/*
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* 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.resolver.command;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import java.util.Map.Entry;
import org.teiid.api.exception.query.QueryMetadataException;
import org.teiid.api.exception.query.QueryResolverException;
import org.teiid.core.TeiidComponentException;
import org.teiid.query.metadata.QueryMetadataInterface;
import org.teiid.query.metadata.TempMetadataAdapter;
import org.teiid.query.resolver.ProcedureContainerResolver;
import org.teiid.query.resolver.QueryResolver;
import org.teiid.query.resolver.VariableResolver;
import org.teiid.query.resolver.util.ResolverUtil;
import org.teiid.query.resolver.util.ResolverVisitor;
import org.teiid.query.sql.ProcedureReservedWords;
import org.teiid.query.sql.lang.Command;
import org.teiid.query.sql.lang.SetClause;
import org.teiid.query.sql.lang.Update;
import org.teiid.query.sql.symbol.Constant;
import org.teiid.query.sql.symbol.ElementSymbol;
import org.teiid.query.sql.symbol.Expression;
import org.teiid.query.sql.symbol.GroupSymbol;
/**
* This class knows how to expand and resolve UDPATE commands.
*/
public class UpdateResolver extends ProcedureContainerResolver implements VariableResolver {
/**
* @see org.teiid.query.resolver.ProcedureContainerResolver#resolveProceduralCommand(org.teiid.query.sql.lang.Command, org.teiid.query.metadata.TempMetadataAdapter)
*/
public void resolveProceduralCommand(Command command, TempMetadataAdapter metadata)
throws QueryMetadataException, QueryResolverException, TeiidComponentException {
//Cast to known type
Update update = (Update) command;
// Resolve elements and functions
Set<GroupSymbol> groups = new HashSet<GroupSymbol>();
groups.add(update.getGroup());
for (SetClause clause : update.getChangeList().getClauses()) {
ResolverVisitor.resolveLanguageObject(clause.getSymbol(), groups, null, metadata);
}
QueryResolver.resolveSubqueries(command, metadata, groups);
ResolverVisitor.resolveLanguageObject(update, groups, update.getExternalGroupContexts(), metadata);
}
/**
* @param metadata
* @param group
* @return
* @throws TeiidComponentException
* @throws QueryMetadataException
*/
protected String getPlan(QueryMetadataInterface metadata,
GroupSymbol group) throws TeiidComponentException,
QueryMetadataException {
return metadata.getUpdatePlan(group.getMetadataID());
}
/**
* @see org.teiid.query.resolver.VariableResolver#getVariableValues(org.teiid.query.sql.lang.Command, org.teiid.query.metadata.QueryMetadataInterface)
*/
public Map<ElementSymbol, Expression> getVariableValues(Command command, boolean changingOnly,
QueryMetadataInterface metadata) throws QueryMetadataException,
TeiidComponentException {
Map<ElementSymbol, Expression> result = new HashMap<ElementSymbol, Expression>();
Update update = (Update) command;
Map<ElementSymbol, Expression> changing = update.getChangeList().getClauseMap();
for (Entry<ElementSymbol, Expression> entry : changing.entrySet()) {
ElementSymbol leftSymbol = entry.getKey().clone();
leftSymbol.getGroupSymbol().setName(ProcedureReservedWords.CHANGING);
result.put(leftSymbol, new Constant(Boolean.TRUE));
if (!changingOnly) {
leftSymbol = leftSymbol.clone();
leftSymbol.getGroupSymbol().setName(ProcedureReservedWords.INPUTS);
result.put(leftSymbol, entry.getValue());
}
}
Collection<ElementSymbol> insertElmnts = ResolverUtil.resolveElementsInGroup(update.getGroup(), metadata);
insertElmnts.removeAll(changing.keySet());
Iterator<ElementSymbol> defaultIter = insertElmnts.iterator();
while(defaultIter.hasNext()) {
ElementSymbol varSymbol = defaultIter.next().clone();
varSymbol.getGroupSymbol().setName(ProcedureReservedWords.CHANGING);
result.put(varSymbol, new Constant(Boolean.FALSE));
}
return result;
}
}