/*
* Copyright 2003-2007 the original author or authors.
*
* Licensed 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 groovy.sql;
import java.util.ArrayList;
import java.util.List;
import org.codehaus.groovy.ast.CodeVisitorSupport;
import org.codehaus.groovy.ast.expr.BinaryExpression;
import org.codehaus.groovy.ast.expr.BooleanExpression;
import org.codehaus.groovy.ast.expr.ConstantExpression;
import org.codehaus.groovy.ast.expr.Expression;
import org.codehaus.groovy.ast.expr.PropertyExpression;
import org.codehaus.groovy.ast.stmt.ReturnStatement;
import org.codehaus.groovy.syntax.Token;
import org.codehaus.groovy.syntax.Types;
/**
* @author James Strachan
* @version $Revision: 7922 $
*/
public class SqlWhereVisitor extends CodeVisitorSupport {
private final StringBuffer buffer = new StringBuffer();
private final List parameters = new ArrayList();
public String getWhere() {
return buffer.toString();
}
public void visitReturnStatement(ReturnStatement statement) {
statement.getExpression().visit(this);
}
public void visitBinaryExpression(BinaryExpression expression) {
Expression left = expression.getLeftExpression();
Expression right = expression.getRightExpression();
boolean leaf = (right instanceof ConstantExpression);
if (!leaf) buffer.append("(");
left.visit(this);
buffer.append(" ");
Token token = expression.getOperation();
buffer.append(tokenAsSql(token));
buffer.append(" ");
right.visit(this);
if (!leaf) buffer.append(")");
}
public void visitBooleanExpression(BooleanExpression expression) {
expression.getExpression().visit(this);
}
public void visitConstantExpression(ConstantExpression expression) {
getParameters().add(expression.getValue());
buffer.append("?");
}
public void visitPropertyExpression(PropertyExpression expression) {
buffer.append(expression.getPropertyAsString());
}
public List getParameters() {
return parameters;
}
protected String tokenAsSql(Token token) {
switch (token.getType()) {
case Types.COMPARE_EQUAL :
return "=";
case Types.LOGICAL_AND :
return "and";
case Types.LOGICAL_OR :
return "or";
default :
return token.getText();
}
}
}