/*
* 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.postgresql;
import java.util.ArrayList;
import java.util.List;
import org.teiid.language.Expression;
import org.teiid.language.Function;
import org.teiid.language.LanguageFactory;
import org.teiid.language.Literal;
public class LocateFunctionModifier extends org.teiid.translator.jdbc.LocateFunctionModifier {
public LocateFunctionModifier(LanguageFactory factory) {
super(factory);
}
@Override
public List<?> translate(Function function) {
modify(function);
List<Object> parts = new ArrayList<Object>();
List<Expression> params = function.getParameters();
parts.add("position("); //$NON-NLS-1$
parts.add(params.get(0));
parts.add(" in "); //$NON-NLS-1$
boolean useSubStr = false;
if (params.size() == 3) {
useSubStr = true;
if (params.get(2) instanceof Literal && ((Literal)params.get(2)).getValue() instanceof Integer) {
Integer value = (Integer)((Literal)params.get(2)).getValue();
if (value <= 1) {
useSubStr = false;
}
}
}
if (useSubStr) {
parts.add(0, "("); //$NON-NLS-1$
parts.add("substring("); //$NON-NLS-1$
parts.add(params.get(1));
parts.add(" from "); //$NON-NLS-1$
parts.add(params.get(2));
parts.add("))"); //$NON-NLS-1$
parts.add(" + "); //$NON-NLS-1$
if (params.get(2) instanceof Literal && ((Literal)params.get(2)).getValue() instanceof Integer) {
Integer value = (Integer)((Literal)params.get(2)).getValue();
parts.add(value - 1);
} else {
parts.add(params.get(2));
parts.add(" - 1"); //$NON-NLS-1$
}
} else {
parts.add(params.get(1));
}
parts.add(")"); //$NON-NLS-1$
return parts;
}
}