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/*
* Copyright (c) 1997, 2018 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Distribution License v. 1.0, which is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
package com.sun.xml.ws.util;
import java.util.ArrayList;
import java.util.EmptyStackException;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import com.sun.xml.ws.encoding.soap.streaming.SOAPNamespaceConstants;
/**
* Encapsulate Namespace logic for use by SAX drivers.
*
*
* This module, both source code and documentation, is in the
* Public Domain, and comes with NO WARRANTY.
*
*
* This class encapsulates the logic of Namespace processing:
* it tracks the declarations currently in force for each context
* and automatically processes qualified XML 1.0 names into their
* Namespace parts; it can also be used in reverse for generating
* XML 1.0 from Namespaces.
*
* Namespace support objects are reusable, but the reset method
* must be invoked between each session.
*
* Here is a simple session:
*
*
* String parts[] = new String[3];
* NamespaceSupport support = new NamespaceSupport();
*
* support.pushContext();
* support.declarePrefix("", "http://www.w3.org/1999/xhtml");
* support.declarePrefix("dc", "http://www.purl.org/dc#");
*
* String parts[] = support.processName("p", parts, false);
* System.out.println("Namespace URI: " + parts[0]);
* System.out.println("Local name: " + parts[1]);
* System.out.println("Raw name: " + parts[2]);
* String parts[] = support.processName("dc:title", parts, false);
* System.out.println("Namespace URI: " + parts[0]);
* System.out.println("Local name: " + parts[1]);
* System.out.println("Raw name: " + parts[2]);
* support.popContext();
*
*
* Note that this class is optimized for the use case where most
* elements do not contain Namespace declarations: if the same
* prefix/URI mapping is repeated for each context (for example), this
* class will be somewhat less efficient.
*
* @author David Megginson
* @author WS Development Team
*/
public final class NamespaceSupport {
/* added two new methods, slideContextUp() and slideContextDown()
* needed to implement the revised streaming parser class (Parser2)
*/
////////////////////////////////////////////////////////////////////
// Constants.
////////////////////////////////////////////////////////////////////
/**
* The XML Namespace as a constant.
*
* This is the Namespace URI that is automatically mapped
* to the "xml" prefix.
*/
public final static String XMLNS = "http://www.w3.org/XML/1998/namespace";
/**
* An empty enumeration.
*/
private final static Iterable EMPTY_ENUMERATION =
new ArrayList();
////////////////////////////////////////////////////////////////////
// Constructor.
////////////////////////////////////////////////////////////////////
/**
* Create a new Namespace support object.
*/
public NamespaceSupport() {
reset();
}
// PBG May 6 2002 added a copy constructor to support recording
public NamespaceSupport(NamespaceSupport that) {
contexts = new Context[that.contexts.length];
currentContext = null;
contextPos = that.contextPos;
Context currentParent = null;
for (int i = 0; i < that.contexts.length; i++) {
Context thatContext = that.contexts[i];
if (thatContext == null) {
contexts[i] = null;
continue;
}
Context thisContext = new Context(thatContext, currentParent);
contexts[i] = thisContext;
if (that.currentContext == thatContext) {
currentContext = thisContext;
}
currentParent = thisContext;
}
}
////////////////////////////////////////////////////////////////////
// Context management.
////////////////////////////////////////////////////////////////////
/**
* Reset this Namespace support object for reuse.
*
* It is necessary to invoke this method before reusing the
* Namespace support object for a new session.
*/
public void reset() {
contexts = new Context[32];
contextPos = 0;
contexts[contextPos] = currentContext = new Context();
currentContext.declarePrefix("xml", XMLNS);
}
/**
* Start a new Namespace context.
*
* Normally, you should push a new context at the beginning
* of each XML element: the new context will automatically inherit
* the declarations of its parent context, but it will also keep
* track of which declarations were made within this context.
*
* The Namespace support object always starts with a base context
* already in force: in this context, only the "xml" prefix is
* declared.
*
* @see #popContext
*/
public void pushContext() {
int max = contexts.length;
contextPos++;
// Extend the array if necessary
if (contextPos >= max) {
Context newContexts[] = new Context[max * 2];
System.arraycopy(contexts, 0, newContexts, 0, max);
contexts = newContexts;
}
// Allocate the context if necessary.
currentContext = contexts[contextPos];
if (currentContext == null) {
contexts[contextPos] = currentContext = new Context();
}
// Set the parent, if any.
if (contextPos > 0) {
currentContext.setParent(contexts[contextPos - 1]);
}
}
/**
* Revert to the previous Namespace context.
*
* Normally, you should pop the context at the end of each
* XML element. After popping the context, all Namespace prefix
* mappings that were previously in force are restored.
*
* You must not attempt to declare additional Namespace
* prefixes after popping a context, unless you push another
* context first.
*
* @see #pushContext
*/
public void popContext() {
contextPos--;
if (contextPos < 0) {
throw new EmptyStackException();
}
currentContext = contexts[contextPos];
}
/*
* added for the revised streaming parser class (Parser2)
* Move the context artificially up one level (i.e. contracting it).
*/
public void slideContextUp() {
contextPos--;
currentContext = contexts[contextPos];
}
/*
* added for the revised streaming parser class (Parser2)
* Move the context artificially down one level (i.e. expanding it).
*/
public void slideContextDown() {
contextPos++;
if (contexts[contextPos] == null) {
// trying to slide to a context that was never created
contexts[contextPos] = contexts[contextPos - 1];
}
currentContext = contexts[contextPos];
}
////////////////////////////////////////////////////////////////////
// Operations within a context.
////////////////////////////////////////////////////////////////////
/**
* Declare a Namespace prefix.
*
* This method declares a prefix in the current Namespace
* context; the prefix will remain in force until this context
* is popped, unless it is shadowed in a descendant context.
*
* To declare a default Namespace, use the empty string. The
* prefix must not be "xml" or "xmlns".
*
* Note that you must not declare a prefix after
* you've pushed and popped another Namespace.
*
* Note that there is an asymmetry in this library: while {@link
* #getPrefix getPrefix} will not return the default "" prefix,
* even if you have declared one; to check for a default prefix,
* you have to look it up explicitly using {@link #getURI getURI}.
* This asymmetry exists to make it easier to look up prefixes
* for attribute names, where the default prefix is not allowed.
*
* @param prefix The prefix to declare, or null for the empty
* string.
* @param uri The Namespace URI to associate with the prefix.
* @return true if the prefix was legal, false otherwise
* @see #processName
* @see #getURI
* @see #getPrefix
*/
public boolean declarePrefix(String prefix, String uri) {
// bugfix#: 4989753
if ((prefix.equals("xml") && !uri.equals(SOAPNamespaceConstants.XMLNS))
|| prefix.equals("xmlns")) {
return false;
} else {
currentContext.declarePrefix(prefix, uri);
return true;
}
}
/**
* Process a raw XML 1.0 name.
*
* This method processes a raw XML 1.0 name in the current
* context by removing the prefix and looking it up among the
* prefixes currently declared. The return value will be the
* array supplied by the caller, filled in as follows:
*
*
* - parts[0]
* - The Namespace URI, or an empty string if none is
* in use.
* - parts[1]
* - The local name (without prefix).
* - parts[2]
* - The original raw name.
*
*
* All of the strings in the array will be internalized. If
* the raw name has a prefix that has not been declared, then
* the return value will be null.
*
* Note that attribute names are processed differently than
* element names: an unprefixed element name will received the
* default Namespace (if any), while an unprefixed element name
* will not.
*
* @param qName The raw XML 1.0 name to be processed.
* @param parts An array supplied by the caller, capable of
* holding at least three members.
* @param isAttribute A flag indicating whether this is an
* attribute name (true) or an element name (false).
* @return The supplied array holding three internalized strings
* representing the Namespace URI (or empty string), the
* local name, and the raw XML 1.0 name; or null if there
* is an undeclared prefix.
* @see #declarePrefix
* @see java.lang.String#intern */
public String[] processName(
String qName,
String parts[],
boolean isAttribute) {
String myParts[] = currentContext.processName(qName, isAttribute);
if (myParts == null) {
return null;
} else {
parts[0] = myParts[0];
parts[1] = myParts[1];
parts[2] = myParts[2];
return parts;
}
}
/**
* Look up a prefix and get the currently-mapped Namespace URI.
*
* This method looks up the prefix in the current context.
* Use the empty string ("") for the default Namespace.
*
* @param prefix The prefix to look up.
* @return The associated Namespace URI, or null if the prefix
* is undeclared in this context.
* @see #getPrefix
* @see #getPrefixes
*/
public String getURI(String prefix) {
return currentContext.getURI(prefix);
}
/**
* Return an enumeration of all prefixes currently declared.
*
* Note: if there is a default prefix, it will not be
* returned in this enumeration; check for the default prefix
* using the {@link #getURI getURI} with an argument of "".
*
* @return An enumeration of all prefixes declared in the
* current context except for the empty (default)
* prefix.
* @see #getDeclaredPrefixes
* @see #getURI
*/
public Iterable getPrefixes() {
return currentContext.getPrefixes();
}
/**
* Return one of the prefixes mapped to a Namespace URI.
*
* If more than one prefix is currently mapped to the same
* URI, this method will make an arbitrary selection; if you
* want all of the prefixes, use the {@link #getPrefixes}
* method instead.
*
* Note: this will never return the empty (default) prefix;
* to check for a default prefix, use the {@link #getURI getURI}
* method with an argument of "".
*
* @param uri The Namespace URI.
* @return One of the prefixes currently mapped to the URI supplied,
* or null if none is mapped or if the URI is assigned to
* the default Namespace.
* @see #getPrefixes(java.lang.String)
* @see #getURI
*/
public String getPrefix(String uri) {
return currentContext.getPrefix(uri);
}
/**
* Return an enumeration of all prefixes currently declared for a URI.
*
* This method returns prefixes mapped to a specific Namespace
* URI. The xml: prefix will be included. If you want only one
* prefix that's mapped to the Namespace URI, and you don't care
* which one you get, use the {@link #getPrefix getPrefix}
* method instead.
*
* Note: the empty (default) prefix is never included
* in this enumeration; to check for the presence of a default
* Namespace, use the {@link #getURI getURI} method with an
* argument of "".
*
* @param uri The Namespace URI.
* @return An enumeration of all prefixes declared in the
* current context.
* @see #getPrefix
* @see #getDeclaredPrefixes
* @see #getURI
*/
public Iterator getPrefixes(String uri) {
List prefixes = new ArrayList();
for (String prefix: getPrefixes()) {
if (uri.equals(getURI(prefix))) {
prefixes.add(prefix);
}
}
return prefixes.iterator();
}
/**
* Return an enumeration of all prefixes declared in this context.
*
* The empty (default) prefix will be included in this
* enumeration; note that this behaviour differs from that of
* {@link #getPrefix} and {@link #getPrefixes}.
*
* @return An enumeration of all prefixes declared in this
* context.
* @see #getPrefixes
* @see #getURI
*/
public Iterable getDeclaredPrefixes() {
return currentContext.getDeclaredPrefixes();
}
////////////////////////////////////////////////////////////////////
// Internal state.
////////////////////////////////////////////////////////////////////
private Context contexts[];
private Context currentContext;
private int contextPos;
////////////////////////////////////////////////////////////////////
// Internal classes.
////////////////////////////////////////////////////////////////////
/**
* Internal class for a single Namespace context.
*
* This module caches and reuses Namespace contexts, so the number
* allocated will be equal to the element depth of the document, not to the
* total number of elements (i.e. 5-10 rather than tens of thousands).
*/
final static class Context {
/**
* Create the root-level Namespace context.
*/
Context() {
copyTables();
}
// PGB May 6 2002 added copy constructor
Context(Context that, Context newParent) {
if (that == null) {
copyTables();
return;
}
if (newParent != null && !that.tablesDirty) {
prefixTable =
that.prefixTable == that.parent.prefixTable
? newParent.prefixTable
: (HashMap) that.prefixTable.clone();
uriTable =
that.uriTable == that.parent.uriTable
? newParent.uriTable
: (HashMap) that.uriTable.clone();
elementNameTable =
that.elementNameTable == that.parent.elementNameTable
? newParent.elementNameTable
: (HashMap) that.elementNameTable.clone();
attributeNameTable =
that.attributeNameTable == that.parent.attributeNameTable
? newParent.attributeNameTable
: (HashMap) that.attributeNameTable.clone();
defaultNS =
that.defaultNS == that.parent.defaultNS
? newParent.defaultNS
: that.defaultNS;
} else {
prefixTable = (HashMap) that.prefixTable.clone();
uriTable = (HashMap) that.uriTable.clone();
elementNameTable = (HashMap) that.elementNameTable.clone();
attributeNameTable = (HashMap) that.attributeNameTable.clone();
defaultNS = that.defaultNS;
}
tablesDirty = that.tablesDirty;
parent = newParent;
declarations =
that.declarations == null
? null
: (ArrayList) that.declarations.clone();
}
/**
* (Re)set the parent of this Namespace context.
*
* @param parent The parent Namespace context object.
*/
void setParent(Context parent) {
this.parent = parent;
declarations = null;
prefixTable = parent.prefixTable;
uriTable = parent.uriTable;
elementNameTable = parent.elementNameTable;
attributeNameTable = parent.attributeNameTable;
defaultNS = parent.defaultNS;
tablesDirty = false;
}
/**
* Declare a Namespace prefix for this context.
*
* @param prefix The prefix to declare.
* @param uri The associated Namespace URI.
* @see org.xml.sax.helpers.NamespaceSupport#declarePrefix
*/
void declarePrefix(String prefix, String uri) {
// Lazy processing...
if (!tablesDirty) {
copyTables();
}
if (declarations == null) {
declarations = new ArrayList();
}
prefix = prefix.intern();
uri = uri.intern();
if ("".equals(prefix)) {
if ("".equals(uri)) {
defaultNS = null;
} else {
defaultNS = uri;
}
} else {
prefixTable.put(prefix, uri);
uriTable.put(uri, prefix); // may wipe out another prefix
}
declarations.add(prefix);
}
/**
* Process a raw XML 1.0 name in this context.
*
* @param qName The raw XML 1.0 name.
* @param isAttribute true if this is an attribute name.
* @return An array of three strings containing the
* URI part (or empty string), the local part,
* and the raw name, all internalized, or null
* if there is an undeclared prefix.
* @see org.xml.sax.helpers.NamespaceSupport#processName
*/
String[] processName(String qName, boolean isAttribute) {
String name[];
Map table;
// Select the appropriate table.
if (isAttribute) {
table = elementNameTable;
} else {
table = attributeNameTable;
}
// Start by looking in the cache, and
// return immediately if the name
// is already known in this content
name = (String[]) table.get(qName);
if (name != null) {
return name;
}
// We haven't seen this name in this
// context before.
name = new String[3];
int index = qName.indexOf(':');
// No prefix.
if (index == -1) {
if (isAttribute || defaultNS == null) {
name[0] = "";
} else {
name[0] = defaultNS;
}
name[1] = qName.intern();
name[2] = name[1];
}
// Prefix
else {
String prefix = qName.substring(0, index);
String local = qName.substring(index + 1);
String uri;
if ("".equals(prefix)) {
uri = defaultNS;
} else {
uri = (String) prefixTable.get(prefix);
}
if (uri == null) {
return null;
}
name[0] = uri;
name[1] = local.intern();
name[2] = qName.intern();
}
// Save in the cache for future use.
table.put(name[2], name);
tablesDirty = true;
return name;
}
/**
* Look up the URI associated with a prefix in this context.
*
* @param prefix The prefix to look up.
* @return The associated Namespace URI, or null if none is
* declared.
* @see org.xml.sax.helpers.NamespaceSupport#getURI
*/
String getURI(String prefix) {
if ("".equals(prefix)) {
return defaultNS;
} else if (prefixTable == null) {
return null;
} else {
return (String) prefixTable.get(prefix);
}
}
/**
* Look up one of the prefixes associated with a URI in this context.
*
* Since many prefixes may be mapped to the same URI,
* the return value may be unreliable.
*
* @param uri The URI to look up.
* @return The associated prefix, or null if none is declared.
* @see org.xml.sax.helpers.NamespaceSupport#getPrefix
*/
String getPrefix(String uri) {
if (uriTable == null) {
return null;
} else {
return (String) uriTable.get(uri);
}
}
/**
* Return an enumeration of prefixes declared in this context.
*
* @return An enumeration of prefixes (possibly empty).
* @see org.xml.sax.helpers.NamespaceSupport#getDeclaredPrefixes
*/
Iterable getDeclaredPrefixes() {
if (declarations == null) {
return EMPTY_ENUMERATION;
} else {
return declarations;
}
}
/**
* Return an enumeration of all prefixes currently in force.
*
* The default prefix, if in force, is not
* returned, and will have to be checked for separately.
*
* @return An enumeration of prefixes (never empty).
* @see org.xml.sax.helpers.NamespaceSupport#getPrefixes
*/
Iterable getPrefixes() {
if (prefixTable == null) {
return EMPTY_ENUMERATION;
} else {
return prefixTable.keySet();
}
}
////////////////////////////////////////////////////////////////
// Internal methods.
////////////////////////////////////////////////////////////////
/**
* Copy on write for the internal tables in this context.
*
* This class is optimized for the normal case where most
* elements do not contain Namespace declarations.
*/
private void copyTables() {
if (prefixTable != null) {
prefixTable = (HashMap) prefixTable.clone();
} else {
prefixTable = new HashMap();
}
if (uriTable != null) {
uriTable = (HashMap) uriTable.clone();
} else {
uriTable = new HashMap();
}
elementNameTable = new HashMap();
attributeNameTable = new HashMap();
tablesDirty = true;
}
////////////////////////////////////////////////////////////////
// Protected state.
////////////////////////////////////////////////////////////////
HashMap prefixTable;
HashMap uriTable;
// PBG May 6 2002 changed these two from Map to HashMap
HashMap elementNameTable;
HashMap attributeNameTable;
String defaultNS = null;
////////////////////////////////////////////////////////////////
// Internal state.
////////////////////////////////////////////////////////////////
// PBG May 6 2002 changed this from List to ArrayList
private ArrayList declarations = null;
private boolean tablesDirty = false;
private Context parent = null;
}
}