StringValueFormatter.java

/*******************************************************************************
 * Copyright (c) 2008 Ralf Ebert
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 * Ralf Ebert - initial API and implementation
 *******************************************************************************/
package de.ralfebert.rcputils.tables.format;

import java.text.Format;
import java.text.ParseException;

import de.ralfebert.rcputils.properties.IValueFormatter;

/**
 * ValueFormatter for String.valueOf / java.text.Format.
 * 
 * @author Ralf Ebert <info@ralfebert.de>
 */
public class StringValueFormatter implements IValueFormatter<Object, String> {

  public static final StringValueFormatter INSTANCE = new StringValueFormatter();

  private final Format format;

  private StringValueFormatter() {
    this.format = null;
  }

  public StringValueFormatter(Format format) {
    this.format = format;
  }

  @Override
  public String format(Object obj) {
    if (format == null) {
      return String.valueOf(obj);
    }
    return format.format(obj);
  }

  @Override
  public Object parse(String str) {
    if (format == null) {
      return str;
    }
    try {
      return format.parseObject(str);
    } catch (ParseException e) {
      throw new InvalidValueException(e.getMessage() + " for \"" + str + "\"", e);
    }
  }
}