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jeremybenn |
// AttributesImpl.java - default implementation of Attributes.
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// http://www.saxproject.org
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// Written by David Megginson
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// NO WARRANTY! This class is in the public domain.
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// $Id: AttributesImpl.java,v 1.1 2004/12/23 22:38:42 mark Exp $
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package org.xml.sax.helpers;
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import org.xml.sax.Attributes;
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/**
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* Default implementation of the Attributes interface.
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*
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* <blockquote>
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* <em>This module, both source code and documentation, is in the
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* Public Domain, and comes with <strong>NO WARRANTY</strong>.</em>
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* See <a href='http://www.saxproject.org'>http://www.saxproject.org</a>
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* for further information.
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* </blockquote>
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*
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* <p>This class provides a default implementation of the SAX2
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* {@link org.xml.sax.Attributes Attributes} interface, with the
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* addition of manipulators so that the list can be modified or
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* reused.</p>
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*
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* <p>There are two typical uses of this class:</p>
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*
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* <ol>
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* <li>to take a persistent snapshot of an Attributes object
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* in a {@link org.xml.sax.ContentHandler#startElement startElement} event; or</li>
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* <li>to construct or modify an Attributes object in a SAX2 driver or filter.</li>
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* </ol>
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*
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* <p>This class replaces the now-deprecated SAX1 {@link
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* org.xml.sax.helpers.AttributeListImpl AttributeListImpl}
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* class; in addition to supporting the updated Attributes
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* interface rather than the deprecated {@link org.xml.sax.AttributeList
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* AttributeList} interface, it also includes a much more efficient
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* implementation using a single array rather than a set of Vectors.</p>
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*
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* @since SAX 2.0
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* @author David Megginson
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* @version 2.0.1 (sax2r2)
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*/
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public class AttributesImpl implements Attributes
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{
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////////////////////////////////////////////////////////////////////
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// Constructors.
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////////////////////////////////////////////////////////////////////
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/**
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* Construct a new, empty AttributesImpl object.
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*/
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public AttributesImpl ()
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{
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length = 0;
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data = null;
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}
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/**
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* Copy an existing Attributes object.
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*
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* <p>This constructor is especially useful inside a
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* {@link org.xml.sax.ContentHandler#startElement startElement} event.</p>
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*
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* @param atts The existing Attributes object.
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*/
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public AttributesImpl (Attributes atts)
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{
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setAttributes(atts);
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}
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////////////////////////////////////////////////////////////////////
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// Implementation of org.xml.sax.Attributes.
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////////////////////////////////////////////////////////////////////
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/**
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* Return the number of attributes in the list.
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*
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* @return The number of attributes in the list.
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* @see org.xml.sax.Attributes#getLength
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*/
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public int getLength ()
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{
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return length;
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}
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/**
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* Return an attribute's Namespace URI.
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*
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* @param index The attribute's index (zero-based).
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* @return The Namespace URI, the empty string if none is
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* available, or null if the index is out of range.
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* @see org.xml.sax.Attributes#getURI
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*/
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public String getURI (int index)
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{
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if (index >= 0 && index < length) {
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return data[index*5];
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} else {
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return null;
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}
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}
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/**
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* Return an attribute's local name.
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*
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* @param index The attribute's index (zero-based).
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* @return The attribute's local name, the empty string if
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* none is available, or null if the index if out of range.
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* @see org.xml.sax.Attributes#getLocalName
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*/
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public String getLocalName (int index)
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{
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if (index >= 0 && index < length) {
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return data[index*5+1];
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} else {
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return null;
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}
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}
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/**
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* Return an attribute's qualified (prefixed) name.
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*
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* @param index The attribute's index (zero-based).
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* @return The attribute's qualified name, the empty string if
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* none is available, or null if the index is out of bounds.
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* @see org.xml.sax.Attributes#getQName
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*/
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public String getQName (int index)
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{
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if (index >= 0 && index < length) {
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return data[index*5+2];
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} else {
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return null;
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}
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}
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/**
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* Return an attribute's type by index.
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*
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* @param index The attribute's index (zero-based).
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* @return The attribute's type, "CDATA" if the type is unknown, or null
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* if the index is out of bounds.
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* @see org.xml.sax.Attributes#getType(int)
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*/
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public String getType (int index)
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{
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if (index >= 0 && index < length) {
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return data[index*5+3];
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} else {
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return null;
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}
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}
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/**
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* Return an attribute's value by index.
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*
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* @param index The attribute's index (zero-based).
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* @return The attribute's value or null if the index is out of bounds.
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* @see org.xml.sax.Attributes#getValue(int)
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*/
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public String getValue (int index)
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{
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if (index >= 0 && index < length) {
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return data[index*5+4];
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} else {
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return null;
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}
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}
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/**
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* Look up an attribute's index by Namespace name.
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*
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* <p>In many cases, it will be more efficient to look up the name once and
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* use the index query methods rather than using the name query methods
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* repeatedly.</p>
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*
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* @param uri The attribute's Namespace URI, or the empty
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* string if none is available.
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* @param localName The attribute's local name.
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* @return The attribute's index, or -1 if none matches.
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* @see org.xml.sax.Attributes#getIndex(java.lang.String,java.lang.String)
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*/
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public int getIndex (String uri, String localName)
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{
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int max = length * 5;
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for (int i = 0; i < max; i += 5) {
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if (data[i].equals(uri) && data[i+1].equals(localName)) {
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return i / 5;
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}
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}
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return -1;
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}
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/**
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* Look up an attribute's index by qualified (prefixed) name.
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*
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* @param qName The qualified name.
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* @return The attribute's index, or -1 if none matches.
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* @see org.xml.sax.Attributes#getIndex(java.lang.String)
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*/
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public int getIndex (String qName)
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{
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int max = length * 5;
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for (int i = 0; i < max; i += 5) {
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if (data[i+2].equals(qName)) {
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return i / 5;
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}
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}
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return -1;
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}
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/**
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* Look up an attribute's type by Namespace-qualified name.
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*
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* @param uri The Namespace URI, or the empty string for a name
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* with no explicit Namespace URI.
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* @param localName The local name.
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* @return The attribute's type, or null if there is no
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* matching attribute.
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* @see org.xml.sax.Attributes#getType(java.lang.String,java.lang.String)
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*/
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public String getType (String uri, String localName)
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{
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int max = length * 5;
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for (int i = 0; i < max; i += 5) {
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if (data[i].equals(uri) && data[i+1].equals(localName)) {
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return data[i+3];
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}
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}
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return null;
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}
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/**
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* Look up an attribute's type by qualified (prefixed) name.
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*
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* @param qName The qualified name.
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* @return The attribute's type, or null if there is no
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* matching attribute.
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* @see org.xml.sax.Attributes#getType(java.lang.String)
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*/
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public String getType (String qName)
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{
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int max = length * 5;
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for (int i = 0; i < max; i += 5) {
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if (data[i+2].equals(qName)) {
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return data[i+3];
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}
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}
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return null;
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}
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/**
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* Look up an attribute's value by Namespace-qualified name.
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*
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* @param uri The Namespace URI, or the empty string for a name
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* with no explicit Namespace URI.
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* @param localName The local name.
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* @return The attribute's value, or null if there is no
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* matching attribute.
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* @see org.xml.sax.Attributes#getValue(java.lang.String,java.lang.String)
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*/
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public String getValue (String uri, String localName)
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{
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int max = length * 5;
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for (int i = 0; i < max; i += 5) {
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if (data[i].equals(uri) && data[i+1].equals(localName)) {
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return data[i+4];
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}
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}
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return null;
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}
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/**
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* Look up an attribute's value by qualified (prefixed) name.
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*
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* @param qName The qualified name.
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* @return The attribute's value, or null if there is no
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* matching attribute.
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* @see org.xml.sax.Attributes#getValue(java.lang.String)
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*/
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public String getValue (String qName)
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{
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int max = length * 5;
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for (int i = 0; i < max; i += 5) {
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if (data[i+2].equals(qName)) {
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return data[i+4];
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}
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}
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return null;
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}
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| 313 |
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| 314 |
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| 315 |
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////////////////////////////////////////////////////////////////////
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| 316 |
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// Manipulators.
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////////////////////////////////////////////////////////////////////
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| 319 |
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| 320 |
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/**
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* Clear the attribute list for reuse.
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*
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* <p>Note that little memory is freed by this call:
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* the current array is kept so it can be
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* reused.</p>
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*/
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public void clear ()
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{
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if (data != null) {
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for (int i = 0; i < (length * 5); i++)
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data [i] = null;
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}
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length = 0;
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}
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| 336 |
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| 337 |
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/**
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| 338 |
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* Copy an entire Attributes object.
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*
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| 340 |
|
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* <p>It may be more efficient to reuse an existing object
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| 341 |
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* rather than constantly allocating new ones.</p>
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*
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* @param atts The attributes to copy.
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*/
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public void setAttributes (Attributes atts)
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{
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clear();
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length = atts.getLength();
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| 349 |
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if (length > 0) {
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data = new String[length*5];
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| 351 |
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for (int i = 0; i < length; i++) {
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data[i*5] = atts.getURI(i);
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data[i*5+1] = atts.getLocalName(i);
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data[i*5+2] = atts.getQName(i);
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data[i*5+3] = atts.getType(i);
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data[i*5+4] = atts.getValue(i);
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}
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}
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| 359 |
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}
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| 360 |
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| 361 |
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| 362 |
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/**
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| 363 |
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* Add an attribute to the end of the list.
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| 364 |
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*
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| 365 |
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|
* <p>For the sake of speed, this method does no checking
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| 366 |
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* to see if the attribute is already in the list: that is
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| 367 |
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* the responsibility of the application.</p>
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| 368 |
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*
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|
|
* @param uri The Namespace URI, or the empty string if
|
| 370 |
|
|
* none is available or Namespace processing is not
|
| 371 |
|
|
* being performed.
|
| 372 |
|
|
* @param localName The local name, or the empty string if
|
| 373 |
|
|
* Namespace processing is not being performed.
|
| 374 |
|
|
* @param qName The qualified (prefixed) name, or the empty string
|
| 375 |
|
|
* if qualified names are not available.
|
| 376 |
|
|
* @param type The attribute type as a string.
|
| 377 |
|
|
* @param value The attribute value.
|
| 378 |
|
|
*/
|
| 379 |
|
|
public void addAttribute (String uri, String localName, String qName,
|
| 380 |
|
|
String type, String value)
|
| 381 |
|
|
{
|
| 382 |
|
|
ensureCapacity(length+1);
|
| 383 |
|
|
data[length*5] = uri;
|
| 384 |
|
|
data[length*5+1] = localName;
|
| 385 |
|
|
data[length*5+2] = qName;
|
| 386 |
|
|
data[length*5+3] = type;
|
| 387 |
|
|
data[length*5+4] = value;
|
| 388 |
|
|
length++;
|
| 389 |
|
|
}
|
| 390 |
|
|
|
| 391 |
|
|
|
| 392 |
|
|
/**
|
| 393 |
|
|
* Set an attribute in the list.
|
| 394 |
|
|
*
|
| 395 |
|
|
* <p>For the sake of speed, this method does no checking
|
| 396 |
|
|
* for name conflicts or well-formedness: such checks are the
|
| 397 |
|
|
* responsibility of the application.</p>
|
| 398 |
|
|
*
|
| 399 |
|
|
* @param index The index of the attribute (zero-based).
|
| 400 |
|
|
* @param uri The Namespace URI, or the empty string if
|
| 401 |
|
|
* none is available or Namespace processing is not
|
| 402 |
|
|
* being performed.
|
| 403 |
|
|
* @param localName The local name, or the empty string if
|
| 404 |
|
|
* Namespace processing is not being performed.
|
| 405 |
|
|
* @param qName The qualified name, or the empty string
|
| 406 |
|
|
* if qualified names are not available.
|
| 407 |
|
|
* @param type The attribute type as a string.
|
| 408 |
|
|
* @param value The attribute value.
|
| 409 |
|
|
* @exception java.lang.ArrayIndexOutOfBoundsException When the
|
| 410 |
|
|
* supplied index does not point to an attribute
|
| 411 |
|
|
* in the list.
|
| 412 |
|
|
*/
|
| 413 |
|
|
public void setAttribute (int index, String uri, String localName,
|
| 414 |
|
|
String qName, String type, String value)
|
| 415 |
|
|
{
|
| 416 |
|
|
if (index >= 0 && index < length) {
|
| 417 |
|
|
data[index*5] = uri;
|
| 418 |
|
|
data[index*5+1] = localName;
|
| 419 |
|
|
data[index*5+2] = qName;
|
| 420 |
|
|
data[index*5+3] = type;
|
| 421 |
|
|
data[index*5+4] = value;
|
| 422 |
|
|
} else {
|
| 423 |
|
|
badIndex(index);
|
| 424 |
|
|
}
|
| 425 |
|
|
}
|
| 426 |
|
|
|
| 427 |
|
|
|
| 428 |
|
|
/**
|
| 429 |
|
|
* Remove an attribute from the list.
|
| 430 |
|
|
*
|
| 431 |
|
|
* @param index The index of the attribute (zero-based).
|
| 432 |
|
|
* @exception java.lang.ArrayIndexOutOfBoundsException When the
|
| 433 |
|
|
* supplied index does not point to an attribute
|
| 434 |
|
|
* in the list.
|
| 435 |
|
|
*/
|
| 436 |
|
|
public void removeAttribute (int index)
|
| 437 |
|
|
{
|
| 438 |
|
|
if (index >= 0 && index < length) {
|
| 439 |
|
|
if (index < length - 1) {
|
| 440 |
|
|
System.arraycopy(data, (index+1)*5, data, index*5,
|
| 441 |
|
|
(length-index-1)*5);
|
| 442 |
|
|
}
|
| 443 |
|
|
index = (length - 1) * 5;
|
| 444 |
|
|
data [index++] = null;
|
| 445 |
|
|
data [index++] = null;
|
| 446 |
|
|
data [index++] = null;
|
| 447 |
|
|
data [index++] = null;
|
| 448 |
|
|
data [index] = null;
|
| 449 |
|
|
length--;
|
| 450 |
|
|
} else {
|
| 451 |
|
|
badIndex(index);
|
| 452 |
|
|
}
|
| 453 |
|
|
}
|
| 454 |
|
|
|
| 455 |
|
|
|
| 456 |
|
|
/**
|
| 457 |
|
|
* Set the Namespace URI of a specific attribute.
|
| 458 |
|
|
*
|
| 459 |
|
|
* @param index The index of the attribute (zero-based).
|
| 460 |
|
|
* @param uri The attribute's Namespace URI, or the empty
|
| 461 |
|
|
* string for none.
|
| 462 |
|
|
* @exception java.lang.ArrayIndexOutOfBoundsException When the
|
| 463 |
|
|
* supplied index does not point to an attribute
|
| 464 |
|
|
* in the list.
|
| 465 |
|
|
*/
|
| 466 |
|
|
public void setURI (int index, String uri)
|
| 467 |
|
|
{
|
| 468 |
|
|
if (index >= 0 && index < length) {
|
| 469 |
|
|
data[index*5] = uri;
|
| 470 |
|
|
} else {
|
| 471 |
|
|
badIndex(index);
|
| 472 |
|
|
}
|
| 473 |
|
|
}
|
| 474 |
|
|
|
| 475 |
|
|
|
| 476 |
|
|
/**
|
| 477 |
|
|
* Set the local name of a specific attribute.
|
| 478 |
|
|
*
|
| 479 |
|
|
* @param index The index of the attribute (zero-based).
|
| 480 |
|
|
* @param localName The attribute's local name, or the empty
|
| 481 |
|
|
* string for none.
|
| 482 |
|
|
* @exception java.lang.ArrayIndexOutOfBoundsException When the
|
| 483 |
|
|
* supplied index does not point to an attribute
|
| 484 |
|
|
* in the list.
|
| 485 |
|
|
*/
|
| 486 |
|
|
public void setLocalName (int index, String localName)
|
| 487 |
|
|
{
|
| 488 |
|
|
if (index >= 0 && index < length) {
|
| 489 |
|
|
data[index*5+1] = localName;
|
| 490 |
|
|
} else {
|
| 491 |
|
|
badIndex(index);
|
| 492 |
|
|
}
|
| 493 |
|
|
}
|
| 494 |
|
|
|
| 495 |
|
|
|
| 496 |
|
|
/**
|
| 497 |
|
|
* Set the qualified name of a specific attribute.
|
| 498 |
|
|
*
|
| 499 |
|
|
* @param index The index of the attribute (zero-based).
|
| 500 |
|
|
* @param qName The attribute's qualified name, or the empty
|
| 501 |
|
|
* string for none.
|
| 502 |
|
|
* @exception java.lang.ArrayIndexOutOfBoundsException When the
|
| 503 |
|
|
* supplied index does not point to an attribute
|
| 504 |
|
|
* in the list.
|
| 505 |
|
|
*/
|
| 506 |
|
|
public void setQName (int index, String qName)
|
| 507 |
|
|
{
|
| 508 |
|
|
if (index >= 0 && index < length) {
|
| 509 |
|
|
data[index*5+2] = qName;
|
| 510 |
|
|
} else {
|
| 511 |
|
|
badIndex(index);
|
| 512 |
|
|
}
|
| 513 |
|
|
}
|
| 514 |
|
|
|
| 515 |
|
|
|
| 516 |
|
|
/**
|
| 517 |
|
|
* Set the type of a specific attribute.
|
| 518 |
|
|
*
|
| 519 |
|
|
* @param index The index of the attribute (zero-based).
|
| 520 |
|
|
* @param type The attribute's type.
|
| 521 |
|
|
* @exception java.lang.ArrayIndexOutOfBoundsException When the
|
| 522 |
|
|
* supplied index does not point to an attribute
|
| 523 |
|
|
* in the list.
|
| 524 |
|
|
*/
|
| 525 |
|
|
public void setType (int index, String type)
|
| 526 |
|
|
{
|
| 527 |
|
|
if (index >= 0 && index < length) {
|
| 528 |
|
|
data[index*5+3] = type;
|
| 529 |
|
|
} else {
|
| 530 |
|
|
badIndex(index);
|
| 531 |
|
|
}
|
| 532 |
|
|
}
|
| 533 |
|
|
|
| 534 |
|
|
|
| 535 |
|
|
/**
|
| 536 |
|
|
* Set the value of a specific attribute.
|
| 537 |
|
|
*
|
| 538 |
|
|
* @param index The index of the attribute (zero-based).
|
| 539 |
|
|
* @param value The attribute's value.
|
| 540 |
|
|
* @exception java.lang.ArrayIndexOutOfBoundsException When the
|
| 541 |
|
|
* supplied index does not point to an attribute
|
| 542 |
|
|
* in the list.
|
| 543 |
|
|
*/
|
| 544 |
|
|
public void setValue (int index, String value)
|
| 545 |
|
|
{
|
| 546 |
|
|
if (index >= 0 && index < length) {
|
| 547 |
|
|
data[index*5+4] = value;
|
| 548 |
|
|
} else {
|
| 549 |
|
|
badIndex(index);
|
| 550 |
|
|
}
|
| 551 |
|
|
}
|
| 552 |
|
|
|
| 553 |
|
|
|
| 554 |
|
|
|
| 555 |
|
|
////////////////////////////////////////////////////////////////////
|
| 556 |
|
|
// Internal methods.
|
| 557 |
|
|
////////////////////////////////////////////////////////////////////
|
| 558 |
|
|
|
| 559 |
|
|
|
| 560 |
|
|
/**
|
| 561 |
|
|
* Ensure the internal array's capacity.
|
| 562 |
|
|
*
|
| 563 |
|
|
* @param n The minimum number of attributes that the array must
|
| 564 |
|
|
* be able to hold.
|
| 565 |
|
|
*/
|
| 566 |
|
|
private void ensureCapacity (int n) {
|
| 567 |
|
|
if (n <= 0) {
|
| 568 |
|
|
return;
|
| 569 |
|
|
}
|
| 570 |
|
|
int max;
|
| 571 |
|
|
if (data == null || data.length == 0) {
|
| 572 |
|
|
max = 25;
|
| 573 |
|
|
}
|
| 574 |
|
|
else if (data.length >= n * 5) {
|
| 575 |
|
|
return;
|
| 576 |
|
|
}
|
| 577 |
|
|
else {
|
| 578 |
|
|
max = data.length;
|
| 579 |
|
|
}
|
| 580 |
|
|
while (max < n * 5) {
|
| 581 |
|
|
max *= 2;
|
| 582 |
|
|
}
|
| 583 |
|
|
|
| 584 |
|
|
String newData[] = new String[max];
|
| 585 |
|
|
if (length > 0) {
|
| 586 |
|
|
System.arraycopy(data, 0, newData, 0, length*5);
|
| 587 |
|
|
}
|
| 588 |
|
|
data = newData;
|
| 589 |
|
|
}
|
| 590 |
|
|
|
| 591 |
|
|
|
| 592 |
|
|
/**
|
| 593 |
|
|
* Report a bad array index in a manipulator.
|
| 594 |
|
|
*
|
| 595 |
|
|
* @param index The index to report.
|
| 596 |
|
|
* @exception java.lang.ArrayIndexOutOfBoundsException Always.
|
| 597 |
|
|
*/
|
| 598 |
|
|
private void badIndex (int index)
|
| 599 |
|
|
throws ArrayIndexOutOfBoundsException
|
| 600 |
|
|
{
|
| 601 |
|
|
String msg =
|
| 602 |
|
|
"Attempt to modify attribute at illegal index: " + index;
|
| 603 |
|
|
throw new ArrayIndexOutOfBoundsException(msg);
|
| 604 |
|
|
}
|
| 605 |
|
|
|
| 606 |
|
|
|
| 607 |
|
|
|
| 608 |
|
|
////////////////////////////////////////////////////////////////////
|
| 609 |
|
|
// Internal state.
|
| 610 |
|
|
////////////////////////////////////////////////////////////////////
|
| 611 |
|
|
|
| 612 |
|
|
int length;
|
| 613 |
|
|
String data [];
|
| 614 |
|
|
|
| 615 |
|
|
}
|
| 616 |
|
|
|
| 617 |
|
|
// end of AttributesImpl.java
|
