/**
* This file is part of FNLP (formerly FudanNLP).
*
* FNLP is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* FNLP is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with FudanNLP. If not, see <http://www.gnu.org/licenses/>.
*
* Copyright 2009-2014 www.fnlp.org. All rights reserved.
*/
package org.fnlp.data.reader;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import org.fnlp.ml.types.Instance;
import org.fnlp.ml.types.sv.HashSparseVector;
import org.fnlp.ml.types.sv.SparseVector;
/**
* @author xpqiu
* @version 1.0
* 简单文件格式如下： 类别 ＋ “空格” ＋ 数据 package
*
*/
public class svmFileReader extends Reader {
String content = null;
BufferedReader reader;
int type = 1;
public svmFileReader(String file) {
try {
File f = new File(file);
FileInputStream in = new FileInputStream(f);
reader = new BufferedReader(new InputStreamReader(in, "UTF-8"));
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/**
*
* @param file
* @param type （+1,-1,0）分别表示类标签在每行的（左，右，无）
*/
public svmFileReader(String file,int type) {
this(file);
this.type = 1;
}
public boolean hasNext() {
try {
content = reader.readLine();
if (content == null) {
reader.close();
return false;
}
} catch (IOException e) {
e.printStackTrace();
return false;
}
return true;
}
public Instance next() {
String[] tokens = content.split("\\t+|\\s+");
HashSparseVector sv = new HashSparseVector();
for (int i = 1; i < tokens.length; i++) {
String[] taken = tokens[i].split(":");
if (taken.length > 1) {
float value = Float.parseFloat(taken[1]);
int idx = Integer.parseInt(taken[0]);
sv.put(idx, value);
}
}
return new Instance(sv, tokens[0]);
}
}