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24 package org.riotfamily.riot.list.command.core;
25
26 import javax.servlet.http.HttpSession  ;
27
28 import org.riotfamily.riot.dao.CopyAndPasteEnabledDao;
29 import org.riotfamily.riot.dao.CutAndPasteEnabledDao;
30 import org.riotfamily.riot.dao.RiotDao;
31 import org.riotfamily.riot.editor.EditorDefinitionUtils;
32 import org.riotfamily.riot.editor.ListDefinition;
33 import org.riotfamily.riot.editor.ui.EditorReference;
34 import org.riotfamily.riot.list.command.CommandContext;
35 import org.springframework.util.ObjectUtils;
36 import org.springframework.web.util.WebUtils;
37
38 public class Clipboard {
39
40 public static final int MODE_EMPTY = 0;
41
42 public static final int MODE_COPY = 1;
43
44 public static final int MODE_CUT = 2;
45
46 private static final String SESSION_ATTRIBUTE = Clipboard.class.getName();
47
48 private int mode;
49
50 private String objectId;
51
52 private String parentId;
53
54 private ListDefinition listDefinition;
55
56 public static Clipboard get(CommandContext context) {
57 return get(context.getRequest().getSession());
58 }
59
60 public static Clipboard get(HttpSession session) {
61 return (Clipboard) WebUtils.getOrCreateSessionAttribute(
62 session, SESSION_ATTRIBUTE, Clipboard.class);
63 }
64
65 public void cut(CommandContext context) {
66 put(context, MODE_CUT);
67 }
68
69 public void copy(CommandContext context) {
70 put(context, MODE_COPY);
71 }
72
73 private void put(CommandContext context, int mode) {
74 this.mode = mode;
75 objectId = context.getObjectId();
76 parentId = context.getParentId();
77 listDefinition = context.getListDefinition();
78 }
79
80 public void clear() {
81 mode = MODE_EMPTY;
82 objectId = null;
83 parentId = null;
84 listDefinition = null;
85 }
86
87 public boolean isEmpty() {
88 return mode == MODE_EMPTY;
89 }
90
91 public Object getObject() {
92 if (!isEmpty()) {
93 return listDefinition.getListConfig().getDao().load(objectId);
94 }
95 return null;
96 }
97
98
99 public boolean canCopy(CommandContext context) {
100 return context.getDao() instanceof CopyAndPasteEnabledDao;
101 }
102
103 public boolean canCut(CommandContext context) {
104 return context.getDao() instanceof CutAndPasteEnabledDao
105 && !isCut(context);
106 }
107
108 public boolean canPaste(CommandContext context) {
109 return !isEmpty()
110 && isSupportedDao(context)
111 && isCompatibleEntityClass(context)
112 && (mode == MODE_COPY || !isSameParent(context))
113 && !isCutObjectAncestor(context);
114 }
115
116 public void paste(CommandContext context) {
117 if (mode == MODE_CUT) {
118 pasteCut(context);
119 }
120 else if (mode == MODE_COPY) {
121 pasteCopied(context);
122 }
123 clear();
124 }
125
126 private void pasteCut(CommandContext context) {
127 CutAndPasteEnabledDao dao = (CutAndPasteEnabledDao) context.getDao();
128 Object item = dao.load(objectId);
129 Object parent = context.getBean();
130 dao.addChild(item, parent);
131 if (parentId != null) {
132 Object previousParent = EditorDefinitionUtils.loadParent(
133 listDefinition, parentId);
134
135 CutAndPasteEnabledDao previousDao = (CutAndPasteEnabledDao)
136 listDefinition.getListConfig().getDao();
137
138 previousDao.removeChild(item, previousParent);
139 }
140 }
141
142 private void pasteCopied(CommandContext context) {
143 CopyAndPasteEnabledDao dao = (CopyAndPasteEnabledDao) context.getDao();
144 Object item = dao.load(objectId);
145 Object parent = context.getBean();
146 dao.addCopy(item, parent);
147 }
148
149
150 public boolean isCut(CommandContext context) {
151 return mode == MODE_CUT && ObjectUtils.nullSafeEquals(
152 objectId, context.getObjectId());
153 }
154
155 public boolean isCopied(CommandContext context) {
156 return mode == MODE_COPY && ObjectUtils.nullSafeEquals(
157 objectId, context.getObjectId());
158 }
159
160 private boolean isSameParent(CommandContext context) {
161 return ObjectUtils.nullSafeEquals(parentId, context.getParentId());
162 }
163
164 private boolean isCutObjectAncestor(CommandContext context) {
165 if (mode == MODE_CUT) {
166 EditorReference ref = context.getListDefinition().createEditorPath(
167 null, context.getParentId(),
168 context.getMessageResolver()).getParent();
169
170 while (ref != null) {
171 if (objectId.equals(ref.getObjectId())) {
172 return true;
173 }
174 ref = ref.getParent();
175 }
176 }
177 return false;
178 }
179
180 private boolean isSupportedDao(CommandContext context) {
181 RiotDao dao = context.getDao();
182 return (mode == MODE_CUT && dao instanceof CutAndPasteEnabledDao)
183 || (mode == MODE_COPY && dao instanceof CopyAndPasteEnabledDao);
184 }
185
186 private boolean isCompatibleEntityClass(CommandContext context) {
187 RiotDao sourceDao = listDefinition.getListConfig().getDao();
188 RiotDao dao = context.getDao();
189 return dao.getEntityClass().equals(sourceDao.getEntityClass());
190 }
191
192 }
193 |
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