001// Copyright 2004, 2005 The Apache Software Foundation 002// 003// Licensed under the Apache License, Version 2.0 (the "License"); 004// you may not use this file except in compliance with the License. 005// You may obtain a copy of the License at 006// 007// http://www.apache.org/licenses/LICENSE-2.0 008// 009// Unless required by applicable law or agreed to in writing, software 010// distributed under the License is distributed on an "AS IS" BASIS, 011// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 012// See the License for the specific language governing permissions and 013// limitations under the License. 014 015package org.apache.hivemind.schema; 016 017import org.apache.hivemind.Locatable; 018import org.apache.hivemind.parse.AnnotationHolder; 019 020 021/** 022 * Part of a {@link Schema}, used to specify an attribute allowed within 023 * an {@link org.apache.hivemind.schema.ElementModel}. 024 * 025 * @author Howard Lewis Ship 026 */ 027public interface AttributeModel extends Locatable, AnnotationHolder 028{ 029 /** 030 * The name of the attribute. 031 */ 032 public String getName(); 033 034 /** 035 * Returns true if the attribute is required (must be specified). Otherwise, 036 * the attribute is optional and may be omitted. 037 */ 038 public boolean isRequired(); 039 040 /** 041 * Returns the translator used to convert the attribute value. This is used 042 * to locate a {@link org.apache.hivemind.schema.Translator}. 043 */ 044 public String getTranslator(); 045 046 /** 047 * Returns true if the attribute is supposed to be considered unique in relation to the configuration point. 048 * @return True if the attribute must be unique with respect to it's xpath, otherwise false 049 */ 050 public boolean isUnique(); 051 052}