com.sap.cloud.mt.subscription.StreamToJsonConverter Maven / Gradle / Ivy

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/*******************************************************************************
 *   © 2019-2024 SAP SE or an SAP affiliate company. All rights reserved.
 ******************************************************************************/
package com.sap.cloud.mt.subscription;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.nio.charset.Charset;

public class StreamToJsonConverter {
	private static final Logger logger = LoggerFactory.getLogger(StreamToJsonConverter.class);
	private final Class clazz;

	public StreamToJsonConverter(Class clazz) {
		this.clazz = clazz;
	}

	public T asJson(InputStream inputStream, Charset charset) throws IOException {
		try (InputStreamReader inputStreamReader = new InputStreamReader(inputStream, charset);
			 BufferedReader bufferedReader = new BufferedReader(inputStreamReader)) {
			if (clazz == String.class) {
				return (T) asString(bufferedReader);
			} else {
				try {
					return Tools.getObjectMapper().readValue(bufferedReader, clazz);
				} catch (IOException e) {
					logger.error("Could not convert return value to class {}, message is {}", clazz, e);
					return null;
				}
			}
		}
	}

	private String asString(BufferedReader bufferedReader) throws IOException {
		StringBuilder builder = new StringBuilder();
		String line;
		while ((line = bufferedReader.readLine()) != null) builder.append(line);
		return builder.toString();
	}

	public T asJson(String input) throws IOException {
		if (clazz == String.class) {
			return (T) input;
		} else {
			try {
				return Tools.getObjectMapper().readValue(input, clazz);
			} catch (IOException e) {
				logger.error("Could not convert return value to class {}, message is {}", clazz, e);
				return null;
			}
		}
	}
}