Package groovy.sql

Source Code of groovy.sql.SqlWhereVisitor

/*
* Copyright 2003-2012 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 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;

/**
* @author James Strachan
* @version $Revision$
*/
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();
        }
    }
}
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