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1
64
65 package com.jcorporate.expresso.core.misc;
66
67 import com.jcorporate.expresso.core.dbobj.Schema;
68 import com.jcorporate.expresso.kernel.DataContext;
69 import com.jcorporate.expresso.kernel.ExpressoComponent;
70 import com.jcorporate.expresso.kernel.RootContainerInterface;
71 import com.jcorporate.expresso.kernel.management.ExpressoRuntimeMap;
72
73 import java.util.Iterator  ;
74
75
94
95 public class SchemaIterator implements Iterator {
96 DataContext context;
97 Schema next = null;
98 Iterator currentChild = null;
99
100
108 public SchemaIterator() {
109 RootContainerInterface expressoRuntime = ExpressoRuntimeMap.getDefaultRuntime();
110 if (expressoRuntime == null) {
111 throw new IllegalStateException ("No runtimes are in memory!");
112 }
113
114 ExpressoComponent ec = expressoRuntime.getContainerImplementation()
115 .locateComponent("default");
116
117 if (ec == null) {
118 throw new IllegalStateException ("No default data context defined in the default runtime.");
119 }
120
121 if (!(ec instanceof DataContext)) {
122 throw new IllegalStateException ("Component " + ec.getClass().getName()
123 + " is not of type DataContext");
124 }
125
126 context = (DataContext) ec;
127 initIterator();
128 }
129
130
137 public SchemaIterator(String runtime, String contextName) {
138 RootContainerInterface expressoRuntime = ExpressoRuntimeMap.getRuntime(runtime);
139 if (expressoRuntime == null) {
140 throw new IllegalArgumentException ("Cannot find runtime named: "
141 + runtime);
142 }
143
144 ExpressoComponent ec = expressoRuntime.getContainerImplementation()
145 .locateComponent(contextName);
146
147 if (ec == null) {
148 throw new IllegalArgumentException ("Cannot find context named: "
149 + contextName);
150 }
151
152 if (!(ec instanceof DataContext)) {
153 throw new IllegalArgumentException ("Component " + ec.getClass().getName()
154 + " is not of type DataContext");
155 }
156
157 context = (DataContext) ec;
158 initIterator();
159 }
160
161
168 public SchemaIterator(DataContext iteratingContext) {
169 if (iteratingContext == null) {
170 throw new IllegalArgumentException ("Parameter iterating Context must not be null");
171 }
172 context = iteratingContext;
173 initIterator();
174 }
175
176
182 public boolean hasNext() {
183 return (next != null) ? true : false;
184 }
185
186
192 public Object next() {
193 if (next == null) {
194 throw new java.lang.ArrayIndexOutOfBoundsException ("No more contexts");
195 }
196 Object returnValue = next;
197 findNext();
198 return returnValue;
199 }
200
201
208 public Schema nextContext() {
209 if (next == null) {
210 throw new java.lang.ArrayIndexOutOfBoundsException ("No more contexts");
211 }
212 Schema returnValue = next;
213 findNext();
214 return returnValue;
215 }
216
217
218
221 public void remove() {
222
223 throw new java.lang.UnsupportedOperationException ("Method remove() not yet implemented.");
224 }
225
226
230 private void initIterator() {
231 currentChild = context.getContainerImplementation()
232 .getChildComponents().values().iterator();
233 }
234
235
238 private void findNext() {
239 next = null;
240 while (currentChild.hasNext()) {
241 Object oneObj = currentChild.next();
242 if (oneObj instanceof Schema) {
243 next = (Schema) oneObj;
244 break;
245 }
246 }
247
248 }
249 } |
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