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package jdk.internal.joptsimple.util;

import java.text.MessageFormat;
import java.util.EnumSet;
import java.util.Iterator;
import java.util.ResourceBundle;

import jdk.internal.joptsimple.ValueConversionException;
import jdk.internal.joptsimple.ValueConverter;

Converts values to Enums.
Author:Christian Ohr
/** * Converts values to {@link java.lang.Enum}s. * * @author <a href="mailto:christian.ohr@gmail.com">Christian Ohr</a> */
public abstract class EnumConverter<E extends Enum<E>> implements ValueConverter<E> { private final Class<E> clazz; private String delimiters = "[,]";
This constructor must be called by subclasses, providing the enum class as the parameter.
Params:
  • clazz – enum class
/** * This constructor must be called by subclasses, providing the enum class as the parameter. * * @param clazz enum class */
protected EnumConverter( Class<E> clazz ) { this.clazz = clazz; } @Override public E convert( String value ) { for ( E each : valueType().getEnumConstants() ) { if ( each.name().equalsIgnoreCase( value ) ) { return each; } } throw new ValueConversionException( message( value ) ); } @Override public Class<E> valueType() { return clazz; }
Sets the delimiters for the message string. Must be a 3-letter string, where the first character is the prefix, the second character is the delimiter between the values, and the 3rd character is the suffix.
Params:
  • delimiters – delimiters for message string. Default is [,]
/** * Sets the delimiters for the message string. Must be a 3-letter string, * where the first character is the prefix, the second character is the * delimiter between the values, and the 3rd character is the suffix. * * @param delimiters delimiters for message string. Default is [,] */
public void setDelimiters( String delimiters ) { this.delimiters = delimiters; } @Override public String valuePattern() { EnumSet<E> values = EnumSet.allOf( valueType() ); StringBuilder builder = new StringBuilder(); builder.append( delimiters.charAt(0) ); for ( Iterator<E> i = values.iterator(); i.hasNext(); ) { builder.append( i.next().toString() ); if ( i.hasNext() ) builder.append( delimiters.charAt( 1 ) ); } builder.append( delimiters.charAt( 2 ) ); return builder.toString(); } private String message( String value ) { ResourceBundle bundle = ResourceBundle.getBundle( "jdk.internal.joptsimple.ExceptionMessages" ); Object[] arguments = new Object[] { value, valuePattern() }; String template = bundle.getString( EnumConverter.class.getName() + ".message" ); return new MessageFormat( template ).format( arguments ); } }