package com.alibaba.qlexpress4.runtime.operator.compare;

import com.alibaba.qlexpress4.QLOptions;
import com.alibaba.qlexpress4.QLPrecedences;
import com.alibaba.qlexpress4.exception.ErrorReporter;
import com.alibaba.qlexpress4.runtime.QRuntime;
import com.alibaba.qlexpress4.runtime.Value;
import com.alibaba.qlexpress4.runtime.operator.base.BaseBinaryOperator;

/**
 * @author bingo
 */
public class LessEqualOperator extends BaseBinaryOperator {
    private static final LessEqualOperator INSTANCE = new LessEqualOperator();
    
    private LessEqualOperator() {
    }
    
    public static LessEqualOperator getInstance() {
        return INSTANCE;
    }
    
    @Override
    public String getOperator() {
        return "<=";
    }
    
    @Override
    public int getPriority() {
        return QLPrecedences.COMPARE;
    }
    
    @Override
    public Object execute(Value left, Value right, QRuntime qRuntime, QLOptions qlOptions,
        ErrorReporter errorReporter) {
        if (qlOptions.isAvoidNullPointer() && (left.get() == null || right.get() == null)) {
            return false;
        }
        return compare(left, right, errorReporter) <= 0;
    }
}
