or.java

来自「《Java与模式》一书的源代码」· Java 代码 · 共 38 行

package com.javapatterns.interpreter;

public class Or extends Expression
{
    private Expression left, right;

    public Or(Expression left, Expression right)
    {
        this.left = left;
        this.right = right;
    }

    public boolean interpret(Context ctx)
    {
        return left.interpret(ctx) || right.interpret(ctx);
    }

    public boolean equals(Object o)
    {
        if (o != null && o instanceof Or)
        {
            return this.left.equals(((Or)o).left) &&
            this.right.equals(((Or)o).right);
        }
        return false;
    }

    public int hashCode()
    {
        return (this.toString()).hashCode();
    }

    public String toString()
    {
        return "(" + left.toString() + " OR " + right.toString() + ")";
    }
}