com.dtrules.automapping.access.JavaSource Maven / Gradle / Ivy
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/**
* Copyright 2004-2011 DTRules.com, Inc.
*
* See http://DTRules.com for updates and documentation for the DTRules Rules Engine
*
* 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.
**/
package com.dtrules.automapping.access;
import java.lang.reflect.Method;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.List;
import com.dtrules.automapping.AutoDataMap;
import com.dtrules.automapping.AutoDataMapDef;
import com.dtrules.automapping.Group;
import com.dtrules.automapping.Label;
import com.dtrules.automapping.MapType;
import com.dtrules.automapping.nodes.MapNodeAttribute;
import com.dtrules.automapping.nodes.MapNodeList;
import com.dtrules.automapping.nodes.MapNodeMap;
import com.dtrules.automapping.nodes.MapNodeObject;
import com.dtrules.automapping.nodes.MapNodeRef;
/**
* @author Paul Snow
*
*/
public class JavaSource implements IDataSource {
final AutoDataMapDef autoDataMapDef;
final String type = "java";
public JavaSource(AutoDataMapDef autoDataMapDef){
this.autoDataMapDef = autoDataMapDef;
}
@Override
public Label createLabel(
AutoDataMap autoDataMap,
Group group,
String labelName,
String key,
boolean singular,
Object object) {
if (key == null || key.trim().length()==0) key = "";
if (labelName == null || labelName.trim().length()== 0){
throw new RuntimeException("A Label has to have a valid Label Name.");
}
Label labelObj = group.findLabel(labelName,"java",object.getClass().getName());
if(labelObj == null ){
labelObj = Label.newLabel(group,labelName,object.getClass().getName(),key,singular);
}
if(labelObj.isCached()== false){
cacheGetters(group, labelObj,object);
labelObj.setCached(true);
}
return labelObj;
}
@Override
public String getSpec(Object obj) {
return obj.getClass().getName();
}
@Override
public String getName(Object obj) {
String name = obj.getClass().getSimpleName();
name = name.substring(0,1).toLowerCase() +
(name.length()>1? name.substring(1): "");
return name;
}
/**
* Looks for an accessor that looks like getClassNameId()
*/
@Override
public String getKey(Object obj) {
String name = obj.getClass().getSimpleName();
Method[] methods = obj.getClass().getMethods();
for(Method method : methods){
String mName = method.getName();
String propertyName = getterName(method);
if(propertyName != null
&& mName.substring(3).startsWith(name)
&& propertyName.length()-2 == name.length()
&& propertyName.endsWith("Id")){
return propertyName;
}
}
return "";
}
/**
* Extracts the property name from a Getter Name. Of course, this can't
* be done if this method really isn't a getter. If the method isn't a
* getter, a null is returned.
* @param method
* @return
*/
@SuppressWarnings("unchecked")
public static String getterName(Method method){
boolean startsWithGet = method.getName().startsWith("get");
boolean startsWithIs = method.getName().startsWith("is");
Class v = method.getReturnType();
boolean v_void = void.class.equals(v);
boolean v_boolean = boolean.class.equals(v) || Boolean.class.equals(v);
int paramCnt = method.getParameterTypes().length;
// All getters must past the following tests!
if(!startsWithGet && !startsWithIs) return null;
if(startsWithGet && method.getName().length()==3) return null;
if(startsWithIs && method.getName().length()==2) return null;
if(startsWithIs && !v_boolean) return null;
if(v_void) return null;
if(paramCnt != 0) return null;
// Okay! This is a Getter! Extract the name!
String name = method.getName().substring(startsWithGet ? 3:2); // get and is are my two options
name = name.substring(0,1).toLowerCase()+ // lowercase first char
(name.length()>1 ? name.substring(1):""); // If more char follow, add them
return name;
}
/**
* Extracts the property name from a Setter Name. Of course, this can't
* be done if this method really isn't a setter. If the method isn't a
* setter, a null is returned.
* @param method
* @return
*/
@SuppressWarnings("unchecked")
public static String setterName(Method method){
boolean startsWithSet = method.getName().startsWith("set");
Class v = method.getReturnType();
boolean v_void = void.class.equals(v);
int paramCnt = method.getParameterTypes().length;
// All setters must past the following tests!
if(!startsWithSet) return null;
if(method.getName().length()==3) return null;
if(!v_void) return null;
if(paramCnt != 1) return null;
// Okay! This is a Setter! Extract the name!
String name = method.getName().substring(3);
name = name.substring(0,1).toLowerCase()+ // lowercase first char
(name.length()>1 ? name.substring(1):""); // If more char follow, add them
return name;
}
public static class Accessor {
Boolean caseSensitive = true; // name is case sensitive
String name; // Property name
Method getter; // Getter method
Method setter; // Setter method
@SuppressWarnings("unchecked")
Class typeClass; // The type of the property
MapType type; // Return/Parameter type
String typeText; // Actual text of the type
MapType subType=MapType.NULL; // With lists and references, you have a subtype
String subTypeText=""; // Actual text of the subtype
@Override
public String toString(){
return name;
}
@SuppressWarnings("unchecked")
Accessor(String name, Class type, Class subtype){
this.name = name;
this.typeClass = type;
this.typeText = type.getSimpleName();
this.type = MapType.get(typeText);
if(subtype!=null){
subTypeText = subtype.getSimpleName();
subType = MapType.get(subTypeText);
}
}
}
/**
* Look at the Java Object for this Label, and cache all the getters. For
* every getter, we look for a setter and cache it too. We should be able
* to handle setters without getters, but for now that case is ignored.
*/
@SuppressWarnings("unchecked")
public void cacheGetters(Group group, Label label, Object object){
try{
Class obj = object.getClass(); // Get this object class
if(obj==null)return; // None found? Shouldn't happen.
// Map all the attributes
ArrayList accessors = getAccessors(group, object);
for(Accessor accessor : accessors){
try { // We will ignore getters we can't access
JavaAttribute attribute = JavaAttribute.newAttribute(
label,
accessor.name,
accessor.getter.getName(),
accessor.setter == null ? null : accessor.setter.getName(),
accessor.typeClass,
accessor.type,
accessor.typeText,
accessor.subType,
accessor.subTypeText);
attribute.setGetMethod(accessor.getter);
attribute.setSetMethod(accessor.setter);
} catch (Exception e) {}
}
} catch (Exception e) {
e.printStackTrace();
System.out.println(e.toString());
}
}
/**
* We look at the return type specified on the Method to determine the subType
* of a List. For anything else, we are going to return a null for the subType.
* @param method
* @return subType of list
*/
@SuppressWarnings("unchecked")
private Class getSubType(Method method){
Type returnType = method.getGenericReturnType();
Class returnClass = null;
if(returnType instanceof ParameterizedType){
ParameterizedType type = (ParameterizedType) returnType;
Type[] typeArguments = type.getActualTypeArguments();
for(Type typeArgument : typeArguments){
try{
returnClass = (Class) typeArgument;
}catch(Exception e){
returnClass = Class.class;
}
}
}
return returnClass;
}
/**
* Looks up all the getters off the given object.
* @param obj
* @return
*/
@SuppressWarnings("unchecked")
public ArrayList getAccessors(Group group, Object obj) {
ArrayList gs = new ArrayList();
Class javaclass = obj.getClass();
if(javaclass != null){
Method methods[] = javaclass.getMethods();
for(Method method : methods){
String name = getterName(method);
if(name!= null){
Class subType = getSubType(method);
if(subType!=null){
Label label;
if(subType.isPrimitive()){
label = group.findLabelBySpec(method.getName());
}else{
label = group.findLabelBySpec(subType.getName());
}
if(label!=null && group.isPruned(label.getSpec())){
continue;
}
}
try{
Method setter = null;
String settername = "set"+name.substring(0,1).toUpperCase()+
((name.length()>1)?name.substring(1):"");
for(Method s : methods){
if(s.getName().equals(settername)) {
setter = s;
break;
}
}
Accessor getter = new Accessor(
name,
method.getReturnType(),
getSubType(method));
getter.getter = method;
getter.setter = setter;
getter.caseSensitive = Boolean.TRUE;
gs.add(getter);
}catch(Exception e){}
}
}
}
return gs;
}
@SuppressWarnings("unchecked")
@Override
public List getChildren(Object obj){
return new ArrayList();
}
/**
* We don't need this mechanism for Java Objects as it is pretty easy for us
* to just go grab the key.
*/
public Object getKeyValue(MapNodeObject node, Object object){
return node.getKey();
}
@Override
public void update(AutoDataMap autoDataMap, MapNodeAttribute node) {
if(node.getParent() instanceof MapNodeObject){
Object obj = ((MapNodeObject)node.getParent()).getSource();
if(obj != null){
node.getAttribute().set(obj, node.getData());
}
}
}
@Override
public void update(AutoDataMap autoDataMap, MapNodeList node) {
if(node.getParent() instanceof MapNodeObject){
Object obj = ((MapNodeObject)node.getParent()).getSource();
if(obj != null){
if(node.getList().size()==0){
node.getAttribute().set(obj,null);
return;
}
node.getAttribute().set(obj, node.getList());
}
}
}
@Override
public void update(AutoDataMap autoDataMap, MapNodeMap node) {
if(node.getParent() instanceof MapNodeObject){
Object obj = ((MapNodeObject)node.getParent()).getSource();
if(obj != null){
if(node.getMap().size()==0){
node.getAttribute().set(obj,null);
return;
}
node.getAttribute().set(obj, node.getMap());
}
}
}
@Override
public void update(AutoDataMap autoDataMap, MapNodeObject node) {
}
@Override
public void update(AutoDataMap autoDataMap, MapNodeRef node) {
}
}
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