or.java

《java与模式》所有源代码

package com.javapatterns.interpreter;

public class Or extends Expression
{
    /**
     * @link aggregation 
     */
    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() + ")";
    }
}