com.topologi.diffx.xml.sax.XMLWriterSAX Maven / Gradle / Ivy
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/*
* This file is part of the DiffX library.
*
* For licensing information please see the file license.txt included in the release.
* A copy of this licence can also be found at
* http://www.opensource.org/licenses/artistic-license-2.0.php
*/
package com.topologi.diffx.xml.sax;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.List;
import org.xml.sax.Attributes;
import org.xml.sax.ContentHandler;
import org.xml.sax.SAXException;
import com.topologi.diffx.xml.IllegalCloseElementException;
import com.topologi.diffx.xml.UnclosedElementException;
import com.topologi.diffx.xml.UndeclaredNamespaceException;
import com.topologi.diffx.xml.XMLWriter;
import com.topologi.diffx.xml.XMLWriterNSImpl;
/**
* An XML writer that generates SAX2 events.
*
* Provides methods to generate well-formed XML data easily through SAX events
* by wrapping a content handler.
*
*
This XML writer provides an efficient way to process XML bypassing the need to create
* an XML stream. Instead, this class will wrap a {@link org.xml.sax.ContentHandler} and
* invoke the SAX2 methods.
*
*
* ContentHandler myContentHandler = ...;
* XMLWriter saxWriter = new XMLWriterSAX(myContentHandler);
*
*
* This SAX event writer as the following features:
*
* - http://xml.org/sax/features/namespaces set to
true
* - http://xml.org/sax/features/namespace-prefixes set to
false
*
*
* Consequently, the attributes will not contain attributes used for namespace
* declarations (xmlns* attributes).
*
*
This implementation does not provide qualified names, and will always return "".
*
*
The ContentHandler's startDocument and endDocument methods
* have to be called externally.
*
*
Note that the write methods do not necessarily correspond to the content handler
* methods or at least they may not be invoked at the same time. For example, the
* attribute methods will not generate any event until it is possible to
* invoke the ContentHandler#startElement method.
*
* @author Christophe Lauret
* @version 15 January 2007
*/
public final class XMLWriterSAX implements XMLWriter {
// constants ----------------------------------------------------------------------------
/**
* Set to true to show debug info.
*/
private static final boolean DEBUG = false;
/**
* The default namespace mapped to the empty prefix.
*/
private static final PrefixMapping DEFAULT_NS = new PrefixMapping("", "");
/**
* The root node.
*/
private static final Element ROOT;
static {
List mps = new ArrayList();
mps.add(DEFAULT_NS);
ROOT = new Element("", "", true, mps);
}
/**
* The new line constant.
*/
private static final char[] NEW_LINE = new char[]{'\n'};
// class attributes ---------------------------------------------------------------------
/**
* Where the XML data goes.
*/
private final ContentHandler handler;
/**
* Indicates whether the xml should be indented or not.
*
* The default is true (indented).
*
*
The indentation is 2 white-spaces.
*/
private boolean indent;
/**
* The default indentation spaces used.
*/
private char[] indentChars;
// state variables ----------------------------------------------------------------------
/**
* Level of the depth of the xml document currently produced.
*
*
This attribute changes depending on the state of the instance.
*/
private transient int depth;
/**
* Flag to indicate that the element open tag is not finished yet.
*/
private transient boolean isNude;
/**
* The current prefix mapping.
*/
private transient Hashtable prefixMapping = new Hashtable();
/**
* The list of prefix mappings to be associated with the next element.
*/
private transient List tempMapping;
/**
* A stack of elements to close the elements automatically.
*/
private transient List elements = new ArrayList();
/**
* The attributes attached to the current open element.
*
* This variable can be null and should be set to null,
* after the startElementMethod has been invoked.
*/
private transient AttributesImpl attributes = new AttributesImpl();
// constructors -------------------------------------------------------------------------
/**
*
Creates a new XML writer.
*
* @param handler The SAX2 content handler to use.
*
* @throws NullPointerException If the handler is null.
*/
public XMLWriterSAX(ContentHandler handler) throws NullPointerException {
if (handler == null)
throw new NullPointerException("XMLWriter cannot use a null content handler.");
this.handler = handler;
this.elements.add(ROOT);
this.prefixMapping.put("", "");
}
// setup methods ------------------------------------------------------------------------
/**
* Does nothing.
*/
@Override
public void xmlDecl() {
}
/**
* {@inheritDoc}
*/
@Override
public void setIndentChars(String spaces) throws IllegalStateException, IllegalArgumentException {
if (this.depth != 0)
throw new IllegalStateException("To late to set the indentation characters!");
// check that this is a valid indentation string
if (spaces != null) {
for (int i = 0; i < spaces.length(); i++) {
if (!Character.isSpaceChar(spaces.charAt(i)))
throw new IllegalArgumentException("Not a valid indentation string.");
}
this.indentChars = spaces.toCharArray();
}
// update the flags
this.indent = spaces != null;
}
// write text methods -------------------------------------------------------------------
/**
* {@inheritDoc}
*/
@Override
public void writeText(String text) throws IOException {
if (text == null) return;
try {
deNude();
this.handler.characters(text.toCharArray(), 0, text.length());
} catch (SAXException ex) {
handleEx(ex);
}
}
/**
* {@inheritDoc}
*/
@Override
public void writeText(char[] text, int off, int len) throws IOException {
try {
deNude();
this.handler.characters(text, off, len);
} catch (SAXException ex) {
handleEx(ex);
}
}
/**
* {@inheritDoc}
*/
@Override
public void writeText(char c) throws IOException {
try {
deNude();
this.handler.characters(new char[] {c}, 0, 1);
} catch (SAXException ex) {
handleEx(ex);
}
}
/**
* Writes the string value of an object.
*
*
Does nothing if the object is null.
*
* @see Object#toString
* @see #writeText(java.lang.String)
*
* @param o The object that should be written as text.
*
* @throws IOException If thrown by the wrapped writer.
*/
public void writeText(Object o) throws IOException {
// TODO: what about an XML serializable ???
// TODO: Add to interface ???
if (o != null) {
this.writeText(o.toString());
}
}
@Override
public void writeCDATA(String data) throws IOException {
if (data == null) return;
try {
deNude();
this.handler.characters(data.toCharArray(), 0, data.length());
} catch (SAXException ex) {
handleEx(ex);
}
}
// write xml methods are not supported --------------------------------------------------
/**
* Always throw an UnsupportedOperationException exception.
*
* {@inheritDoc}
*/
@Override
public void writeXML(String text) throws UnsupportedOperationException {
throw new UnsupportedOperationException("Cannot run unparsed XML as SAX events");
}
/**
* Always throw an UnsupportedOperationException exception.
*
* {@inheritDoc}
*/
@Override
public void writeXML(char[] text, int off, int len)
throws UnsupportedOperationException {
throw new UnsupportedOperationException("Cannot run unparsed XML as SAX events");
}
// PI and comments ----------------------------------------------------------------------
/**
* Does nothing as SAX content handler do not handle comments.
*
* {@inheritDoc}
*/
@Override
public void writeComment(String comment) {
}
/**
* {@inheritDoc}
*/
@Override
public void writePI(String target, String data) throws IOException {
try {
deNude();
this.handler.processingInstruction(target, data);
if (this.indent) {
newLine();
}
} catch (SAXException ex) {
handleEx(ex);
}
}
// attribute methods --------------------------------------------------------------------
/**
* {@inheritDoc}
*/
@Override
public void attribute(String name, String value) throws IOException {
if (!this.isNude)
throw new IllegalStateException("Cannot write attribute: too late!");
this.attributes.addAttribute(name, value);
}
/**
* {@inheritDoc}
*/
@Override
public void attribute(String name, int value) throws IOException {
if (!this.isNude)
throw new IllegalStateException("Cannot write attribute: too late!");
this.attributes.addAttribute(name, Integer.toString(value));
}
/**
* Writes an attribute.
*
* @param uri The namespace URI this attribute belongs to.
* @param name The name of the attribute.
* @param value The value of the attribute.
*
* @throws IOException If thrown by the wrapped writer.
* @throws IllegalStateException If there is no open element or text has been written.
*/
@Override
public void attribute(String uri, String name, String value) throws IOException {
if (!this.isNude) throw new IllegalStateException("Cannot write attribute: too late!");
// TODO: check declared
this.attributes.addAttribute(uri, name, value);
}
/**
* Writes an attribute.
*
*
This method for number does not require escaping.
*
* @param uri The namespace URI this attribute belongs to.
* @param name The name of the attribute.
* @param value The value of the attribute.
*
* @throws IOException If thrown by the wrapped writer.
* @throws IllegalStateException If there is no open element or text has been written.
*/
@Override
public void attribute(String uri, String name, int value) throws IOException {
if (!this.isNude) throw new IllegalStateException("Cannot write attribute: too late!");
// TODO: check declared
this.attributes.addAttribute(uri, name, Integer.toString(value));
}
// open/close specific elements ---------------------------------------------------------
/**
* Writes the angle bracket if the element open tag is not finished.
*
* @throws SAXException If thrown by the content handler
*/
private void deNude() throws SAXException {
if (this.isNude) {
indent();
Element elt = peekElement();
// report the prefix mapping
if (elt.mappings != null) {
for (int i = 0; i < elt.mappings.size(); i++) {
PrefixMapping pm = elt.mappings.get(i);
this.handler.startPrefixMapping(pm.prefix, pm.uri);
}
}
this.handler.startElement(elt.uri, elt.name, getQName(elt.uri, elt.name), this.attributes);
this.attributes = new AttributesImpl();
if (this.indent && elt.hasChildren) {
newLine();
}
this.isNude = false;
}
}
/**
* Writes a start element tag correctly indented.
*
*
It is the same as openElement("", name, false)
*
* @see #openElement(java.lang.String, java.lang.String, boolean)
*
* @param name the name of the element
*
* @throws IOException If thrown by the wrapped writer.
*/
@Override
public void openElement(String name) throws IOException {
openElement("", name, false);
}
/**
* Write a start element tag correctly indented.
*
*
It is the same as openElement(name, false)
*
* @see #openElement(java.lang.String, boolean)
*
* @param uri The namespace URI of this element.
* @param name The name of the element.
*
* @throws IOException If thrown by the wrapped writer.
*/
public void openElement(String uri, String name) throws IOException {
openElement(uri, name, false);
}
/**
* Writes a start element tag correctly indented.
*
*
Use the hasChildren parameter to specify whether this element is terminal
* node or not, note: this affects the indenting. To produce correctly indented XML, you
* should use the same value for this flag when closing the element.
*
*
The name can contain attributes and should be a valid xml name.
*
* @param name The name of the element.
* @param hasChildren true if this element has children.
*
* @throws IOException If thrown by the wrapped writer.
*/
@Override
public void openElement(String name, boolean hasChildren) throws IOException {
openElement("", name, hasChildren);
}
/**
* Writes a start element tag correctly indented.
*
*
Use the hasChildren parameter to specify whether this element is terminal
* node or not, note: this affects the indenting. To produce correctly indented XML, you
* should use the same value for this flag when closing the element.
*
*
The name can contain attributes and should be a valid xml name.
*
* @param uri The namespace URI of this element.
* @param name The name of the element.
* @param hasChildren true if this element has children.
*
* @throws IOException If thrown by the wrapped writer.
*/
@Override
public void openElement(String uri, String name, boolean hasChildren) throws IOException {
try {
deNude();
} catch (SAXException ex) {
handleEx(ex);
}
this.elements.add(new Element(uri, name, hasChildren, this.tempMapping));
this.tempMapping = null;
this.isNude = true;
this.depth++;
}
/**
* {@inheritDoc}
*/
@Override
public void element(String name, String text) throws IOException {
this.openElement(name);
this.writeText(text);
closeElement();
}
// direct access to the writer ----------------------------------------------------------
/**
* Does nothing.
*/
@Override
public void flush() {
}
// base class and convenience methods ---------------------------------------------------
/**
* Insert the correct amount of space characters depending on the depth and if
* the indent flag is set to true.
*
* @throws SAXException If thrown by the SAX handler.
*/
private void indent() throws SAXException {
if (this.indent) {
char[] ch = new char[this.depth * this.indentChars.length];
for (int i = 0; i < this.depth; i++) {
for (int j = 0; j < this.indentChars.length; j++) {
ch[i * this.indentChars.length + j] = this.indentChars[j];
}
}
this.handler.ignorableWhitespace(ch, 0, ch.length);
}
}
// close specific elements ------------------------------------------------------------
/**
* Write an end element tag.
*
* @throws IOException If thrown by the wrapped writer.
*/
@Override
public void closeElement() throws IOException {
this.depth--;
// this is an empty element
try {
// make sure that we finish with open element
if (this.isNude) {
deNude();
}
// now we can close the element
Element elt = popElement();
// we reached the end of the document too early
if (elt == ROOT) throw new IllegalCloseElementException();
// the element contains text / has children
if (elt.hasChildren) {
indent();
}
this.handler.endElement(elt.uri, elt.name, getQName(elt.uri, elt.name));
// restore previous mapping if necessary
if (elt.mappings != null) {
for (int i = 0; i < elt.mappings.size(); i++) {
PrefixMapping pm = elt.mappings.get(i);
this.handler.endPrefixMapping(pm.prefix);
}
}
restorePrefixMapping(elt);
// take care of the new line if the indentation is on
if (this.indent) {
Element parent = peekElement();
if (parent.hasChildren && parent != ROOT) {
newLine();
}
}
} catch (SAXException ex) {
handleEx(ex);
}
}
/**
* Same as emptyElement(null, element);.
*
* @param element the name of the element
*
* @throws IOException If thrown by the wrapped writer.
*/
@Override
public void emptyElement(String element) throws IOException {
emptyElement(null, element);
}
/**
* Write an empty element.
*
*
It is possible for the element to contain attributes,
* however, since there is no character escaping, great care
* must be taken not to introduce invalid characters. For
* example:
*
* <example test="yes"/>
*
*
* @param uri The namespace URI for this element.
* @param element The name of the element.
*
* @throws IOException If thrown by the wrapped writer.
*/
@Override
public void emptyElement(String uri, String element) throws IOException {
try {
deNude();
indent();
this.handler.startElement(uri, element, "", new AttributesImpl());
this.handler.endElement(uri, element, "");
this.tempMapping = null;
newLine();
} catch (SAXException ex) {
handleEx(ex);
}
}
/**
* Returns the last element in the list.
*
* @return The current element.
*/
private Element peekElement() {
return this.elements.get(this.elements.size() - 1);
}
/**
* Removes the last element in the list.
*
* @return The current element.
*/
private Element popElement() {
return this.elements.remove(this.elements.size() - 1);
}
// namespace handling -----------------------------------------------------------------------
/**
* @see com.topologi.diffx.xml.XMLWriter#setPrefixMapping(java.lang.String, java.lang.String)
*
* This implementation does not keep a history of the prefix mappings so it needs to be
* reset. If a prefix is already being used it is overridden.
*
* @param uri The full namespace URI.
* @param prefix The prefix for the namespace uri.
*
* @throws NullPointerException if the prefix is null.
*/
@Override
public void setPrefixMapping(String uri, String prefix) throws NullPointerException {
//do not declare again if the same mapping already exist
if (!prefix.equals(this.prefixMapping.get(uri))) {
// remove the previous mapping to the prefix
removeIfNeeded(prefix);
// create the new prefix mapping
PrefixMapping pm = new PrefixMapping(prefix, uri);
this.prefixMapping.put(pm.uri, pm.prefix);
if (DEBUG) {
System.err.println(pm.prefix+" -> "+pm.uri);
}
if (this.tempMapping == null) {
this.tempMapping = new ArrayList();
}
this.tempMapping.add(pm);
}
}
/**
* Returns the qualified name for this element using the specified namespace URI.
*
* @param uri The namespace URI for the element.
* @param name The name of the element or attribute.
*
* @return The qualified element name.
*
* @throws UndeclaredNamespaceException If the uri has not being previously declared.
*/
private String getQName(String uri, String name) throws UndeclaredNamespaceException {
String prefix = this.prefixMapping.get(uri != null? uri : "");
if (prefix != null) {
if (!"".equals(prefix))
return this.prefixMapping.get(uri)+":"+name;
else
return name;
} else
throw new UndeclaredNamespaceException(uri);
}
/**
* Restores the prefix mapping after closing an element.
*
* This costly operation need only to be done if the method
* {@link XMLWriterNSImpl#setPrefixMapping(String, String)} have been used
* immediately before, therefore it should not happen often.
*
* @param elt The element that had some new mappings.
*/
private void restorePrefixMapping(Element elt) {
if (elt.mappings != null) {
// for each mapping of this element
for (int i = 0; i < elt.mappings.size(); i++) {
PrefixMapping mpi = elt.mappings.get(i);
if (DEBUG) {
System.err.print(mpi.prefix+" -< ");
}
// find the first previous namespace mapping amongst the parents
// that defines namespace mappings
for (int j = this.elements.size() - 1; j > 0; j--) {
if (this.elements.get(j).mappings != null) {
List mps = this.elements.get(j).mappings;
// iterate through the define namespace mappings of the parent
for (int k = 0; k < mps.size(); k++) {
PrefixMapping mpk = mps.get(k);
// if we found a namespace prefix for the namespace
if (mpk.prefix.equals(mpi.prefix)) {
removeIfNeeded(mpk.prefix);
this.prefixMapping.put(mpk.uri, mpk.prefix);
if (DEBUG) {
System.err.println(mpk.uri+" [R]");
}
j = 0; // exit from the previous loop
break; // exit from this one
}
}
}
}
}
}
}
/**
* Removes the mapping associated to the specified prefix.
*
* @param prefix The prefix which mapping should be removed.
*/
private void removeIfNeeded(String prefix) {
// remove the previous mapping to the prefix
if (this.prefixMapping.containsValue(prefix)) {
Object key = null;
for (Enumeration e = this.prefixMapping.keys(); e.hasMoreElements();) {
key = e.nextElement();
if (this.prefixMapping.get(key).equals(prefix)) {
break;
}
}
this.prefixMapping.remove(key); // we know key should have a value
}
}
/**
* Closes the writer.
*
* This method only checks that it is possible to close the writer.
*
* @throws IOException If thrown by the wrapped writer.
* @throws UnclosedElementException If an element has been left open.
*/
@Override
public void close() throws IOException, UnclosedElementException {
Element open = peekElement();
if (open != ROOT)
throw new UnclosedElementException(open.name);
}
/**
* Generates a new line as an ignorable white space event
*
* @throws SAXException If thrown by the handler.
*/
private void newLine() throws SAXException {
this.handler.characters(NEW_LINE, 0, 1);
}
/**
* Handles the SAX Exception.
*
* @param ex A SAXException thrown by the content handler.
*
* @throws IOException If thrown by the handler.
*/
private void handleEx(SAXException ex) throws IOException {
throw new IOException("Exception thrown by the wrapped content handler:\n"
+ex.getMessage());
}
// inner class: Element ---------------------------------------------------------------------
/**
* A light object to keep track of the elements
*
* @author Christophe Lauret (Allette Systems)
* @version 26 May 2005
*/
private static final class Element {
/**
* The namespace URI of the element.
*/
private final String uri;
/**
* The local name of the element.
*/
private final String name;
/**
* A list of prefix mappings for this element.
*
*
Can be null.
*/
private final List mappings;
/**
* Indicates whether the element has children.
*/
private final boolean hasChildren;
/**
* Creates a new Element.
*
* @param uri The namespace URI of the element.
* @param name The local name of the element.
* @param hasChildren Whether the element has children.
* @param mappings The list of prefix mapping if any.
*/
public Element(String uri, String name, boolean hasChildren, List mappings) {
this.uri = uri;
this.name = name;
this.hasChildren = hasChildren;
this.mappings = mappings;
}
}
// inner class: Prefix Mapping ----------------------------------------------------------
/**
* Light-weight class to represent a prefix mapping.
*
* The class attributes cannot be null.
*
* @author Christophe Lauret (Allette Systems)
* @version 31 August 2004
*/
private static final class PrefixMapping {
/**
* The prefix associated to the URI.
*/
private final String prefix;
/**
* The namespace URI.
*/
private final String uri;
/**
* Creates a new prefix mapping.
*
* @param prefix The prefix for the URI.
* @param uri The full namespace URI.
*/
public PrefixMapping(String prefix, String uri) {
this.prefix = prefix != null? prefix : "";
this.uri = uri != null? uri : "";
}
}
// inner class: SAX Attribute List implementation ---------------------------------------
/**
* A SAX attribute list implementation.
*
*
Note: the type of all attributes is CDATA.
*
* @author Christophe Lauret
* @version 25 May 2005
*/
private static final class AttributesImpl implements Attributes {
/**
* The only type used in this class.
*/
private static final String CDATA = "CDATA";
/**
* Namespace URIs of the attributes.
*/
private final List uris = new ArrayList();
/**
* QNames of the attributes.
*/
private final List names = new ArrayList();
/**
* Values of the attributes.
*/
private final List values = new ArrayList();
/**
* Creates an empty attribute list.
*/
public AttributesImpl() {
}
/**
* Adds an attribute to an attribute list.
*
* @param name The attribute name.
* @param value The attribute value (must not be null).
*
* @see #removeAttribute
* @see org.xml.sax.DocumentHandler#startElement
*/
public void addAttribute(String name, String value) {
this.uris.add("");
this.names.add(name);
this.values.add(value);
}
/**
* Adds an attribute to an attribute list.
*
* @param uri The namespace URI of the attribute
* @param name The attribute name.
* @param value The attribute value (must not be null).
*
* @see #removeAttribute
* @see org.xml.sax.DocumentHandler#startElement
*/
public void addAttribute(String uri, String name, String value) {
this.uris.add("");
this.names.add(name);
this.values.add(value);
}
// Attributes methods, indexed access -------------------------------------------------
/**
* Returns the number of attributes in the list.
*
* @return The number of attributes in the list.
*
* @see org.xml.sax.AttributeList#getLength
*/
@Override
public int getLength() {
return this.names.size();
}
/**
* This implementation always returns "".
*
* @param i The position of the attribute in the list.
* @return The attribute qualified name as a string;
* or null if there is no attribute at that position.
*
* @see org.xml.sax.Attributes#getQName(int)
*/
@Override
public String getQName(int i) {
if (i < 0) return null;
try {
// FIXME: not SAX2 compliant
return getLocalName(i);
} catch (ArrayIndexOutOfBoundsException e) {
return null;
}
}
/**
* Returns the name of an attribute (by position).
*
* @param i The position of the attribute in the list.
* @return The attribute name as a string;
* or null if there is no attribute at that position.
*
* @see org.xml.sax.Attributes#getQName(int)
*/
@Override
public String getLocalName(int i) {
if (i < 0) return null;
try {
return this.names.get(i);
} catch (ArrayIndexOutOfBoundsException e) {
return null;
}
}
/**
* Returns the type of an attribute (by position).
*
* @param i The position of the attribute in the list.
* @return The attribute type as "CDATA";
* or null if there is no attribute at that position.
*
* @see org.xml.sax.Attributes#getType(int)
*/
@Override
public String getType(int i) {
if (i < 0) return null;
try {
return CDATA;
} catch (ArrayIndexOutOfBoundsException e) {
return null;
}
}
/**
* Returns the value of an attribute (by position).
*
* @param i The position of the attribute in the list.
*
* @return The attribute value as a string;
* or null if there is no attribute at that position.
*
* @see org.xml.sax.Attributes#getValue(int)
*/
@Override
public String getValue(int i) {
if (i < 0) return null;
try {
return this.values.get(i);
} catch (ArrayIndexOutOfBoundsException e) {
return null;
}
}
/**
* Returns the namespace URI of an attribute (by position).
*
* @param i The position of the attribute in the list.
*
* @return The attribute namespace URI as a string;
* or null if there is no attribute at that position.
*
* @see org.xml.sax.Attributes#getValue(int)
*/
@Override
public String getURI(int i) {
if (i < 0) return null;
try {
return this.uris.get(i);
} catch (ArrayIndexOutOfBoundsException e) {
return null;
}
}
/**
* Returns null as qualified names are not available.
*
* @param qName The attribute name.
*
* @return null
*
* @see org.xml.sax.Attributes#getType(java.lang.String)
*/
@Override
public String getType(String qName) {
return null;
}
/**
* Returns null as qualified names are not available.
*
* @param name The attribute name.
*
* @see org.xml.sax.Attributes#getValue(java.lang.String)
*/
@Override
public String getValue(String name) {
return null;
}
/**
* Returns the type of an attribute (by name).
*
* @param uri The namespace URI of the attribute.
* @param name The attribute name.
* @return The attribute type as a string
* ("NMTOKEN" for an enumeration, and "CDATA" if no declaration was read).
* @see org.xml.sax.Attributes#getType(java.lang.String)
*/
@Override
public String getType(String uri, String name) {
return getType(getIndex(uri, name));
}
/**
* Returns the value of an attribute (by name).
*
* @param uri The namespace URI of the attribute.
* @param name The attribute name.
* @see org.xml.sax.AttributeList#getValue(java.lang.String)
*/
@Override
public String getValue(String uri, String name) {
return getValue(getIndex(uri, name));
}
/**
* Look up the index of an attribute by Namespace name.
*
* @param uri The Namespace URI, or the empty string if the name has no Namespace URI.
* @param localName The attribute's local name.
*
* @return The index of the attribute, or -1 if it does not appear in the list.
*/
@Override
public int getIndex(String uri, String localName) {
// try if only one attribute with that name
int index = this.names.indexOf(localName);
if (index == -1) return index;
if (this.uris.get(index).equals(uri)) return index;
// otherwise iterate
for (int i = 0; i < this.names.size(); i++) {
if (this.names.get(i).equals(localName) && this.uris.get(i).equals(uri)) return i;
}
return -1;
}
/**
* Look up the index of an attribute by Namespace name.
*
* @param qName The index of the given name.
*
* @return The index of the attribute, or -1 if it does not appear in the list.
*/
@Override
public int getIndex(String qName) {
// FIXME: not SAX2 compliant
return getIndex("", qName);
}
}
}