org.diirt.datasource.formula.LastOfChannelExpression Maven / Gradle / Ivy

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An extensible formula language suitable for real-time calculation.

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/**
 * Copyright (C) 2010-18 diirt developers. See COPYRIGHT.TXT
 * All rights reserved. Use is subject to license terms. See LICENSE.TXT
 */
package org.diirt.datasource.formula;

import java.util.List;
import org.diirt.datasource.ReadRecipeBuilder;
import org.diirt.datasource.ReadFunction;
import org.diirt.datasource.expression.DesiredRateExpression;
import org.diirt.datasource.expression.DesiredRateExpressionImpl;
import org.diirt.datasource.expression.DesiredRateExpressionList;
import static org.diirt.datasource.ExpressionLanguage.*;
import org.diirt.datasource.PVDirector;

/**
 *
 * @author carcassi
 */
class LastOfChannelExpression implements DesiredRateExpression {

    private final DesiredRateExpression expression;
    private final Class clazz;

    public LastOfChannelExpression(String name, Class clazz) {
        this.expression = latestValueOf(channel(name, clazz, Object.class));
        this.clazz = clazz;
    }

    @Override
    public DesiredRateExpression as(String name) {
        return expression.as(name);
    }

    @Override
    public String getName() {
        return expression.getName();
    }

    @Override
    public void fillReadRecipe(PVDirector director, ReadRecipeBuilder builder) {
        expression.fillReadRecipe(director, builder);
    }

    @Override
    public ReadFunction getFunction() {
        return expression.getFunction();
    }

    @Override
    public DesiredRateExpressionImpl getDesiredRateExpressionImpl() {
        return expression.getDesiredRateExpressionImpl();
    }

    @Override
    public DesiredRateExpressionList and(DesiredRateExpressionList expressions) {
        return expression.and(expressions);
    }

    @Override
    public List> getDesiredRateExpressions() {
        return expression.getDesiredRateExpressions();
    }

    public  LastOfChannelExpression cast(Class clazz) {
        if (clazz.isAssignableFrom(this.clazz)) {
            @SuppressWarnings("unchecked")
            LastOfChannelExpression result = (LastOfChannelExpression) this;
            return result;
        }

        if (this.clazz.isAssignableFrom(clazz)) {
            return new LastOfChannelExpression(getName(), clazz);
        }

        throw new IllegalArgumentException("Cannot cast expression of type " + this.clazz + " to type " + clazz);
    }

    public Class getType() {
        return clazz;
    }

}