Source Code Cross Referenced for AggregateField.java in  » Web-Framework » cocoon » org » apache » cocoon » forms » formmodel » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Web Framework » cocoon » org.apache.cocoon.forms.formmodel 
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.formmodel;
018:
019:        import java.util.ArrayList;
020:        import java.util.HashMap;
021:        import java.util.Iterator;
022:        import java.util.List;
023:        import java.util.Map;
024:
025:        import org.apache.excalibur.xml.sax.XMLizable;
026:
027:        import org.apache.cocoon.forms.FormContext;
028:        import org.apache.cocoon.forms.FormsConstants;
029:        import org.apache.cocoon.forms.formmodel.AggregateFieldDefinition.SplitMapping;
030:        import org.apache.cocoon.forms.util.I18nMessage;
031:        import org.apache.cocoon.forms.validation.ValidationError;
032:
033:        import org.apache.oro.text.regex.MatchResult;
034:        import org.apache.oro.text.regex.PatternMatcher;
035:        import org.apache.oro.text.regex.Perl5Matcher;
036:        import org.outerj.expression.ExpressionException;
037:
038:        /**
039:         * An aggregated field allows to represent one value as multiple input fields, or several values
040:         * as one field. Hence this widget is a field and a container widget simultaneously.
041:         *
042:         * <p>Upon submit, it first attempts to read own value from the request, and splits over nested
043:         * field widgets using a regular expression. If split fails, this will simply give a validation error.
044:         * If own value was not submitted, it attempts to read values for nested field widgets, and combines
045:         * theirs values using combine expression.
046:         *
047:         * <p>To validate this widget, both the validation rules of the nested widgets are
048:         * checked, and those of the aggregated field themselves. The validation rules of the aggregated
049:         * field can perform checks on the string as entered by the user (e.g. check its total length).
050:         *
051:         * <p>This field and nested fields can be of any supported type, as long as combine expression
052:         * gives result of the correct type, and split regular expression can split string representation
053:         * into parts which can be converted to the values of nested fields.
054:         *
055:         * @version $Id: AggregateField.java 462520 2006-10-10 19:39:14Z vgritsenko $
056:         */
057:        public class AggregateField extends Field implements  ContainerWidget {
058:
059:            private static final String AGGREGATEFIELD_EL = "aggregatefield";
060:
061:            /**
062:             * List of nested fields
063:             */
064:            private List fields = new ArrayList();
065:
066:            /**
067:             * Map of nested fields
068:             */
069:            private Map fieldsById = new HashMap();
070:
071:            public AggregateField(AggregateFieldDefinition definition) {
072:                super (definition);
073:            }
074:
075:            public final AggregateFieldDefinition getAggregateFieldDefinition() {
076:                return (AggregateFieldDefinition) getDefinition();
077:            }
078:
079:            public void initialize() {
080:                this .selectionList = getAggregateFieldDefinition()
081:                        .getSelectionList();
082:
083:                Iterator it = this .getChildren();
084:                while (it.hasNext()) {
085:                    ((Widget) it.next()).initialize();
086:                }
087:            }
088:
089:            public void addChild(Widget widget) {
090:                if (!(widget instanceof  Field)) {
091:                    throw new IllegalArgumentException(
092:                            "AggregateField can only contain fields.");
093:                }
094:                addField((Field) widget);
095:            }
096:
097:            protected void addField(Field field) {
098:                field.setParent(this );
099:                fields.add(field);
100:                fieldsById.put(field.getId(), field);
101:            }
102:
103:            public boolean hasChild(String id) {
104:                return this .fieldsById.containsKey(id);
105:            }
106:
107:            public Iterator getChildren() {
108:                return fields.iterator();
109:            }
110:
111:            public void readFromRequest(FormContext formContext) {
112:                if (!getCombinedState().isAcceptingInputs()) {
113:                    return;
114:                }
115:
116:                String newEnteredValue = formContext.getRequest().getParameter(
117:                        getRequestParameterName());
118:                if (newEnteredValue != null) {
119:                    // There is one aggregated entered value. Read it and split it.
120:                    super .readFromRequest(formContext);
121:                    if (this .valueState == VALUE_UNPARSED) {
122:                        setFieldsValues(enteredValue);
123:                    }
124:                } else {
125:                    // Check if there are multiple splitted values. Read them and aggregate them.
126:                    for (Iterator i = fields.iterator(); i.hasNext();) {
127:                        Field field = (Field) i.next();
128:                        field.readFromRequest(formContext);
129:                        if (field.valueState == VALUE_UNPARSED) {
130:                            this .valueState = VALUE_UNPARSED;
131:                        }
132:                    }
133:                    if (this .valueState == VALUE_UNPARSED) {
134:                        combineFields();
135:                    }
136:                }
137:            }
138:
139:            public void setValue(Object newValue) {
140:                super .setValue(newValue);
141:                if (this .valueState == VALUE_PARSED) {
142:                    setFieldsValues(enteredValue);
143:                }
144:            }
145:
146:            /**
147:             * Returns false if all fields have no value.
148:             */
149:            private boolean fieldsHaveValues() {
150:                for (Iterator i = fields.iterator(); i.hasNext();) {
151:                    Field field = (Field) i.next();
152:                    if (field.getValue() != null) {
153:                        return true;
154:                    }
155:                }
156:                return false;
157:            }
158:
159:            /**
160:             * Splits passed value and sets values of all nested fields.
161:             * If split fails, resets all fields.
162:             */
163:            private void setFieldsValues(String value) {
164:                if (value == null) {
165:                    resetFieldsValues();
166:                } else {
167:                    PatternMatcher matcher = new Perl5Matcher();
168:                    if (matcher.matches(value, getAggregateFieldDefinition()
169:                            .getSplitPattern())) {
170:                        MatchResult matchResult = matcher.getMatch();
171:                        Iterator iterator = getAggregateFieldDefinition()
172:                                .getSplitMappingsIterator();
173:                        while (iterator.hasNext()) {
174:                            SplitMapping splitMapping = (SplitMapping) iterator
175:                                    .next();
176:                            String result = matchResult.group(splitMapping
177:                                    .getGroup());
178:
179:                            // Fields can have a non-string datatype, going to the readFromRequest
180:                            Field field = (Field) fieldsById.get(splitMapping
181:                                    .getFieldId());
182:                            field.readFromRequest(result);
183:                        }
184:                    } else {
185:                        resetFieldsValues();
186:                    }
187:                }
188:            }
189:
190:            public void combineFields() {
191:                try {
192:                    Object value = getAggregateFieldDefinition()
193:                            .getCombineExpression().evaluate(
194:                                    new ExpressionContextImpl(this , true));
195:                    super .setValue(value);
196:                } catch (CannotYetResolveWarning e) {
197:                    super .setValue(null);
198:                } catch (ExpressionException e) {
199:                    super .setValue(null);
200:                } catch (ClassCastException e) {
201:                    super .setValue(null);
202:                }
203:            }
204:
205:            /**
206:             * Sets values of all nested fields to null
207:             */
208:            private void resetFieldsValues() {
209:                for (Iterator i = fields.iterator(); i.hasNext();) {
210:                    Field field = (Field) i.next();
211:                    field.setValue(null);
212:                }
213:            }
214:
215:            public boolean validate() {
216:                if (!getCombinedState().isValidatingValues()) {
217:                    this .wasValid = true;
218:                    return true;
219:                }
220:
221:                if (enteredValue != null && !fieldsHaveValues()) {
222:                    XMLizable failMessage = getAggregateFieldDefinition()
223:                            .getSplitFailMessage();
224:                    if (failMessage != null) {
225:                        validationError = new ValidationError(failMessage);
226:                    } else {
227:                        validationError = new ValidationError(new I18nMessage(
228:                                "aggregatedfield.split-failed",
229:                                new String[] { getAggregateFieldDefinition()
230:                                        .getSplitRegexp() },
231:                                FormsConstants.I18N_CATALOGUE));
232:                    }
233:                    valueState = VALUE_DISPLAY_VALIDATION;
234:                    this .wasValid = false;
235:                    return false;
236:                }
237:
238:                // Validate ALL my child fields
239:                boolean valid = true;
240:                for (Iterator i = fields.iterator(); i.hasNext();) {
241:                    Field field = (Field) i.next();
242:                    if (!field.validate()) {
243:                        validationError = field.getValidationError();
244:                        valid = false;
245:                    }
246:                }
247:                if (!valid) {
248:                    valueState = VALUE_DISPLAY_VALIDATION;
249:                    this .wasValid = false;
250:                    return false;
251:                }
252:
253:                return super .validate();
254:            }
255:
256:            /**
257:             * @return "aggregatefield"
258:             */
259:            public String getXMLElementName() {
260:                return AGGREGATEFIELD_EL;
261:            }
262:
263:            public Widget getChild(String id) {
264:                return (Widget) fieldsById.get(id);
265:            }
266:        }
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