/*
    * 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.cache.impl;
  
  import java.util.Map;
  
  import org.apache.chemistry.opencmis.client.bindings.cache.CacheLevel;
  
  /**
   * Abstract Map cache.
   */
  public abstract class AbstractMapCacheLevel implements CacheLevel {
  
      private static final long serialVersionUID = 1L;
  
      private Map<String, Object> fMap;
      private boolean fFallbackEnabled = false;
      private String fFallbackKey;
      private boolean fSingleValueEnabled = false;
  
      @Override
      public abstract void initialize(Map<String, String> parameters);
  
      @Override
      public Object get(String key) {
          Object value = fMap.get(key);
  
          if (value == null && fFallbackEnabled) {
              value = fMap.get(fFallbackKey);
          }
  
          if (value == null && fSingleValueEnabled) {
              if (fMap.size() == 1) {
                  value = fMap.values().iterator().next();
              }
          }
  
          return value;
      }
  
      @Override
      public void put(Object value, String key) {
          fMap.put(key, value);
      }
  
      @Override
      public void remove(String key) {
          fMap.remove(key);
      }
  
      /**
       * Returns the internal map.
       */
      protected Map<String, Object> getMap() {
          return fMap;
      }
  
      /**
       * Sets the internal map.
       */
      protected void setMap(Map<String, Object> map) {
          fMap = map;
      }
  
      /**
       * Enables a fallback key if no value was found for a requested key.
       */
      protected void enableKeyFallback(String key) {
          fFallbackKey = key;
          fFallbackEnabled = true;
      }
  
      /**
       * Disables the fallback key.
       */
      protected void disableKeyFallback() {
          fFallbackEnabled = false;
      }
  
      /**
       * Enables the single value fallback.
       */
      protected void enableSingeValueFallback() {
         fSingleValueEnabled = true;
     }
 
     /**
      * Disables the single value fallback.
      */
     protected void disableSingeValueFallback() {
         fSingleValueEnabled = false;
     }
 
     /**
      * Extracts an integer parameter from the parameters.
      * 
      * @param parameters
      *            the parameter map
      * @param name
      *            the parameter name
      * @param defValue
      *            the default value if the parameter can't be found
      */
     protected int getIntParameter(Map<String, String> parameters, String name, int defValue) {
         if (parameters == null) {
             return defValue;
         }
 
         String value = parameters.get(name);
         if (value == null || value.trim().length() == 0) {
             return defValue;
         }
 
         try {
             return Integer.valueOf(value);
         } catch (NumberFormatException e) {
             return defValue;
         }
     }
 
     /**
      * Extracts a float parameter from the parameters.
      * 
      * @param parameters
      *            the parameter map
      * @param name
      *            the parameter name
      * @param defValue
      *            the default value if the parameter can't be found
      */
     protected float getFloatParameter(Map<String, String> parameters, String name, float defValue) {
         if (parameters == null) {
             return defValue;
         }
 
         String value = parameters.get(name);
         if (value == null || value.trim().length() == 0) {
             return defValue;
         }
 
         try {
             return Float.valueOf(value);
         } catch (NumberFormatException e) {
             return defValue;
         }
     }
 
     /**
      * Extracts a boolean parameter from the parameters.
      * 
      * @param parameters
      *            the parameter map
      * @param name
      *            the parameter name
      * @param defValue
      *            the default value if the parameter can't be found
      */
     protected boolean getBooleanParameter(Map<String, String> parameters, String name, boolean defValue) {
         if (parameters == null) {
             return defValue;
         }
 
         String value = parameters.get(name);
         if (value == null || value.trim().length() == 0) {
             return defValue;
         }
 
         return Boolean.parseBoolean(value);
     }
 
     /*
      * (non-Javadoc)
      * 
      * @see java.lang.Object#toString()
      */
     @Override
     public String toString() {
         return fMap == null ? "[no map]" : fMap.toString();
     }
 }