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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 java.util.Enumeration;
import java.util.Hashtable;
import java.util.Vector;
/**
* A class used to hold the internal schema grammar set for the current instance
*
* @xerces.internal
*
* @author Sandy Gao, IBM
* @version $Id: XSGrammarBucket.java 1031717 2010-11-05 19:04:41Z sandygao $
*/
public class XSGrammarBucket {
// Data
/**
* Hashtable that maps between Namespace and a Grammar
*/
Hashtable fGrammarRegistry = new Hashtable();
SchemaGrammar fNoNSGrammar = null;
/**
* Get the schema grammar for the specified namespace
*
* @param namespace
* @return SchemaGrammar associated with the namespace
*/
public SchemaGrammar getGrammar(String namespace) {
if (namespace == null)
return fNoNSGrammar;
return (SchemaGrammar)fGrammarRegistry.get(namespace);
}
/**
* Put a schema grammar into the registry
* This method is for internal use only: it assumes that a grammar with
* the same target namespace is not already in the bucket.
*
* @param grammar the grammar to put in the registry
*/
public void putGrammar(SchemaGrammar grammar) {
if (grammar.getTargetNamespace() == null)
fNoNSGrammar = grammar;
else
fGrammarRegistry.put(grammar.getTargetNamespace(), grammar);
}
/**
* put a schema grammar and any grammars imported by it (directly or
* inderectly) into the registry. when a grammar with the same target
* namespace is already in the bucket, and different from the one being
* added, it's an error, and no grammar will be added into the bucket.
*
* @param grammar the grammar to put in the registry
* @param deep whether to add imported grammars
* @return whether the process succeeded
*/
public boolean putGrammar(SchemaGrammar grammar, boolean deep) {
// whether there is one with the same tns
SchemaGrammar sg = getGrammar(grammar.fTargetNamespace);
if (sg != null) {
// if the one we have is different from the one passed, it's an error
return sg == grammar;
}
// not deep import, then just add this one grammar
if (!deep) {
putGrammar(grammar);
return true;
}
// get all imported grammars, and make a copy of the Vector, so that
// we can recursively process the grammars, and add distinct ones
// to the same vector
Vector currGrammars = (Vector)grammar.getImportedGrammars();
if (currGrammars == null) {
putGrammar(grammar);
return true;
}
Vector grammars = ((Vector)currGrammars.clone());
SchemaGrammar sg1, sg2;
Vector gs;
// for all (recursively) imported grammars
for (int i = 0; i < grammars.size(); i++) {
// get the grammar
sg1 = (SchemaGrammar)grammars.elementAt(i);
// check whether the bucket has one with the same tns
sg2 = getGrammar(sg1.fTargetNamespace);
if (sg2 == null) {
// we need to add grammars imported by sg1 too
gs = sg1.getImportedGrammars();
// for all grammars imported by sg2, but not in the vector
// we add them to the vector
if(gs == null) continue;
for (int j = gs.size() - 1; j >= 0; j--) {
sg2 = (SchemaGrammar)gs.elementAt(j);
if (!grammars.contains(sg2))
grammars.addElement(sg2);
}
}
// we found one with the same target namespace
// if the two grammars are not the same object, then it's an error
else if (sg2 != sg1) {
return false;
}
}
// now we have all imported grammars stored in the vector. add them
putGrammar(grammar);
for (int i = grammars.size() - 1; i >= 0; i--)
putGrammar((SchemaGrammar)grammars.elementAt(i));
return true;
}
/**
* put a schema grammar and any grammars imported by it (directly or
* inderectly) into the registry. when a grammar with the same target
* namespace is already in the bucket, and different from the one being
* added, no grammar will be added into the bucket.
*
* @param grammar the grammar to put in the registry
* @param deep whether to add imported grammars
* @param ignoreConflict whether to ignore grammars that already exist in the grammar
* bucket or not - including 'grammar' parameter.
* @return whether the process succeeded
*/
public boolean putGrammar(SchemaGrammar grammar, boolean deep, boolean ignoreConflict) {
if (!ignoreConflict) {
return putGrammar(grammar, deep);
}
// if grammar already exist in the bucket, we ignore the request
SchemaGrammar sg = getGrammar(grammar.fTargetNamespace);
if (sg == null) {
putGrammar(grammar);
}
// not adding the imported grammars
if (!deep) {
return true;
}
// get all imported grammars, and make a copy of the Vector, so that
// we can recursively process the grammars, and add distinct ones
// to the same vector
Vector currGrammars = (Vector)grammar.getImportedGrammars();
if (currGrammars == null) {
return true;
}
Vector grammars = ((Vector)currGrammars.clone());
SchemaGrammar sg1, sg2;
Vector gs;
// for all (recursively) imported grammars
for (int i = 0; i < grammars.size(); i++) {
// get the grammar
sg1 = (SchemaGrammar)grammars.elementAt(i);
// check whether the bucket has one with the same tns
sg2 = getGrammar(sg1.fTargetNamespace);
if (sg2 == null) {
// we need to add grammars imported by sg1 too
gs = sg1.getImportedGrammars();
// for all grammars imported by sg2, but not in the vector
// we add them to the vector
if(gs == null) continue;
for (int j = gs.size() - 1; j >= 0; j--) {
sg2 = (SchemaGrammar)gs.elementAt(j);
if (!grammars.contains(sg2))
grammars.addElement(sg2);
}
}
// we found one with the same target namespace, ignore it
else {
grammars.remove(sg1);
}
}
// now we have all imported grammars stored in the vector. add them
for (int i = grammars.size() - 1; i >= 0; i--) {
putGrammar((SchemaGrammar)grammars.elementAt(i));
}
return true;
}
/**
* get all grammars in the registry
*
* @return an array of SchemaGrammars.
*/
public SchemaGrammar[] getGrammars() {
// get the number of grammars
int count = fGrammarRegistry.size() + (fNoNSGrammar==null ? 0 : 1);
SchemaGrammar[] grammars = new SchemaGrammar[count];
// get grammars with target namespace
Enumeration schemas = fGrammarRegistry.elements();
int i = 0;
while (schemas.hasMoreElements())
grammars[i++] = (SchemaGrammar)schemas.nextElement();
// add the grammar without target namespace, if any
if (fNoNSGrammar != null)
grammars[count-1] = fNoNSGrammar;
return grammars;
}
/**
* Clear the registry.
* REVISIT: update to use another XSGrammarBucket
*/
public void reset() {
fNoNSGrammar = null;
fGrammarRegistry.clear();
}
} // class XSGrammarBucket
