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    1   /*
    2    * Copyright 2004-2009 the Seasar Foundation and the Others.
    3    *
    4    * Licensed under the Apache License, Version 2.0 (the "License");
    5    * you may not use this file except in compliance with the License.
    6    * You may obtain a copy of the License at
    7    *
    8    *     http://www.apache.org/licenses/LICENSE-2.0
    9    *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
    13   * either express or implied. See the License for the specific language
    14   * governing permissions and limitations under the License.
    15   */
    16  package org.seasar.cubby.converter.impl;
    17
    18  import org.apache.commons.fileupload.FileItem;
    19  import org.seasar.cubby.converter.ConversionHelper;
    20
    21  /**
    22   * {@link FileItem}を他の型のオブジェクトに変換するクラスの抽象クラスです。
    23   *
    24   * @author baba
    25   */
    26  public abstract class AbstractFileItemConverter extends AbstractConverter {
    27
    28  	/**
    29  	 * {@inheritDoc}
    30  	 */
    31  	@Override
    32  	public boolean canConvert(final Class<?> parameterType,
    33  			final Class<?> objectType) {
    34  		if (parameterType == null) {
    35  			return false;
    36  		}
    37  		if (!FileItem.class.isAssignableFrom(parameterType)) {
    38  			return false;
    39  		}
    40  		return super.canConvert(parameterType, objectType);
    41  	}
    42
    43  	/**
    44  	 * {@inheritDoc}
    45  	 */
    46  	public Object convertToObject(final Object value,
    47  			final Class<?> objectType, final ConversionHelper helper) {
    48  		if (value == null) {
    49  			return null;
    50  		}
    51  		final FileItem fileItem = (FileItem) value;
    52  		return convert(fileItem);
    53  	}
    54
    55  	/**
    56  	 * {@inheritDoc}
    57  	 */
    58  	public String convertToString(final Object value,
    59  			final ConversionHelper helper) {
    60  		return null;
    61  	}
    62
    63  	/**
    64  	 * {@link FileItem} を特定の型に変換します。
    65  	 *
    66  	 * @param fileItem
    67  	 *            変換元のインスタンス
    68  	 * @return <code>fileItem</code>を変換したインスタンス
    69  	 */
    70  	protected abstract Object convert(final FileItem fileItem);
    71
    72  }