/*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you 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.apache.chemistry.opencmis.client.bindings.impl;
  
  import java.io.Serializable;
  import java.util.Collection;
  import java.util.HashMap;
  import java.util.Map;
  import java.util.UUID;
  import java.util.concurrent.locks.ReentrantReadWriteLock;
  
  import org.apache.chemistry.opencmis.client.bindings.spi.BindingSession;
  
  /**
   * CMIS binding session implementation.
   */
  public class SessionImpl implements BindingSession {
  
      private static final long serialVersionUID = 1L;
  
      private final String id;
      private final Map<String, Object> data;
  
      private final ReentrantReadWriteLock lock = new ReentrantReadWriteLock();
  
      /**
       * Constructor.
       */
      public SessionImpl() {
          id = UUID.randomUUID().toString();
          data = new HashMap<String, Object>();
      }
  
      @Override
      public String getSessionId() {
          return id;
      }
  
      @Override
      public Collection<String> getKeys() {
          return data.keySet();
      }
  
      @Override
      public Object get(String key) {
          Object value = null;
  
          lock.readLock().lock();
          try {
              value = data.get(key);
          } finally {
              lock.readLock().unlock();
          }
  
          if (value instanceof TransientWrapper) {
              return ((TransientWrapper) value).getObject();
          }
  
          return value;
      }
  
      @Override
      public Object get(String key, Object defValue) {
          Object value = get(key);
          return value == null ? defValue : value;
      }
  
      @Override
      public int get(String key, int defValue) {
          Object value = get(key);
          int intValue = defValue;
  
          if (value instanceof Integer) {
              intValue = ((Integer) value).intValue();
          } else if (value instanceof String) {
              try {
                  intValue = Integer.valueOf((String) value);
              } catch (NumberFormatException e) {
                  // invalid number -> return default value
              }
          }
  
          return intValue;
     }
 
     @Override
     public boolean get(String key, boolean defValue) {
         Object value = get(key);
 
         if (value instanceof Boolean) {
             return ((Boolean) value).booleanValue();
         }
 
         if (value instanceof String) {
             return Boolean.parseBoolean((String) value);
         }
 
         return defValue;
     }
 
     @Override
     public void put(String key, Serializable obj) {
         lock.writeLock().lock();
         try {
             data.put(key, obj);
         } finally {
             lock.writeLock().unlock();
         }
     }
 
     @Override
     public void put(String key, Object obj, boolean isTransient) {
         Object value = isTransient ? new TransientWrapper(obj) : obj;
         if (!(value instanceof Serializable)) {
             throw new IllegalArgumentException("Object must be serializable!");
         }
 
         lock.writeLock().lock();
         try {
             data.put(key, value);
         } finally {
             lock.writeLock().unlock();
         }
     }
 
     @Override
     public void remove(String key) {
         lock.writeLock().lock();
         try {
             data.remove(key);
         } finally {
             lock.writeLock().unlock();
         }
     }
 
     @Override
     public void readLock() {
         lock.readLock().lock();
     }
 
     @Override
     public void readUnlock() {
         lock.readLock().unlock();
     }
 
     @Override
     public void writeLock() {
         lock.writeLock().lock();
     }
 
     @Override
     public void writeUnlock() {
         lock.writeLock().unlock();
     }
 
     @Override
     public String toString() {
         return "Session " + id + ": " + data.toString();
     }
 }