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play.data.binding.Binder Maven / Gradle / Ivy
package play.data.binding;
import org.apache.commons.lang.StringUtils;
import org.joda.time.DateTime;
import play.Logger;
import play.Play;
import play.data.Upload;
import play.data.binding.types.*;
import play.data.validation.Validation;
import play.db.Model;
import play.exceptions.UnexpectedException;
import java.io.File;
import java.lang.annotation.Annotation;
import java.lang.reflect.Array;
import java.lang.reflect.Method;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.math.BigDecimal;
import java.util.*;
/**
* The binder try to convert String values to Java objects.
*/
public abstract class Binder {
public final static Object MISSING = new Object();
private final static Object DIRECTBINDING_NO_RESULT = new Object();
public final static Object NO_BINDING = new Object();
static final Map, TypeBinder> supportedTypes = new HashMap, TypeBinder>();
// TODO: something a bit more dynamic? The As annotation allows you to inject your own binder
static {
supportedTypes.put(Date.class, new DateBinder());
supportedTypes.put(DateTime.class, new DateTimeBinder());
supportedTypes.put(File.class, new FileBinder());
supportedTypes.put(File[].class, new FileArrayBinder());
supportedTypes.put(Model.BinaryField.class, new BinaryBinder());
supportedTypes.put(Upload.class, new UploadBinder());
supportedTypes.put(Upload[].class, new UploadArrayBinder());
supportedTypes.put(Calendar.class, new CalendarBinder());
supportedTypes.put(Locale.class, new LocaleBinder());
supportedTypes.put(byte[].class, new ByteArrayBinder());
supportedTypes.put(byte[][].class, new ByteArrayArrayBinder());
}
public static void register(Class clazz, TypeBinder typeBinder) {
supportedTypes.put(clazz, typeBinder);
}
static Map, BeanWrapper> beanwrappers = new HashMap, BeanWrapper>();
static BeanWrapper getBeanWrapper(Class clazz) {
if (!beanwrappers.containsKey(clazz)) {
BeanWrapper beanwrapper = new BeanWrapper(clazz);
beanwrappers.put(clazz, beanwrapper);
}
return beanwrappers.get(clazz);
}
public static class MethodAndParamInfo {
public final Object objectInstance;
public final Method method;
public int parameterIndex;
public MethodAndParamInfo(Object objectInstance, Method method, int parameterIndex) {
this.objectInstance = objectInstance;
this.method = method;
this.parameterIndex = parameterIndex;
}
}
/**
* Deprecated. Use bindBean() instead.
*/
@Deprecated
public static Object bind(Object o, String name, Map params) {
RootParamNode parentParamNode = RootParamNode.convert(params);
Binder.bindBean(parentParamNode, name, o);
return o;
}
@Deprecated
public static Object bind(String name, Class clazz, Type type, Annotation[] annotations, Map params) {
RootParamNode parentParamNode = RootParamNode.convert(params);
return bind(parentParamNode, name, clazz, type, annotations);
}
public static Object bind(RootParamNode parentParamNode, String name, Class clazz, Type type, Annotation[] annotations) {
return bind(parentParamNode, name, clazz, type, annotations, null);
}
public static Object bind(RootParamNode parentParamNode, String name, Class clazz, Type type, Annotation[] annotations, MethodAndParamInfo methodAndParamInfo) {
final ParamNode paramNode = parentParamNode.getChild(name, true);
Object result = null;
if (paramNode == null) {
result = MISSING;
}
final BindingAnnotations bindingAnnotations = new BindingAnnotations(annotations);
if (bindingAnnotations.checkNoBinding()) {
return NO_BINDING;
}
if (paramNode != null) {
// Let a chance to plugins to bind this object
result = Play.pluginCollection.bind(parentParamNode, name, clazz, type, annotations);
if (result != null) {
return result;
}
result = internalBind(paramNode, clazz, type, bindingAnnotations);
}
if (result == MISSING) {
// Try the scala default
if (methodAndParamInfo != null) {
try {
Method method = methodAndParamInfo.method;
Method defaultMethod = method.getDeclaringClass().getDeclaredMethod(method.getName() + "$default$" + methodAndParamInfo.parameterIndex);
return defaultMethod.invoke(methodAndParamInfo.objectInstance);
} catch (NoSuchMethodException e) {
//
} catch (Exception e) {
throw new UnexpectedException(e);
}
}
if (clazz.equals(boolean.class)) {
return false;
}
if (clazz.equals(int.class)) {
return 0;
}
if (clazz.equals(long.class)) {
return 0;
}
if (clazz.equals(double.class)) {
return 0;
}
if (clazz.equals(short.class)) {
return 0;
}
if (clazz.equals(byte.class)) {
return 0;
}
if (clazz.equals(char.class)) {
return ' ';
}
return null;
}
return result;
}
protected static Object internalBind(ParamNode paramNode, Class clazz, Type type, BindingAnnotations bindingAnnotations) {
if (paramNode == null) {
return MISSING;
}
if (paramNode.getValues() == null && paramNode.getAllChildren().size() == 0) {
return MISSING;
}
if (bindingAnnotations.checkNoBinding()) {
return NO_BINDING;
}
try {
if (Enum.class.isAssignableFrom(clazz)) {
return bindEnum(clazz, paramNode);
}
if (Map.class.isAssignableFrom(clazz)) {
return bindMap(clazz, type, paramNode, bindingAnnotations);
}
if (Collection.class.isAssignableFrom(clazz)) {
return bindCollection(clazz, type, paramNode, bindingAnnotations);
}
Object directBindResult = internalDirectBind(paramNode.getOriginalKey(), bindingAnnotations.annotations, paramNode.getFirstValue(clazz), clazz, type);
if (directBindResult != DIRECTBINDING_NO_RESULT) {
// we found a value/result when direct binding
return directBindResult;
}
// Must do the default array-check after direct binding, since some custom-binders checks for specific arrays
if (clazz.isArray()) {
return bindArray(clazz, paramNode, bindingAnnotations);
}
if (!paramNode.getAllChildren().isEmpty()) {
return internalBindBean(clazz, paramNode, bindingAnnotations);
}
return null; // give up
} catch (Exception e) {
Validation.addError(paramNode.getOriginalKey(), "validation.invalid");
}
return MISSING;
}
private static Object bindArray(Class clazz, ParamNode paramNode, BindingAnnotations bindingAnnotations) {
Class componentType = clazz.getComponentType();
int invalidItemsCount = 0;
int size;
Object array;
String[] values = paramNode.getValues();
if (values != null) {
if (bindingAnnotations.annotations != null) {
for (Annotation annotation : bindingAnnotations.annotations) {
if (annotation.annotationType().equals(As.class)) {
As as = ((As) annotation);
final String separator = as.value()[0];
values = values[0].split(separator);
}
}
}
size = values.length;
array = Array.newInstance(componentType, size);
for (int i = 0; i < size; i++) {
String thisValue = values[i];
try {
Array.set(array, i - invalidItemsCount, directBind(paramNode.getOriginalKey(), bindingAnnotations.annotations, thisValue, componentType, componentType));
} catch (Exception e) {
// bad item..
invalidItemsCount++;
}
}
} else {
size = paramNode.getAllChildren().size();
array = Array.newInstance(componentType, size);
int i = 0;
for (ParamNode child : paramNode.getAllChildren()) {
Object childValue = internalBind(child, componentType, componentType, bindingAnnotations);
if (childValue != NO_BINDING && childValue != MISSING) {
try {
Array.set(array, i - invalidItemsCount, childValue);
} catch (Exception e) {
// bad item..
invalidItemsCount++;
}
}
i++;
}
}
if (invalidItemsCount > 0) {
// must remove some elements from the end..
int newSize = size - invalidItemsCount;
Object newArray = Array.newInstance(componentType, newSize);
for (int i = 0; i < newSize; i++) {
Array.set(newArray, i, Array.get(array, i));
}
array = newArray;
}
return array;
}
private static Object internalBindBean(Class clazz, ParamNode paramNode, BindingAnnotations bindingAnnotations) throws Exception {
Object bean = clazz.newInstance();
internalBindBean(paramNode, bean, bindingAnnotations);
return bean;
}
/**
* Invokes the plugins before using the internal bindBean.
*/
public static void bindBean(RootParamNode rootParamNode, String name, Object bean) {
// Let a chance to plugins to bind this object
Object result = Play.pluginCollection.bindBean(rootParamNode, name, bean);
if (result != null) {
return;
}
ParamNode paramNode = StringUtils.isEmpty(name) ? rootParamNode : rootParamNode.getChild(name);
try {
internalBindBean(paramNode, bean, new BindingAnnotations());
} catch (Exception e) {
Validation.addError(paramNode.getOriginalKey(), "validation.invalid");
}
}
/**
* Does NOT invoke plugins
*/
public static void bindBean(ParamNode paramNode, Object bean, Annotation[] annotations) throws Exception {
internalBindBean(paramNode, bean, new BindingAnnotations(annotations));
}
private static void internalBindBean(ParamNode paramNode, Object bean, BindingAnnotations bindingAnnotations) throws Exception {
BeanWrapper bw = getBeanWrapper(bean.getClass());
for (BeanWrapper.Property prop : bw.getWrappers()) {
ParamNode propParamNode = paramNode.getChild(prop.getName());
if (propParamNode != null) {
// Create new ParamsContext for this property
Annotation[] annotations = null;
// first we try with annotations resolved from property
annotations = prop.getAnnotations();
BindingAnnotations propBindingAnnotations = new BindingAnnotations(annotations, bindingAnnotations.getProfiles());
Object value = internalBind(propParamNode, prop.getType(), prop.getGenericType(), propBindingAnnotations);
if (value != MISSING) {
if (value != NO_BINDING) {
prop.setValue(bean, value);
}
} else {
// retry without annotations resolved from property, but use input-annotations instead..
// This is actually necessary to parse Fixture (iso) dates
value = internalBind(propParamNode, prop.getType(), prop.getGenericType(), bindingAnnotations);
if (value != NO_BINDING && value != MISSING) {
prop.setValue(bean, value);
}
}
}
}
}
@SuppressWarnings("unchecked")
private static Object bindEnum(Class clazz, ParamNode paramNode) throws Exception {
if (paramNode.getValues() == null) {
return MISSING;
}
String value = paramNode.getFirstValue(null);
if (StringUtils.isEmpty(value)) {
return null;
}
return Enum.valueOf((Class) clazz, value);
}
private static Object bindMap(Class clazz, Type type, ParamNode paramNode, BindingAnnotations bindingAnnotations) throws Exception {
Class keyClass = String.class;
Class valueClass = String.class;
if (type instanceof ParameterizedType) {
keyClass = (Class) ((ParameterizedType) type).getActualTypeArguments()[0];
valueClass = (Class) ((ParameterizedType) type).getActualTypeArguments()[1];
}
Map r = new HashMap();
for (ParamNode child : paramNode.getAllChildren()) {
try {
Object keyObject = directBind(paramNode.getOriginalKey(), bindingAnnotations.annotations, child.getName(), keyClass, keyClass);
Object valueObject = internalBind(child, valueClass, valueClass, bindingAnnotations);
if (valueObject == NO_BINDING || valueObject == MISSING) {
valueObject = null;
}
r.put(keyObject, valueObject);
} catch (Exception e) {
// Just ignore the exception and continue on the next item
}
}
return r;
}
@SuppressWarnings("unchecked")
private static Object bindCollection(Class clazz, Type type, ParamNode paramNode, BindingAnnotations bindingAnnotations) throws Exception {
if (clazz.isInterface()) {
if (clazz.equals(List.class)) {
clazz = ArrayList.class;
} else if (clazz.equals(Set.class)) {
clazz = HashSet.class;
} else if (clazz.equals(SortedSet.class)) {
clazz = TreeSet.class;
} else {
clazz = ArrayList.class;
}
}
Class componentClass = String.class;
if (type instanceof ParameterizedType) {
componentClass = (Class) ((ParameterizedType) type).getActualTypeArguments()[0];
}
if (paramNode.getAllChildren().isEmpty()) {
// should use value-array as collection
String[] values = paramNode.getValues();
if (values == null) {
return MISSING;
}
if (bindingAnnotations.annotations != null) {
for (Annotation annotation : bindingAnnotations.annotations) {
if (annotation.annotationType().equals(As.class)) {
As as = ((As) annotation);
final String separator = as.value()[0];
if (separator != null && StringUtils.isNotEmpty(separator)){
values = values[0].split(separator);
}
}
}
}
Collection l = (Collection) clazz.newInstance();
for (int i = 0; i < values.length; i++) {
try {
Object value = directBind(paramNode.getOriginalKey(), bindingAnnotations.annotations, values[i], componentClass, componentClass);
l.add(value);
} catch (Exception e) {
// Just ignore the exception and continue on the next item
}
}
return l;
}
Collection r = (Collection) clazz.newInstance();
if (List.class.isAssignableFrom(clazz)) {
// Must add items at position resolved from each child's key
List l = (List) r;
// must get all indexes and sort them so we add items in correct order.
Set indexes = new TreeSet(new Comparator() {
public int compare(String arg0, String arg1) {
try {
return Integer.parseInt(arg0) - Integer.parseInt(arg1);
} catch (NumberFormatException e) {
return arg0.compareTo(arg1);
}
}
});
indexes.addAll(paramNode.getAllChildrenKeys());
// get each value in correct order with index
for (String index : indexes) {
ParamNode child = paramNode.getChild(index);
Object childValue = internalBind(child, componentClass, componentClass, bindingAnnotations);
if (childValue != NO_BINDING && childValue != MISSING) {
// must make sure we place the value at the correct position
int pos = Integer.parseInt(index);
// must check if we must add empty elements before adding this item
int paddingCount = (l.size() - pos) * -1;
if (paddingCount > 0) {
for (int p = 0; p < paddingCount; p++) {
l.add(null);
}
}
l.add(childValue);
}
}
return l;
}
for (ParamNode child : paramNode.getAllChildren()) {
Object childValue = internalBind(child, componentClass, componentClass, bindingAnnotations);
if (childValue != NO_BINDING && childValue != MISSING) {
r.add(childValue);
}
}
return r;
}
/**
* @param value
* @param clazz
* @return
* @throws Exception
*/
public static Object directBind(String value, Class clazz) throws Exception {
return directBind(null, value, clazz, null);
}
/**
* @param name
* @param annotations
* @param value
* @param clazz
* @param type
* @return
* @throws Exception
*/
public static Object directBind(String name, Annotation[] annotations, String value, Class clazz) throws Exception {
return directBind(name, annotations, value, clazz, null);
}
/**
* @param annotations
* @param value
* @param clazz
* @param type
* @return
* @throws Exception
*/
public static Object directBind(Annotation[] annotations, String value, Class clazz, Type type) throws Exception {
return directBind(null, annotations, value, clazz, type);
}
/**
* This method calls the user's defined binders prior to bind simple type
*
* @param name
* @param annotations
* @param value
* @param clazz
* @param type
* @return
* @throws Exception
*/
public static Object directBind(String name, Annotation[] annotations, String value, Class clazz, Type type) throws Exception {
// calls the direct binding and returns null if no value could be resolved..
Object r = internalDirectBind(name, annotations, value, clazz, type);
if ( r == DIRECTBINDING_NO_RESULT) {
return null;
} else {
return r;
}
}
// If internalDirectBind was not able to bind it, it returns a special variable instance: DIRECTBIND_MISSING
// Needs this because sometimes we need to know if no value was returned..
private static Object internalDirectBind(String name, Annotation[] annotations, String value, Class clazz, Type type) throws Exception {
boolean nullOrEmpty = value == null || value.trim().length() == 0;
if (annotations != null) {
for (Annotation annotation : annotations) {
if (annotation.annotationType().equals(As.class)) {
Class> toInstanciate = ((As) annotation).binder();
if (!(toInstanciate.equals(As.DEFAULT.class))) {
// Instantiate the binder
TypeBinder myInstance = toInstanciate.newInstance();
return myInstance.bind(name, annotations, value, clazz, type);
}
}
}
}
// application custom types have higher priority. If unable to bind proceed with the next one
for (Class> c : Play.classloader.getAssignableClasses(TypeBinder.class)) {
if (c.isAnnotationPresent(Global.class)) {
Class forType = (Class) ((ParameterizedType) c.getGenericInterfaces()[0]).getActualTypeArguments()[0];
if (forType.isAssignableFrom(clazz)) {
Object result = c.newInstance().bind(name, annotations, value, clazz, type);
if (result != null) {
return result;
}
}
}
}
// custom types
for (Class c : supportedTypes.keySet()) {
if (Logger.isTraceEnabled()) {
Logger.trace("directBind: value [" + value + "] c [" + c + "] Class [" + clazz + "]");
}
if (c.isAssignableFrom(clazz)) {
if (Logger.isTraceEnabled()) {
Logger.trace("directBind: isAssignableFrom is true");
}
return supportedTypes.get(c).bind(name, annotations, value, clazz, type);
}
}
// raw String
if (clazz.equals(String.class)) {
return value;
}
// Handles the case where the model property is a sole character
if (clazz.equals(Character.class)) {
return value.charAt(0);
}
// Enums
if (Enum.class.isAssignableFrom(clazz)) {
return nullOrEmpty ? null : Enum.valueOf((Class) clazz, value);
}
// int or Integer binding
if (clazz.getName().equals("int") || clazz.equals(Integer.class)) {
if (nullOrEmpty) {
return clazz.isPrimitive() ? 0 : null;
}
return Integer.parseInt(value.contains(".") ? value.substring(0, value.indexOf(".")) : value);
}
// long or Long binding
if (clazz.getName().equals("long") || clazz.equals(Long.class)) {
if (nullOrEmpty) {
return clazz.isPrimitive() ? 0l : null;
}
return Long.parseLong(value.contains(".") ? value.substring(0, value.indexOf(".")) : value);
}
// byte or Byte binding
if (clazz.getName().equals("byte") || clazz.equals(Byte.class)) {
if (nullOrEmpty) {
return clazz.isPrimitive() ? (byte) 0 : null;
}
return Byte.parseByte(value.contains(".") ? value.substring(0, value.indexOf(".")) : value);
}
// short or Short binding
if (clazz.getName().equals("short") || clazz.equals(Short.class)) {
if (nullOrEmpty) {
return clazz.isPrimitive() ? (short) 0 : null;
}
return Short.parseShort(value.contains(".") ? value.substring(0, value.indexOf(".")) : value);
}
// float or Float binding
if (clazz.getName().equals("float") || clazz.equals(Float.class)) {
if (nullOrEmpty) {
return clazz.isPrimitive() ? 0f : null;
}
return Float.parseFloat(value);
}
// double or Double binding
if (clazz.getName().equals("double") || clazz.equals(Double.class)) {
if (nullOrEmpty) {
return clazz.isPrimitive() ? 0d : null;
}
return Double.parseDouble(value);
}
// BigDecimal binding
if (clazz.equals(BigDecimal.class)) {
return nullOrEmpty ? null : new BigDecimal(value);
}
// boolean or Boolean binding
if (clazz.getName().equals("boolean") || clazz.equals(Boolean.class)) {
if (nullOrEmpty) {
return clazz.isPrimitive() ? false : null;
}
if (value.equals("1") || value.toLowerCase().equals("on") || value.toLowerCase().equals("yes")) {
return true;
}
return Boolean.parseBoolean(value);
}
return DIRECTBINDING_NO_RESULT;
}
}
