Source Code Cross Referenced for TempRepeaterJXPathBinding.java in  » Content-Management-System » apache-lenya-2.0 » org » apache » cocoon » forms » binding » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Content Management System » apache lenya 2.0 » org.apache.cocoon.forms.binding 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Licensed to the Apache Software Foundation (ASF) under one or more
003:         * contributor license agreements.  See the NOTICE file distributed with
004:         * this work for additional information regarding copyright ownership.
005:         * The ASF licenses this file to You under the Apache License, Version 2.0
006:         * (the "License"); you may not use this file except in compliance with
007:         * the License.  You may obtain a copy of the License at
008:         *
009:         *      http://www.apache.org/licenses/LICENSE-2.0
010:         *
011:         * Unless required by applicable law or agreed to in writing, software
012:         * distributed under the License is distributed on an "AS IS" BASIS,
013:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014:         * See the License for the specific language governing permissions and
015:         * limitations under the License.
016:         */
017:        package org.apache.cocoon.forms.binding;
018:
019:        import java.util.Iterator;
020:
021:        import org.apache.avalon.framework.logger.Logger;
022:
023:        import org.apache.cocoon.forms.formmodel.Repeater;
024:        import org.apache.cocoon.forms.formmodel.Widget;
025:
026:        import org.apache.commons.jxpath.JXPathContext;
027:        import org.apache.commons.jxpath.Pointer;
028:        import org.w3c.dom.Document;
029:        import org.w3c.dom.Node;
030:        import org.w3c.dom.NodeList;
031:
032:        /**
033:         * Experimental simple binding for repeaters:
034:         *   on save, first deletes the target data before recreating it from scratch.
035:         * Based on code from SimpleRepeater.
036:         * <p>
037:         * For a smarter binding that avoids deletion and recreation, consider
038:         * {@link org.apache.cocoon.forms.binding.RepeaterJXPathBinding}
039:         *
040:         * @version $Id: TempRepeaterJXPathBinding.java 517733 2007-03-13 15:37:22Z vgritsenko $
041:         */
042:        public class TempRepeaterJXPathBinding extends JXPathBindingBase {
043:
044:            private final String repeaterId;
045:            private final String repeaterPath;
046:            private final String rowPath;
047:            private final String rowPathInsert;
048:            private final boolean clearOnLoad;
049:            private final JXPathBindingBase rowBinding;
050:            private final JXPathBindingBase insertRowBinding;
051:            private final boolean deleteIfEmpty;
052:            private final boolean virtualRows;
053:
054:            public TempRepeaterJXPathBinding(
055:                    JXPathBindingBuilderBase.CommonAttributes commonAtts,
056:                    String repeaterId, String repeaterPath, String rowPath,
057:                    String rowPathInsert, boolean virtualRows,
058:                    boolean clearOnLoad, boolean deleteIfEmpty,
059:                    JXPathBindingBase rowBinding,
060:                    JXPathBindingBase insertBinding) {
061:                super (commonAtts);
062:                this .repeaterId = repeaterId;
063:                this .repeaterPath = repeaterPath;
064:                this .rowPath = rowPath;
065:                this .rowPathInsert = rowPathInsert;
066:                this .rowBinding = rowBinding;
067:                this .rowBinding.setParent(this );
068:                this .insertRowBinding = insertBinding;
069:                this .insertRowBinding.setParent(this );
070:                this .virtualRows = virtualRows;
071:                this .clearOnLoad = clearOnLoad;
072:                this .deleteIfEmpty = deleteIfEmpty;
073:            }
074:
075:            public void enableLogging(Logger logger) {
076:                super .enableLogging(logger);
077:                if (this .insertRowBinding != null) {
078:                    this .insertRowBinding.enableLogging(logger);
079:                }
080:                this .rowBinding.enableLogging(logger);
081:            }
082:
083:            public String getId() {
084:                return repeaterId;
085:            }
086:
087:            public String getRepeaterPath() {
088:                return repeaterPath;
089:            }
090:
091:            public String getRowPath() {
092:                return rowPath;
093:            }
094:
095:            public String getRowPathInsert() {
096:                return rowPathInsert;
097:            }
098:
099:            public boolean getVirtualRows() {
100:                return virtualRows;
101:            }
102:
103:            public boolean getClearOnLoad() {
104:                return clearOnLoad;
105:            }
106:
107:            public boolean getDeleteIfEmpty() {
108:                return deleteIfEmpty;
109:            }
110:
111:            public JXPathBindingBase[] getChildBindings() {
112:                return ((ComposedJXPathBindingBase) rowBinding)
113:                        .getChildBindings();
114:            }
115:
116:            public JXPathBindingBase[] getInsertChildBindings() {
117:                return ((ComposedJXPathBindingBase) insertRowBinding)
118:                        .getChildBindings();
119:            }
120:
121:            public void doLoad(Widget frmModel, JXPathContext jctx)
122:                    throws BindingException {
123:                // (There should be a general widget type checker for all the bindings to use,
124:                // coupled with a general informative exception class to throw if the widget is
125:                // of the wrong type or null.)
126:                Repeater repeater = (Repeater) selectWidget(frmModel,
127:                        this .repeaterId);
128:                if (repeater == null) {
129:                    String fullId = frmModel.getRequestParameterName();
130:                    if (fullId == null || fullId.length() == 0) {
131:                        fullId = "";
132:                    } else {
133:                        fullId = fullId + ".";
134:                    }
135:                    throw new RuntimeException(
136:                            "TempRepeaterJXPathBinding: Repeater \"" + fullId
137:                                    + this .repeaterId + "\" does not exist ("
138:                                    + frmModel.getLocation() + ")");
139:                }
140:
141:                // Start by clearing the repeater, if necessary.
142:                if (this .clearOnLoad) {
143:                    repeater.clear();
144:                }
145:
146:                // Find the location of the repeater data.
147:                Pointer repeaterPointer = jctx.getPointer(this .repeaterPath);
148:
149:                // Check if there is data present.
150:                //
151:                // (Otherwise, should we check the leniency config option
152:                // to decide whether to be silent or throw an exception?)
153:                if (repeaterPointer != null) {
154:
155:                    // Narrow to repeater context.
156:                    JXPathContext repeaterContext = jctx
157:                            .getRelativeContext(repeaterPointer);
158:
159:                    // Build a jxpath iterator for the repeater row pointers.
160:                    Iterator rowPointers = repeaterContext
161:                            .iteratePointers(this .rowPath);
162:
163:                    // Iterate through the rows of data.
164:                    int rowNum = 0;
165:                    while (rowPointers.hasNext()) {
166:
167:                        // Get or create a row widget.
168:                        Repeater.RepeaterRow this Row;
169:                        if (repeater.getSize() > rowNum) {
170:                            this Row = repeater.getRow(rowNum);
171:                        } else {
172:                            this Row = repeater.addRow();
173:                        }
174:                        rowNum++;
175:
176:                        // Narrow to the row context.
177:                        Pointer rowPointer = (Pointer) rowPointers.next();
178:                        JXPathContext rowContext = repeaterContext
179:                                .getRelativeContext(rowPointer);
180:
181:                        // If virtual rows are requested, place a deep clone of the row data
182:                        // into a temporary node, and narrow the context to this virtual row.
183:                        //
184:                        // (A clone of the data is used to prevent modifying the source document.
185:                        // Otherwise, the appendChild method would remove the data from the source
186:                        // document.  Is this protection worth the penalty of a deep clone?)
187:                        //
188:                        // (This implementation of virtual rows currently only supports DOM
189:                        // bindings, but could easily be extended to support other bindings.)
190:
191:                        if (virtualRows) {
192:                            Node repeaterNode = (Node) repeaterPointer
193:                                    .getNode();
194:                            Node virtualNode = repeaterNode.getOwnerDocument()
195:                                    .createElementNS(null, "virtual");
196:                            Node node = (Node) rowPointer.getNode();
197:                            Node clone = node.cloneNode(true);
198:                            Node fakeDocElement = node.getOwnerDocument()
199:                                    .getDocumentElement().cloneNode(false);
200:                            virtualNode.appendChild(clone);
201:                            fakeDocElement.appendChild(virtualNode);
202:                            rowContext = JXPathContext.newContext(
203:                                    repeaterContext, fakeDocElement);
204:                            rowContext = rowContext
205:                                    .getRelativeContext(rowContext
206:                                            .getPointer("virtual"));
207:                        }
208:
209:                        // Finally, perform the load row binding.
210:                        this .rowBinding.loadFormFromModel(this Row, rowContext);
211:                    }
212:                }
213:
214:                if (getLogger().isDebugEnabled())
215:                    getLogger().debug("done loading rows " + this );
216:            }
217:
218:            public void doSave(Widget frmModel, JXPathContext jctx)
219:                    throws BindingException {
220:                // (See comment in doLoad about type checking and throwing a meaningful exception.)
221:                Repeater repeater = (Repeater) selectWidget(frmModel,
222:                        this .repeaterId);
223:
224:                // Perform shortcut binding if the repeater is empty
225:                // and the deleteIfEmpty config option is selected.
226:                if (repeater.getSize() == 0 && this .deleteIfEmpty) {
227:                    // Delete all of the old data for this repeater.
228:                    jctx.removeAll(this .repeaterPath);
229:
230:                    // Otherwise perform the normal save binding.
231:                } else {
232:
233:                    // Narrow to the repeater context, creating the path if it did not exist.
234:                    JXPathContext repeaterContext = jctx
235:                            .getRelativeContext(jctx
236:                                    .createPath(this .repeaterPath));
237:
238:                    // Start by deleting all of the old row data.
239:                    repeaterContext.removeAll(this .rowPath);
240:
241:                    // Verify that repeater is not empty and has an insert row binding.
242:                    if (repeater.getSize() > 0) {
243:                        if (this .insertRowBinding != null) {
244:
245:                            //register the factory!
246:                            //this.insertRowBinding.saveFormToModel(repeater, repeaterContext);
247:
248:                            // Iterate through the repeater rows.
249:                            for (int i = 0; i < repeater.getSize(); i++) {
250:
251:                                // Narrow to the repeater row context.
252:                                Pointer rowPointer = repeaterContext
253:                                        .getPointer(this .rowPathInsert);
254:                                JXPathContext rowContext = repeaterContext
255:                                        .getRelativeContext(rowPointer);
256:
257:                                // Variables used for virtual rows.
258:                                // They are initialized here just to keep the compiler happy.
259:                                Node rowNode = null;
260:                                Node virtualNode = null;
261:
262:                                // If virtual rows are requested, create a temporary node and
263:                                // narrow the context to this initially empty new virtual row.
264:                                if (virtualRows) {
265:                                    rowNode = (Node) rowContext
266:                                            .getContextBean();
267:                                    Document document = rowNode
268:                                            .getOwnerDocument();
269:                                    virtualNode = document.createElementNS(
270:                                            null, "virtual");
271:                                    Node fakeDocElement = document
272:                                            .getDocumentElement().cloneNode(
273:                                                    false);
274:                                    fakeDocElement.appendChild(virtualNode);
275:                                    rowContext = JXPathContext.newContext(
276:                                            repeaterContext, fakeDocElement);
277:                                    rowContext = rowContext
278:                                            .getRelativeContext(rowContext
279:                                                    .getPointer("virtual"));
280:                                }
281:
282:                                // Perform the insert row binding
283:                                this .insertRowBinding.saveFormToModel(repeater,
284:                                        rowContext);
285:
286:                                // Perform the save row binding.
287:                                this .rowBinding.saveFormToModel(repeater
288:                                        .getRow(i), rowContext);
289:
290:                                // If virtual rows are requested, finish by appending the
291:                                // children of the virtual row to the real context node.
292:                                if (virtualRows) {
293:                                    NodeList list = virtualNode.getChildNodes();
294:                                    int count = list.getLength();
295:                                    for (int j = 0; j < count; j++) {
296:                                        // The list shrinks when a child is appended to the context
297:                                        // node, so we always reference the first child in the list.
298:                                        rowNode.appendChild(list.item(0));
299:                                    }
300:                                }
301:                                getLogger().debug("bound new row");
302:                            }
303:                        } else {
304:                            getLogger()
305:                                    .warn(
306:                                            "TempRepeaterBinding has detected rows to insert, "
307:                                                    + "but misses the <on-insert-row> binding to do it.");
308:                        }
309:                    }
310:                }
311:            }
312:
313:            public String toString() {
314:                return "TempRepeaterJXPathBinding [widget=" + this .repeaterId
315:                        + ", xpath=" + this .repeaterPath + "]";
316:            }
317:        }
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