适配器设计模式

package interfaces.filter;


public class BandPass extends Filter {
double lowCutoff,highCutoff;
public BandPass(double lowCut,double highCut){
lowCutoff = lowCut;
highCutoff =highCut;
}
public Waveform process(Waveform input){return input;}
}

/////////////////////////////////////////////////////////////////////

package interfaces.filter;






public class Filter {
public String name(){
return getClass().getSimpleName();
}
public Waveform process(Waveform input){
return input;
}
}

///////////////////////////////////////////////////////////////////////

package interfaces.filter;


public class HighPass extends Filter {
double cutoff;
public HighPass(double cutoff){
this.cutoff=cutoff;
}
public Waveform process(Waveform input){
return input;
}
}

/////////////////////////////////////////////////////////////////////

package interfaces.filter;


public class LowPass extends Filter {


double cutoff;
public LowPass(double cutoff){
this.cutoff=cutoff;
}
public Waveform process(Waveform input){
return input;
}
}

/////////////////////////////////////////////////////////////////////

package interfaces.filter;


public class Waveform {


private static long counter;
private final long id = counter++;
public String toString(){
return "Waveform"+id;
}
}

/////////////////////////////////////////////////////////////////////////////

package interfaces.interfaceprocessor;


public interface Processor {
String name();
Object process(Object input);
}

//////////////////////////////////////////////////////////////////////////////

package interfaces.interfaceprocessor;

import interfaces.filter.BandPass;
import interfaces.filter.Filter;
import interfaces.filter.HighPass;
import interfaces.filter.LowPass;
import interfaces.filter.Waveform;


/**
 * 适配器设计模式
 * 在这种使用适配器的方式中，FilterAdapter的构造器接受你所拥有的接口Filter,然后生成
 * 具有你所需要的Processor接口的对象。
 * 将接口从具体实现中解耦使得接口可以应用于多种不同的具体实现，因此代码也就更具有可复用性。
 * */
class FileterAdapter implements Processor {
Filter filter;
    public FileterAdapter(Filter filter) {
this.filter  = filter;
// TODO Auto-generated constructor stub
}

@Override
public String name() {
// TODO Auto-generated method stub
return filter.name();
}


@Override
public Waveform process(Object input) {
// TODO Auto-generated method stub
return filter.process((Waveform)input);
}


}


class Apply{
public static void process(Processor p,Object s){
System.out.println("Using Processor"+p.name());
System.out.println(p.process(s));
}
public static String s =
"Disagreement with beliefs is by definition incorrect";
}
public class FilterProcessor {
public static void main(String[] args){
Waveform w = new Waveform();
Apply.process(new FileterAdapter(new LowPass(1.0)), w);
Apply.process(new FileterAdapter(new HighPass(2.0)), w);
Apply.process(new FileterAdapter(new BandPass(3.0, 4.0)), w);

}
}