Java example source code file (AttributesImpl.java)
The AttributesImpl.java Java example source code
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* accompanied this code).
*
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// AttributesImpl.java - default implementation of Attributes.
// http://www.saxproject.org
// Written by David Megginson
// NO WARRANTY! This class is in the public domain.
// $Id: AttributesImpl.java,v 1.2 2004/11/03 22:53:08 jsuttor Exp $
package org.xml.sax.helpers;
import org.xml.sax.Attributes;
/**
* Default implementation of the Attributes interface.
*
* <blockquote>
* <em>This module, both source code and documentation, is in the
* Public Domain, and comes with <strong>NO WARRANTY.
* See <a href='http://www.saxproject.org'>http://www.saxproject.org
* for further information.
* </blockquote>
*
* <p>This class provides a default implementation of the SAX2
* {@link org.xml.sax.Attributes Attributes} interface, with the
* addition of manipulators so that the list can be modified or
* reused.</p>
*
* <p>There are two typical uses of this class:
*
* <ol>
* <li>to take a persistent snapshot of an Attributes object
* in a {@link org.xml.sax.ContentHandler#startElement startElement} event; or</li>
* <li>to construct or modify an Attributes object in a SAX2 driver or filter.
* </ol>
*
* <p>This class replaces the now-deprecated SAX1 {@link
* org.xml.sax.helpers.AttributeListImpl AttributeListImpl}
* class; in addition to supporting the updated Attributes
* interface rather than the deprecated {@link org.xml.sax.AttributeList
* AttributeList} interface, it also includes a much more efficient
* implementation using a single array rather than a set of Vectors.</p>
*
* @since SAX 2.0
* @author David Megginson
*/
public class AttributesImpl implements Attributes
{
////////////////////////////////////////////////////////////////////
// Constructors.
////////////////////////////////////////////////////////////////////
/**
* Construct a new, empty AttributesImpl object.
*/
public AttributesImpl ()
{
length = 0;
data = null;
}
/**
* Copy an existing Attributes object.
*
* <p>This constructor is especially useful inside a
* {@link org.xml.sax.ContentHandler#startElement startElement} event.</p>
*
* @param atts The existing Attributes object.
*/
public AttributesImpl (Attributes atts)
{
setAttributes(atts);
}
////////////////////////////////////////////////////////////////////
// Implementation of org.xml.sax.Attributes.
////////////////////////////////////////////////////////////////////
/**
* Return the number of attributes in the list.
*
* @return The number of attributes in the list.
* @see org.xml.sax.Attributes#getLength
*/
public int getLength ()
{
return length;
}
/**
* Return an attribute's Namespace URI.
*
* @param index The attribute's index (zero-based).
* @return The Namespace URI, the empty string if none is
* available, or null if the index is out of range.
* @see org.xml.sax.Attributes#getURI
*/
public String getURI (int index)
{
if (index >= 0 && index < length) {
return data[index*5];
} else {
return null;
}
}
/**
* Return an attribute's local name.
*
* @param index The attribute's index (zero-based).
* @return The attribute's local name, the empty string if
* none is available, or null if the index if out of range.
* @see org.xml.sax.Attributes#getLocalName
*/
public String getLocalName (int index)
{
if (index >= 0 && index < length) {
return data[index*5+1];
} else {
return null;
}
}
/**
* Return an attribute's qualified (prefixed) name.
*
* @param index The attribute's index (zero-based).
* @return The attribute's qualified name, the empty string if
* none is available, or null if the index is out of bounds.
* @see org.xml.sax.Attributes#getQName
*/
public String getQName (int index)
{
if (index >= 0 && index < length) {
return data[index*5+2];
} else {
return null;
}
}
/**
* Return an attribute's type by index.
*
* @param index The attribute's index (zero-based).
* @return The attribute's type, "CDATA" if the type is unknown, or null
* if the index is out of bounds.
* @see org.xml.sax.Attributes#getType(int)
*/
public String getType (int index)
{
if (index >= 0 && index < length) {
return data[index*5+3];
} else {
return null;
}
}
/**
* Return an attribute's value by index.
*
* @param index The attribute's index (zero-based).
* @return The attribute's value or null if the index is out of bounds.
* @see org.xml.sax.Attributes#getValue(int)
*/
public String getValue (int index)
{
if (index >= 0 && index < length) {
return data[index*5+4];
} else {
return null;
}
}
/**
* Look up an attribute's index by Namespace name.
*
* <p>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.</p>
*
* @param uri The attribute's Namespace URI, or the empty
* string if none is available.
* @param localName The attribute's local name.
* @return The attribute's index, or -1 if none matches.
* @see org.xml.sax.Attributes#getIndex(java.lang.String,java.lang.String)
*/
public int getIndex (String uri, String localName)
{
int max = length * 5;
for (int i = 0; i < max; i += 5) {
if (data[i].equals(uri) && data[i+1].equals(localName)) {
return i / 5;
}
}
return -1;
}
/**
* Look up an attribute's index by qualified (prefixed) name.
*
* @param qName The qualified name.
* @return The attribute's index, or -1 if none matches.
* @see org.xml.sax.Attributes#getIndex(java.lang.String)
*/
public int getIndex (String qName)
{
int max = length * 5;
for (int i = 0; i < max; i += 5) {
if (data[i+2].equals(qName)) {
return i / 5;
}
}
return -1;
}
/**
* Look up an attribute's type by Namespace-qualified name.
*
* @param uri The Namespace URI, or the empty string for a name
* with no explicit Namespace URI.
* @param localName The local name.
* @return The attribute's type, or null if there is no
* matching attribute.
* @see org.xml.sax.Attributes#getType(java.lang.String,java.lang.String)
*/
public String getType (String uri, String localName)
{
int max = length * 5;
for (int i = 0; i < max; i += 5) {
if (data[i].equals(uri) && data[i+1].equals(localName)) {
return data[i+3];
}
}
return null;
}
/**
* Look up an attribute's type by qualified (prefixed) name.
*
* @param qName The qualified name.
* @return The attribute's type, or null if there is no
* matching attribute.
* @see org.xml.sax.Attributes#getType(java.lang.String)
*/
public String getType (String qName)
{
int max = length * 5;
for (int i = 0; i < max; i += 5) {
if (data[i+2].equals(qName)) {
return data[i+3];
}
}
return null;
}
/**
* Look up an attribute's value by Namespace-qualified name.
*
* @param uri The Namespace URI, or the empty string for a name
* with no explicit Namespace URI.
* @param localName The local name.
* @return The attribute's value, or null if there is no
* matching attribute.
* @see org.xml.sax.Attributes#getValue(java.lang.String,java.lang.String)
*/
public String getValue (String uri, String localName)
{
int max = length * 5;
for (int i = 0; i < max; i += 5) {
if (data[i].equals(uri) && data[i+1].equals(localName)) {
return data[i+4];
}
}
return null;
}
/**
* Look up an attribute's value by qualified (prefixed) name.
*
* @param qName The qualified name.
* @return The attribute's value, or null if there is no
* matching attribute.
* @see org.xml.sax.Attributes#getValue(java.lang.String)
*/
public String getValue (String qName)
{
int max = length * 5;
for (int i = 0; i < max; i += 5) {
if (data[i+2].equals(qName)) {
return data[i+4];
}
}
return null;
}
////////////////////////////////////////////////////////////////////
// Manipulators.
////////////////////////////////////////////////////////////////////
/**
* Clear the attribute list for reuse.
*
* <p>Note that little memory is freed by this call:
* the current array is kept so it can be
* reused.</p>
*/
public void clear ()
{
if (data != null) {
for (int i = 0; i < (length * 5); i++)
data [i] = null;
}
length = 0;
}
/**
* Copy an entire Attributes object.
*
* <p>It may be more efficient to reuse an existing object
* rather than constantly allocating new ones.</p>
*
* @param atts The attributes to copy.
*/
public void setAttributes (Attributes atts)
{
clear();
length = atts.getLength();
if (length > 0) {
data = new String[length*5];
for (int i = 0; i < length; i++) {
data[i*5] = atts.getURI(i);
data[i*5+1] = atts.getLocalName(i);
data[i*5+2] = atts.getQName(i);
data[i*5+3] = atts.getType(i);
data[i*5+4] = atts.getValue(i);
}
}
}
/**
* Add an attribute to the end of the list.
*
* <p>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.</p>
*
* @param uri The Namespace URI, or the empty string if
* none is available or Namespace processing is not
* being performed.
* @param localName The local name, or the empty string if
* Namespace processing is not being performed.
* @param qName The qualified (prefixed) name, or the empty string
* if qualified names are not available.
* @param type The attribute type as a string.
* @param value The attribute value.
*/
public void addAttribute (String uri, String localName, String qName,
String type, String value)
{
ensureCapacity(length+1);
data[length*5] = uri;
data[length*5+1] = localName;
data[length*5+2] = qName;
data[length*5+3] = type;
data[length*5+4] = value;
length++;
}
/**
* Set an attribute in the list.
*
* <p>For the sake of speed, this method does no checking
* for name conflicts or well-formedness: such checks are the
* responsibility of the application.</p>
*
* @param index The index of the attribute (zero-based).
* @param uri The Namespace URI, or the empty string if
* none is available or Namespace processing is not
* being performed.
* @param localName The local name, or the empty string if
* Namespace processing is not being performed.
* @param qName The qualified name, or the empty string
* if qualified names are not available.
* @param type The attribute type as a string.
* @param value The attribute value.
* @exception java.lang.ArrayIndexOutOfBoundsException When the
* supplied index does not point to an attribute
* in the list.
*/
public void setAttribute (int index, String uri, String localName,
String qName, String type, String value)
{
if (index >= 0 && index < length) {
data[index*5] = uri;
data[index*5+1] = localName;
data[index*5+2] = qName;
data[index*5+3] = type;
data[index*5+4] = value;
} else {
badIndex(index);
}
}
/**
* Remove an attribute from the list.
*
* @param index The index of the attribute (zero-based).
* @exception java.lang.ArrayIndexOutOfBoundsException When the
* supplied index does not point to an attribute
* in the list.
*/
public void removeAttribute (int index)
{
if (index >= 0 && index < length) {
if (index < length - 1) {
System.arraycopy(data, (index+1)*5, data, index*5,
(length-index-1)*5);
}
index = (length - 1) * 5;
data [index++] = null;
data [index++] = null;
data [index++] = null;
data [index++] = null;
data [index] = null;
length--;
} else {
badIndex(index);
}
}
/**
* Set the Namespace URI of a specific attribute.
*
* @param index The index of the attribute (zero-based).
* @param uri The attribute's Namespace URI, or the empty
* string for none.
* @exception java.lang.ArrayIndexOutOfBoundsException When the
* supplied index does not point to an attribute
* in the list.
*/
public void setURI (int index, String uri)
{
if (index >= 0 && index < length) {
data[index*5] = uri;
} else {
badIndex(index);
}
}
/**
* Set the local name of a specific attribute.
*
* @param index The index of the attribute (zero-based).
* @param localName The attribute's local name, or the empty
* string for none.
* @exception java.lang.ArrayIndexOutOfBoundsException When the
* supplied index does not point to an attribute
* in the list.
*/
public void setLocalName (int index, String localName)
{
if (index >= 0 && index < length) {
data[index*5+1] = localName;
} else {
badIndex(index);
}
}
/**
* Set the qualified name of a specific attribute.
*
* @param index The index of the attribute (zero-based).
* @param qName The attribute's qualified name, or the empty
* string for none.
* @exception java.lang.ArrayIndexOutOfBoundsException When the
* supplied index does not point to an attribute
* in the list.
*/
public void setQName (int index, String qName)
{
if (index >= 0 && index < length) {
data[index*5+2] = qName;
} else {
badIndex(index);
}
}
/**
* Set the type of a specific attribute.
*
* @param index The index of the attribute (zero-based).
* @param type The attribute's type.
* @exception java.lang.ArrayIndexOutOfBoundsException When the
* supplied index does not point to an attribute
* in the list.
*/
public void setType (int index, String type)
{
if (index >= 0 && index < length) {
data[index*5+3] = type;
} else {
badIndex(index);
}
}
/**
* Set the value of a specific attribute.
*
* @param index The index of the attribute (zero-based).
* @param value The attribute's value.
* @exception java.lang.ArrayIndexOutOfBoundsException When the
* supplied index does not point to an attribute
* in the list.
*/
public void setValue (int index, String value)
{
if (index >= 0 && index < length) {
data[index*5+4] = value;
} else {
badIndex(index);
}
}
////////////////////////////////////////////////////////////////////
// Internal methods.
////////////////////////////////////////////////////////////////////
/**
* Ensure the internal array's capacity.
*
* @param n The minimum number of attributes that the array must
* be able to hold.
*/
private void ensureCapacity (int n) {
if (n <= 0) {
return;
}
int max;
if (data == null || data.length == 0) {
max = 25;
}
else if (data.length >= n * 5) {
return;
}
else {
max = data.length;
}
while (max < n * 5) {
max *= 2;
}
String newData[] = new String[max];
if (length > 0) {
System.arraycopy(data, 0, newData, 0, length*5);
}
data = newData;
}
/**
* Report a bad array index in a manipulator.
*
* @param index The index to report.
* @exception java.lang.ArrayIndexOutOfBoundsException Always.
*/
private void badIndex (int index)
throws ArrayIndexOutOfBoundsException
{
String msg =
"Attempt to modify attribute at illegal index: " + index;
throw new ArrayIndexOutOfBoundsException(msg);
}
////////////////////////////////////////////////////////////////////
// Internal state.
////////////////////////////////////////////////////////////////////
int length;
String data [];
}
// end of AttributesImpl.java
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