BasicKeyImpl.java

/*
 * This is a common dao with basic CRUD operations and is not limited to any 
 * persistent layer implementation
 * 
 * Copyright (C) 2008  Imran M Yousuf (imyousuf@smartitengineering.com)
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */
package com.smartitengineering.dao.common.cache.impl;

import com.google.inject.Inject;
import com.smartitengineering.dao.common.cache.BasicKey;
import com.smartitengineering.dao.common.cache.CacheKeyPrefixStrategy;
import java.io.Serializable;

/**
 *
 * @author imyousuf
 */
public class BasicKeyImpl<KeyId extends Serializable> implements BasicKey<KeyId> {

  private CacheKeyPrefixStrategy prefixStrategy;
  private boolean initialized;

  public BasicKeyImpl() {
  }

  @Inject
  public BasicKeyImpl(CacheKeyPrefixStrategy prefixStrategy) {
    init(prefixStrategy);
  }

  @Override
  public final void init(CacheKeyPrefixStrategy prefixStrategy) {
    if (prefixStrategy == null) {
      throw new NullPointerException();
    }
    this.prefixStrategy = prefixStrategy;
    initialized = true;
  }

  @Override
  public boolean isInitialized() {
    return initialized;
  }

  @Override
  public String getKey(KeyId key) {
    if (key == null) {
      throw new IllegalArgumentException();
    }
    if (!isInitialized()) {
      throw new IllegalStateException();
    }
    StringBuilder builder = new StringBuilder(prefixStrategy.getPrefix());
    builder.append(prefixStrategy.getPreferredPrefixIdSeparator());
    builder.append(key.toString());
    return builder.toString();
  }
}