| /* |
| * 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.nifi.processors.kafka; |
| |
| import java.io.BufferedInputStream; |
| import java.io.InputStream; |
| import java.util.Arrays; |
| |
| import org.apache.nifi.stream.io.ByteArrayOutputStream; |
| import org.apache.nifi.stream.io.util.NonThreadSafeCircularBuffer; |
| |
| /** |
| * |
| */ |
| class StreamScanner { |
| |
| private final InputStream is; |
| |
| private final byte[] delimiter; |
| |
| private final NonThreadSafeCircularBuffer buffer; |
| |
| private final ByteArrayOutputStream baos; |
| |
| private byte[] data; |
| |
| private boolean eos; |
| |
| /** |
| * |
| */ |
| StreamScanner(InputStream is, String delimiter) { |
| this.is = new BufferedInputStream(is); |
| this.delimiter = delimiter.getBytes(); |
| buffer = new NonThreadSafeCircularBuffer(this.delimiter); |
| baos = new ByteArrayOutputStream(); |
| } |
| |
| /** |
| * |
| */ |
| boolean hasNext() { |
| this.data = null; |
| if (!this.eos) { |
| try { |
| boolean keepReading = true; |
| while (keepReading) { |
| byte b = (byte) this.is.read(); |
| if (b > -1) { |
| baos.write(b); |
| if (buffer.addAndCompare(b)) { |
| this.data = Arrays.copyOfRange(baos.getUnderlyingBuffer(), 0, baos.size() - delimiter.length); |
| keepReading = false; |
| } |
| } else { |
| this.data = baos.toByteArray(); |
| keepReading = false; |
| this.eos = true; |
| } |
| } |
| baos.reset(); |
| } catch (Exception e) { |
| throw new IllegalStateException("Failed while reading InputStream", e); |
| } |
| } |
| return this.data != null; |
| } |
| |
| /** |
| * |
| */ |
| byte[] next() { |
| return this.data; |
| } |
| |
| void close() { |
| this.baos.close(); |
| } |
| } |