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/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2016-2018 Ericsson. All rights reserved.
* ================================================================================
* Licensed 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.
*
* SPDX-License-Identifier: Apache-2.0
* ============LICENSE_END=========================================================
*/
package org.onap.policy.apex.service.engine.event.impl.filecarrierplugin.consumer;
import java.io.IOException;
import java.io.InputStream;
import org.onap.policy.apex.service.parameters.eventprotocol.EventProtocolTextCharDelimitedParameters;
import org.slf4j.ext.XLogger;
import org.slf4j.ext.XLoggerFactory;
/**
* The class CharacterDelimitedTextBlockReader reads the next block of text between two character
* tags from an input stream.
*
* @author Liam Fallon (liam.fallon@ericsson.com)
*/
public class CharacterDelimitedTextBlockReader implements TextBlockReader {
// The logger for this class
private static final XLogger LOGGER = XLoggerFactory.getXLogger(CharacterDelimitedTextBlockReader.class);
// The character tags
private final char startTagChar;
private final char endTagChar;
// The input stream for text
private InputStream inputStream;
// Flag indicating we have seen EOF on the stream
private boolean eofOnInputStream = false;
/**
* Constructor, set the delimiters.
*
* @param startTagChar The start tag for text blocks
* @param endTagChar The end tag for text blocks
*/
public CharacterDelimitedTextBlockReader(final char startTagChar, final char endTagChar) {
this.startTagChar = startTagChar;
this.endTagChar = endTagChar;
}
/**
* Constructor, set the delimiters from a character delimited event protocol parameter class.
*
* @param charDelimitedParameters the character delimited event protocol parameter class
*/
public CharacterDelimitedTextBlockReader(final EventProtocolTextCharDelimitedParameters charDelimitedParameters) {
this.startTagChar = charDelimitedParameters.getStartChar();
this.endTagChar = charDelimitedParameters.getEndChar();
}
/*
* (non-Javadoc)
*
* @see
* org.onap.policy.apex.service.engine.event.impl.filecarrierplugin.consumer.TextBlockReader#init(
* java.io.InputStream)
*/
@Override
public void init(final InputStream incomingInputStream) {
this.inputStream = incomingInputStream;
}
/*
* (non-Javadoc)
*
* @see org.onap.policy.apex.service.engine.event.impl.filecarrierplugin.consumer.TextBlockReader#
* readTextBlock()
*/
@Override
public TextBlock readTextBlock() throws IOException {
// Check if there was a previous end of a text block with a non-empty text block returned
if (eofOnInputStream) {
return new TextBlock(eofOnInputStream, null);
}
// Read the block of text
final StringBuilder textBlockBuilder = readTextBlockText();
// Condition the text block and return it
final String textBlock = textBlockBuilder.toString().trim();
if (textBlock.length() > 0) {
return new TextBlock(eofOnInputStream, textBlock);
} else {
return new TextBlock(eofOnInputStream, null);
}
}
/**
* Read a block of text.
* @return A string builder containing the text
* @throws IOException on read errors
*/
private StringBuilder readTextBlockText() throws IOException {
// Holder for the text block
final StringBuilder textBlockBuilder = new StringBuilder();
int nestingLevel = 0;
// Read the next text block
while (true) {
final char nextChar = (char) inputStream.read();
// Check for EOF
if (nextChar == (char) -1) {
eofOnInputStream = true;
return textBlockBuilder;
}
if (nextChar == startTagChar) {
nestingLevel++;
} else if (nestingLevel == 0 && !Character.isWhitespace(nextChar)) {
LOGGER.warn("invalid input on consumer: {}", nextChar);
continue;
}
textBlockBuilder.append(nextChar);
// Check for end of the text block, we have come back to level 0
if (nextChar == endTagChar) {
if (nestingLevel > 0) {
nestingLevel--;
}
if (nestingLevel == 0) {
return textBlockBuilder;
}
}
}
}
}
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