monasca.api.resource.exception.ErrorMessages.java Source code

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Here is the source code for monasca.api.resource.exception.ErrorMessages.java

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/*
 * Copyright (c) 2014,2016 Hewlett Packard Enterprise Development Company, L.P.
 * 
 * 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 monasca.api.resource.exception;

import static org.testng.Assert.assertEquals;
import static org.testng.Assert.assertTrue;

import javax.annotation.Nullable;

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;

/**
 * Error message utilities.
 */
public final class ErrorMessages {
    private static final ObjectMapper MAPPER = new ObjectMapper();

    public interface ErrorMessageMatcher {
        void matches(String faultType, int code, String messagePrefix);

        void matches(String faultType, int code, String messagePrefix, @Nullable String detailsPrefix);
    }

    public static ErrorMessageMatcher assertThat(final String errorMessage) {
        try {
            JsonNode node = MAPPER.readTree(errorMessage);
            final String rootKey = node.fieldNames().next();
            node = node.get(rootKey);
            final ErrorMessage message = MAPPER.reader(ErrorMessage.class).readValue(node);

            return new ErrorMessageMatcher() {
                @Override
                public void matches(String faultType, int code, String messagePrefix) {
                    matches(faultType, code, messagePrefix, null);
                }

                @Override
                public void matches(String faultType, int code, String messagePrefix,
                        @Nullable String detailsPrefix) {
                    assertEquals(rootKey, faultType);
                    assertEquals(message.code, code);
                    assertTrue(message.message.startsWith(messagePrefix),
                            String.format("String '%s' does not start with '%s'", message.message, messagePrefix));
                    if (detailsPrefix != null)
                        assertTrue(message.details.startsWith(detailsPrefix), message.details);
                }
            };

        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
}