24——规格模式（新）

它是组合模式的一种特殊应用

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1.类图

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2.代码

/**
* 抽象规格书
*/

public interface ISpecification {
    //候选者是否满足要求
    public boolean isSatisfiedBy(Object candidate);
    //and操作
    public ISpecification and(ISpecification spec);
    //or操作
    public ISpecification or(ISpecification spec);
    //not操作
    public ISpecification not();
}

/**
* 组合规格书
*/

public abstract class CompositeSpecification implements ISpecification {
    //是否满足条件由实现类实现
    public abstract boolean isSatisfiedBy(Object candidate);
    //and操作
    public ISpecification and(ISpecification spec) {
        return new AndSpecification(this,spec);
    }
    //not操作
    public ISpecification not() {
        return new NotSpecification(this);
    }
    //or操作
    public ISpecification or(ISpecification spec) {
        return new OrSpecification(this,spec);
    }
}

/**
* 与规格书
*/

public class AndSpecification extends CompositeSpecification {
    //传递两个规格书进行and操作
    private ISpecification left;
    private ISpecification right;
    public AndSpecification(ISpecification _left,ISpecification _right){
        this.left = _left;
        this.right = _right;
    }
    //进行and运算
    @Override
    public boolean isSatisfiedBy(Object candidate) {
        return left.isSatisfiedBy(candidate) && right.isSatisfiedBy(candidate);
    }
}

/**
* 或规格书
*/

public class OrSpecification extends CompositeSpecification {
    //左右两个规格书
    private ISpecification left;
    private ISpecification right;
    public OrSpecification(ISpecification _left,ISpecification _right){
        this.left = _left;
        this.right = _right;
    }
    //or运算
    @Override
    public boolean isSatisfiedBy(Object candidate) {
        return left.isSatisfiedBy(candidate) || right.isSatisfiedBy(candidate);
    }
}

/**
* 非规格书
*/

public class NotSpecification extends CompositeSpecification {
    //传递一个规格书
    private ISpecification spec;
    public NotSpecification(ISpecification _spec){
        this.spec = _spec;
    }
    //not操作
    @Override
    public boolean isSatisfiedBy(Object candidate) {
        return !spec.isSatisfiedBy(candidate);
    }
}

/**
* 业务规格书
*/

public class BizSpecification extends CompositeSpecification {
    //基准对象
    private Object obj;
    public BizSpecification(Object _obj){
        this.obj = _obj;
    }
    @Override
    public boolean isSatisfiedBy(Object candidate) {
        //根据基准对象和候选对象，进行业务判断，返回boolean
        return false;
    }
}

/**
* 场景类
*/

public class Client {
    public static void main(String[] args) {
        //待分析的对象
        ArrayList