/*
* Licensed to Crate under one or more contributor license agreements.
* See the NOTICE file distributed with this work for additional
* information regarding copyright ownership. Crate licenses this file
* to you 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.
*
* However, if you have executed another commercial license agreement
* with Crate these terms will supersede the license and you may use the
* software solely pursuant to the terms of the relevant commercial
* agreement.
*/
package io.crate.data;
import java.util.function.BooleanSupplier;
import java.util.function.Function;
public class FilteringBatchIterator extends ForwardingBatchIterator {
private final BatchIterator delegate;
private final BooleanSupplier filter;
public FilteringBatchIterator(BatchIterator delegate, Function<Columns, BooleanSupplier> filterGenerator) {
this.delegate = delegate;
this.filter = filterGenerator.apply(delegate.rowData());
}
@Override
protected BatchIterator delegate() {
return delegate;
}
@Override
public boolean moveNext() {
while (delegate.moveNext()) {
if (filter.getAsBoolean()) {
return true;
}
}
return false;
}
}