/*
* JBoss, Home of Professional Open Source.
* See the COPYRIGHT.txt file distributed with this work for information
* regarding copyright ownership. Some portions may be licensed
* to Red Hat, Inc. under one or more contributor license agreements.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA.
*/
package org.teiid.query.optimizer.xml;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import org.teiid.api.exception.query.QueryMetadataException;
import org.teiid.core.TeiidComponentException;
import org.teiid.core.TeiidRuntimeException;
import org.teiid.core.types.DataTypeManager;
import org.teiid.query.mapping.xml.MappingAttribute;
import org.teiid.query.mapping.xml.MappingDocument;
import org.teiid.query.mapping.xml.MappingElement;
import org.teiid.query.mapping.xml.MappingSourceNode;
import org.teiid.query.mapping.xml.MappingVisitor;
import org.teiid.query.mapping.xml.Navigator;
import org.teiid.query.metadata.QueryMetadataInterface;
import org.teiid.query.sql.symbol.ElementSymbol;
import org.teiid.query.sql.symbol.GroupSymbol;
/**
* This visitor resolves the "element" names on the mapping nodes to the planned
* sources defined at same or parent nodes.
*/
public class NameInSourceResolverVisitor extends MappingVisitor {
XMLPlannerEnvironment planEnv;
NameInSourceResolverVisitor(XMLPlannerEnvironment planEnv) {
this.planEnv = planEnv;
}
public void visit(MappingSourceNode element) {
if (element.getAliasResultName() == null) {
return;
}
Map symbols = element.getSymbolMap();
List elements = new LinkedList();
for (Iterator i = symbols.values().iterator(); i.hasNext();) {
Object symbol = i.next();
if (symbol instanceof ElementSymbol) {
elements.add(symbol);
}
}
//fix recusive references
Map fixedMap = QueryUtil.createSymbolMap(new GroupSymbol(element.getActualResultSetName()), element.getAliasResultName(), elements);
updateSymbolMap(element, fixedMap);
symbols.putAll(fixedMap);
}
public void visit(MappingAttribute attribute) {
String nameInSource = attribute.getNameInSource();
if (nameInSource != null) {
MappingSourceNode sourceNode = attribute.getSourceNode();
ElementSymbol symbol = resolveElementSymbol(nameInSource, sourceNode);
attribute.setElementSymbol(symbol);
}
}
public void visit(MappingElement element) {
String nameInSource = element.getNameInSource();
if (nameInSource != null) {
MappingSourceNode sourceNode = element.getSourceNode();
ElementSymbol symbol = resolveElementSymbol(nameInSource, sourceNode);
element.setElementSymbol(symbol);
}
}
private ElementSymbol resolveElementSymbol(String elementName, MappingSourceNode sourceNode) {
try {
QueryMetadataInterface metadata = this.planEnv.getGlobalMetadata();
ElementSymbol symbol = sourceNode.getMappedSymbol(new ElementSymbol(elementName));
Object elementID = metadata.getElementID(symbol.getName());
symbol.setMetadataID(elementID);
Object groupID = metadata.getGroupIDForElementID(elementID);
String groupName = metadata.getFullName(groupID);
GroupSymbol groupSymbol = new GroupSymbol(groupName);
groupSymbol.setMetadataID(groupID);
symbol.setGroupSymbol(groupSymbol);
symbol.setType(DataTypeManager.getDataTypeClass(metadata.getElementType(symbol.getMetadataID())));
return symbol;
} catch (QueryMetadataException e) {
throw new TeiidRuntimeException(e);
} catch (TeiidComponentException e) {
throw new TeiidRuntimeException(e);
}
}
/**
* Resolve all the "NameInSource" property nodes (element names), with the their results
* set queries.
* @param doc
* @param planEnv
*/
public static void resolveElements(MappingDocument doc, XMLPlannerEnvironment planEnv)
throws QueryMetadataException, TeiidComponentException {
NameInSourceResolverVisitor real = new NameInSourceResolverVisitor(planEnv);
try {
MappingVisitor visitor = new Navigator(true, real);
doc.acceptVisitor(visitor);
} catch (TeiidRuntimeException e) {
if (e.getCause() instanceof QueryMetadataException) {
throw (QueryMetadataException)e.getCause();
}
else if (e.getCause() instanceof TeiidComponentException) {
throw (TeiidComponentException)e.getCause();
}
throw e;
}
}
static void updateSymbolMap(MappingSourceNode source,
Map target) {
for (Iterator i = source.getSymbolMap().entrySet().iterator(); i.hasNext();) {
Map.Entry entry = (Map.Entry)i.next();
Object newValue = target.get(entry.getValue());
if (newValue != null) {
entry.setValue(newValue);
}
}
source.updateSymbolMapDependentValues();
}
}