/*
* (C) Copyright 2006-2008 Nuxeo SA (http://nuxeo.com/) and others.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Contributors:
* bstefanescu
*/
package org.nuxeo.ecm.webengine.forms.validation;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.Hashtable;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.nuxeo.ecm.webengine.WebEngine;
import org.nuxeo.ecm.webengine.forms.FormDataProvider;
import org.nuxeo.runtime.api.Framework;
/**
* @author <a href="mailto:bs@nuxeo.com">Bogdan Stefanescu</a>
*/
public class FormManager implements InvocationHandler, Form {
protected Map<String, Object> map;
protected Map<String, String[]> fields;
protected List<String> unknownKeys;
protected FormDescriptor fd;
public FormManager(FormDescriptor fd) {
this.fd = fd;
unknownKeys = new ArrayList<String>();
map = new HashMap<String, Object>(); // remove any previous data
fields = new HashMap<String, String[]>(); // remove any previous data
// TODO when implementing file upload - remove here any previously created file
}
public Collection<String> unknownKeys() {
return unknownKeys;
}
public Map<String, String[]> fields() {
return fields;
}
@SuppressWarnings("unchecked")
public void load(FormDataProvider data, Form proxy) throws ValidationException {
ValidationException ve = null;
Set<String> reqs = (Set<String>) fd.requiredFields.clone();
for (String key : data.getKeys()) {
String[] values = data.getList(key);
if (values != null) {
int k = 0;
for (String v : values) {
if (v.length() == 0) {
k++;
}
}
if (k == values.length) {
values = null;
}
}
if (values != null) {
fields.put(key, values);
reqs.remove(key);
}
FormDescriptor.Field f = fd.fields.get(key);
if (f != null) {
Object o = null;
try {
if (f.isArray) {
if (values != null) {
o = f.validateArray(values);
}
} else {
String v = values != null && values.length > 0 ? values[0] : null;
if (v != null && v.length() > 0) {
o = f.validate(v);
}
}
} catch (ValidationException e) {
if (ve == null) {
ve = e;
}
ve.addInvalidField(key);
}
map.put(key, o);
} else {
unknownKeys.add(key);
}
}
if (!reqs.isEmpty()) {
if (ve == null) {
ve = new ValidationException();
}
for (String req : reqs) {
ve.addRequiredField(req);
}
}
if (ve != null) {
throw ve;
}
if (fd.validator != null) {
fd.validator.validate(data, proxy);
}
}
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
if (method.getDeclaringClass() == Form.class) {
try {
return method.invoke(this, args);
} catch (InvocationTargetException e) {
throw e.getCause();
}
} else {
String name = method.getName();
int len = name.length();
if (len > 3) {
if (name.startsWith("get")) {
name = FormDescriptor.getFieldName(name, len);
return map.get(name);
}
}
}
throw new UnsupportedOperationException("Method unsupported: " + method);
}
protected static Map<Class<?>, FormDescriptor> forms = new Hashtable<Class<?>, FormDescriptor>();
@SuppressWarnings("unchecked")
public static <T> T newProxy(Class<T> type) {
WebEngine we = Framework.getService(WebEngine.class);
ClassLoader cl = we != null ? we.getWebLoader().getClassLoader() : FormManager.class.getClassLoader();
return (T) Proxy.newProxyInstance(cl, new Class<?>[] { type }, new FormManager(getDescriptor(type)));
}
public void flushCache() {
forms = new Hashtable<Class<?>, FormDescriptor>();
}
static FormDescriptor getDescriptor(Class<?> type) {
FormDescriptor fd = forms.get(type);
if (fd == null) {
try {
fd = new FormDescriptor(type);
forms.put(type, fd);
} catch (ReflectiveOperationException e) {
throw new RuntimeException("Failed to build form descriptor", e);
}
}
return fd;
}
}