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* 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.ingres;
import java.io.IOException;
import org.apache.cayenne.access.translator.select.QueryAssembler;
import org.apache.cayenne.access.translator.select.TrimmingQualifierTranslator;
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
*/
class IngresQualifierTranslator extends TrimmingQualifierTranslator {
IngresQualifierTranslator(QueryAssembler queryAssembler) {
super(queryAssembler, IngresAdapter.TRIM_FUNCTION);
}
@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 ingres version of LOCATE is different, so swap them back
swapNodeChildren((ASTFunctionCall)node, 0, 1);
}
}
}
@Override
protected void appendFunction(ASTFunctionCall functionExpression) {
if("CONCAT".equals(functionExpression.getFunctionName())) {
// noop
} else if("LOCATE".equals(functionExpression.getFunctionName())) {
// order of args in ingres version of LOCATE is different
// LOCATE(substr, str) -> LOCATE(str, substr)
out.append("LOCATE");
swapNodeChildren(functionExpression, 0, 1);
} else if("TRIM".equals(functionExpression.getFunctionName())) {
// simple TRIM removes only trailing spaces
out.append("LTRIM(RTRIM");
} else {
super.appendFunction(functionExpression);
}
}
@Override
protected void appendFunctionArgDivider(ASTFunctionCall functionExpression) {
if("CONCAT".equals(functionExpression.getFunctionName())) {
out.append(" + ");
} else {
super.appendFunctionArgDivider(functionExpression);
}
}
@Override
protected void appendFunctionArg(Object value, ASTFunctionCall functionExpression) throws IOException {
if("SUBSTRING".equals(functionExpression.getFunctionName())) {
out.append("CAST(");
super.appendFunctionArg(value, functionExpression);
clearLastFunctionArgDivider(functionExpression);
out.append(" AS INTEGER)");
appendFunctionArgDivider(functionExpression);
} else {
super.appendFunctionArg(value, functionExpression);
}
}
@Override
protected void clearLastFunctionArgDivider(ASTFunctionCall functionExpression) {
if("CONCAT".equals(functionExpression.getFunctionName())) {
out.delete(out.length() - " + ".length(), out.length());
} else {
super.clearLastFunctionArgDivider(functionExpression);
if("TRIM".equals(functionExpression.getFunctionName())) {
out.append(")");
}
}
}
@Override
protected void appendExtractFunction(ASTExtract functionExpression) {
switch (functionExpression.getPart()) {
case DAY_OF_WEEK:
case DAY_OF_MONTH:
case DAY_OF_YEAR:
// ingres variants are without '_'
out.append(functionExpression.getPart().name().replace("_", ""));
break;
default:
appendFunction(functionExpression);
}
}
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);
}
}