| /* |
| * 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 $Revision$ |
| */ |
| 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(); |
| } |
| } |
| } |