QueryId.java

/*
 * #%L
 * server
 * %%
 * Copyright (C) 2012 - 2015 valdasraps
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Lesser Public License for more details.
 * 
 * You should have received a copy of the GNU General Lesser Public
 * License along with this program.  If not, see
 * <http://www.gnu.org/licenses/lgpl-3.0.html>.
 * #L%
 */
package lt.emasina.resthub.server.query;

import lt.emasina.resthub.exception.QueryException;
import com.google.inject.assistedinject.Assisted;
import java.io.StringReader;
import javax.inject.Inject;
import lombok.EqualsAndHashCode;
import lombok.Getter;
import lombok.ToString;
import net.sf.jsqlparser.JSQLParserException;
import net.sf.jsqlparser.parser.CCJSqlParserManager;
import net.sf.jsqlparser.statement.Statement;
import net.sf.jsqlparser.statement.select.Select;
import org.apache.commons.codec.digest.DigestUtils;
import lt.emasina.resthub.server.factory.QueryFactory;
import org.hibernate.engine.jdbc.internal.BasicFormatterImpl;
import org.hibernate.engine.jdbc.internal.Formatter;

/**
 * QueryId
 * @author valdo
 */
@Getter
@EqualsAndHashCode(of = "id")
@ToString(of = { "id" })
public class QueryId {

    private static final Formatter SQL_FORMATTER = new BasicFormatterImpl();
    
    private final String id;
    private final String md5;
    private final String md5Raw;
    private final String sql;
    private final Select select;
    
    @Inject
    public QueryId(@Assisted String sql, CCJSqlParserManager pm) throws QueryException {
        try {
            Statement stmt = pm.parse(new StringReader(sql));
            if (stmt instanceof Select) {
                this.select = (Select) stmt;
                this.sql = SQL_FORMATTER.format(this.select.toString());
                this.md5 = getMD5(this.sql);
                this.md5Raw = getMD5(sql);
                this.id = QueryFactory.nextUID();
            } else {
                throw new QueryException("Only SELECT statements allowed!");
            }
        } catch (JSQLParserException ex) {
            throw new QueryException(ex.getCause().getMessage());
        }
    }
    
    public static String getMD5(String value) {
        return DigestUtils.md5Hex(value);
    }
    
}