www.pudn.com > apriori算法的java代码.rar > GetSource.java

//File Interface 
//Get data source from a file  
import java.io.*; 
import java.lang.*; 
 
public class GetSource{ 
	 
	//Data 
	static byte[] t = {'t','r','u','e'}; 
	static byte[] f = {'f','a','l','s','e'}; 
	FileInputStream file ; //source file 
	FastVector vector ; //goal container 
	String fName ; //store source file name 
	Item item ; 
	 
	//Methods 
	public GetSource(String filename) throws FileNotFoundException{ 
		file  = new FileInputStream(filename) ; 
		fName = filename ; 
	} 
	 
	public void Reset() throws IOException,FileNotFoundException{ //reload source file 
		file.close(); 
		file = new FileInputStream(fName) ; 
	} 
	 
	public int NumOfSets() throws IOException,FileNotFoundException{ //return the number of sets 
		int num = 0 ; int data = 0; 
		Reset(); 
		 
		while(data != '%'){ 
			data = file.read(); 
			if(data == 13) 
				num ++; 
		} 
		Reset();		 
		return num ; 
	} 
	 
	public FastVector ReadSet() throws IOException,FileNotFoundException{ //Get and return the current set 
		int data = -2; //nonsence 
		FastVector vector = new FastVector(); 
		byte[] b = new byte[30] ; int pos = 0 ; int item = 0 ; 
		 
		while(data != 13){ 
			if(data == ',') 
			{ 
				item ++ ; 
				data = file.read(); 
				if(data == 't') 
				{ 
					vector.addElement(new Item(item + 'A')); 
				} 
				if(data == 'f') 
				{ 
		 			vector.addElement(new Item(item + 'a')); 
				} 
			} 
			data = file.read(); 
			 
		} 
		return vector ; 
	} 
	 
	public FastVector GetSet(int k) throws IOException{ //get the kth set,return it as a vector 
		int n=0;                                         //begin from 0 
		int data=0;  
		FastVector vector = new FastVector(); 
		Reset(); 
		while(!(n == k)){ //locate the kth set 
			data = file.read(); 
			if(data == 13) //end of last set 
				n++ ;			 
		} 
		while(data != 10){ //read until '@' 
			data = file.read();						 
		} 
		 
		//then the asked set started	 
		vector = ReadSet(); 	 
		return vector ;	 
	} 
	 
	public FastVector GetAll() throws IOException{ //return a vector including all sets 
		int n = NumOfSets(); 
		int i = 0; 
		FastVector vector = new FastVector(); 
		for(i=0;i