/*
* Copyright 2000-2002,2004,2005 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.
*/
package org.apache.xerces.impl.xs;
import org.apache.xerces.impl.xs.opti.ElementImpl;
import org.apache.xerces.util.NamespaceSupport;
import org.apache.xerces.util.SymbolTable;
import org.apache.xerces.util.XMLSymbols;
import org.apache.xerces.xni.NamespaceContext;
import org.apache.xerces.xni.QName;
import org.w3c.dom.Attr;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
/**
* This class customizes the behaviour of the util.NamespaceSupport
* class in order to easily implement some features that we need for
* efficient schema handling. It will not be generally useful.
*
* @xerces.internal
*
* @author Neil Graham, IBM
*
* @version $Id: SchemaNamespaceSupport.java 320573 2005-09-08 01:48:39Z mrglavas $
*/
public class SchemaNamespaceSupport
extends NamespaceSupport {
private SchemaRootContext fSchemaRootContext = null;
public SchemaNamespaceSupport (Element schemaRoot, SymbolTable symbolTable) {
super();
if (schemaRoot != null && !(schemaRoot instanceof ElementImpl)) {
Document ownerDocument = schemaRoot.getOwnerDocument();
if (ownerDocument != null && schemaRoot != ownerDocument.getDocumentElement()) {
fSchemaRootContext = new SchemaRootContext(schemaRoot, symbolTable);
}
}
} // constructor
// more effecient than NamespaceSupport(NamespaceContext)
public SchemaNamespaceSupport(SchemaNamespaceSupport nSupport) {
fSchemaRootContext = nSupport.fSchemaRootContext;
fNamespaceSize = nSupport.fNamespaceSize;
if (fNamespace.length < fNamespaceSize)
fNamespace = new String[fNamespaceSize];
System.arraycopy(nSupport.fNamespace, 0, fNamespace, 0, fNamespaceSize);
fCurrentContext = nSupport.fCurrentContext;
if (fContext.length <= fCurrentContext)
fContext = new int[fCurrentContext+1];
System.arraycopy(nSupport.fContext, 0, fContext, 0, fCurrentContext+1);
} // end constructor
/**
* This method takes a set of Strings, as stored in a
* NamespaceSupport object, and "fools" the object into thinking
* that this is one unified context. This is meant to be used in
* conjunction with things like local elements, whose declarations
* may be deeply nested but which for all practical purposes may
* be regarded as being one level below the global <schema>
* element--at least with regard to namespace declarations.
* It's worth noting that the context from which the strings are
* being imported had better be using the same SymbolTable.
*/
public void setEffectiveContext (String [] namespaceDecls) {
if(namespaceDecls == null || namespaceDecls.length == 0) return;
pushContext();
int newSize = fNamespaceSize + namespaceDecls.length;
if (fNamespace.length < newSize) {
// expand namespace's size...
String[] tempNSArray = new String[newSize];
System.arraycopy(fNamespace, 0, tempNSArray, 0, fNamespace.length);
fNamespace = tempNSArray;
}
System.arraycopy(namespaceDecls, 0, fNamespace, fNamespaceSize,
namespaceDecls.length);
fNamespaceSize = newSize;
} // setEffectiveContext(String):void
/**
* This method returns an array of Strings, as would be stored in
* a NamespaceSupport object. This array contains all
* declarations except those at the global level.
*/
public String [] getEffectiveLocalContext() {
// the trick here is to recognize that all local contexts
// happen to start at fContext[3].
// context 1: empty
// context 2: decls for xml and xmlns;
// context 3: decls on <xs:schema>: the global ones
String[] returnVal = null;
if (fCurrentContext >= 3) {
int bottomLocalContext = fContext[3];
int copyCount = fNamespaceSize - bottomLocalContext;
if (copyCount > 0) {
returnVal = new String[copyCount];
System.arraycopy(fNamespace, bottomLocalContext, returnVal, 0,
copyCount);
}
}
return returnVal;
} // getEffectiveLocalContext():String
// This method removes from this object all the namespaces
// returned by getEffectiveLocalContext.
public void makeGlobal() {
if (fCurrentContext >= 3) {
fCurrentContext = 3;
fNamespaceSize = fContext[3];
}
} // makeGlobal
public String getURI(String prefix) {
String uri = super.getURI(prefix);
if (uri == null && fSchemaRootContext != null) {
if (!fSchemaRootContext.fDOMContextBuilt) {
fSchemaRootContext.fillNamespaceContext();
fSchemaRootContext.fDOMContextBuilt = true;
}
if (fSchemaRootContext.fNamespaceSize > 0 &&
!containsPrefix(prefix)) {
uri = fSchemaRootContext.getURI(prefix);
}
}
return uri;
}
/**
* This class keeps track of the namespace bindings
* declared on ancestors of the schema root.
*/
static final class SchemaRootContext {
//
// Data
//
/**
* Namespace binding information. This array is composed of a
* series of tuples containing the namespace binding information:
* <prefix, uri>.
*/
String[] fNamespace = new String[16 * 2];
/** The size of the namespace information array. */
int fNamespaceSize = 0;
/**
* Flag indicating whether the namespace context
* has been from the root node's ancestors.
*/
boolean fDOMContextBuilt = false;
/** Schema root. **/
private final Element fSchemaRoot;
/** Symbol table. **/
private final SymbolTable fSymbolTable;
/** Temporary storage for attribute QNames. **/
private final QName fAttributeQName = new QName();
SchemaRootContext(Element schemaRoot, SymbolTable symbolTable) {
fSchemaRoot = schemaRoot;
fSymbolTable = symbolTable;
}
void fillNamespaceContext() {
if (fSchemaRoot != null) {
Node currentNode = fSchemaRoot.getParentNode();
while (currentNode != null) {
if (Node.ELEMENT_NODE == currentNode.getNodeType()) {
NamedNodeMap attributes = currentNode.getAttributes();
final int attrCount = attributes.getLength();
for (int i = 0; i < attrCount; ++i) {
Attr attr = (Attr) attributes.item(i);
String value = attr.getValue();
if (value == null) {
value = XMLSymbols.EMPTY_STRING;
}
fillQName(fAttributeQName, attr);
// REVISIT: Should we be looking at non-namespace attributes
// for additional mappings? Should we detect illegal namespace
// declarations and exclude them from the context? -- mrglavas
if (fAttributeQName.uri == NamespaceContext.XMLNS_URI) {
// process namespace attribute
if (fAttributeQName.prefix == XMLSymbols.PREFIX_XMLNS) {
declarePrefix(fAttributeQName.localpart, value.length() != 0 ? fSymbolTable.addSymbol(value) : null);
}
else {
declarePrefix(XMLSymbols.EMPTY_STRING, value.length() != 0 ? fSymbolTable.addSymbol(value) : null);
}
}
}
}
currentNode = currentNode.getParentNode();
}
}
}
String getURI(String prefix) {
// find prefix in the DOM context
for (int i = 0; i < fNamespaceSize; i += 2) {
if (fNamespace[i] == prefix) {
return fNamespace[i + 1];
}
}
// prefix not found
return null;
}
private void declarePrefix(String prefix, String uri) {
// resize array, if needed
if (fNamespaceSize == fNamespace.length) {
String[] namespacearray = new String[fNamespaceSize * 2];
System.arraycopy(fNamespace, 0, namespacearray, 0, fNamespaceSize);
fNamespace = namespacearray;
}
// bind prefix to uri in current context
fNamespace[fNamespaceSize++] = prefix;
fNamespace[fNamespaceSize++] = uri;
}
private void fillQName(QName toFill, Node node) {
final String prefix = node.getPrefix();
final String localName = node.getLocalName();
final String rawName = node.getNodeName();
final String namespace = node.getNamespaceURI();
toFill.prefix = (prefix != null) ? fSymbolTable.addSymbol(prefix) : XMLSymbols.EMPTY_STRING;
toFill.localpart = (localName != null) ? fSymbolTable.addSymbol(localName) : XMLSymbols.EMPTY_STRING;
toFill.rawname = (rawName != null) ? fSymbolTable.addSymbol(rawName) : XMLSymbols.EMPTY_STRING;
toFill.uri = (namespace != null && namespace.length() > 0) ? fSymbolTable.addSymbol(namespace) : null;
}
}
} // class NamespaceSupport