| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.hadoop.record; |
| |
| import java.io.InputStreamReader; |
| import java.io.InputStream; |
| import java.io.IOException; |
| import java.io.PushbackReader; |
| import java.io.UnsupportedEncodingException; |
| |
| /** |
| */ |
| public class CsvRecordInput implements RecordInput { |
| |
| private PushbackReader stream; |
| |
| private class CsvIndex implements Index { |
| public boolean done() { |
| char c = '\0'; |
| try { |
| c = (char) stream.read(); |
| stream.unread(c); |
| } catch (IOException ex) { |
| } |
| return (c == '}') ? true : false; |
| } |
| public void incr() {} |
| } |
| |
| private void throwExceptionOnError(String tag) throws IOException { |
| throw new IOException("Error deserializing "+tag); |
| } |
| |
| private String readField(String tag) throws IOException { |
| try { |
| StringBuffer buf = new StringBuffer(); |
| while (true) { |
| char c = (char) stream.read(); |
| switch (c) { |
| case ',': |
| return buf.toString(); |
| case '}': |
| case '\n': |
| case '\r': |
| stream.unread(c); |
| return buf.toString(); |
| default: |
| buf.append(c); |
| } |
| } |
| } catch (IOException ex) { |
| throw new IOException("Error reading "+tag); |
| } |
| } |
| |
| /** Creates a new instance of CsvRecordInput */ |
| public CsvRecordInput(InputStream in) { |
| try { |
| stream = new PushbackReader(new InputStreamReader(in, "UTF-8")); |
| } catch (UnsupportedEncodingException ex) { |
| throw new RuntimeException(ex); |
| } |
| } |
| |
| public byte readByte(String tag) throws IOException { |
| return (byte) readLong(tag); |
| } |
| |
| public boolean readBool(String tag) throws IOException { |
| String sval = readField(tag); |
| return "T".equals(sval) ? true : false; |
| } |
| |
| public int readInt(String tag) throws IOException { |
| return (int) readLong(tag); |
| } |
| |
| public long readLong(String tag) throws IOException { |
| String sval = readField(tag); |
| try { |
| long lval = Long.parseLong(sval); |
| return lval; |
| } catch (NumberFormatException ex) { |
| throw new IOException("Error deserializing "+tag); |
| } |
| } |
| |
| public float readFloat(String tag) throws IOException { |
| return (float) readDouble(tag); |
| } |
| |
| public double readDouble(String tag) throws IOException { |
| String sval = readField(tag); |
| try { |
| double dval = Double.parseDouble(sval); |
| return dval; |
| } catch (NumberFormatException ex) { |
| throw new IOException("Error deserializing "+tag); |
| } |
| } |
| |
| public String readString(String tag) throws IOException { |
| String sval = readField(tag); |
| return Utils.fromCSVString(sval); |
| } |
| |
| public Buffer readBuffer(String tag) throws IOException { |
| String sval = readField(tag); |
| return Utils.fromCSVBuffer(sval); |
| } |
| |
| public void startRecord(String tag) throws IOException { |
| if (tag != null && !"".equals(tag)) { |
| char c1 = (char) stream.read(); |
| char c2 = (char) stream.read(); |
| if (c1 != 's' || c2 != '{') { |
| throw new IOException("Error deserializing "+tag); |
| } |
| } |
| } |
| |
| public void endRecord(String tag) throws IOException { |
| char c = (char) stream.read(); |
| if (tag == null || "".equals(tag)) { |
| if (c != '\n' && c != '\r') { |
| throw new IOException("Error deserializing record."); |
| } else { |
| return; |
| } |
| } |
| |
| if (c != '}') { |
| throw new IOException("Error deserializing "+tag); |
| } |
| c = (char) stream.read(); |
| if (c != ',') { |
| stream.unread(c); |
| } |
| |
| return; |
| } |
| |
| public Index startVector(String tag) throws IOException { |
| char c1 = (char) stream.read(); |
| char c2 = (char) stream.read(); |
| if (c1 != 'v' || c2 != '{') { |
| throw new IOException("Error deserializing "+tag); |
| } |
| return new CsvIndex(); |
| } |
| |
| public void endVector(String tag) throws IOException { |
| char c = (char) stream.read(); |
| if (c != '}') { |
| throw new IOException("Error deserializing "+tag); |
| } |
| c = (char) stream.read(); |
| if (c != ',') { |
| stream.unread(c); |
| } |
| return; |
| } |
| |
| public Index startMap(String tag) throws IOException { |
| char c1 = (char) stream.read(); |
| char c2 = (char) stream.read(); |
| if (c1 != 'm' || c2 != '{') { |
| throw new IOException("Error deserializing "+tag); |
| } |
| return new CsvIndex(); |
| } |
| |
| public void endMap(String tag) throws IOException { |
| char c = (char) stream.read(); |
| if (c != '}') { |
| throw new IOException("Error deserializing "+tag); |
| } |
| c = (char) stream.read(); |
| if (c != ',') { |
| stream.unread(c); |
| } |
| return; |
| } |
| } |