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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 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; } }




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