SqlParameterSourceUtils.java :  » J2EE » spring-framework-3.0.0 » org » springframework » jdbc » core » namedparam » Java Open Source

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spring framework 3.0.0 » org » springframework » jdbc » core » namedparam » SqlParameterSourceUtils.java
/*
 * Copyright 2002-2007 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.springframework.jdbc.core.namedparam;

import java.util.HashMap;
import java.util.Map;
import java.util.Iterator;

import org.springframework.jdbc.core.SqlParameterValue;

/**
 * Class that provides helper methods for the use of {@link SqlParameterSource}
 * with <code>SimpleJdbc</code> classes.
 *
 * @author Thomas Risberg
 * @since 2.5
 * @see org.springframework.jdbc.core.simple.SimpleJdbcTemplate
 */
public class SqlParameterSourceUtils {

  /**
   * Create an array of MapSqlParameterSource objects populated with data from the
   * values passed in. This will define what is included in a batch operation.
   * @param valueMaps array of Maps containing the values to be used
   * @return an array of SqlParameterSource
   */
  public static SqlParameterSource[] createBatch(Map[] valueMaps) {
    MapSqlParameterSource[] batch = new MapSqlParameterSource[valueMaps.length];
    for (int i = 0; i < valueMaps.length; i++) {
      Map valueMap = valueMaps[i];
      batch[i] = new MapSqlParameterSource(valueMap);
    }
    return batch;
  }

  /**
   * Create an array of BeanPropertySqlParameterSource objects populated with data
   * from the values passed in. This will define what is included in a batch operation.
   * @param beans object array of beans containing the values to be used
   * @return an array of SqlParameterSource
   */
  public static SqlParameterSource[] createBatch(Object[] beans) {
    BeanPropertySqlParameterSource[] batch = new BeanPropertySqlParameterSource[beans.length];
    for (int i = 0; i < beans.length; i++) {
      Object bean = beans[i];
      batch[i] = new BeanPropertySqlParameterSource(bean);
    }
    return batch;
  }

  /**
   * Create a wrapped value if parameter has type information, plain object if not.
   * @param source the source of paramer values and type information
   * @param parameterName the name of the parameter
   * @return the value object
   */
  public static Object getTypedValue(SqlParameterSource source, String parameterName) {
    int sqlType = source.getSqlType(parameterName);
    if (sqlType != SqlParameterSource.TYPE_UNKNOWN) {
      if (source.getTypeName(parameterName) != null) {
        return new SqlParameterValue(sqlType, source.getTypeName(parameterName), source.getValue(parameterName));
      }
      else {
        return new SqlParameterValue(sqlType, source.getValue(parameterName));
      }
    }
    else {
      return source.getValue(parameterName);
    }
  }

/**
 * Create a Map of case insensitive parameter names together with the original name.
 * @param parameterSource the source of paramer names
 * @return the Map that can be used for case insensitive matching of parameter names
 */
  public static Map extractCaseInsensitiveParameterNames(SqlParameterSource parameterSource) {
    Map caseInsensitiveParameterNames = new HashMap();
    if (parameterSource instanceof BeanPropertySqlParameterSource) {
      String[] propertyNames = ((BeanPropertySqlParameterSource)parameterSource).getReadablePropertyNames();
      for (int i = 0; i < propertyNames.length; i++) {
        String name = propertyNames[i];
        caseInsensitiveParameterNames.put(name.toLowerCase(), name);
      }
    }
    else if (parameterSource instanceof MapSqlParameterSource) {
      for (String name : ((MapSqlParameterSource) parameterSource).getValues().keySet()) {
        caseInsensitiveParameterNames.put(name.toLowerCase(), name);
      }
    }
    return caseInsensitiveParameterNames;
  }

}
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