Refactoring: moved all code concerned with error-handling in one package

[facebook-utils] / src / main / java / de / juplo / facebook / client / GraphApiErrorHandler.java

diff --git a/src/main/java/de/juplo/facebook/client/GraphApiErrorHandler.java b/src/main/java/de/juplo/facebook/client/GraphApiErrorHandler.java
deleted file mode 100644 (file)
index 6b1ab97..0000000
--- a/src/main/java/de/juplo/facebook/client/GraphApiErrorHandler.java
+++ /dev/null
@@ -1,140 +0,0 @@
-package de.juplo.facebook.client;
-
-import de.juplo.facebook.exceptions.GraphApiException;
-import java.io.ByteArrayInputStream;
-import java.io.IOException;
-import java.io.InputStream;
-import java.nio.charset.Charset;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-import org.springframework.http.HttpHeaders;
-import org.springframework.http.HttpStatus;
-import org.springframework.http.client.ClientHttpResponse;
-import org.springframework.util.FileCopyUtils;
-import org.springframework.web.client.ResponseErrorHandler;
-
-
-
-/**
- * Error-Handler for error-messages from the Facebook Graph-API.
- * <p>
- * This error-handler handels responses withe the HTTP-status code
- * {@code 400 BAD REQUEST}. It tries to extract and parse the error-message
- * from the HTTP-body. Successfully extracted and parsed messages are mapped
- * to a hierarchy of exceptions, that reflects the hierarchy of the error-
- * codes and -types.
- * <p>
- * If the HTTP-status-code of the response is not {@code 400 BAD REQUEST} or
- * the HTTP-body could not be extracted or parsed, this error-handler
- * delegates the handling to its parent.
- *
- * @see <a href="https://developers.facebook.com/docs/graph-api/using-graph-api/v2.5#errors">Graph-API Documentation</a>
- * @see <a href="http://fbdevwiki.com/wiki/Error_codes">Inofficial Wiki For Facebook-Developers</a>
- * @author Kai Moritz
- */
-public class GraphApiErrorHandler implements ResponseErrorHandler
-{
-  private final static Logger LOG =
-      LoggerFactory.getLogger(GraphApiErrorHandler.class);
-
-  private final ResponseErrorHandler parent;
-
-
-  public GraphApiErrorHandler(ResponseErrorHandler errorHandler)
-  {
-    this.parent = errorHandler;
-  }
-
-
-  @Override
-  public boolean hasError(ClientHttpResponse response) throws IOException
-  {
-    return
-        HttpStatus.Series.CLIENT_ERROR.equals(response.getStatusCode().series())
-        || this.parent.hasError(response);
-  }
-
-  @Override
-  public void handleError(final ClientHttpResponse response) throws IOException
-  {
-    if (!HttpStatus.BAD_REQUEST.equals(response.getStatusCode()))
-    {
-      // We will only handle 400 BAD REQUEST
-      LOG.debug("ignoring response with status-code {}.", response.getStatusCode());
-      parent.handleError(response);
-      return;
-    }
-
-
-    if (response.getBody() == null)
-    {
-      // There is no body to interpret in the HTTP-message
-      LOG.warn("Could not convert the response into an exception, because there is no message-body.");
-      parent.handleError(response);
-      return;
-    }
-
-    final byte[] body = FileCopyUtils.copyToByteArray(response.getBody());
-    GraphApiException error;
-
-    try
-    {
-      error = GraphApiException.create(body);
-      if (LOG.isInfoEnabled())
-        LOG.info("error-response: {}", new String(body, Charset.forName("UTF-8")));
-    }
-    catch (Exception e)
-    {
-      // The body of the HTTP-message could not be parsed.
-      // Let the parent error-handler try to handle the response.
-
-      LOG.warn("Could not convert the response into an exception, because the body is unparsable: {}", body);
-
-      // To do so, we have to wrap the original response to fill in
-      // the buffered body, if needed
-      ClientHttpResponse buffered = new ClientHttpResponse()
-      {
-        @Override
-        public HttpStatus getStatusCode() throws IOException
-        {
-          return response.getStatusCode();
-        }
-
-        @Override
-        public synchronized InputStream getBody() throws IOException
-        {
-          return new ByteArrayInputStream(body);
-        }
-
-        @Override
-        public HttpHeaders getHeaders()
-        {
-          return response.getHeaders();
-        }
-
-        @Override
-        public String getStatusText() throws IOException
-        {
-          return response.getStatusText();
-        }
-
-        @Override
-        public void close()
-        {
-          response.close();
-        }
-
-        @Override
-        public int getRawStatusCode() throws IOException
-        {
-          return response.getRawStatusCode();
-        }
-      };
-
-      parent.handleError(buffered);
-      return;
-    }
-
-    throw error;
-  }
-}