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jeremybenn |
// Attributes2Impl.java - extended AttributesImpl
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// http://www.saxproject.org
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// Public Domain: no warranty.
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// $Id: Attributes2Impl.java,v 1.1 2004/12/23 22:38:42 mark Exp $
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package org.xml.sax.ext;
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import org.xml.sax.Attributes;
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import org.xml.sax.helpers.AttributesImpl;
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/**
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* SAX2 extension helper for additional Attributes information,
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* implementing the {@link Attributes2} 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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* </blockquote>
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*
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* <p>This is not part of core-only SAX2 distributions.</p>
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*
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* <p>The <em>specified</em> flag for each attribute will always
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* be true, unless it has been set to false in the copy constructor
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* or using {@link #setSpecified}.
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* Similarly, the <em>declared</em> flag for each attribute will
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* always be false, except for defaulted attributes (<em>specified</em>
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* is false), non-CDATA attributes, or when it is set to true using
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* {@link #setDeclared}.
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* If you change an attribute's type by hand, you may need to modify
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* its <em>declared</em> flag to match.
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* </p>
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*
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* @since SAX 2.0 (extensions 1.1 alpha)
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* @author David Brownell
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* @version TBS
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*/
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public class Attributes2Impl extends AttributesImpl implements Attributes2
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{
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private boolean declared [];
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private boolean specified [];
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/**
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* Construct a new, empty Attributes2Impl object.
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*/
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public Attributes2Impl () { }
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/**
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* Copy an existing Attributes or Attributes2 object.
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* If the object implements Attributes2, values of the
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* <em>specified</em> and <em>declared</em> flags for each
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* attribute are copied.
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* Otherwise the flag values are defaulted to assume no DTD was used,
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* unless there is evidence to the contrary (such as attributes with
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* type other than CDATA, which must have been <em>declared</em>).
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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 Attributes2Impl (Attributes atts)
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{
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super (atts);
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}
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////////////////////////////////////////////////////////////////////
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// Implementation of Attributes2
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////////////////////////////////////////////////////////////////////
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/**
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* Returns the current value of the attribute's "declared" flag.
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*/
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// javadoc mostly from interface
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public boolean isDeclared (int index)
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{
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if (index < 0 || index >= getLength ())
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throw new ArrayIndexOutOfBoundsException (
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"No attribute at index: " + index);
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return declared [index];
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}
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/**
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* Returns the current value of the attribute's "declared" flag.
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*/
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// javadoc mostly from interface
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public boolean isDeclared (String uri, String localName)
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{
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int index = getIndex (uri, localName);
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if (index < 0)
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throw new IllegalArgumentException (
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"No such attribute: local=" + localName
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+ ", namespace=" + uri);
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return declared [index];
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}
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/**
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* Returns the current value of the attribute's "declared" flag.
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*/
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// javadoc mostly from interface
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public boolean isDeclared (String qName)
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{
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int index = getIndex (qName);
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if (index < 0)
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throw new IllegalArgumentException (
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"No such attribute: " + qName);
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return declared [index];
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}
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/**
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* Returns the current value of an attribute's "specified" flag.
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*
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* @param index The attribute index (zero-based).
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* @return current flag value
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* @exception java.lang.ArrayIndexOutOfBoundsException When the
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* supplied index does not identify an attribute.
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*/
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public boolean isSpecified (int index)
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{
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if (index < 0 || index >= getLength ())
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throw new ArrayIndexOutOfBoundsException (
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"No attribute at index: " + index);
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return specified [index];
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}
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/**
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* Returns the current value of an attribute's "specified" flag.
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*
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* @param uri The Namespace URI, or the empty string if
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* the name has no Namespace URI.
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* @param localName The attribute's local name.
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* @return current flag value
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* @exception java.lang.IllegalArgumentException When the
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* supplied names do not identify an attribute.
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*/
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public boolean isSpecified (String uri, String localName)
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{
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int index = getIndex (uri, localName);
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if (index < 0)
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throw new IllegalArgumentException (
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"No such attribute: local=" + localName
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+ ", namespace=" + uri);
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return specified [index];
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}
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/**
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* Returns the current value of an attribute's "specified" flag.
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*
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* @param qName The XML qualified (prefixed) name.
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* @return current flag value
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* @exception java.lang.IllegalArgumentException When the
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* supplied name does not identify an attribute.
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*/
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public boolean isSpecified (String qName)
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{
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int index = getIndex (qName);
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if (index < 0)
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throw new IllegalArgumentException (
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"No such attribute: " + qName);
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return specified [index];
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}
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////////////////////////////////////////////////////////////////////
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// Manipulators
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////////////////////////////////////////////////////////////////////
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/**
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* Copy an entire Attributes object. The "specified" flags are
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* assigned as true, and "declared" flags as false (except when
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* an attribute's type is not CDATA),
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* unless the object is an Attributes2 object.
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* In that case those flag values are all copied.
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*
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* @see AttributesImpl#setAttributes
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*/
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public void setAttributes (Attributes atts)
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{
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int length = atts.getLength ();
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super.setAttributes (atts);
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declared = new boolean [length];
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specified = new boolean [length];
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if (atts instanceof Attributes2) {
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Attributes2 a2 = (Attributes2) atts;
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for (int i = 0; i < length; i++) {
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declared [i] = a2.isDeclared (i);
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specified [i] = a2.isSpecified (i);
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}
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} else {
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for (int i = 0; i < length; i++) {
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declared [i] = !"CDATA".equals (atts.getType (i));
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specified [i] = true;
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}
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}
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}
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/**
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* Add an attribute to the end of the list, setting its
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* "specified" flag to true. To set that flag's value
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* to false, use {@link #setSpecified}.
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*
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* <p>Unless the attribute <em>type</em> is CDATA, this attribute
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* is marked as being declared in the DTD. To set that flag's value
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* to true for CDATA attributes, use {@link #setDeclared}.
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*
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* @see AttributesImpl#addAttribute
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*/
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public void addAttribute (String uri, String localName, String qName,
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String type, String value)
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{
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super.addAttribute (uri, localName, qName, type, value);
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int length = getLength ();
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if (length < specified.length) {
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boolean newFlags [];
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newFlags = new boolean [length];
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System.arraycopy (declared, 0, newFlags, 0, declared.length);
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declared = newFlags;
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newFlags = new boolean [length];
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System.arraycopy (specified, 0, newFlags, 0, specified.length);
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specified = newFlags;
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}
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specified [length - 1] = true;
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declared [length - 1] = !"CDATA".equals (type);
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}
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// javadoc entirely from superclass
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public void removeAttribute (int index)
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{
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int origMax = getLength () - 1;
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super.removeAttribute (index);
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if (index != origMax) {
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System.arraycopy (declared, index + 1, declared, index,
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origMax - index);
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System.arraycopy (specified, index + 1, specified, index,
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origMax - index);
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}
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}
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/**
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* Assign a value to the "declared" flag of a specific attribute.
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* This is normally needed only for attributes of type CDATA,
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* including attributes whose type is changed to or from CDATA.
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*
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* @param index The index of the attribute (zero-based).
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* @param value The desired flag value.
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* @exception java.lang.ArrayIndexOutOfBoundsException When the
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* supplied index does not identify an attribute.
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* @see #setType
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*/
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public void setDeclared (int index, boolean value)
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{
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if (index < 0 || index >= getLength ())
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throw new ArrayIndexOutOfBoundsException (
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"No attribute at index: " + index);
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declared [index] = value;
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}
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/**
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* Assign a value to the "specified" flag of a specific attribute.
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* This is the only way this flag can be cleared, except clearing
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* by initialization with the copy constructor.
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*
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* @param index The index of the attribute (zero-based).
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* @param value The desired flag value.
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* @exception java.lang.ArrayIndexOutOfBoundsException When the
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* supplied index does not identify an attribute.
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*/
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public void setSpecified (int index, boolean value)
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{
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if (index < 0 || index >= getLength ())
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throw new ArrayIndexOutOfBoundsException (
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"No attribute at index: " + index);
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specified [index] = value;
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}
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}
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