final NumberConverter converter = new NumberConverter("##0");
        assertThat(converter.getAsObject("100"), is((Object) Long.valueOf("100")));
    }

    /**
     * @throws Exception
     */
    @Test
    public void testGetAsString() throws Exception {
        final NumberConverter converter = new NumberConverter("##0");
        assertThat(converter.getAsString(new Integer("100")), is("100"));
    }

 */
package org.codelibs.core.beans.converter;

import static org.codelibs.core.lang.StringUtil.isEmpty;
import static org.codelibs.core.misc.AssertionUtil.assertArgumentNotEmpty;
import static org.codelibs.core.misc.AssertionUtil.assertArgumentNotNull;

import java.util.Date;

import org.codelibs.core.beans.Converter;
import org.codelibs.core.convert.DateConversionUtil;

 * governing permissions and limitations under the License.
 */
package org.codelibs.core.beans.converter;

import static org.codelibs.core.misc.AssertionUtil.assertArgumentNotEmpty;
import static org.codelibs.core.misc.AssertionUtil.assertArgumentNotNull;

import java.util.Date;

import org.codelibs.core.beans.Converter;
import org.codelibs.core.convert.DateConversionUtil;
import org.codelibs.core.convert.StringConversionUtil;

 */
package org.codelibs.core.beans.converter;

import static org.codelibs.core.lang.StringUtil.isEmpty;
import static org.codelibs.core.misc.AssertionUtil.assertArgumentNotEmpty;
import static org.codelibs.core.misc.AssertionUtil.assertArgumentNotNull;

import java.util.Date;

import org.codelibs.core.beans.Converter;
import org.codelibs.core.convert.StringConversionUtil;

 * governing permissions and limitations under the License.
 */
package org.codelibs.core.exception;

import static org.codelibs.core.collection.ArrayUtil.asArray;

import org.codelibs.core.beans.Converter;

/**
 * {@link Converter}でエラーが起きた場合にスローされる例外です。
 *
 * @author higa
 */
public class ConverterRuntimeException extends ClRuntimeException {

    private static final long serialVersionUID = 1L;

   * Ensures the truth of an expression involving one or more parameters to the calling method.
   *
   * @param expression a boolean expression
   * @param errorMessage the exception message to use if the check fails; will be converted to a
   *     string using {@link String#valueOf(Object)}
   * @throws IllegalArgumentException if {@code expression} is false
   */
  public static void checkArgument(boolean expression, @CheckForNull Object errorMessage) {

import java.util.List;
import java.util.Map;

import org.codelibs.core.beans.Converter;
import org.codelibs.core.beans.converter.DateConverter;
import org.codelibs.core.beans.converter.NumberConverter;
import org.codelibs.core.beans.converter.SqlDateConverter;
import org.codelibs.core.beans.converter.TimeConverter;
import org.codelibs.core.beans.converter.TimestampConverter;
import org.codelibs.core.convert.DateConversionUtil;

 * governing permissions and limitations under the License.
 */
package org.codelibs.core.beans;

/**
 * 文字列とオブジェクトの変換を行なうインターフェースです。
 *
 * @author higa
 */
public interface Converter {

    /**
     * 値を文字列として返します。
     *
     * @param value
     *            値
     * @return 文字列としての値
     */
    String getAsString(Object value);

    /**
     * 値をオブジェクトとして返します。
     *

     */
    @Test
    public void testGetAsObjectAndGetAsString() throws Exception {
        final DateConverter converter = new DateConverter("yyyy/MM/dd");
        final Date result = (Date) converter.getAsObject("2008/01/16");
        System.out.println(result);
        assertThat(converter.getAsString(result), is("2008/01/16"));
    }

    /**
     * @throws Exception
     */
    @Test

    Converter<String, Integer> converter = Maps.asConverter(biMap);
    assertNull(converter.convert(null));
    assertNull(converter.reverse().convert(null));
  }

  public void testAsConverter_isAView() throws Exception {
    BiMap<String, Integer> biMap = HashBiMap.create();
    biMap.put("one", 1);
    biMap.put("two", 2);
    Converter<String, Integer> converter = Maps.asConverter(biMap);