UUIDConverter.java

/*
 * Copyright (c) 2001-2007, Inversoft Inc., All Rights Reserved
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied. See the License for the specific
 * language governing permissions and limitations under the License.
 */
package org.primeframework.mvc.parameter.convert.converters;

import com.google.inject.Inject;
import org.apache.commons.lang3.StringUtils;
import org.primeframework.mvc.config.MVCConfiguration;
import org.primeframework.mvc.parameter.convert.AbstractGlobalConverter;
import org.primeframework.mvc.parameter.convert.ConversionException;
import org.primeframework.mvc.parameter.convert.ConverterStateException;
import org.primeframework.mvc.parameter.convert.annotation.GlobalConverter;

import java.lang.reflect.Type;
import java.util.Map;
import java.util.UUID;

/**
 * This converts to and from UUID.
 *
 * @author Brian Pontarelli
 */
@GlobalConverter
public class UUIDConverter extends AbstractGlobalConverter {
  private final boolean emptyIsNull;

  @Inject
  public UUIDConverter(MVCConfiguration configuration) {
    this.emptyIsNull = configuration.emptyParametersAreNull();
  }

  protected Object stringToObject(String value, Type convertTo, Map<String, String> attributes, String expression)
      throws ConversionException, ConverterStateException {
    if (emptyIsNull && StringUtils.isBlank(value)) {
      return null;
    }

    try {
      return UUID.fromString(value);
    } catch (IllegalArgumentException iae) {
      // Try as an integer
      try {
        long l = Long.parseLong(value);
        return new UUID(0, l);
      } catch (NumberFormatException e) {
        throw new ConversionException();
      }
    }
  }

  protected Object stringsToObject(String[] values, Type convertTo, Map<String, String> attributes, String expression)
      throws ConversionException, ConverterStateException {
    throw new UnsupportedOperationException("You are attempting to map a form field that contains " +
        "multiple parameters to a property on the action class that is of type UUID. This isn't " +
        "allowed.");
  }

  protected String objectToString(Object value, Type convertFrom, Map<String, String> attributes, String expression)
      throws ConversionException, ConverterStateException {
    UUID uuid = (UUID) value;
    if (uuid.getMostSignificantBits() == 0) {
      return Long.toString(uuid.getLeastSignificantBits());
    }
    return value.toString();
  }
}