public void testConverterToForward() {
    assertEquals("FooBar", UPPER_UNDERSCORE.converterTo(UPPER_CAMEL).convert("FOO_BAR"));
    assertEquals("fooBar", UPPER_UNDERSCORE.converterTo(LOWER_CAMEL).convert("FOO_BAR"));
    assertEquals("FOO_BAR", UPPER_CAMEL.converterTo(UPPER_UNDERSCORE).convert("FooBar"));
    assertEquals("FOO_BAR", LOWER_CAMEL.converterTo(UPPER_UNDERSCORE).convert("fooBar"));
  }

  public void testConverterToBackward() {

  public void testConverterToForward() {
    assertEquals("FooBar", UPPER_UNDERSCORE.converterTo(UPPER_CAMEL).convert("FOO_BAR"));
    assertEquals("fooBar", UPPER_UNDERSCORE.converterTo(LOWER_CAMEL).convert("FOO_BAR"));
    assertEquals("FOO_BAR", UPPER_CAMEL.converterTo(UPPER_UNDERSCORE).convert("FooBar"));
    assertEquals("FOO_BAR", LOWER_CAMEL.converterTo(UPPER_UNDERSCORE).convert("fooBar"));
  }

  public void testConverterToBackward() {

  }

  /**
   * Returns a serializable {@code Converter} that converts strings from this format to {@code
   * targetFormat}.
   *
   * @since 16.0
   */
  public Converter<String, String> converterTo(CaseFormat targetFormat) {
    return new StringConverter(this, targetFormat);
  }

  private static final class StringConverter extends Converter<String, String>
      implements Serializable {

  }

  /**
   * Returns a serializable {@code Converter} that converts strings from this format to {@code
   * targetFormat}.
   *
   * @since 16.0
   */
  public Converter<String, String> converterTo(CaseFormat targetFormat) {
    return new StringConverter(this, targetFormat);
  }

  private static final class StringConverter extends Converter<String, String>
      implements Serializable {

  }

  /**
   * Returns a converter whose {@code convert} method applies {@code secondConverter} to the result
   * of this converter. Its {@code reverse} method applies the converters in reverse order.
   *
   * <p>The returned converter is serializable if {@code this} converter and {@code secondConverter}
   * are.
   */
  public final <C> Converter<A, C> andThen(Converter<B, C> secondConverter) {

  }

  /**
   * Returns a converter whose {@code convert} method applies {@code secondConverter} to the result
   * of this converter. Its {@code reverse} method applies the converters in reverse order.
   *
   * <p>The returned converter is serializable if {@code this} converter and {@code secondConverter}
   * are.
   */
  public final <C> Converter<A, C> andThen(Converter<B, C> secondConverter) {

 * 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 testCopyBeanToMap_converter2() throws Exception {
        final Bean bean = new Bean();
        bean.aaa = "1,000";
        final Map<String, Object> map = newHashMap();
        BeanUtil.copyBeanToMap(bean, map, converter(new NumberConverter("#,##0"), BeanNames.aaa()));
        assertThat(map.get("aaa"), is((Object) 1000L));
    }

    /**
     * @throws Exception
     */
    @Test

import org.codehaus.plexus.component.configurator.converters.ConfigurationConverter;
import org.codehaus.plexus.component.configurator.converters.composite.ObjectWithFieldsConverter;
import org.codehaus.plexus.component.configurator.converters.lookup.ConverterLookup;
import org.codehaus.plexus.component.configurator.converters.lookup.DefaultConverterLookup;

class EnhancedConverterLookup implements ConverterLookup {

    Converter<String, Number> converter = Converter.<String, Number>from(forward, backward);

    assertNull(converter.convert(null));
    assertNull(converter.reverse().convert(null));

    assertEquals((Integer) 5, converter.convert("5"));
    assertEquals("5", converter.reverse().convert(5));
  }

  public void testNullIsPassedThrough() {