content: /*
   * Copyright 1999-2101 Alibaba Group.
   *
   * 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.alibaba.simpleEL.eval;
  
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Map;
  import java.util.concurrent.ConcurrentHashMap;
  import java.util.concurrent.ConcurrentMap;
  
  import com.alibaba.simpleEL.Expr;
  import com.alibaba.simpleEL.ExprCacheProvider;
  
  /**
   * @author wenshao<szujobs@hotmail.com>
   *
   */
  public class DefaultExprCacheProvider implements ExprCacheProvider {
  	private ConcurrentMap<String, Expr> cache = new ConcurrentHashMap<String, Expr>();
  
  	@Override
  	public Expr get(Map<String, Object> ctx, String expr) {
  		return cache.get(expr);
  	}
  
  	@Override
  	public Expr putIfAbsent(Map<String, Object> ctx, String expr, Expr compiledExpr) {
  		return cache.put(expr, compiledExpr);
  	}
  
  	@Override
  	public void clear() {
  		cache.clear();
  	}
  	
  	@Override
  	public List<Expr> getCacheExpressions() {
  		return new ArrayList<Expr>(cache.values());
  	}
  
  }
  