com.x5.util.ObjectDataMap Maven / Gradle / Ivy
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Chunk Template Engine for Java
package com.x5.util;
import java.beans.BeanInfo;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.annotation.Annotation;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
/**
* ObjectDataMap
*
* Box POJO/Bean/DataCapsule inside a Map. When accessed, pry into object
* using reflection/introspection/capsule-export and pull out all public
* member fields/properties.
* Convert field names from camelCase to lower_case_with_underscores
* Convert bean properties from getSomeProperty() to some_property
* or isVeryHappy() to is_very_happy
*
* Values returned are copies, frozen at time of first access.
*
*/
@SuppressWarnings("rawtypes")
public class ObjectDataMap implements Map
{
private Map pickle = null;
private Object object;
private Boolean isBean = null;
private static BeanIntrospector introspector = null;
private static final Map EMPTY_MAP = new HashMap();
private static final HashSet> WRAPPER_TYPES = getWrapperTypes();
private static final String TRUE = "TRUE";
private static final Class[] NO_ARGS = new Class[]{};
private static Map declaredFields = new HashMap();
private static Map looksLikePojo = new HashMap();
private static HashSet> getWrapperTypes()
{
HashSet> ret = new HashSet>();
ret.add(Boolean.class);
ret.add(Character.class);
ret.add(Byte.class);
ret.add(Short.class);
ret.add(Integer.class);
ret.add(Long.class);
ret.add(Float.class);
ret.add(Double.class);
ret.add(Void.class);
return ret;
}
public static boolean isWrapperType(Class clazz)
{
return WRAPPER_TYPES.contains(clazz);
}
public ObjectDataMap(Object pojo)
{
this.object = pojo;
}
private void init()
{
if (pickle == null) {
pickle = mapify(object);
// prevent multiple expensive calls to mapify
// when result is null
if (pickle == null) {
pickle = EMPTY_MAP;
}
}
}
public static ObjectDataMap wrapBean(Object bean)
{
if (bean == null) return null;
ObjectDataMap boxedBean = new ObjectDataMap(bean);
boxedBean.isBean = true;
return boxedBean;
}
private static Map hasOwnToString = new HashMap();
public boolean isBean()
{
return this.isBean != null && this.isBean;
}
public static String getAsString(Object obj)
{
Class objClass = obj.getClass();
Boolean doStringify = hasOwnToString.get(objClass);
if (doStringify == null) {
// perform expensive check... but just this once.
Method toString = null;
try {
toString = obj.getClass().getMethod("toString", NO_ARGS);
} catch (NoSuchMethodException e) {
} catch (SecurityException e) {
}
doStringify = new Boolean(toString != null && !toString.getDeclaringClass().equals(Object.class));
hasOwnToString.put(objClass, doStringify);
}
if (doStringify.booleanValue()) {
// class has its own toString method -- safe.
return obj.toString();
} else {
// don't expose Object's toString() info.
return "OBJECT:" + obj.getClass().getName();
}
}
private boolean hasBeanAnnotation(Class candidateClass)
{
return candidateClass.isAnnotationPresent(AccessAsBean.class);
}
private boolean hasPojoAnnotation(Class candidateClass)
{
return candidateClass.isAnnotationPresent(AccessAsPojo.class);
}
private Map mapify(Object pojo)
{
Map data = null;
if (pojo instanceof DataCapsule) {
return mapifyCapsule((DataCapsule)pojo);
}
if (isBean == null) {
Class objClass = pojo.getClass();
if (looksLikePojo.containsKey(objClass)) {
isBean = !looksLikePojo.get(objClass);
} else if (mightBePOJO(pojo)) {
data = mapifyPOJO(pojo);
// This is the first time we've tried to read fields from this class.
if (data != null && !data.isEmpty()) {
isBean = false;
return data;
}
// Failed to access as POJO. Always treat class as bean.
looksLikePojo.put(objClass, false);
isBean = true;
} else {
isBean = true;
}
}
if (!isBean) {
return mapifyPOJO(pojo);
}
if (introspector == null) {
introspector = pickIntrospector();
if (introspector == null) {
return data;
}
}
try {
return introspector.mapifyBean(pojo);
} catch (IntrospectionException e) {
// hmm, not a bean after all...
}
return data;
}
@SuppressWarnings("unused")
private static BeanIntrospector pickIntrospector()
{
// java.beans.* is missing on android.
// Test for existence before use...
try {
Class beanClass = Class.forName("java.beans.Introspector");
return new StandardIntrospector();
} catch (ClassNotFoundException e) {
try {
Class madrobotClass = Class.forName("com.madrobot.beans.Introspector");
return new MadRobotIntrospector();
} catch (ClassNotFoundException e2) {
return null;
}
}
}
private boolean mightBePOJO(Object pojo) {
Class pojoClass = pojo.getClass();
if (hasBeanAnnotation(pojoClass)) {
looksLikePojo.put(pojoClass, false);
return false;
}
if (hasPojoAnnotation(pojoClass)) {
looksLikePojo.put(pojoClass, true);
return true;
}
if (hasNonFinalPublicFields(pojo)) {
looksLikePojo.put(pojoClass, true);
return true;
}
return false;
}
private boolean hasNonFinalPublicFields(Object pojo)
{
boolean found = false;
Field[] fields = grokFields(pojo);
for (int i=0; i mapifyPOJO(Object pojo)
{
Field[] fields = grokFields(pojo);
Map pickle = null;
for (int i=0; i();
// convert isActive to is_active
paramName = splitCamelCase(paramName);
storeValue(pickle, paramClass, paramName, paramValue, isBean());
}
return pickle;
}
private Map mapifyCapsule(DataCapsule capsule)
{
DataCapsuleReader reader = DataCapsuleReader.getReader(capsule);
String[] tags = reader.getColumnLabels(null);
Object[] data = reader.extractData(capsule);
pickle = new HashMap();
for (int i=0; i pickle, Class paramClass,
String paramName, Object paramValue, boolean isBean)
{
if (paramValue == null) {
pickle.put(paramName, null);
} else if (paramClass == String.class) {
pickle.put(paramName, paramValue);
} else if (paramClass.isArray() || paramValue instanceof List) {
pickle.put(paramName, paramValue);
} else if (paramValue instanceof Boolean) {
if (((Boolean)paramValue).booleanValue()) {
pickle.put(paramName, TRUE);
}
} else if (paramClass.isPrimitive() || isWrapperType(paramClass)) {
pickle.put(paramName, paramValue);
} else {
// box all non-primitive object member fields
// in their own ObjectDataMap wrapper.
// lazy init guarantees no infinite recursion here.
ObjectDataMap boxedParam = isBean ? wrapBean(paramValue) : new ObjectDataMap(paramValue);
pickle.put(paramName, boxedParam);
}
}
private static Map snakeCased = new HashMap();
// splitCamelCase converts SimpleXMLStuff to simple_xml_stuff
public static String splitCamelCase(String s)
{
String cached = snakeCased.get(s);
if (cached != null) return cached;
// no regex! single pass through string
StringBuilder snakeCase = new StringBuilder();
int m = 0;
char[] chars = s.toCharArray();
// ascii lower
char[] lower = new char[chars.length];
for (int i=0; i= 'A' && c <= 'Z') ? (char)(c + 32) : c;
}
for (int i=1; i 'Z') {
if (c1 >= 'A' && c1 <= 'Z') {
// non-cap, then cap
snakeCase.append(lower, m, i-m);
snakeCase.append('_');
m = i;
}
} else if (i-m > 1 && c0 >= 'A' && c0 <= 'Z' && (c1 > 'Z' || c1 < 'A')) {
snakeCase.append(lower, m, i-1-m);
snakeCase.append('_');
m = i-1;
}
}
snakeCase.append(lower, m, lower.length-m);
cached = snakeCase.toString();
snakeCased.put(s, cached);
return cached;
}
public int size()
{
init();
return pickle.size();
}
public boolean isEmpty()
{
init();
return pickle.isEmpty();
}
public boolean containsKey(Object key)
{
init();
return pickle.containsKey(key);
}
public boolean containsValue(Object value)
{
init();
return pickle.containsValue(value);
}
public Object get(Object key)
{
init();
return pickle.get(key);
}
public Object put(Object key, Object value)
{
// unsupported
return null;
}
public Object remove(Object key)
{
// unsupported
return null;
}
public void putAll(Map m)
{
// unsupported
}
public void clear()
{
// unsupported
}
public Set keySet()
{
init();
return pickle.keySet();
}
public Collection values()
{
init();
return pickle.values();
}
public Set entrySet()
{
init();
return pickle.entrySet();
}
private static class Getter
{
private static final Object[] NO_ARGS = (Object[])null;
Method getter;
Class valueClass;
String name;
public Getter(PropertyDescriptor property, Method getter)
{
this.getter = getter;
this.valueClass = property.getPropertyType();
String paramName = property.getName();
paramName = splitCamelCase(paramName);
if (getter.getName().startsWith("is")) {
paramName = "is_"+paramName;
}
this.name = paramName;
}
Object invoke(Object target)
throws InvocationTargetException, IllegalAccessException
{
return getter.invoke(target, NO_ARGS);
}
}
private static class IntrospectionException extends Exception
{
private static final long serialVersionUID = 8890979383599687484L;
}
private static interface BeanIntrospector {
public Map mapifyBean(Object bean) throws IntrospectionException;
}
private static class StandardIntrospector implements BeanIntrospector
{
private static Map> beanGetters = new HashMap>();
public Map mapifyBean(Object bean)
throws IntrospectionException
{
Class beanClass = bean.getClass();
List getters = beanGetters.get(beanClass);
if (getters == null) {
PropertyDescriptor[] properties = null;
try {
BeanInfo beanInfo = Introspector.getBeanInfo(bean.getClass());
properties = beanInfo.getPropertyDescriptors();
} catch (java.beans.IntrospectionException e) {
throw new IntrospectionException();
}
if (properties == null) return null;
getters = new ArrayList();
for (PropertyDescriptor property : properties) {
Method getter = property.getReadMethod();
if (getter == null) continue;
getters.add(new Getter(property, getter));
}
beanGetters.put(beanClass, getters);
}
Map pickle = null;
// copy properties into hashtable
for (Getter getter : getters) {
try {
Object paramValue = getter.invoke(bean);
if (paramValue != null) {
if (pickle == null) pickle = new HashMap();
storeValue(pickle, getter.valueClass, getter.name, paramValue, true);
}
} catch (InvocationTargetException e) {
} catch (IllegalAccessException e) {
}
}
return pickle;
}
}
// mad robot provides a stopgap introspection library for android projects
private static class MadRobotIntrospector implements BeanIntrospector
{
public Map mapifyBean(Object bean)
throws IntrospectionException
{
com.madrobot.beans.PropertyDescriptor[] properties = null;
try {
com.madrobot.beans.BeanInfo beanInfo = com.madrobot.beans.Introspector.getBeanInfo(bean.getClass());
properties = beanInfo.getPropertyDescriptors();
} catch (com.madrobot.beans.IntrospectionException e) {
throw new IntrospectionException();
}
if (properties == null) return null;
Map pickle = null;
// copy properties into hashtable
for (com.madrobot.beans.PropertyDescriptor property : properties) {
Class paramClass = property.getPropertyType();
Method getter = property.getReadMethod();
try {
Object paramValue = getter.invoke(bean, (Object[])null);
if (paramValue != null) {
// converts isActive() to is_active
// converts getBookTitle() to book_title
String paramName = property.getName();
paramName = splitCamelCase(paramName);
if (getter.getName().startsWith("is")) {
paramName = "is_"+paramName;
}
if (pickle == null) pickle = new HashMap();
storeValue(pickle, paramClass, paramName, paramValue, true);
}
} catch (InvocationTargetException e) {
} catch (IllegalAccessException e) {
}
}
return pickle;
}
}
public String toString()
{
return getAsString(this.object);
}
public Object unwrap()
{
return this.object;
}
}
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