001 /**
002 * Copyright 2005-2012 The Kuali Foundation
003 *
004 * Licensed under the Educational Community License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.opensource.org/licenses/ecl2.php
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016 package org.kuali.rice.krad.datadictionary.validation;
017
018 import org.kuali.rice.krad.datadictionary.exception.AttributeValidationException;
019 import org.kuali.rice.krad.datadictionary.validation.capability.Constrainable;
020
021 import java.util.List;
022
023 /**
024 * An interface to define classes that encapsulate access to both dictionary metadata and object field values, for example, by reflection
025 * and introspection, for the purpose of performing validation against constraints defined in the DictionaryValidationService implementation.
026 *
027 * Practically speaking, this interface should only need to be implemented by a small number of classes. The two major use cases are for
028 * (1) a dictionary object with members
029 * (2) a specific member of a dictionary object
030 *
031 * In the first case, implementing classes should provide access to all underlying members of the object via reflection or some other mechanism.
032 * In the second case, implementing classes only need to provide access to the value associated with that specific member, and constraints
033 * requiring access to additional members will be skipped.
034 *
035 * @author Kuali Rice Team (rice.collab@kuali.org)
036 * @since 1.1
037 */
038 public interface AttributeValueReader {
039
040 /**
041 * This method is an accessor for the attribute name that is currently being processed by the DictionaryValidationService implementation.
042 *
043 * @return the current attribute name being processed
044 */
045 public String getAttributeName();
046
047 /**
048 * This method provides access to the constrainable attribute definition of a specific attribute name. If the value of the metadata
049 * associated with the object field does not implement constrainable, or if no metadata is associated with this object field,
050 * then null should be returned.
051 *
052 * @param attributeName - the name of the attribute/field whose metadata is being requested
053 * @return dictionary metadata object implementing some constrainable capability
054 */
055 public Constrainable getDefinition(String attributeName);
056
057 /**
058 * This method returns a list of all constrainable dictionary metadata definitions for attributes or fields encapsulated by this object.
059 *
060 * @return a list of constrainable definitions
061 */
062 public List<Constrainable> getDefinitions();
063
064 /**
065 * The dictionary metadata associated with an object (its "entry" in the dictionary) can also be constrainable, in which case the object
066 * value itself can be validated against one or more constraints. If the specific entry for the dictionary object encapsulated by this
067 * reader is not constrainable, or if no entry exists for this dictionary object, or no dictionary object is being encapsulted, then
068 * null should be returned.
069 *
070 * @return the constrainable dictionary entry metadata for this object, or null
071 */
072 public Constrainable getEntry();
073
074 /**
075 * An entry name should be returned for the purposes of correcting looking up errors, which are generally found by entry name +
076 * attribute name + error key.
077 *
078 * @return the name that the data dictionary uses to store metadata about this object (not its attributes)
079 */
080 public String getEntryName();
081
082 /**
083 * This method looks up a label for a specific attribute name.
084 *
085 * @param attributeName
086 * @return some descriptive label that can be exposed to the end user for error messages
087 */
088 public String getLabel(String attributeName);
089
090 /**
091 * The underlying object itself (not the field/attribute value, but the object).
092 *
093 * @return the object that is being encapsulated by this reader, or null if no object is being encapsulated.
094 */
095 public Object getObject();
096
097 /**
098 * The path is a string representation of specifically which attribute (at some depth) is being accessed, for example, on a
099 * person object there might be the following field path:
100 *
101 * joe.home.mailingAddress.state
102 *
103 * @return the string representation of the attribute identifier currently being processed
104 */
105 public String getPath();
106
107 /**
108 * The type of the attribute specified. A Java class.
109 *
110 * @param attributeName
111 * @return the type of the attribute referenced by the passed name, or null if no attribute exists of that name
112 */
113 public Class<?> getType(String attributeName);
114
115 /**
116 * Indicates whether the configured attribute name is readable for the object
117 *
118 * @return boolean if attribute is readable, false if not
119 */
120 public boolean isReadable();
121
122 /**
123 * A convenience method for looking up the attribute value that is currently being processed.
124 *
125 * @param <X>
126 * @return
127 * @throws AttributeValidationException
128 */
129 public <X> X getValue() throws AttributeValidationException;
130
131 /**
132 * A method for looking up any attribute value by name for the object being processed.
133 *
134 * @param <X>
135 * @param attributeName
136 * @return
137 * @throws AttributeValidationException
138 */
139 public <X> X getValue(String attributeName) throws AttributeValidationException;
140
141 /**
142 * A method to enable legacy processing of string representations of attribute values like a date range in the format
143 * 12/03/2001..1/29/2009
144 *
145 * @param attributeName
146 * @return the list of token strings for the attribute value of the named attribute
147 * @throws AttributeValidationException
148 */
149 public List<String> getCleanSearchableValues(String attributeName) throws AttributeValidationException;
150
151 /**
152 * Setter for the current attribute that is being processed.
153 *
154 * @param attributeName
155 */
156 public void setAttributeName(String attributeName);
157
158 public AttributeValueReader clone();
159
160 }
161