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Plugin providing DataNucleus implementation of the JDO API.
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/**********************************************************************
Copyright (c) 2010 Andy Jefferson and others. All rights reserved.
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.

Contributors:
   ...
**********************************************************************/
package org.datanucleus.api.jdo.query;

import java.util.ArrayList;
import java.util.List;

import javax.jdo.query.BooleanExpression;
import javax.jdo.query.ComparableExpression;
import javax.jdo.query.OrderExpression;
import javax.jdo.query.OrderExpression.OrderDirection;

import org.datanucleus.store.query.expression.DyadicExpression;
import org.datanucleus.store.query.expression.Expression;
import org.datanucleus.store.query.expression.InvokeExpression;
import org.datanucleus.store.query.expression.Literal;

import javax.jdo.query.PersistableExpression;

/**
 * Implementation of the methods for ComparableExpression.
 */
public class ComparableExpressionImpl extends ExpressionImpl implements ComparableExpression
{
    public ComparableExpressionImpl(PersistableExpression parent, String name)
    {
        super(parent, name);
    }

    public ComparableExpressionImpl(Expression queryExpr)
    {
        super(queryExpr);
    }

    public ComparableExpressionImpl(Class cls, String name, ExpressionType type)
    {
        super(cls, name, type);
    }

    /* (non-Javadoc)
     * @see javax.jdo.query.ComparableExpression#gt(javax.jdo.query.ComparableExpression)
     */
    public BooleanExpression gt(ComparableExpression expr)
    {
        Expression leftQueryExpr = queryExpr;
        Expression rightQueryExpr = ((ExpressionImpl)expr).getQueryExpression();

        org.datanucleus.store.query.expression.Expression queryExpr =
            new DyadicExpression(leftQueryExpr, org.datanucleus.store.query.expression.Expression.OP_GT, rightQueryExpr);
        return new BooleanExpressionImpl(queryExpr);
    }

    /* (non-Javadoc)
     * @see javax.jdo.query.ComparableExpression#gt(java.lang.Object)
     */
    public BooleanExpression gt(T t)
    {
        Expression leftQueryExpr = queryExpr;
        Expression rightQueryExpr = new Literal(t);

        org.datanucleus.store.query.expression.Expression queryExpr =
            new DyadicExpression(leftQueryExpr, org.datanucleus.store.query.expression.Expression.OP_GT, rightQueryExpr);
        return new BooleanExpressionImpl(queryExpr);
    }

    /* (non-Javadoc)
     * @see javax.jdo.query.ComparableExpression#gteq(javax.jdo.query.ComparableExpression)
     */
    public BooleanExpression gteq(ComparableExpression expr)
    {
        Expression leftQueryExpr = queryExpr;
        Expression rightQueryExpr = ((ExpressionImpl)expr).getQueryExpression();

        org.datanucleus.store.query.expression.Expression queryExpr =
            new DyadicExpression(leftQueryExpr, org.datanucleus.store.query.expression.Expression.OP_GTEQ, rightQueryExpr);
        return new BooleanExpressionImpl(queryExpr);
    }

    /* (non-Javadoc)
     * @see javax.jdo.query.ComparableExpression#gteq(java.lang.Object)
     */
    public BooleanExpression gteq(T t)
    {
        Expression leftQueryExpr = queryExpr;
        Expression rightQueryExpr = new Literal(t);

        org.datanucleus.store.query.expression.Expression queryExpr =
            new DyadicExpression(leftQueryExpr, org.datanucleus.store.query.expression.Expression.OP_GTEQ, rightQueryExpr);
        return new BooleanExpressionImpl(queryExpr);
    }

    /* (non-Javadoc)
     * @see javax.jdo.query.ComparableExpression#lt(javax.jdo.query.ComparableExpression)
     */
    public BooleanExpression lt(ComparableExpression expr)
    {
        Expression leftQueryExpr = queryExpr;
        Expression rightQueryExpr = ((ExpressionImpl)expr).getQueryExpression();

        org.datanucleus.store.query.expression.Expression queryExpr =
            new DyadicExpression(leftQueryExpr, org.datanucleus.store.query.expression.Expression.OP_LT, rightQueryExpr);
        return new BooleanExpressionImpl(queryExpr);
    }

    /* (non-Javadoc)
     * @see javax.jdo.query.ComparableExpression#lt(java.lang.Object)
     */
    public BooleanExpression lt(T t)
    {
        Expression leftQueryExpr = queryExpr;
        Expression rightQueryExpr = new Literal(t);

        org.datanucleus.store.query.expression.Expression queryExpr =
            new DyadicExpression(leftQueryExpr, org.datanucleus.store.query.expression.Expression.OP_LT, rightQueryExpr);
        return new BooleanExpressionImpl(queryExpr);
    }

    /* (non-Javadoc)
     * @see javax.jdo.query.ComparableExpression#lteq(javax.jdo.query.ComparableExpression)
     */
    public BooleanExpression lteq(ComparableExpression expr)
    {
        Expression leftQueryExpr = queryExpr;
        Expression rightQueryExpr = ((ExpressionImpl)expr).getQueryExpression();

        org.datanucleus.store.query.expression.Expression queryExpr =
            new DyadicExpression(leftQueryExpr, org.datanucleus.store.query.expression.Expression.OP_LTEQ, rightQueryExpr);
        return new BooleanExpressionImpl(queryExpr);
    }

    /* (non-Javadoc)
     * @see javax.jdo.query.ComparableExpression#lteq(java.lang.Object)
     */
    public BooleanExpression lteq(T t)
    {
        Expression leftQueryExpr = queryExpr;
        Expression rightQueryExpr = new Literal(t);

        org.datanucleus.store.query.expression.Expression queryExpr =
            new DyadicExpression(leftQueryExpr, org.datanucleus.store.query.expression.Expression.OP_LTEQ, rightQueryExpr);
        return new BooleanExpressionImpl(queryExpr);
    }

    /* (non-Javadoc)
     * @see javax.jdo.query.ComparableExpression#max()
     */
    public ComparableExpression max()
    {
        List args = new ArrayList();
        args.add(queryExpr);
        org.datanucleus.store.query.expression.Expression invokeExpr = new InvokeExpression(null, "max", args);
        return new NumericExpressionImpl(invokeExpr);
    }

    /* (non-Javadoc)
     * @see javax.jdo.query.ComparableExpression#min()
     */
    public ComparableExpression min()
    {
        List args = new ArrayList();
        args.add(queryExpr);
        org.datanucleus.store.query.expression.Expression invokeExpr = new InvokeExpression(null, "min", args);
        return new NumericExpressionImpl(invokeExpr);
    }

    /* (non-Javadoc)
     * @see javax.jdo.query.ComparableExpression#asc()
     */
    public OrderExpression asc()
    {
        return new OrderExpressionImpl(this, OrderDirection.ASC);
    }

    /* (non-Javadoc)
     * @see javax.jdo.query.ComparableExpression#desc()
     */
    public OrderExpression desc()
    {
        return new OrderExpressionImpl(this, OrderDirection.DESC);
    }
}