dev 契约锁

P15GEN2\59518

2024-05-29 d4210c7c4b04abde20037ea8aa0f54ef8a2649aa

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package foundation.version;
 
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
 
import foundation.dao.IFileReader;
import foundation.json.JObjectReader;
 
public class VersionedFileReader implements IFileReader {
 
    private VersionIndex index;
    
 
    public VersionedFileReader(VersionIndex index) {
        this.index = index;
    }
 
    @Override
    public JObjectReader getJSONObjectReader() throws Exception {
        String path = index.getPath();
        File file = new File(path);
        
        if (!file.exists()) {
            return new JObjectReader();
        }
        
        StringBuilder body = new StringBuilder();
        
        FileInputStream inputStream = new FileInputStream(file);
        try {
            BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, "utf-8"));
            try {
                String line;
                while ((line = reader.readLine()) != null) {
                    body.append(line);
                }
            }
            finally {
                reader.close();
            }
        }
        finally {
            try {
                inputStream.close();
            } catch (IOException e) {
            }
        }
        
        String content = body.toString();
        JObjectReader result = new JObjectReader(content);
        
        return result;
    }
 
}