int)

getValue

public String getValue(String qName)
Look up an attribute's value by qualified (prefixed) name.
Specified by:
getValue in interface Attributes
Parameters:
qName - The qualified name.
Returns:
The attribute's value, or null if there is no matching attribute.
See Also:
Attributes.getValue(String)

getValue

public String getValue(String uri,
                       String localName)
Look up an attribute's value by Namespace-qualified name.
Specified by:
getValue in interface Attributes
Parameters:
uri - The Namespace URI, or the empty string for a name with no explicit Namespace URI.
localName - The local name.
Returns:
The attribute's value, or null if there is no matching attribute.
See Also:
Attributes.getValue(String,String)

removeAttribute

public void removeAttribute(int index)
Remove an attribute from the list.
Parameters:
index - The index of the attribute (zero-based).
Throws:
ArrayIndexOutOfBoundsException - When the supplied index does not point to an attribute in the list.

setAttribute

public void setAttribute(int index,
                         String uri,
                         String localName,
                         String qName,
                         String type,
                         String value)
Set an attribute in the list.

For the sake of speed, this method does no checking for name conflicts or well-formedness: such checks are the responsibility of the application.

Parameters:
index - The index of the attribute (zero-based).
uri - The Namespace URI, or the empty string if none is available or Namespace processing is not being performed.
localName - The local name, or the empty string if Namespace processing is not being performed.
qName - The qualified name, or the empty string if qualified names are not available.
type - The attribute type as a string.
value - The attribute value.
Throws:
ArrayIndexOutOfBoundsException - When the supplied index does not point to an attribute in the list.

setAttributes

public void setAttributes(Attributes atts)
Copy an entire Attributes object.

It may be more efficient to reuse an existing object rather than constantly allocating new ones.

Parameters:
atts - The attributes to copy.

setLocalName

public void setLocalName(int index,
                         String localName)
Set the local name of a specific attribute.
Parameters:
index - The index of the attribute (zero-based).
localName - The attribute's local name, or the empty string for none.
Throws:
ArrayIndexOutOfBoundsException - When the supplied index does not point to an attribute in the list.

setQName

public void setQName(int index,
                     String qName)
Set the qualified name of a specific attribute.
Parameters:
index - The index of the attribute (zero-based).
qName - The attribute's qualified name, or the empty string for none.
Throws:
ArrayIndexOutOfBoundsException - When the supplied index does not point to an attribute in the list.

setType

public void setType(int index,
                    String type)
Set the type of a specific attribute.
Parameters:
index - The index of the attribute (zero-based).
type - The attribute's type.
Throws:
ArrayIndexOutOfBoundsException - When the supplied index does not point to an attribute in the list.

setURI

public void setURI(int index,
                   String uri)
Set the Namespace URI of a specific attribute.
Parameters:
index - The index of the attribute (zero-based).
uri - The attribute's Namespace URI, or the empty string for none.
Throws:
ArrayIndexOutOfBoundsException - When the supplied index does not point to an attribute in the list.

setValue

public void setValue(int index,
                     String value)
Set the value of a specific attribute.
Parameters:
index - The index of the attribute (zero-based).
value - The attribute's value.
Throws:
ArrayIndexOutOfBoundsException - When the supplied index does not point to an attribute in the list.

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