io.continual.util.data.exprEval.ExprDataSourceStack Maven / Gradle / Ivy
/*
* Copyright 2019, Continual.io
*
* 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.
*/
package io.continual.util.data.exprEval;
public class ExprDataSourceStack implements ExprDataSource
{
public ExprDataSourceStack ( ExprDataSource... sources )
{
fSources = sources;
}
@Override
public Object eval ( String label )
{
for ( ExprDataSource src : fSources )
{
final Object val = src.eval ( label );
if ( val != null ) return val;
}
return null;
}
private final ExprDataSource[] fSources;
}