/*
* 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.operation;
import io.crate.analyze.symbol.Symbol;
import io.crate.data.Input;
import io.crate.data.Row;
import io.crate.operation.collect.CollectExpression;
import io.crate.operation.projectors.InputCondition;
import javax.annotation.Nullable;
import java.util.List;
import java.util.function.Predicate;
public class RowFilter implements Predicate<Row> {
private final Input<Boolean> filterCondition;
private final List<CollectExpression<Row, ?>> expressions;
public static Predicate<Row> create(InputFactory inputFactory, @Nullable Symbol filterSymbol) {
if (filterSymbol == null) {
return i -> true;
}
return new RowFilter(inputFactory, filterSymbol);
}
private RowFilter(InputFactory inputFactory, Symbol filterSymbol) {
InputFactory.Context<CollectExpression<Row, ?>> ctx = inputFactory.ctxForInputColumns();
//noinspection unchecked
filterCondition = (Input) ctx.add(filterSymbol);
expressions = ctx.expressions();
}
@Override
public boolean test(@Nullable Row row) {
//noinspection ForLoopReplaceableByForEach // avoids iterator allocation - rowFilter test is invoked per row
for (int i = 0, expressionsSize = expressions.size(); i < expressionsSize; i++) {
CollectExpression<Row, ?> expression = expressions.get(i);
expression.setNextRow(row);
}
return InputCondition.matches(filterCondition);
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
RowFilter rowFilter = (RowFilter) o;
if (!filterCondition.equals(rowFilter.filterCondition)) return false;
return expressions.equals(rowFilter.expressions);
}
@Override
public int hashCode() {
int result = filterCondition.hashCode();
result = 31 * result + expressions.hashCode();
return result;
}
}