/*****************************************************************************
* Copyright (c) 2015 CEA LIST.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Dirk Fauth <dirk.fauth@googlemail.com> - Initial API and implementation
*
*****************************************************************************/
package org.eclipse.nebula.widgets.nattable.formula.function;
import java.util.ArrayList;
import java.util.List;
/**
* Subclasses are intended to process values that are set to it.
*
* @since 1.4
*/
public abstract class AbstractFunction implements FunctionValue, OperatorFunctionValue {
protected List<FunctionValue> values;
public AbstractFunction() {
this(new ArrayList<FunctionValue>());
}
public AbstractFunction(List<FunctionValue> values) {
if (values == null) {
throw new IllegalStateException("values can not be null"); //$NON-NLS-1$
}
this.values = values;
}
@Override
public void addFunctionValue(FunctionValue value) {
if (value != null) {
if (value instanceof MultipleValueFunctionValue) {
this.values.addAll(((MultipleValueFunctionValue) value).getValue());
}
else {
this.values.add(value);
}
}
}
/**
*
* @return <code>true</code> if no values to process are added to this
* function, <code>false</code> otherwise.
*/
public boolean isEmpty() {
return this.values.isEmpty();
}
}