/*
* Copyright 2001-2004 The Apache Software Foundation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* $Id: SymbolTable.java,v 1.11 2004/02/16 22:25:10 minchau Exp $
*/
package com.sun.org.apache.xalan.internal.xsltc.compiler;
import java.util.Hashtable;
import java.util.StringTokenizer;
import java.util.Vector;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodType;
/**
* @author Jacek Ambroziak
* @author Santiago Pericas-Geertsen
* @author Morten Jorgensen
*/
final class SymbolTable {
// These hashtables are used for all stylesheets
private final Hashtable _stylesheets = new Hashtable();
private final Hashtable _primops = new Hashtable();
// These hashtables are used for some stylesheets
private Hashtable _variables = null;
private Hashtable _templates = null;
private Hashtable _attributeSets = null;
private Hashtable _aliases = null;
private Hashtable _excludedURI = null;
private Hashtable _decimalFormats = null;
public DecimalFormatting getDecimalFormatting(QName name) {
if (_decimalFormats == null) return null;
return((DecimalFormatting)_decimalFormats.get(name));
}
public void addDecimalFormatting(QName name, DecimalFormatting symbols) {
if (_decimalFormats == null) _decimalFormats = new Hashtable();
_decimalFormats.put(name, symbols);
}
public Stylesheet addStylesheet(QName name, Stylesheet node) {
return (Stylesheet)_stylesheets.put(name, node);
}
public Stylesheet lookupStylesheet(QName name) {
return (Stylesheet)_stylesheets.get(name);
}
public Template addTemplate(Template template) {
final QName name = template.getName();
if (_templates == null) _templates = new Hashtable();
return (Template)_templates.put(name, template);
}
public Template lookupTemplate(QName name) {
if (_templates == null) return null;
return (Template)_templates.get(name);
}
public Variable addVariable(Variable variable) {
if (_variables == null) _variables = new Hashtable();
final String name = variable.getName().getStringRep();
return (Variable)_variables.put(name, variable);
}
public Param addParam(Param parameter) {
if (_variables == null) _variables = new Hashtable();
final String name = parameter.getName().getStringRep();
return (Param)_variables.put(name, parameter);
}
public Variable lookupVariable(QName qname) {
if (_variables == null) return null;
final String name = qname.getStringRep();
final Object obj = _variables.get(name);
return obj instanceof Variable ? (Variable)obj : null;
}
public Param lookupParam(QName qname) {
if (_variables == null) return null;
final String name = qname.getStringRep();
final Object obj = _variables.get(name);
return obj instanceof Param ? (Param)obj : null;
}
public SyntaxTreeNode lookupName(QName qname) {
if (_variables == null) return null;
final String name = qname.getStringRep();
return (SyntaxTreeNode)_variables.get(name);
}
public AttributeSet addAttributeSet(AttributeSet atts) {
if (_attributeSets == null) _attributeSets = new Hashtable();
return (AttributeSet)_attributeSets.put(atts.getName(), atts);
}
public AttributeSet lookupAttributeSet(QName name) {
if (_attributeSets == null) return null;
return (AttributeSet)_attributeSets.get(name);
}
/**
* Add a primitive operator or function to the symbol table. To avoid
* name clashes with user-defined names, the prefix <tt>PrimopPrefix</tt>
* is prepended.
*/
public void addPrimop(String name, MethodType mtype) {
Vector methods = (Vector)_primops.get(name);
if (methods == null) {
_primops.put(name, methods = new Vector());
}
methods.addElement(mtype);
}
/**
* Lookup a primitive operator or function in the symbol table by
* prepending the prefix <tt>PrimopPrefix</tt>.
*/
public Vector lookupPrimop(String name) {
return (Vector)_primops.get(name);
}
/**
* This is used for xsl:attribute elements that have a "namespace"
* attribute that is currently not defined using xmlns:
*/
private int _nsCounter = 0;
public String generateNamespacePrefix() {
return(new String("ns"+(_nsCounter++)));
}
/**
* Use a namespace prefix to lookup a namespace URI
*/
private SyntaxTreeNode _current = null;
public void setCurrentNode(SyntaxTreeNode node) {
_current = node;
}
public String lookupNamespace(String prefix) {
if (_current == null) return(Constants.EMPTYSTRING);
return(_current.lookupNamespace(prefix));
}
/**
* Adds an alias for a namespace prefix
*/
public void addPrefixAlias(String prefix, String alias) {
if (_aliases == null) _aliases = new Hashtable();
_aliases.put(prefix,alias);
}
/**
* Retrieves any alias for a given namespace prefix
*/
public String lookupPrefixAlias(String prefix) {
if (_aliases == null) return null;
return (String)_aliases.get(prefix);
}
/**
* Register a namespace URI so that it will not be declared in the output
* unless it is actually referenced in the output.
*/
public void excludeURI(String uri) {
// The null-namespace cannot be excluded
if (uri == null) return;
// Create new hashtable of exlcuded URIs if none exists
if (_excludedURI == null) _excludedURI = new Hashtable();
// Register the namespace URI
Integer refcnt = (Integer)_excludedURI.get(uri);
if (refcnt == null)
refcnt = new Integer(1);
else
refcnt = new Integer(refcnt.intValue() + 1);
_excludedURI.put(uri,refcnt);
}
/**
* Exclude a series of namespaces given by a list of whitespace
* separated namespace prefixes.
*/
public void excludeNamespaces(String prefixes) {
if (prefixes != null) {
StringTokenizer tokens = new StringTokenizer(prefixes);
while (tokens.hasMoreTokens()) {
final String prefix = tokens.nextToken();
final String uri;
if (prefix.equals("#default"))
uri = lookupNamespace(Constants.EMPTYSTRING);
else
uri = lookupNamespace(prefix);
if (uri != null) excludeURI(uri);
}
}
}
/**
* Check if a namespace should not be declared in the output (unless used)
*/
public boolean isExcludedNamespace(String uri) {
if (uri != null && _excludedURI != null) {
final Integer refcnt = (Integer)_excludedURI.get(uri);
return (refcnt != null && refcnt.intValue() > 0);
}
return false;
}
/**
* Turn of namespace declaration exclusion
*/
public void unExcludeNamespaces(String prefixes) {
if (_excludedURI == null) return;
if (prefixes != null) {
StringTokenizer tokens = new StringTokenizer(prefixes);
while (tokens.hasMoreTokens()) {
final String prefix = tokens.nextToken();
final String uri;
if (prefix.equals("#default"))
uri = lookupNamespace(Constants.EMPTYSTRING);
else
uri = lookupNamespace(prefix);
Integer refcnt = (Integer)_excludedURI.get(uri);
if (refcnt != null)
_excludedURI.put(uri, new Integer(refcnt.intValue() - 1));
}
}
}
}
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