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package com.ctc.wstx.sr;
import java.util.*;
import javax.xml.XMLConstants;
import javax.xml.namespace.NamespaceContext;
import javax.xml.namespace.QName;
import javax.xml.stream.Location;
import javax.xml.stream.XMLStreamException;
import org.codehaus.stax2.validation.XMLValidator;
import com.ctc.wstx.api.ReaderConfig;
import com.ctc.wstx.cfg.ErrorConsts;
import com.ctc.wstx.util.BaseNsContext;
import com.ctc.wstx.util.EmptyIterator;
import com.ctc.wstx.util.EmptyNamespaceContext;
import com.ctc.wstx.util.SingletonIterator;
import com.ctc.wstx.util.StringVector;
import com.ctc.wstx.util.TextBuilder;
/**
* Sub-class of {@link InputElementStack} used when operating in
* non-namespace-aware, non validating mode.
*/
public final class NonNsInputElementStack
extends InputElementStack
{
final static String INT_ERR_UNEXPECTED_CALL = "Internal error: method should never be called for non-namespace element stack.";
/*
//////////////////////////////////////////////////
// Configuration
//////////////////////////////////////////////////
*/
protected final NonNsAttributeCollector mAttrCollector;
/*
//////////////////////////////////////////////////
// Element stack state information
//////////////////////////////////////////////////
*/
/**
* Array that contains path of open elements from root, one String
* for each open start element.
*/
protected String[] mElements;
/**
* Number of Strings in {@link #mElements} that are valid.
*/
protected int mSize;
/*
//////////////////////////////////////////////////
// Simple 1-slot QName cache; used for improving
// efficiency of code that uses QNames extensively
// (like StAX Event API implementation)
//////////////////////////////////////////////////
*/
protected String mLastLocalName = null;
protected QName mLastName = null;
/*
//////////////////////////////////////////////////
// Life-cycle (create, update state)
//////////////////////////////////////////////////
*/
public NonNsInputElementStack(int initialSize, ReaderConfig cfg)
{
super(cfg);
mSize = 0;
if (initialSize < 4) {
initialSize = 4;
}
mElements = new String[initialSize];
mAttrCollector = new NonNsAttributeCollector(cfg);
}
protected void setAutomaticDTDValidator(XMLValidator validator, NsDefaultProvider nsDefs)
{
addValidator(validator);
}
public final void push(String prefix, String localName)
{
throw new Error(INT_ERR_UNEXPECTED_CALL);
}
public final void push(String fullName)
{
if (mSize == mElements.length) {
String[] old = mElements;
mElements = new String[old.length + 32];
System.arraycopy(old, 0, mElements, 0, old.length);
}
mElements[mSize] = fullName;
++mSize;
mAttrCollector.reset();
}
/**
* @return Validation state that should be effective for the parent
* element state
*/
public int pop()
throws XMLStreamException
{
if (mSize == 0) {
throw new IllegalStateException("Popping from empty stack.");
}
if (mValidator == null) {
/* Let's allow GCing (not likely to matter, as Strings are very
* likely interned... but it's a good habit
*/
mElements[--mSize] = null;
return XMLValidator.CONTENT_ALLOW_ANY_TEXT;
}
/* Note: can and should not shrink the stack before calling
* validator (since it can do a callback to access the info --
* not just the current element, but possibly other related data
* like stack depth)
*/
int size = mSize-1;
int result = mValidator.validateElementEnd(mElements[size], null, null);
mSize = size;
mElements[size] = null;
return result;
}
/**
* Method called to update information about top of the stack, with
* attribute information passed in. Will resolve namespace references,
* and update namespace stack with information.
*
* @return Validation state that should be effective for the fully
* resolved element context
*/
public int resolveAndValidateElement()
throws XMLStreamException
{
NonNsAttributeCollector ac = mAttrCollector;
/* Attribute collector can now build its accessor data structs
* as necessary
*/
int xmlidIx = ac.resolveValues(mReporter);
mIdAttrIndex = xmlidIx;
// Any validator(s)? If not, we are done (except for xml:id check)
if (mValidator == null) {
if (xmlidIx >= 0) { // need to normalize xml:id, still?
normalizeXmlIdAttr(ac, xmlidIx);
}
return XMLValidator.CONTENT_ALLOW_ANY_TEXT;
}
// Otherwise need to call validator's methods:
/* First, a call to check if the element itself may be acceptable
* within structure:
*/
mValidator.validateElementStart(mElements[mSize-1], null,null);
// Then attributes, if any:
int attrLen = ac.getCount();
if (attrLen > 0) {
StringVector attrNames = ac.getNameList();
String[] nameData = attrNames.getInternalArray();
TextBuilder attrBuilder = ac.getAttrBuilder();
char[] attrCB = attrBuilder.getCharBuffer();
for (int i = 0; i < attrLen; ++i) {
String normValue = mValidator.validateAttribute
(nameData[i], null, null, attrCB,
attrBuilder.getOffset(i),
attrBuilder.getOffset(i+1));
if (normValue != null) {
ac.setNormalizedValue(i, normValue);
}
}
}
/* And finally let's wrap things up to see what textual content
* is allowed as child content, if any:
*/
return mValidator.validateElementAndAttributes();
}
/*
///////////////////////////////////////////////////
// Public methods
///////////////////////////////////////////////////
*/
public final boolean isNamespaceAware() {
return false;
}
public final int getDepth() { return mSize; }
public final AttributeCollector getAttrCollector() {
return mAttrCollector;
}
/**
* Method called to construct a non-transient NamespaceContext instance;
* generally needed when creating events to return from event-based
* iterators.
*/
public final BaseNsContext createNonTransientNsContext(Location loc) {
return EmptyNamespaceContext.getInstance();
}
/*
///////////////////////////////////////////////////
// Implementation of NamespaceContext:
///////////////////////////////////////////////////
*/
public final String getNamespaceURI(String prefix) {
return null;
}
public final String getPrefix(String nsURI) {
return null;
}
public final Iterator getPrefixes(String nsURI) {
return EmptyIterator.getInstance();
}
/*
///////////////////////////////////////////////////
// AttributeInfo methods (StAX2)
///////////////////////////////////////////////////
*/
public final int getAttributeCount()
{
return mAttrCollector.getCount();
}
public final int findAttributeIndex(String nsURI, String localName)
{
// Should never pass a NS URI...
if (nsURI != null && nsURI.length() > 0) {
return -1;
}
return mAttrCollector.findIndex(localName);
}
/*
///////////////////////////////////////////////////
// ValidationContext methods
///////////////////////////////////////////////////
*/
public final QName getCurrentElementName()
{
if (mSize == 0) {
return null;
}
/* 03-Dec-2004, TSa: Maybe we can just reuse the last QName
* object created, if we have same data? (happens if
* state hasn't changed, or we got end element for a leaf
* element, or repeating leaf elements)
*/
String ln = mElements[mSize-1];
/* Since local names are always interned, can just use cheap
* identity comparison here:
*/
if (ln == mLastLocalName) {
return mLastName;
}
QName n = new QName(ln);
mLastLocalName = ln;
mLastName = n;
return n;
}
public int addDefaultAttribute(String localName, String uri, String prefix,
String value)
{
// No real namespace info passed...
return mAttrCollector.addDefaultAttribute(localName, value);
}
/*
///////////////////////////////////////////////////
// Support for NsDefaultProvider
///////////////////////////////////////////////////
*/
public boolean isPrefixLocallyDeclared(String internedPrefix) {
// should never be called... but let's not care if it is
return false;
}
public void addNsBinding(String prefix, String uri) {
// should never be called... but let's just ignore it.
}
/*
///////////////////////////////////////////////////
// Accessors:
///////////////////////////////////////////////////
*/
// // // Generic stack information:
public final boolean isEmpty() {
return mSize == 0;
}
// // // Information about element at top of stack:
public final String getDefaultNsURI() {
return null;
}
public final String getNsURI() {
return null;
}
public final String getPrefix() {
return null;
}
public final String getLocalName() {
if (mSize == 0) {
throw new IllegalStateException("Illegal access, empty stack.");
}
return mElements[mSize-1];
}
public final boolean matches(String prefix, String localName)
{
if (mSize == 0) {
throw new IllegalStateException("Illegal access, empty stack.");
}
if (prefix != null && prefix.length() > 0) {
return false;
}
String thisName = mElements[mSize-1];
return (thisName == localName) || thisName.equals(localName);
}
public final String getTopElementDesc() {
if (mSize == 0) {
throw new IllegalStateException("Illegal access, empty stack.");
}
return mElements[mSize-1];
}
// // // Namespace information:
public final int getTotalNsCount() {
return 0;
}
/**
* @return Number of active prefix/namespace mappings for current scope,
* NOT including mappings from enclosing elements.
*/
public final int getCurrentNsCount() {
return 0;
}
public final String getLocalNsPrefix(int index) {
throwIllegalIndex(index);
return null;
}
public final String getLocalNsURI(int index) {
throwIllegalIndex(index);
return null;
}
private static void throwIllegalIndex(int index) {
throw new IllegalArgumentException("Illegal namespace index "+index
+"; current scope has no namespace declarations.");
}
}
