Source Code Cross Referenced for CustomValueWrapBinding.java in  » Web-Framework » cocoon » org » apache » cocoon » forms » samples » bindings » 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.samples.bindings 
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.samples.bindings;
018:
019:        import org.apache.cocoon.forms.binding.AbstractCustomBinding;
020:        import org.apache.cocoon.forms.binding.Binding;
021:        import org.apache.cocoon.forms.binding.BindingException;
022:        import org.apache.cocoon.forms.formmodel.Widget;
023:        import org.apache.cocoon.forms.util.DomHelper;
024:        import org.apache.commons.jxpath.JXPathContext;
025:        import org.w3c.dom.Element;
026:
027:        /**
028:         * CustomValueWrapBinding
029:         */
030:        public class CustomValueWrapBinding extends AbstractCustomBinding {
031:
032:            private static final char DEFAULT_DELIMITER = '*';
033:            private final String prefix;
034:            private final String suffix;
035:
036:            public CustomValueWrapBinding() {
037:                this (DEFAULT_DELIMITER);
038:            }
039:
040:            public CustomValueWrapBinding(char delimiter) {
041:                this (delimiter, delimiter);
042:            }
043:
044:            public CustomValueWrapBinding(char prefix, char suffix) {
045:                this .prefix = "" + prefix + prefix;
046:                this .suffix = "" + suffix + suffix;
047:            }
048:
049:            /**
050:             * This unwraps the value from the model by removing the 2 prefix and suffix-chars 
051:             * before setting it onto the model
052:             * 
053:             * Method signature and semantics complies to {@link AbstractCustomBinding#doLoad(Widget, JXPathContext)}
054:             */
055:            public void doLoad(Widget frmModel, JXPathContext jxpc)
056:                    throws BindingException {
057:                String appValue = (String) jxpc.getValue(getXpath());
058:                String formValue = null;
059:                if (appValue.startsWith(this .prefix)
060:                        && appValue.endsWith(suffix)
061:                        && appValue.length() >= this .prefix.length()
062:                                + this .suffix.length()) {
063:                    formValue = appValue.substring(this .prefix.length(),
064:                            appValue.length() - this .suffix.length());
065:                }
066:                frmModel.setValue(formValue);
067:            }
068:
069:            /**
070:             * This wraps the value from the form between 2 prefix and suffix-chars 
071:             * before saving to the model 
072:             * 
073:             * Method signature and semantics complies to {@link AbstractCustomBinding#doSave(Widget, JXPathContext)}
074:             */
075:            public void doSave(Widget frmModel, JXPathContext jxpc)
076:                    throws BindingException {
077:                Object formValue = frmModel.getValue();
078:                jxpc.setValue(getXpath(), "" + this .prefix + formValue
079:                        + this .suffix);
080:            }
081:
082:            /** 
083:             * Builds the actual binding class based on its XML config.
084:             * 
085:             * @param config the {@link Element} holding the config for the binding to create.
086:             * @return the configured binding
087:             * @throws BindingException when the creation fails
088:             */
089:            public static Binding createBinding(Element config)
090:                    throws BindingException {
091:
092:                try {
093:                    String pfx = DomHelper.getAttribute(config, "prefixchar",
094:                            null);
095:                    String sfx = DomHelper.getAttribute(config, "suffixchar",
096:                            null);
097:
098:                    final char prefixChar = (pfx != null) ? pfx.charAt(0)
099:                            : DEFAULT_DELIMITER;
100:                    final char suffixChar = (sfx != null) ? sfx.charAt(0)
101:                            : DEFAULT_DELIMITER;
102:
103:                    return new CustomValueWrapBinding(prefixChar, suffixChar);
104:                } catch (Exception e) {
105:                    throw new BindingException(
106:                            "Could not create instance of CustomValueWrapBinding.",
107:                            e);
108:                }
109:            }
110:        }
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