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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.InputStream;
import org.onap.policy.apex.service.engine.event.ApexEventException;
import org.onap.policy.apex.service.parameters.eventprotocol.EventProtocolParameters;
import org.onap.policy.apex.service.parameters.eventprotocol.EventProtocolTextCharDelimitedParameters;
import org.onap.policy.apex.service.parameters.eventprotocol.EventProtocolTextTokenDelimitedParameters;
import org.slf4j.ext.XLogger;
import org.slf4j.ext.XLoggerFactory;
/**
* This factory creates text block readers for breaking character streams into blocks of text.
*
* @author Liam Fallon (liam.fallon@ericsson.com)
*/
public class TextBlockReaderFactory {
// The logger for this class
private static final XLogger LOGGER = XLoggerFactory.getXLogger(TextBlockReaderFactory.class);
/**
* Get a text block reader for the given event protocol.
*
* @param inputStream the input stream that will be used for reading
* @param eventProtocolParameters the parameters that have been specified for event protocols
* @return the tagged reader
* @throws ApexEventException On an unsupported event protocol
*/
public TextBlockReader getTaggedReader(final InputStream inputStream,
final EventProtocolParameters eventProtocolParameters) throws ApexEventException {
// Check the type of event protocol we have
if (eventProtocolParameters instanceof EventProtocolTextCharDelimitedParameters) {
// We have character delimited textual input
final EventProtocolTextCharDelimitedParameters charDelimitedParameters =
(EventProtocolTextCharDelimitedParameters) eventProtocolParameters;
// Create the text block reader
final TextBlockReader characterDelimitedTextBlockReader =
new CharacterDelimitedTextBlockReader(charDelimitedParameters);
characterDelimitedTextBlockReader.init(inputStream);
return characterDelimitedTextBlockReader;
} else if (eventProtocolParameters instanceof EventProtocolTextTokenDelimitedParameters) {
// We have token delimited textual input
final EventProtocolTextTokenDelimitedParameters tokenDelimitedParameters =
(EventProtocolTextTokenDelimitedParameters) eventProtocolParameters;
// Create the text block reader
final HeaderDelimitedTextBlockReader headerDelimitedTextBlockReader =
new HeaderDelimitedTextBlockReader(tokenDelimitedParameters);
headerDelimitedTextBlockReader.init(inputStream);
return headerDelimitedTextBlockReader;
} else {
final String errorMessage =
"could not create text block reader for a textual event protocol, the required type "
+ eventProtocolParameters.getLabel() + " is not supported";
LOGGER.error(errorMessage);
throw new ApexEventException(errorMessage);
}
}
}
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