ComputedListWertValue.java

/**
 * 
 */
package de.urszeidler.shr5.ecp.binding;

import java.math.BigDecimal;

import org.eclipse.core.databinding.observable.list.IObservableList;
import org.eclipse.core.databinding.observable.value.ComputedValue;

import de.urszeidler.eclipse.shr5.GeldWert;

public final class ComputedListWertValue extends ComputedValue {
    private final IObservableList observeValue;

    public ComputedListWertValue(IObservableList observeValue) {
        this.observeValue = observeValue;
    }

    @Override
    protected Object calculate() {
        return calcListenNormWert(observeValue);
    }

    private Object calcListenNormWert(IObservableList observeValue) {
        BigDecimal summ = new BigDecimal(0);
        for (int i = 0; i < observeValue.size(); i++) {
            GeldWert abstaktGegenstand = (GeldWert)observeValue.get(i);
            if (abstaktGegenstand.getWert() != null)
                summ = summ.add(abstaktGegenstand.getWert());
        }
        return summ;
    }
}