library/src/main/java/org/apache/apex/malhar/lib/util/FieldInfo.java

/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.apex.malhar.lib.util;

import javax.validation.constraints.NotNull;

import org.apache.commons.lang3.ClassUtils;

@SuppressWarnings("rawtypes")
/**
 * @since 3.3.0
 */
public class FieldInfo
{
  // Columns name set by user.
  @NotNull
  private String columnName;

  // Expressions set by user to get field values from input tuple.
  @NotNull
  private String pojoFieldExpression;

  private SupportType type;

  public FieldInfo()
  {
  }

  public FieldInfo(String columnName, String pojoFieldExpression, SupportType type)
  {
    setColumnName(columnName);
    setPojoFieldExpression(pojoFieldExpression);
    setType(type);
  }

  /**
   * the column name which keep this field.
   * @since 3.0.0
 */
  public String getColumnName()
  {
    return columnName;
  }

  public void setColumnName(String columnName)
  {
    this.columnName = columnName;
  }

  /**
   * Java expressions that will generate the column value from the POJO.
   *
   */
  public String getPojoFieldExpression()
  {
    return pojoFieldExpression;
  }

  /**
   * Java expressions that will generate the column value from the POJO.
   *
   */
  public void setPojoFieldExpression(String expression)
  {
    this.pojoFieldExpression = expression;
  }

  /**
   * the columnName should not duplicate( case-insensitive )
   */
  @Override
  public int hashCode()
  {
    return columnName.toLowerCase().hashCode();
  }

  @Override
  public boolean equals(Object obj)
  {
    if (obj == null || !(obj instanceof FieldInfo)) {
      return false;
    }
    return columnName.equalsIgnoreCase(((FieldInfo)obj).getColumnName());
  }

  /**
   * the Java type of the column
   */
  public SupportType getType()
  {
    return type;
  }

  /**
   * the Java type of the column
   * @omitFromUI
   */
  public void setType(SupportType type)
  {
    this.type = type;
  }

  public static enum SupportType
  {
    BOOLEAN(Boolean.class), SHORT(Short.class), INTEGER(Integer.class), LONG(Long.class),
    FLOAT(Float.class), DOUBLE(Double.class), STRING(String.class), OBJECT(Object.class);

    private Class javaType;

    private SupportType(Class javaType)
    {
      this.javaType = javaType;
    }

    public Class getJavaType()
    {
      return javaType;
    }

    public static SupportType getFromJavaType(Class type)
    {
      for (SupportType supportType : SupportType.values()) {
        if (supportType.getJavaType() == ClassUtils.primitiveToWrapper(type)) {
          return supportType;
        }
      }

      return OBJECT;
    }
  }

}