// Path: src/joquery/core/QueryException.java
// public class QueryException extends Exception
// {
//     public QueryException(String message)
//     {
//         super(message);
//     }
// 
//     public QueryException(String message, Throwable cause)
//     {
//         super(message, cause);
//     }
// }
// 
// Path: src/joquery/core/QueryMode.java
// public enum QueryMode
// {
//     SELECT,
//     FROM,
//     WHERE,
//     SORT
// }
// 
// Path: src/joquery/core/collection/expr/IExpr.java
// public interface IExpr<T>
// {
//     boolean supportsMode(QueryMode mode);
// 
//     boolean add(IExpr<T> expr);
// 
//     Object evaluate(T t) throws QueryException;
// }


import joquery.core.QueryException;
import joquery.core.QueryMode;
import joquery.core.collection.expr.IExpr;
package joquery.core.collection.expr.condition;


/**
 * User: Adipa
 * Date: 10/6/12
 * Time: 9:31 PM
 */
public abstract class ConditionalExpr<T> implements IExpr<T>
{
    protected IExpr<T> left;
    protected IExpr<T> right;

    @Override
    public boolean supportsMode(QueryMode mode)
    {
        return mode == QueryMode.WHERE;
    }

    @Override
    public boolean add(IExpr<T> expr)
    {
        if (left == null)
        {
            left = expr;
            return true;
        }
        else if (right == null)
        {
            right = expr;
            return true;
        }
        return false;
    }

// Path: src/joquery/core/QueryException.java
// public class QueryException extends Exception
// {
//     public QueryException(String message)
//     {
//         super(message);
//     }
// 
//     public QueryException(String message, Throwable cause)
//     {
//         super(message, cause);
//     }
// }
// 
// Path: src/joquery/core/QueryMode.java
// public enum QueryMode
// {
//     SELECT,
//     FROM,
//     WHERE,
//     SORT
// }
// 
// Path: src/joquery/core/collection/expr/IExpr.java
// public interface IExpr<T>
// {
//     boolean supportsMode(QueryMode mode);
// 
//     boolean add(IExpr<T> expr);
// 
//     Object evaluate(T t) throws QueryException;
// }


// Path: src/joquery/core/collection/expr/condition/ConditionalExpr.java
import joquery.core.QueryException;
import joquery.core.QueryMode;
import joquery.core.collection.expr.IExpr;

package joquery.core.collection.expr.condition;


/**
 * User: Adipa
 * Date: 10/6/12
 * Time: 9:31 PM
 */
public abstract class ConditionalExpr<T> implements IExpr<T>
{
    protected IExpr<T> left;
    protected IExpr<T> right;

    @Override
    public boolean supportsMode(QueryMode mode)
    {
        return mode == QueryMode.WHERE;
    }

    @Override
    public boolean add(IExpr<T> expr)
    {
        if (left == null)
        {
            left = expr;
            return true;
        }
        else if (right == null)
        {
            right = expr;
            return true;
        }
        return false;
    }

    protected void validate() throws QueryException