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A library provides facade api for data accessing.

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package net.cassite.daf4j;

import java.util.Arrays;

/**
 * 表示一个普通的表达式(表达式返回值不能进行AndOr操作,也不能进行比较操作)
 */
public class Expression extends Parameter implements IExpression {
        final ExpressionTypes type;
        final Object[] parameters;

        Expression(ExpressionTypes type, Object... parameters) {
                this.type = type;
                this.parameters = Arrays.copyOf(parameters, parameters.length);
        }

        @Override
        public String toString() {
                return DataUtils.expToStringUtil(type, parameters);
        }

        @Override
        public ExpressionTypes expType() {
                return type;
        }

        @Override
        public Object[] expArgs() {
                return parameters;
        }

        @Override
        public boolean equals(Object o) {
                return DataUtils.expressionEquals(this, o);
        }

        @Override
        public int hashCode() {
                return DataUtils.expressionHashCode(this);
        }
}