/*****************************************************************
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
****************************************************************/
package org.apache.cayenne.dba.sqlite;
import org.apache.cayenne.access.translator.select.QualifierTranslator;
import org.apache.cayenne.access.translator.select.QueryAssembler;
import org.apache.cayenne.exp.Expression;
import org.apache.cayenne.exp.parser.ASTExtract;
import org.apache.cayenne.exp.parser.ASTFunctionCall;
import org.apache.cayenne.exp.parser.Node;
/**
* @since 4.0
*/
public class SQLiteQualifierTranslator extends QualifierTranslator {
public SQLiteQualifierTranslator(QueryAssembler queryAssembler) {
super(queryAssembler);
}
@Override
public void endNode(Expression node, Expression parentNode) {
super.endNode(node, parentNode);
if(node.getType() == Expression.FUNCTION_CALL) {
if("LOCATE".equals(((ASTFunctionCall)node).getFunctionName())) {
// order of args in INSTR is different, so swap them back
swapNodeChildren((ASTFunctionCall)node, 0, 1);
}
}
}
@Override
protected void appendFunction(ASTFunctionCall functionExpression) {
switch (functionExpression.getFunctionName()) {
case "MOD":
case "CONCAT":
// noop
break;
case "SUBSTRING":
out.append("SUBSTR");
break;
case "LOCATE":
// LOCATE(substr, str) -> INSTR(str, substr)
out.append("INSTR");
swapNodeChildren(functionExpression, 0, 1);
break;
default:
super.appendFunction(functionExpression);
}
}
@Override
protected void appendFunctionArgDivider(ASTFunctionCall functionExpression) {
switch (functionExpression.getFunctionName()) {
case "MOD":
out.append(" % ");
break;
case "CONCAT":
out.append(" || ");
break;
default:
super.appendFunctionArgDivider(functionExpression);
}
}
@Override
protected void clearLastFunctionArgDivider(ASTFunctionCall functionExpression) {
switch (functionExpression.getFunctionName()) {
case "MOD":
out.delete(out.length() - 3, out.length());
break;
case "CONCAT":
out.delete(out.length() - 4, out.length());
break;
default:
super.clearLastFunctionArgDivider(functionExpression);
}
if(functionExpression instanceof ASTExtract) {
out.append(") as integer)");
}
}
@Override
protected boolean parenthesisNeeded(Expression node, Expression parentNode) {
if (node.getType() == Expression.FUNCTION_CALL) {
if (node instanceof ASTExtract) {
return false;
}
}
return super.parenthesisNeeded(node, parentNode);
}
/**
* Translates to cast(strftime('format', column) as integer).
* Depends on connection property "date_class", can be set in connection URL (date_class=text).
*
* https://www.sqlite.org/lang_datefunc.html
*/
@Override
protected void appendExtractFunction(ASTExtract functionExpression) {
out.append("cast(strftime(");
switch (functionExpression.getPart()) {
case YEAR:
out.append("'%Y'");
break;
case MONTH:
out.append("'%m'");
break;
case WEEK:
out.append("'%W'");
break;
case DAY:
case DAY_OF_MONTH:
out.append("'%d'");
break;
case DAY_OF_WEEK:
out.append("'%w'");
break;
case DAY_OF_YEAR:
out.append("'%j'");
break;
case HOUR:
out.append("'%H'");
break;
case MINUTE:
out.append("'%M'");
break;
case SECOND:
out.append("'%S'");
break;
}
out.append(", ");
}
private void swapNodeChildren(Node node, int i, int j) {
Node ni = node.jjtGetChild(i);
Node nj = node.jjtGetChild(j);
node.jjtAddChild(ni, j);
node.jjtAddChild(nj, i);
}
}