de.codecentric.capturereplay.data.JsonDataMapper.java Source code

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Here is the source code for de.codecentric.capturereplay.data.JsonDataMapper.java

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/*
 * Copyright 2014 the original author or authors.
 *
 * 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 de.codecentric.capturereplay.data;

import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.MapperFeature;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.apache.commons.lang3.Validate;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.beans.factory.InitializingBean;

import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.lang.reflect.Method;

public class JsonDataMapper implements DataMapper, InitializingBean {

    private ObjectMapper objectMapper;

    private CaptureFileProvider captureFileProvider;

    public JsonDataMapper(CaptureFileProvider captureFileProvider) {
        setCaptureFileProvider(captureFileProvider);
    }

    @Override
    public void writeCapturedData(MethodSignature signature, Object returnValue, Object[] arguments)
            throws DataMappingException {
        Method method = signature.getMethod();
        String captureFileName = getCaptureFileName(method, arguments);
        try {
            File captureFile = captureFileProvider.getCaptureFile(captureFileName);
            enableTypeSupport();
            objectMapper.writeValue(captureFile,
                    new TypeWrapper(returnValue.getClass().getCanonicalName(), returnValue));
        } catch (Exception e) {
            throw new DataMappingException(String.format("Could not write test data to file %s.", captureFileName),
                    e);
        }
    }

    private void enableTypeSupport() {
        objectMapper.enableDefaultTypingAsProperty(ObjectMapper.DefaultTyping.NON_FINAL, "@class");
    }

    @Override
    public Object getCapturedData(String methodName, Object[] arguments) throws DataMappingException {
        String captureFileName = generateCaptureFileName(methodName, getArgumentHashCodes(arguments));
        try {
            enableTypeSupport();
            TypeWrapper typeWrapper = objectMapper.readValue(
                    new FileReader(captureFileProvider.getCaptureFile(captureFileName)), TypeWrapper.class);
            return objectMapper.convertValue(typeWrapper.getObject(),
                    objectMapper.getTypeFactory().constructFromCanonical(typeWrapper.getType()));
        } catch (IOException e) {
            throw new DataMappingException(String.format("Could not read from capture file %s.", captureFileName),
                    e);
        }
    }

    protected String getCaptureFileName(Method method, Object[] arguments) {
        return generateCaptureFileName(method.getName(), getArgumentHashCodes(arguments));
    }

    private long[] getArgumentHashCodes(Object[] arguments) {
        long[] argumentHashCodes = new long[arguments.length];
        for (int i = 0; i < arguments.length; i++) {
            if (arguments[i] == null) {
                argumentHashCodes[i] = 0;
            } else if (Enum.class.isAssignableFrom(arguments[i].getClass())) {
                argumentHashCodes[i] = arguments[i].toString().hashCode();
            } else {
                argumentHashCodes[i] = arguments[i].hashCode();
            }
        }
        return argumentHashCodes;
    }

    private String generateCaptureFileName(String methodName, long[] argumentHashCodes) {
        StringBuilder stringBuilder = new StringBuilder();
        stringBuilder.append(methodName);
        for (long argumentHashCode : argumentHashCodes) {
            stringBuilder.append("-").append(argumentHashCode);
        }
        return stringBuilder.toString();
    }

    @Override
    public void afterPropertiesSet() throws Exception {
        if (objectMapper == null) {
            objectMapper = createObjectMapper();
        }
        Validate.notNull(captureFileProvider, "The capture file provider must be set.");
    }

    private ObjectMapper createObjectMapper() {
        ObjectMapper objectMapper = new ObjectMapper();
        objectMapper.configure(MapperFeature.REQUIRE_SETTERS_FOR_GETTERS, true);
        objectMapper.configure(DeserializationFeature.ACCEPT_SINGLE_VALUE_AS_ARRAY, true);
        objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
        objectMapper.configure(DeserializationFeature.READ_ENUMS_USING_TO_STRING, true);
        return objectMapper;
    }

    public void setObjectMapper(ObjectMapper objectMapper) {
        Validate.notNull(captureFileProvider, "The object mapper must not be null.");
        this.objectMapper = objectMapper;
    }

    public void setCaptureFileProvider(CaptureFileProvider captureFileProvider) {
        Validate.notNull(captureFileProvider, "The capture file provider must not be null.");
        this.captureFileProvider = captureFileProvider;
    }
}