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Dozer is a powerful Java Bean to Java Bean mapper that recursively copies data from one object to another
There is a newer version: 5.5.1
/*
 * Copyright 2005-2010 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 org.dozer.util;

import org.apache.commons.lang.builder.ReflectionToStringBuilder;
import org.apache.commons.lang.builder.ToStringStyle;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.dozer.fieldmap.FieldMap;

import java.util.Collection;

/**
 * Internal class used to build various types of log messages. Only intended for internal use.
 * 
 * @author tierney.matt
 * @author garsombke.franz
 */
public final class LogMsgFactory {

  private static final Log log = LogFactory.getLog(LogMsgFactory.class);

  private LogMsgFactory() {}

  public static String createFieldMappingErrorMsg(Object srcObj, FieldMap fieldMapping, Object srcFieldValue, Object destObj) {
    String srcClassName = null;
    if (srcObj != null) {
      srcClassName = srcObj.getClass().getName();
    }

    String srcValueType;
    String srcFieldValueString = null;
    if (srcFieldValue != null) {
      srcValueType = srcFieldValue.getClass().toString();
      //1797808 - If an error occurs calling src value toString(), eat the error and still log the dozer error msg
      try {
        srcFieldValueString = srcFieldValue.toString();
      } catch (Exception e) {
        log.error("An exception occurred invoking toString() on the source field value: " + srcFieldValue.getClass().getName()
            + "@" + Integer.toHexString(srcFieldValue.hashCode()), e);
        srcFieldValueString = "Unable to determine source field value";
      }
    } else {
      srcValueType = fieldMapping.getSrcFieldType();
    }

    String destClassName = null;
    if (destObj != null) {
      destClassName = destObj.getClass().getName();
    }

    String destFieldTypeName = null;
    try {
      if (destObj != null) {
        destFieldTypeName = fieldMapping.getDestFieldType(destObj.getClass()).getName();
      }
    } catch (Exception e) {
      log.warn("unable to determine dest field type when build log.error message");
    }

    return "Field mapping error -->" + "\n  MapId: " + fieldMapping.getMapId() + "\n  Type: " + fieldMapping.getType()
        + "\n  Source parent class: " + srcClassName + "\n  Source field name: " + fieldMapping.getSrcFieldName()
        + "\n  Source field type: " + srcValueType + "\n  Source field value: " + srcFieldValueString + "\n  Dest parent class: "
        + destClassName + "\n  Dest field name: " + fieldMapping.getDestFieldName() + "\n  Dest field type: " + destFieldTypeName;
  }

  public static String createFieldMappingSuccessMsg(Class srcClass, Class destClass, String srcFieldName, String destFieldName,
      Object srcFieldValue, Object destFieldValue, String classMapId) {
    String srcClassStr = MappingUtils.getClassNameWithoutPackage(srcClass);
    String destClassStr = MappingUtils.getClassNameWithoutPackage(destClass);

    return "MAPPED: " + srcClassStr + "." + srcFieldName + " --> " + destClassStr + "." + destFieldName + "    VALUES: "
        + getLogOutput(srcFieldValue) + " --> " + getLogOutput(destFieldValue) + "    MAPID: "
        + (classMapId != null ? classMapId : "");
  }

  private static String getLogOutput(Object object) {
    String output = "NULL";
    if (object == null) {
      return output;
    }
    try {
      if (object.getClass().isArray() || Collection.class.isAssignableFrom(object.getClass())) {
        output = ReflectionToStringBuilder.toString(object, ToStringStyle.MULTI_LINE_STYLE);
      } else {
        output = object.toString();
      }
    } catch (RuntimeException e) {
      output = object.toString();
    }
    return output;
  }

}