cf.client.UnexpectedResponseException.java Source code

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Here is the source code for cf.client.UnexpectedResponseException.java

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/*
 *   Copyright (c) 2013 Intellectual Reserve, Inc.  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.
 *
 */
package cf.client;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.StatusLine;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;

/**
 * @author Mike Heath <elcapo@gmail.com>
 */
public class UnexpectedResponseException extends RuntimeException {
    public UnexpectedResponseException(HttpResponse response) {
        super(buildMessage(response));
    }

    private static String buildMessage(HttpResponse response) {
        final StatusLine statusLine = response.getStatusLine();
        final String reasonPhrase = statusLine.getReasonPhrase();
        final String body = readResponseBody(response);

        final StringBuilder builder = new StringBuilder();
        builder.append("Unexpected response code ").append(statusLine.getStatusCode());
        if (reasonPhrase != null && reasonPhrase.trim().length() > 0) {
            builder.append(' ').append(reasonPhrase);
        }

        if (body != null && body.trim().length() > 0) {
            builder.append(" response body:").append(body);
        }
        return builder.toString();
    }

    private static String readResponseBody(HttpResponse response) {
        final HttpEntity entity = response.getEntity();
        if (entity == null) {
            return null;
        }
        final ByteArrayOutputStream out = new ByteArrayOutputStream();
        byte[] buffer = new byte[4096];
        try (InputStream in = entity.getContent()) {
            while (true) {
                int size = in.read(buffer, 0, buffer.length);
                if (size < 0) {
                    break;
                }
                out.write(buffer, 0, size);
            }
        } catch (IOException e) {
            // If we get an error trying to read the body, just swallow it and return null.
            return null;
        }
        return new String(out.toByteArray());
    }

}