2 * ============LICENSE_START=======================================================
3 * Copyright (C) 2016-2018 Ericsson. All rights reserved.
4 * ================================================================================
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
17 * SPDX-License-Identifier: Apache-2.0
18 * ============LICENSE_END=========================================================
21 package org.onap.policy.apex.service.engine.event.impl.filecarrierplugin.consumer;
23 import java.io.IOException;
24 import java.io.InputStream;
25 import org.onap.policy.apex.service.parameters.eventprotocol.EventProtocolTextCharDelimitedParameters;
26 import org.slf4j.ext.XLogger;
27 import org.slf4j.ext.XLoggerFactory;
30 * The class CharacterDelimitedTextBlockReader reads the next block of text between two character
31 * tags from an input stream.
33 * @author Liam Fallon (liam.fallon@ericsson.com)
35 public class CharacterDelimitedTextBlockReader implements TextBlockReader {
36 // The logger for this class
37 private static final XLogger LOGGER = XLoggerFactory.getXLogger(CharacterDelimitedTextBlockReader.class);
40 private final char startTagChar;
41 private final char endTagChar;
43 // The input stream for text
44 private InputStream inputStream;
46 // Flag indicating we have seen EOF on the stream
47 private boolean eofOnInputStream = false;
50 * Constructor, set the delimiters.
52 * @param startTagChar The start tag for text blocks
53 * @param endTagChar The end tag for text blocks
55 public CharacterDelimitedTextBlockReader(final char startTagChar, final char endTagChar) {
56 this.startTagChar = startTagChar;
57 this.endTagChar = endTagChar;
61 * Constructor, set the delimiters from a character delimited event protocol parameter class.
63 * @param charDelimitedParameters the character delimited event protocol parameter class
65 public CharacterDelimitedTextBlockReader(final EventProtocolTextCharDelimitedParameters charDelimitedParameters) {
66 this.startTagChar = charDelimitedParameters.getStartChar();
67 this.endTagChar = charDelimitedParameters.getEndChar();
74 public void init(final InputStream incomingInputStream) {
75 this.inputStream = incomingInputStream;
82 public TextBlock readTextBlock() throws IOException {
83 // Check if there was a previous end of a text block with a non-empty text block returned
84 if (eofOnInputStream) {
85 return new TextBlock(eofOnInputStream, null);
88 // Read the block of text
89 final StringBuilder textBlockBuilder = readTextBlockText();
91 // Condition the text block and return it
92 final String textBlock = textBlockBuilder.toString().trim();
93 if (textBlock.length() > 0) {
94 return new TextBlock(eofOnInputStream, textBlock);
96 return new TextBlock(eofOnInputStream, null);
101 * Read a block of text.
102 * @return A string builder containing the text
103 * @throws IOException on read errors
105 private StringBuilder readTextBlockText() throws IOException {
106 // Holder for the text block
107 final StringBuilder textBlockBuilder = new StringBuilder();
109 int nestingLevel = 0;
111 // Read the next text block
113 final char nextChar = (char) inputStream.read();
116 if (nextChar == (char) -1) {
117 eofOnInputStream = true;
118 return textBlockBuilder;
121 if (nextChar == startTagChar) {
123 } else if (nestingLevel == 0 && !Character.isWhitespace(nextChar)) {
124 LOGGER.warn("invalid input on consumer: {}", nextChar);
128 textBlockBuilder.append(nextChar);
130 // Check for end of the text block, we have come back to level 0
131 if (nextChar == endTagChar) {
132 if (nestingLevel > 0) {
136 if (nestingLevel == 0) {
137 return textBlockBuilder;