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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.search.yql;
import com.google.common.base.Predicate;
/**
* Represents a projection command which affects the output record.
*/
enum ProjectOperator implements Operator {
FIELD(ExpressionOperator.class, String.class), // FIELD expr name
RECORD(ExpressionOperator.class, String.class), // RECORD expr name
MERGE_RECORD(String.class); // MERGE_RECORD name (alias of record to merge)
private final ArgumentsTypeChecker checker;
public static Predicate<OperatorNode<? extends Operator>> IS = new Predicate<OperatorNode<? extends Operator>>() {
@Override
public boolean apply(OperatorNode<? extends Operator> input) {
return input.getOperator() instanceof ProjectOperator;
}
};
private ProjectOperator(Object... types) {
checker = TypeCheckers.make(this, types);
}
@Override
public void checkArguments(Object... args) {
checker.check(args);
}
}
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