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1   /*
2    * Copyright 2007-2008 the original author or authors.
3    * 
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    * 
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    * 
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  
17  package org.gwe.p2elv2;
18  
19  import java.util.HashMap;
20  import java.util.List;
21  import java.util.Map;
22  
23  
24  /**
25   * @author Marco Ruiz
26   * @since Jul 30, 2008
27   */
28  public abstract class PFunction {
29  	
30  	private static Map<String, PFunction> functionsRegistry = new HashMap<String, PFunction>();
31  	public static PFunction getFunction(String functionName) { return functionsRegistry.get(functionName); }
32  	
33  	private String name;
34  	
35  	public PFunction(String name) {
36  	    this.name = name;
37  	    functionsRegistry.put(name, this);
38      }
39  
40  	public String getName() {
41      	return name;
42      }
43  	
44  	public boolean isSingleValue(List<String> params) {
45  		return false;
46  	}
47  
48  	public boolean isRuntime() {
49  	    return false;
50      }
51  
52  	public boolean isCompiletime() {
53  	    return !isRuntime();
54      }
55  
56  	public abstract PVarValueSpace calculateValues(List<String> params, PStatementContext ctx);
57  }
58