Android Open Source - storm-gen Type Converter

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The source code is released under:

Apache License

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Java Source Code

/*******************************************************************************
 * Copyright 2012 Google, Inc.//from  w w w .ja va 2s.  com
 *
 * 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 com.turbomanage.storm.types;

import android.content.ContentValues;
import android.database.Cursor;

/**
 * Base class that converts a Java type to one of the four valid
 * SQLite representations. To write a custom converter, extend
 * this class and annotate it with @Convert. Besides the abstract
 * methods, each concrete TypeConverter class must also have a
 * static field named GET that is used by generated code to obtain
 * an instance of the converter. See {@link BooleanConverter} for
 * an example.
 *
 * @author David M. Chandler
 *
 * @param <J> native Java type
 * @param <S> SQL type (Integer, Double, String, or byte[])
 */
public abstract class TypeConverter<J extends Object, S extends Object> {

  /**
   * Enum representing the four fundamental types in SQLite.
   */
  public enum SqlType {INTEGER, REAL, BLOB, TEXT};

  /**
   * Enum representing the types for which there are corresponding methods
   * {@link Cursor} and bind methods. Never called at runtime.
   *
   * @author David M. Chandler
   */
  public enum BindType {BLOB, DOUBLE, FLOAT, INT, LONG, SHORT, STRING}

  /**
   * Convert a Java value to a representation that can
   * be put into a {@link ContentValues} map.
   *
   * @param javaValue
   * @return
   */
  public abstract S toSql(J javaValue);

  /**
   * Convert a value obtained from the {@link Cursor} getS method
   * to its Java type.
   *
   * @param sqlValue
   * @return
   */
  public abstract J fromSql(S sqlValue);

  /**
   * Convert a value from a String to its {@link SqlType}.
   * This method is used by the CSV importer.
   *
   * @param strValue
   * @return
   */
  public abstract S fromString(String strValue);

  /**
   * Convert a value from its SQL type to a String. This
   * method is used by the CSV exporter.
   *
   * @param sqlValue
   * @return
   */
  public String toString(S sqlValue) {
    return (sqlValue == null) ? null : sqlValue.toString();
  }

}

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