/**
 * Copyright (C) 2006 Google Inc.
 *
 * 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 com.google.inject.util;

import net.sf.cglib.core.NamingPolicy;
import net.sf.cglib.core.Predicate;

/**
 * Cglib class naming policy for Guice.
 *
 * @author crazybob@google.com (Bob Lee)
 */
public class GuiceNamingPolicy implements NamingPolicy {

  public String getClassName(String prefix, String source, Object key,
                             Predicate names) {
    StringBuffer sb = new StringBuffer();
    sb.append(
        (prefix != null) ?
            (
                prefix.startsWith("java") ?
                    "$" + prefix : prefix
            )
            : "net.sf.cglib.empty.Object"
    );
    sb.append("$$");
    sb.append(source.substring(source.lastIndexOf('.') + 1));
    sb.append("ByGuice$$");
    sb.append(Integer.toHexString(key.hashCode()));
    String base = sb.toString();
    String attempt = base;
    int index = 2;
    while (names.evaluate(attempt)) {
      attempt = base + "_" + index++;
    }

    return attempt;
  }
}