| /* |
| * 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 groovy.sql; |
| |
| import groovy.lang.GroovyRuntimeException; |
| 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.expr.VariableExpression; |
| import org.codehaus.groovy.ast.stmt.ReturnStatement; |
| import org.codehaus.groovy.syntax.Token; |
| import org.codehaus.groovy.syntax.Types; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| public class SqlWhereVisitor extends CodeVisitorSupport { |
| |
| private final StringBuffer buffer = new StringBuffer(); |
| private final List<Object> parameters = new ArrayList<Object>(); |
| |
| 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 || left 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()); |
| } |
| |
| @Override |
| public void visitVariableExpression(VariableExpression expression) { |
| throw new GroovyRuntimeException("DataSet currently doesn't support arbitrary variables, only literals: found attempted reference to variable '" + expression.getName() + "'"); |
| } |
| |
| public List<Object> 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(); |
| } |
| } |
| } |