example.groovy

class FilterCore {
    private String pattern
    private String map
    private DocObj mydoc
    boolean proc = false
    def FilterCore(String pattern,DocObj mydoc){
        this.pattern = pattern
        this.mydoc=mydoc
    }
    def tag(map){
        this.map = map
        return this
    }
    def save(){
        println pattern + ":"+map
    }
    
    def process(boolean autosave = false){
        if(!this.proc){
            println "実行"
            this.proc=true
            this.mydoc.proc(this)
            if(autosave)this.save()
            
            this.proc=false
        }
        
    }
}
interface DocObj {
    def filter(pattern)
    def proc(obj)
}

class Viewer implements DocObj {

    def filter(pattern){
        return new FilterCore(pattern,this)
    }
    def proc(obj){
        println "proc called:"+obj
    }
}

def view = new Viewer() 

view.filter("/パターン/").tag("{'name':'tyama'}").process(true)

view.filter("/パターン2/")
    .tag("{'name':'tyama2'}")
    .save()