1 /** 2 The contents of this file are subject to the Mozilla Public License Version 1.1 3 (the "License"); you may not use this file except in compliance with the License. 4 You may obtain a copy of the License at http://www.mozilla.org/MPL/ 5 Software distributed under the License is distributed on an "AS IS" basis, 6 WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for the 7 specific language governing rights and limitations under the License. 8 9 The Original Code is "Expression.java". Description: 10 "Expressions used for validation rules" 11 12 The Initial Developer of the Original Code is University Health Network. Copyright (C) 13 2012. All Rights Reserved. 14 15 Contributor(s): ______________________________________. 16 17 Alternatively, the contents of this file may be used under the terms of the 18 GNU General Public License (the "GPL"), in which case the provisions of the GPL are 19 applicable instead of those above. If you wish to allow use of your version of this 20 file only under the terms of the GPL and not to allow others to use your version 21 of this file under the MPL, indicate your decision by deleting the provisions above 22 and replace them with the notice and other provisions required by the GPL License. 23 If you do not delete the provisions above, a recipient may use your version of 24 this file under either the MPL or the GPL. 25 */ 26 package ca.uhn.hl7v2.validation.builder; 27 28 29 import ca.uhn.hl7v2.HL7Exception; 30 import ca.uhn.hl7v2.Location; 31 import ca.uhn.hl7v2.model.Structure; 32 33 /** 34 * Expression used to obtain values from a message structure 35 * 36 * @param <T> 37 */ 38 public interface Expression<T extends Structure> { 39 40 /** 41 * Applies this expression on the structure 42 * 43 * @param structure HL7 structure to be evaluated 44 * @return the result value 45 * @throws HL7Exception 46 */ 47 Object evaluate(T structure) throws HL7Exception; 48 49 /** 50 * Returns the expression description used for describing the Rule this expression 51 * is used in. 52 * 53 * @return description 54 */ 55 String getDescription(); 56 57 /** 58 * Returns the location of the structure to which is expression is applied to 59 * 60 * @param structure HL7 structure to be located 61 * @return the location of the structure 62 * @throws HL7Exception if the structure refers to an invalid location 63 */ 64 Location getLocation(T structure) throws HL7Exception; 65 }