BooleanConverter.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 Boolean}.
 * 
 * @author Stefan Schmidt
 * @since 1.0
 */
public class BooleanConverter implements Converter<Boolean> {

  public Boolean convertFromText(final String value, final Class<?> requiredType,
      final String optionContext) {
    if ("true".equalsIgnoreCase(value) || "1".equals(value) || "yes".equalsIgnoreCase(value)) {
      return true;
    } else if ("false".equalsIgnoreCase(value) || "0".equals(value) || "no".equalsIgnoreCase(value)) {
      return false;
    } else {
      throw new IllegalArgumentException("Cannot convert " + value + " to type Boolean.");
    }
  }

  public boolean getAllPossibleValues(final List<Completion> completions,
      final Class<?> requiredType, final String existingData, final String optionContext,
      final MethodTarget target) {
    completions.add(new Completion("true"));
    completions.add(new Completion("false"));
    completions.add(new Completion("yes"));
    completions.add(new Completion("no"));
    completions.add(new Completion("1"));
    completions.add(new Completion("0"));
    return false;
  }

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