EnumConverter.java

package org.springframework.roo.converters;

import java.util.List;

import org.springframework.roo.shell.Completion;
import org.springframework.roo.shell.Converter;
import org.springframework.roo.shell.MethodTarget;

/**
 * {@link Converter} for {@link Enum}.
 * 
 * @author Ben Alex
 * @author Alan Stewart
 * @since 1.0
 */
@SuppressWarnings("all")
public class EnumConverter implements Converter<Enum> {

  public Enum convertFromText(final String value, final Class<?> requiredType,
      final String optionContext) {
    final Class<Enum> enumClass = (Class<Enum>) requiredType;
    return Enum.valueOf(enumClass, value);
  }

  public boolean getAllPossibleValues(final List<Completion> completions,
      final Class<?> requiredType, final String existingData, final String optionContext,
      final MethodTarget target) {
    final Class<Enum> enumClass = (Class<Enum>) requiredType;
    for (final Enum enumValue : enumClass.getEnumConstants()) {
      final String candidate = enumValue.name();
      if ("".equals(existingData) || candidate.startsWith(existingData)
          || existingData.startsWith(candidate)
          || candidate.toUpperCase().startsWith(existingData.toUpperCase())
          || existingData.toUpperCase().startsWith(candidate.toUpperCase())) {
        completions.add(new Completion(candidate));
      }
    }
    return true;
  }

  public boolean supports(final Class<?> requiredType, final String optionContext) {
    return Enum.class.isAssignableFrom(requiredType);
  }
}