/**
 * Copyright (C) 2010-14 diirt developers. See COPYRIGHT.TXT
 * All rights reserved. Use is subject to license terms. See LICENSE.TXT
 */
package org.diirt.datasource;

import org.diirt.datasource.expression.DesiredRateExpression;

/**
 *
 * @author carcassi
 */
public class ReadExpressionTester {

    private DesiredRateExpression<?> expression;
    private ReadRecipe readRecipe;
    private PVDirector<?> pvReaderDirector = new PVDirector<Object>(null, null, null, null, null, null);

    public ReadExpressionTester(DesiredRateExpression<?> expression) {
        this.expression = expression;
        pvReaderDirector.connectReadExpression(expression);
    }

    public ReadRecipe getCurrentReadRecipe() {
        return pvReaderDirector.getCurrentReadRecipe();
    }

    public void writeValue(String name, Object value) {
        boolean written = false;
        for (ChannelReadRecipe channelRecipe : getCurrentReadRecipe().getChannelReadRecipes()) {
            if (channelRecipe.getChannelName().equals(name)) {
                @SuppressWarnings("unchecked")
                ValueCache<Object> cache = (ValueCache<Object>) channelRecipe.getReadSubscription().getValueCache();
                cache.writeValue(value);
                written = true;
            }
        }
        if (!written) {
            throw new IllegalStateException("Can't find recipe for channel '" + name + "'");
        }
    }

    public ChannelReadRecipe recipeFor(String channelName) {
        for (ChannelReadRecipe channelRecipe : getCurrentReadRecipe().getChannelReadRecipes()) {
            if (channelRecipe.getChannelName().equals(channelName)) {
                return channelRecipe;
            }
        }
        return null;
    }

    public ReadRecipe getReadRecipe() {
        return getCurrentReadRecipe();
    }

    public ReadFunction<?> getFunction() {
        return expression.getFunction();
    }

    public DesiredRateExpression<?> getExpression() {
        return expression;
    }

    public Object getValue() {
        return expression.getFunction().readValue();
    }
}