1 /**
2 * Copyright 2005-2013 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 org.kuali.rice.krad.uif.view.View;
19 import org.kuali.rice.krad.uif.component.Component;
20 import org.kuali.rice.krad.uif.component.Configurable;
21 import org.kuali.rice.krad.uif.component.Ordered;
22
23 import java.io.Serializable;
24 import java.util.List;
25 import java.util.Set;
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 Configurable, 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 view - View instance the component modifier is a part of
69 * @parma model - object instance containing the view data
70 * @param component - Component the modifier is configured on
71 * @see org.kuali.rice.krad.uif.service.ViewHelperService#performInitialization
72 */
73 public void performInitialization(View view, Object model, Component component);
74
75 /**
76 * Invoked within the configured phase of the component lifecycle. This is
77 * where the <code>ComponentModifier</code> should perform its work against
78 * the given <code>Component</code> instance
79 *
80 * @param view - the view instance to which the component belongs
81 * @param model - top level object containing the view data
82 * @param component - the component instance to modify
83 * @see org.kuali.rice.krad.uif.modifier.ComponentModifier#performModification
84 * (View, Object, Component)
85 */
86 public void performModification(View view, Object model, Component component);
87
88 /**
89 * <code>Set</code> of <code>Component</code> classes that may be sent to
90 * the modifier
91 *
92 * <p>
93 * If an empty or null list is returned, it is assumed the modifier supports
94 * all components. The returned set will be used by the dictionary
95 * validation
96 * </p>
97 *
98 * @return Set component classes
99 */
100 public Set<Class<? extends Component>> getSupportedComponents();
101
102 /**
103 * List of components that are maintained by the modifier as prototypes for creating other component instances
104 *
105 * <p>
106 * Prototypes are held for configuring how a component should be created during the lifecycle. An example of this
107 * are the fields in a collection group that are created for each collection record. They only participate in the
108 * initialize phase.
109 * </p>
110 *
111 * @return List<Component> child component prototypes
112 */
113 public List<Component> getComponentPrototypes();
114
115 /**
116 * Indicates what phase of the component lifecycle the
117 * <code>ComponentModifier</code> should be invoked in (INITIALIZE,
118 * APPLY_MODEL, or FINALIZE)
119 *
120 * @return String view lifecycle phase
121 * @see org.kuali.rice.krad.uif.UifConstants.ViewPhases
122 */
123 public String getRunPhase();
124
125 /**
126 * Conditional expression to evaluate for determining whether the component
127 * modifier should be run. If the expression evaluates to true the modifier
128 * will be executed, otherwise it will not be executed
129 *
130 * @return String el expression that should evaluate to boolean
131 */
132 public String getRunCondition();
133
134 /**
135 * @see org.springframework.core.Ordered#getOrder()
136 */
137 public int getOrder();
138
139 /**
140 * @see org.kuali.rice.krad.uif.component.Ordered#setOrder(int)
141 */
142 public void setOrder(int order);
143
144 }