mirror of git://gcc.gnu.org/git/gcc.git
311 lines
8.9 KiB
Java
311 lines
8.9 KiB
Java
// SAX default implementation for AttributeList.
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// No warranty; no copyright -- use this as you will.
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// $Id: AttributeListImpl.java,v 1.1 2000/10/02 02:43:20 sboag Exp $
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package org.xml.sax.helpers;
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import org.xml.sax.AttributeList;
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import java.util.Vector;
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/**
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* Default implementation for AttributeList.
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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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* </blockquote>
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*
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* <p>AttributeList implements the deprecated SAX1 {@link
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* org.xml.sax.AttributeList AttributeList} interface, and has been
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* replaced by the new SAX2 {@link org.xml.sax.helpers.AttributesImpl
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* AttributesImpl} interface.</p>
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*
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* <p>This class provides a convenience implementation of the SAX
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* {@link org.xml.sax.AttributeList AttributeList} interface. This
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* implementation is useful both for SAX parser writers, who can use
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* it to provide attributes to the application, and for SAX application
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* writers, who can use it to create a persistent copy of an element's
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* attribute specifications:</p>
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*
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* <pre>
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* private AttributeList myatts;
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*
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* public void startElement (String name, AttributeList atts)
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* {
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* // create a persistent copy of the attribute list
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* // for use outside this method
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* myatts = new AttributeListImpl(atts);
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* [...]
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* }
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* </pre>
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*
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* <p>Please note that SAX parsers are not required to use this
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* class to provide an implementation of AttributeList; it is
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* supplied only as an optional convenience. In particular,
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* parser writers are encouraged to invent more efficient
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* implementations.</p>
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*
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* @deprecated This class implements a deprecated interface,
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* {@link org.xml.sax.AttributeList AttributeList};
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* that interface has been replaced by
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* {@link org.xml.sax.Attributes Attributes},
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* which is implemented in the
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* {@link org.xml.sax.helpers.AttributesImpl
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* AttributesImpl} helper class.
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* @since SAX 1.0
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* @author David Megginson,
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* <a href="mailto:sax@megginson.com">sax@megginson.com</a>
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* @version 2.0
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* @see org.xml.sax.AttributeList
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* @see org.xml.sax.DocumentHandler#startElement
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*/
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public class AttributeListImpl implements AttributeList
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{
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/**
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* Create an empty attribute list.
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*
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* <p>This constructor is most useful for parser writers, who
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* will use it to create a single, reusable attribute list that
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* can be reset with the clear method between elements.</p>
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*
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* @see #addAttribute
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* @see #clear
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*/
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public AttributeListImpl ()
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{
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}
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/**
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* Construct a persistent copy of an existing attribute list.
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*
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* <p>This constructor is most useful for application writers,
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* who will use it to create a persistent copy of an existing
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* attribute list.</p>
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*
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* @param atts The attribute list to copy
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* @see org.xml.sax.DocumentHandler#startElement
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*/
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public AttributeListImpl (AttributeList atts)
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{
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setAttributeList(atts);
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}
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////////////////////////////////////////////////////////////////////
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// Methods specific to this class.
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////////////////////////////////////////////////////////////////////
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/**
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* Set the attribute list, discarding previous contents.
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*
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* <p>This method allows an application writer to reuse an
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* attribute list easily.</p>
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*
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* @param atts The attribute list to copy.
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*/
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public void setAttributeList (AttributeList atts)
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{
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int count = atts.getLength();
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clear();
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for (int i = 0; i < count; i++) {
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addAttribute(atts.getName(i), atts.getType(i), atts.getValue(i));
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}
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}
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/**
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* Add an attribute to an attribute list.
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*
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* <p>This method is provided for SAX parser writers, to allow them
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* to build up an attribute list incrementally before delivering
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* it to the application.</p>
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*
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* @param name The attribute name.
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* @param type The attribute type ("NMTOKEN" for an enumeration).
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* @param value The attribute value (must not be null).
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* @see #removeAttribute
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* @see org.xml.sax.DocumentHandler#startElement
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*/
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public void addAttribute (String name, String type, String value)
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{
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names.addElement(name);
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types.addElement(type);
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values.addElement(value);
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}
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/**
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* Remove an attribute from the list.
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*
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* <p>SAX application writers can use this method to filter an
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* attribute out of an AttributeList. Note that invoking this
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* method will change the length of the attribute list and
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* some of the attribute's indices.</p>
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*
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* <p>If the requested attribute is not in the list, this is
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* a no-op.</p>
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*
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* @param name The attribute name.
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* @see #addAttribute
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*/
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public void removeAttribute (String name)
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{
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int i = names.indexOf(name);
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if (i >= 0) {
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names.removeElementAt(i);
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types.removeElementAt(i);
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values.removeElementAt(i);
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}
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}
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/**
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* Clear the attribute list.
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*
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* <p>SAX parser writers can use this method to reset the attribute
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* list between DocumentHandler.startElement events. Normally,
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* it will make sense to reuse the same AttributeListImpl object
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* rather than allocating a new one each time.</p>
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*
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* @see org.xml.sax.DocumentHandler#startElement
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*/
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public void clear ()
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{
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names.removeAllElements();
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types.removeAllElements();
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values.removeAllElements();
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}
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////////////////////////////////////////////////////////////////////
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// Implementation of org.xml.sax.AttributeList
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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.AttributeList#getLength
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*/
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public int getLength ()
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{
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return names.size();
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}
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/**
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* Get the name of an attribute (by position).
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*
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* @param i The position of the attribute in the list.
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* @return The attribute name as a string, or null if there
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* is no attribute at that position.
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* @see org.xml.sax.AttributeList#getName(int)
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*/
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public String getName (int i)
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{
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if (i < 0) {
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return null;
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}
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try {
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return (String)names.elementAt(i);
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} catch (ArrayIndexOutOfBoundsException e) {
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return null;
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}
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}
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/**
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* Get the type of an attribute (by position).
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*
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* @param i The position of the attribute in the list.
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* @return The attribute type as a string ("NMTOKEN" for an
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* enumeration, and "CDATA" if no declaration was
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* read), or null if there is no attribute at
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* that position.
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* @see org.xml.sax.AttributeList#getType(int)
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*/
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public String getType (int i)
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{
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if (i < 0) {
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return null;
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}
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try {
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return (String)types.elementAt(i);
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} catch (ArrayIndexOutOfBoundsException e) {
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return null;
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}
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}
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/**
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* Get the value of an attribute (by position).
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*
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* @param i The position of the attribute in the list.
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* @return The attribute value as a string, or null if
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* there is no attribute at that position.
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* @see org.xml.sax.AttributeList#getValue(int)
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*/
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public String getValue (int i)
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{
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if (i < 0) {
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return null;
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}
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try {
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return (String)values.elementAt(i);
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} catch (ArrayIndexOutOfBoundsException e) {
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return null;
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}
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}
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/**
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* Get the type of an attribute (by name).
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*
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* @param name The attribute name.
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* @return The attribute type as a string ("NMTOKEN" for an
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* enumeration, and "CDATA" if no declaration was
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* read).
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* @see org.xml.sax.AttributeList#getType(java.lang.String)
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*/
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public String getType (String name)
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{
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return getType(names.indexOf(name));
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}
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/**
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* Get the value of an attribute (by name).
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*
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* @param name The attribute name.
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* @see org.xml.sax.AttributeList#getValue(java.lang.String)
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*/
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public String getValue (String name)
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{
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return getValue(names.indexOf(name));
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}
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////////////////////////////////////////////////////////////////////
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// Internal state.
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////////////////////////////////////////////////////////////////////
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Vector names = new Vector();
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Vector types = new Vector();
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Vector values = new Vector();
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}
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// end of AttributeListImpl.java
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