/*
* 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.translator.google.visitor;
import static org.teiid.language.SQLConstants.Reserved.*;
import org.teiid.language.Function;
import org.teiid.language.LanguageObject;
import org.teiid.language.Like;
import org.teiid.language.Literal;
import org.teiid.language.NamedTable;
import org.teiid.language.SQLConstants.Tokens;
import org.teiid.language.Select;
import org.teiid.translator.SourceSystemFunctions;
import org.teiid.translator.TypeFacility;
import org.teiid.translator.google.SpreadsheetExecutionFactory;
import org.teiid.translator.google.api.SpreadsheetOperationException;
import org.teiid.translator.google.api.metadata.SpreadsheetInfo;
import org.teiid.translator.google.api.metadata.Worksheet;
/**
* Translates SQL SELECT queries
*
* @author felias
*
*/
public class SpreadsheetSQLVisitor extends SpreadsheetCriteriaVisitor {
private Integer limitValue = null;
private Integer offsetValue = null;
public SpreadsheetSQLVisitor(SpreadsheetInfo spreadsheetInfo) {
super(spreadsheetInfo);
}
public String getWorksheetTitle() {
return worksheetTitle;
}
/**
* Return only col name e.g. "A"
*/
@Override
protected String replaceElementName(String group, String element) {
Worksheet worksheetSourceName=info.getWorksheetByName(worksheetTitle);
if(worksheetSourceName==null){
throw new SpreadsheetOperationException(SpreadsheetExecutionFactory.UTIL.gs("missing_worksheet", worksheetTitle)); //$NON-NLS-1$
}
String columnId=worksheetSourceName.getColumnID(element);
if(columnId==null){
throw new SpreadsheetOperationException("Column "+element +" doesn't exist in the worksheet "+worksheetTitle);
}
return columnId;
}
public String getTranslatedSQL() {
return buffer.toString();
}
public void translateSQL(LanguageObject obj) {
append(obj);
}
public void visit(Select obj) {
buffer.append(SELECT).append(Tokens.SPACE);
if (obj.getFrom() != null && !obj.getFrom().isEmpty()) {
NamedTable table = ((NamedTable)obj.getFrom().get(0));
this.worksheetTitle = table.getName();
if (table.getMetadataObject().getNameInSource() != null) {
this.worksheetTitle = table.getMetadataObject().getNameInSource();
}
}
append(obj.getDerivedColumns());
if (obj.getWhere() != null) {
buffer.append(Tokens.SPACE).append(WHERE).append(Tokens.SPACE);
append(obj.getWhere());
}
if (obj.getGroupBy() != null) {
buffer.append(Tokens.SPACE);
append(obj.getGroupBy());
}
if (obj.getOrderBy() != null) {
buffer.append(Tokens.SPACE);
append(obj.getOrderBy());
}
if (obj.getLimit() != null) {
if (obj.getLimit().getRowOffset() > 0) {
offsetValue = obj.getLimit().getRowOffset();
}
limitValue = obj.getLimit().getRowLimit();
}
}
public Integer getLimitValue() {
return limitValue;
}
public Integer getOffsetValue() {
return offsetValue;
}
@Override
public void visit(Function function) {
if (function.getName().equalsIgnoreCase(SourceSystemFunctions.DAYOFMONTH)) {
function.setName("day"); //$NON-NLS-1$
} else if (function.getName().equalsIgnoreCase(SourceSystemFunctions.UCASE)) {
function.setName("upper"); //$NON-NLS-1$
} else if (function.getName().equalsIgnoreCase(SourceSystemFunctions.LCASE)) {
function.setName("lower"); //$NON-NLS-1$
} else if (function.getName().equalsIgnoreCase(SourceSystemFunctions.DAYOFWEEK)) {
function.setName("weekday"); //$NON-NLS-1$
}
super.visit(function);
}
@Override
public void visit(Literal obj) {
if (obj.getValue() == null) {
super.visit(obj);
} else if (obj.getType() == TypeFacility.RUNTIME_TYPES.DATE) {
buffer.append("date ").append('\"').append(obj.getValue()).append('\"'); //$NON-NLS-1$
} else if (obj.getType() == TypeFacility.RUNTIME_TYPES.TIME) {
buffer.append("timeofday ").append('\"').append(obj.getValue()).append('\"'); //$NON-NLS-1$
} else if (obj.getType() == TypeFacility.RUNTIME_TYPES.TIMESTAMP) {
String val = obj.getValue().toString();
int i = val.lastIndexOf('.');
//truncate to mills
if (i != -1 && i < val.length() - 4) {
val = val.substring(0, i + 4);
}
buffer.append("datetime ").append('\"').append(val).append('\"'); //$NON-NLS-1$
} else {
super.visit(obj);
}
}
@Override
public void visit(Like obj) {
if (obj.isNegated()) {
buffer.append("("); //$NON-NLS-1$
}
super.visit(obj);
if (obj.isNegated()) {
buffer.append(" AND "); //$NON-NLS-1$
visitNode(obj.getLeftExpression());
buffer.append(" IS NOT NULL)"); //$NON-NLS-1$
}
}
@Override
protected boolean isUpdate() {
return false;
}
}