Checkin external modules: SAX 2.0 r2 prerelease; SAX2-ext 1.0
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// Attributes.java - attribute list with Namespace support
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// Written by David Megginson, sax@megginson.com
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// NO WARRANTY! This class is in the public domain.
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// $Id$
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package org.xml.sax;
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/**
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* Interface for a list of XML attributes.
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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 interface allows access to a list of attributes in
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* three different ways:</p>
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*
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* <ol>
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* <li>by attribute index;</li>
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* <li>by Namespace-qualified name; or</li>
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* <li>by qualified (prefixed) name.</li>
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* </ol>
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*
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* <p>The list will not contain attributes that were declared
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* #IMPLIED but not specified in the start tag. It will also not
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* contain attributes used as Namespace declarations (xmlns*) unless
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* the <code>http://xml.org/sax/features/namespace-prefixes</code>
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* feature is set to <var>true</var> (it is <var>false</var> by
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* default).</p>
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*
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* <p>If the namespace-prefixes feature (see above) is <var>false</var>,
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* access by qualified name may not be available; if the
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* <code>http://xml.org/sax/features/namespaces</code>
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* feature is <var>false</var>, access by Namespace-qualified names
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* may not be available.</p>
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*
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* <p>This interface replaces the now-deprecated SAX1 {@link
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* org.xml.sax.AttributeList AttributeList} interface, which does not
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* contain Namespace support. In addition to Namespace support, it
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* adds the <var>getIndex</var> methods (below).</p>
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*
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* <p>The order of attributes in the list is unspecified, and will
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* vary from implementation to implementation.</p>
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*
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* @since SAX 2.0
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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 2.0r2pre
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* @see org.xml.sax.helpers.AttributeListImpl
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*/
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public interface Attributes
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{
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////////////////////////////////////////////////////////////////////
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// Indexed access.
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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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* <p>Once you know the number of attributes, you can iterate
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* through the list.</p>
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*
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* @return The number of attributes in the list.
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* @see #getURI(int)
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* @see #getLocalName(int)
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* @see #getQName(int)
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* @see #getType(int)
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* @see #getValue(int)
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*/
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public abstract int getLength ();
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/**
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* Look up an attribute's Namespace URI by index.
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*
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* @param index The attribute index (zero-based).
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* @return The Namespace URI, or the empty string if none
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* is available, or null if the index is out of
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* range.
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* @see #getLength
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*/
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public abstract String getURI (int index);
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/**
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* Look up an attribute's local name by index.
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*
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* @param index The attribute index (zero-based).
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* @return The local name, or the empty string if Namespace
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* processing is not being performed, or null
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* if the index is out of range.
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* @see #getLength
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*/
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public abstract String getLocalName (int index);
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/**
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* Look up an attribute's XML 1.0 qualified name by index.
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*
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* @param index The attribute index (zero-based).
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* @return The XML 1.0 qualified name, or the empty string
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* if none is available, or null if the index
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* is out of range.
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* @see #getLength
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*/
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public abstract String getQName (int index);
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/**
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* Look up an attribute's type by index.
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*
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* <p>The attribute type is one of the strings "CDATA", "ID",
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* "IDREF", "IDREFS", "NMTOKEN", "NMTOKENS", "ENTITY", "ENTITIES",
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* or "NOTATION" (always in upper case).</p>
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*
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* <p>If the parser has not read a declaration for the attribute,
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* or if the parser does not report attribute types, then it must
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* return the value "CDATA" as stated in the XML 1.0 Recommentation
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* (clause 3.3.3, "Attribute-Value Normalization").</p>
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*
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* <p>For an enumerated attribute that is not a notation, the
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* parser will report the type as "NMTOKEN".</p>
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*
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* @param index The attribute index (zero-based).
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* @return The attribute's type as a string, or null if the
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* index is out of range.
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* @see #getLength
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*/
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public abstract String getType (int index);
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/**
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* Look up an attribute's value by index.
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*
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* <p>If the attribute value is a list of tokens (IDREFS,
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* ENTITIES, or NMTOKENS), the tokens will be concatenated
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* into a single string with each token separated by a
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* single space.</p>
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*
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* @param index The attribute index (zero-based).
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* @return The attribute's value as a string, or null if the
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* index is out of range.
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* @see #getLength
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*/
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public abstract String getValue (int index);
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////////////////////////////////////////////////////////////////////
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// Name-based query.
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////////////////////////////////////////////////////////////////////
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/**
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* Look up the index of an attribute by Namespace name.
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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 The index of the attribute, or -1 if it does not
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* appear in the list.
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*/
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public int getIndex (String uri, String localName);
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/**
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* Look up the index of an attribute by XML 1.0 qualified name.
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*
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* @param qName The qualified (prefixed) name.
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* @return The index of the attribute, or -1 if it does not
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* appear in the list.
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*/
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public int getIndex (String qName);
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/**
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* Look up an attribute's type by Namespace name.
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*
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* <p>See {@link #getType(int) getType(int)} for a description
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* of the possible types.</p>
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*
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* @param uri The Namespace URI, or the empty String if the
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* name has no Namespace URI.
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* @param localName The local name of the attribute.
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* @return The attribute type as a string, or null if the
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* attribute is not in the list or if Namespace
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* processing is not being performed.
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*/
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public abstract String getType (String uri, String localName);
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/**
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* Look up an attribute's type by XML 1.0 qualified name.
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*
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* <p>See {@link #getType(int) getType(int)} for a description
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* of the possible types.</p>
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*
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* @param qName The XML 1.0 qualified name.
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* @return The attribute type as a string, or null if the
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* attribute is not in the list or if qualified names
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* are not available.
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*/
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public abstract String getType (String qName);
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/**
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* Look up an attribute's value by Namespace name.
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*
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* <p>See {@link #getValue(int) getValue(int)} for a description
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* of the possible values.</p>
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*
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* @param uri The Namespace URI, or the empty String if the
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* name has no Namespace URI.
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* @param localName The local name of the attribute.
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* @return The attribute value as a string, or null if the
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* attribute is not in the list.
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*/
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public abstract String getValue (String uri, String localName);
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/**
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* Look up an attribute's value by XML 1.0 qualified name.
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*
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* <p>See {@link #getValue(int) getValue(int)} for a description
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* of the possible values.</p>
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*
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* @param qName The XML 1.0 qualified name.
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* @return The attribute value as a string, or null if the
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* attribute is not in the list or if qualified names
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* are not available.
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*/
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public abstract String getValue (String qName);
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}
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// end of Attributes.java
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