/*
* 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.jdbc.hsql;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.teiid.language.Expression;
import org.teiid.language.Function;
import org.teiid.language.LanguageFactory;
import org.teiid.language.Literal;
import org.teiid.language.SQLConstants.NonReserved;
import org.teiid.translator.TypeFacility;
import org.teiid.translator.jdbc.ExtractFunctionModifier;
import org.teiid.translator.jdbc.FunctionModifier;
public class AddDiffModifier extends FunctionModifier {
private static Map<String, String> INTERVAL_MAP = new HashMap<String, String>();
static {
INTERVAL_MAP.put(NonReserved.SQL_TSI_DAY, ExtractFunctionModifier.DAY);
INTERVAL_MAP.put(NonReserved.SQL_TSI_HOUR, ExtractFunctionModifier.HOUR);
INTERVAL_MAP.put(NonReserved.SQL_TSI_MINUTE, ExtractFunctionModifier.MINUTE);
INTERVAL_MAP.put(NonReserved.SQL_TSI_MONTH, ExtractFunctionModifier.MONTH);
INTERVAL_MAP.put(NonReserved.SQL_TSI_SECOND, ExtractFunctionModifier.SECOND);
INTERVAL_MAP.put(NonReserved.SQL_TSI_YEAR, ExtractFunctionModifier.YEAR);
}
private boolean add;
private LanguageFactory factory;
public AddDiffModifier(boolean add, LanguageFactory factory) {
this.add = add;
this.factory = factory;
}
@Override
public List<?> translate(Function function) {
if (add) {
function.setName("dateadd"); //$NON-NLS-1$
} else {
function.setName("datediff"); //$NON-NLS-1$
}
Literal intervalType = (Literal)function.getParameters().get(0);
String interval = ((String)intervalType.getValue()).toUpperCase();
String newInterval = INTERVAL_MAP.get(interval);
if (newInterval != null) {
intervalType.setValue(newInterval);
return null;
}
if (add) {
if (interval.equals(NonReserved.SQL_TSI_FRAC_SECOND)) {
intervalType.setValue("MILLISECOND"); //$NON-NLS-1$
Expression[] args = new Expression[] {function.getParameters().get(1), factory.createLiteral(1000000, TypeFacility.RUNTIME_TYPES.INTEGER)};
function.getParameters().set(1, factory.createFunction("/", args, TypeFacility.RUNTIME_TYPES.INTEGER)); //$NON-NLS-1$
} else if (interval.equals(NonReserved.SQL_TSI_QUARTER)) {
intervalType.setValue(ExtractFunctionModifier.DAY);
Expression[] args = new Expression[] {function.getParameters().get(1), factory.createLiteral(91, TypeFacility.RUNTIME_TYPES.INTEGER)};
function.getParameters().set(1, factory.createFunction("*", args, TypeFacility.RUNTIME_TYPES.INTEGER)); //$NON-NLS-1$
} else {
intervalType.setValue(ExtractFunctionModifier.DAY);
Expression[] args = new Expression[] {function.getParameters().get(1), factory.createLiteral(7, TypeFacility.RUNTIME_TYPES.INTEGER)};
function.getParameters().set(1, factory.createFunction("*", args, TypeFacility.RUNTIME_TYPES.INTEGER)); //$NON-NLS-1$
}
return null;
}
if (interval.equals(NonReserved.SQL_TSI_FRAC_SECOND)) {
intervalType.setValue("MILLISECOND"); //$NON-NLS-1$
return Arrays.asList(function, " * 1000000"); //$NON-NLS-1$
} else if (interval.equals(NonReserved.SQL_TSI_QUARTER)) {
intervalType.setValue(ExtractFunctionModifier.DAY);
return Arrays.asList(function, " / 91"); //$NON-NLS-1$
}
intervalType.setValue(ExtractFunctionModifier.DAY);
return Arrays.asList(function, " / 7"); //$NON-NLS-1$
}
}