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1   /**
2    * Copyright 2005-2015 The Kuali Foundation
3    *
4    * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php
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  package org.kuali.rice.krad.uif.modifier;
17  
18  import java.io.Serializable;
19  import java.util.List;
20  import java.util.Set;
21  
22  import org.kuali.rice.krad.datadictionary.uif.UifDictionaryBean;
23  import org.kuali.rice.krad.uif.component.Component;
24  import org.kuali.rice.krad.uif.component.Ordered;
25  import org.kuali.rice.krad.uif.lifecycle.RunComponentModifiersTask;
26  
27  /**
28   * Provides modification functionality for a <code>Component</code>
29   *
30   * <p>
31   * <code>ComponentModifier</code> instances are configured by the component's
32   * dictionary definition. They can be used to provide dynamic initialization
33   * behavior for a certain type of component or all components based on the
34   * getComponentsForLifecycle method. In addition they can do dynamic generation of
35   * new <code>Component</code> instances, or replacement of the components or
36   * their properties.
37   * </p>
38   *
39   * <p>
40   * Modifiers provide for more usability and flexibility of component
41   * configuration. For instance if a <code>Group</code> definition is already
42   * configured that is close to what the developer needs, but they need to make
43   * global changes of the group, then can invoke or create a
44   * <code>ComponentModifier</code> for the group to apply those changes. The
45   * configuration can then inherit the exiting group definition and then specify
46   * the modifier to run with the component's componentModifiers property.
47   * </p>
48   *
49   * @author Kuali Rice Team (rice.collab@kuali.org)
50   */
51  public interface ComponentModifier extends UifDictionaryBean, Serializable, Ordered {
52  
53      /**
54       * Should be called to initialize the ComponentModifier
55       *
56       * <p>
57       * This is where component modifiers can set defaults and setup other necessary
58       * state. The initialize method should only be called once per layout
59       * manager lifecycle and is invoked within the initialize phase of the view
60       * lifecylce.
61       * </p>
62       *
63       * <p>
64       * Note if the component modifier holds nested components, they should be initialized
65       * in this method by calling the view helper service
66       * </p>
67       *
68       * @param model - object instance containing the view data
69       * @param component - Component the modifier is configured on
70       * @see RunComponentModifiersTask
71       */
72      public void performInitialization(Object model, Component component);
73  
74      /**
75       * Invoked within the configured phase of the component lifecycle. This is
76       * where the <code>ComponentModifier</code> should perform its work against
77       * the given <code>Component</code> instance
78       *
79       * @param model - top level object containing the view data
80       * @param component - the component instance to modify
81       * @see RunComponentModifiersTask
82       */
83      public void performModification(Object model, Component component);
84  
85      /**
86       * <code>Set</code> of <code>Component</code> classes that may be sent to
87       * the modifier
88       *
89       * <p>
90       * If an empty or null list is returned, it is assumed the modifier supports
91       * all components. The returned set will be used by the dictionary
92       * validation
93       * </p>
94       *
95       * @return Set component classes
96       */
97      public Set<Class<? extends Component>> getSupportedComponents();
98  
99      /**
100      * List of components that are maintained by the modifier as prototypes for creating other component instances
101      *
102      * <p>
103      * Prototypes are held for configuring how a component should be created during the lifecycle. An example of this
104      * are the fields in a collection group that are created for each collection record. They only participate in the
105      * initialize phase.
106      * </p>
107      *
108      * @return List<Component> child component prototypes
109      */
110     public List<Component> getComponentPrototypes();
111 
112     /**
113      * Indicates what phase of the component lifecycle the
114      * <code>ComponentModifier</code> should be invoked in (INITIALIZE,
115      * APPLY_MODEL, or FINALIZE)
116      *
117      * @return String view lifecycle phase
118      * @see org.kuali.rice.krad.uif.UifConstants.ViewPhases
119      */
120     public String getRunPhase();
121 
122     /**
123      * Conditional expression to evaluate for determining whether the component
124      * modifier should be run. If the expression evaluates to true the modifier
125      * will be executed, otherwise it will not be executed
126      *
127      * @return String el expression that should evaluate to boolean
128      */
129     public String getRunCondition();
130 
131     /**
132      * @see org.springframework.core.Ordered#getOrder()
133      */
134     public int getOrder();
135 
136     /**
137      * @see org.kuali.rice.krad.uif.component.Ordered#setOrder(int)
138      */
139     public void setOrder(int order);
140 
141 }