me.geso.avans.jackson.JacksonJsonParamReader Maven / Gradle / Ivy
package me.geso.avans.jackson;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.StandardCharsets;
import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import me.geso.avans.JSONParamReader;
public interface JacksonJsonParamReader extends JSONParamReader {
/**
* If you want to customize this behavior, you can copy and paste this code
* into your code.
*/
@Override
public default Object readJsonParam(InputStream is, Class valueType)
throws IOException {
final ObjectMapper mapper = new ObjectMapper();
// Ignore unknown properties.
mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES,
false);
// Read bytes into byte array.
// It needs for better logging, error introspection.
final ByteArrayOutputStream output = new ByteArrayOutputStream();
final byte[] buffer = new byte[1024 * 4];
int n;
while (-1 != (n = is.read(buffer))) {
output.write(buffer, 0, n);
}
final byte[] byteArray = output.toByteArray();
try {
return mapper.readValue(byteArray, valueType);
} catch (JsonParseException | JsonMappingException e) {
final String json = new String(byteArray,
StandardCharsets.UTF_8);
final Throwable cause = e.getCause();
final String message = ((cause != null ? cause.getMessage()
: e.getMessage())
+ " : " + json);
throw new IOException(message, e);
}
}
}