/*
* Copyright 2015 Red Hat, Inc. and/or its affiliates.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
*
* 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 org.jbpm.services.task.impl.model.xml;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;
import javax.xml.bind.annotation.XmlTransient;
import org.kie.api.task.model.User;
import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
@JsonIgnoreProperties({"realClass"})
public class AbstractJaxbTaskObject<T> {
@XmlTransient
protected Class<?> realClass;
public AbstractJaxbTaskObject() {
throw new UnsupportedOperationException("No-arg constructor must be implemented by the concrete class.");
}
protected AbstractJaxbTaskObject(Class<?> realClass) {
this.realClass = realClass;
}
protected AbstractJaxbTaskObject(T taskObject, Class<?> objectInterface) {
this(objectInterface);
initialize(taskObject, objectInterface);
}
protected void initialize(T taskObject, Class<?> objectInterface) {
if (taskObject != null) {
for (Method getIsMethod : objectInterface.getDeclaredMethods() ) {
String methodName = getIsMethod.getName();
String fieldName;
if( getIsMethod.getReturnType().equals(User.class) ) {
continue;
}
if (methodName.startsWith("set")) {
continue;
}
if (methodName.startsWith("get")) {
fieldName = methodName.substring(3);
} else if (methodName.startsWith("is")) {
fieldName = methodName.substring(2);
}
else {
assert false : "Unknown method '" + methodName + "' in "+ this.getClass().getSimpleName() + ".";
continue;
}
// getField -> field (lowercase f)
fieldName = fieldName.substring(0,1).toLowerCase() + fieldName.substring(1);
try {
Field field = this.getClass().getDeclaredField(fieldName);
boolean origAccessStatus = field.isAccessible();
field.setAccessible(true);
Object setObject = getIsMethod.invoke(taskObject, new Object[0]);
field.set(this, setObject);
field.setAccessible(origAccessStatus);
} catch( Exception e ) {
throw new RuntimeException("Unable to initialize " + fieldName + " when creating " + this.getClass().getSimpleName() + ".", e );
}
}
}
}
static <T> T unsupported(Class<T> realClass) {
String methodName = (new Throwable()).getStackTrace()[1].getMethodName();
throw new UnsupportedOperationException(methodName + " is not supported on the JAXB " + realClass.getSimpleName() + " implementation.");
}
@SuppressWarnings("unchecked")
public static <I,J extends I> List<J> convertListFromInterfaceToJaxbImpl(List<I> interfacelList, Class<I> interfaceClass, Class<J> jaxbClass) {
List<J> jaxbList;
if( interfacelList != null ) {
jaxbList = new ArrayList<J>(interfacelList.size());
for( I interfaze : interfacelList ) {
if( jaxbClass.isAssignableFrom(interfaze.getClass()) ) {
jaxbList.add((J) interfaze);
} else {
jaxbList.add(jaxbConstructorWithInternalAsArgument(jaxbClass, interfaceClass, interfaze));
}
}
} else {
jaxbList = new ArrayList<J>();
}
return jaxbList;
}
private static <J,I> J jaxbConstructorWithInternalAsArgument(Class<J> jaxbClass, Class<I> interfaze, I argument) {
Class [] cnstrArgs = { interfaze };
try {
Constructor<J> cnstr = jaxbClass.getConstructor(cnstrArgs);
return cnstr.newInstance(argument);
} catch( Exception e ) {
throw new RuntimeException("Unable to create " + jaxbClass.getName() + " using constructor with " + interfaze.getName() + " argument.", e);
}
}
@SuppressWarnings("unchecked")
static <T> T whenNull(Object value, T defaultValue) {
if (value == null) {
return defaultValue;
}
return (T) value;
}
public void writeExternal( ObjectOutput out ) throws IOException {
unsupported(realClass);
}
public void readExternal( ObjectInput in ) throws IOException, ClassNotFoundException {
unsupported(realClass);
}
}