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package org.glassfish.jersey.server.model;
import java.lang.reflect.Constructor;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
import javax.ws.rs.Encoded;
import org.glassfish.jersey.internal.inject.Injections;
import org.glassfish.hk2.api.ServiceLocator;
/**
* Resource method handler model.
*
* @author Marek Potociar (marek.potociar at oracle.com)
*/
public abstract class MethodHandler implements ResourceModelComponent {
/**
* Create a class-based method handler from a class.
*
* @param handlerClass method handler class.
* @return new class-based method handler.
*/
public static MethodHandler create(final Class handlerClass) {
return new ClassBasedMethodHandler(handlerClass);
}
/**
* Create a class-based method handler from a class.
*
* @param handlerClass method handler class.
* @param disableParamDecoding if set to {@code true}, any injected constructor
* parameters must be kept encoded and must not be automatically decoded.
* @return new class-based method handler.
*/
public static MethodHandler create(final Class handlerClass, final boolean disableParamDecoding) {
return new ClassBasedMethodHandler(handlerClass, disableParamDecoding);
}
/**
* Create a instance-based (singleton) method handler from a class.
*
* @param handlerInstance method handler instance (singleton).
* @return new instance-based method handler.
*/
public static MethodHandler create(final Object handlerInstance) {
return new InstanceBasedMethodHandler(handlerInstance);
}
/**
* Create a instance-based (singleton) method handler from a class.
*
* This method
*
* @param handlerInstance method handler instance (singleton).
* @param handlerClass declared handler class.
* @return new instance-based method handler.
*/
public static MethodHandler create(final Object handlerInstance, Class handlerClass) {
return new InstanceBasedMethodHandler(handlerInstance, handlerClass);
}
/**
* Get the resource method handler class.
*
* @return resource method handler class.
*/
public abstract Class getHandlerClass();
/**
* Get the resource method handler constructors.
*
* The returned is empty by default. Concrete implementations may override
* the method to return the actual list of constructors that will be used
* for the handler initialization.
*
* @return resource method handler constructors.
*/
public List getConstructors() {
return Collections.emptyList();
}
/**
* Get the injected resource method handler instance.
*
* @param locator service locator that can be used to inject get the instance.
* @return injected resource method handler instance.
*/
public abstract Object getInstance(final ServiceLocator locator);
/**
* Return whether the method handler {@link ServiceLocator creates instances}
* based on {@link Class classes}.
*
* @return True is instances returned bu this method handler are created from {@link Class classes} given to HK2, false\
* otherwise (for example when method handler was initialized from instance)
*/
public abstract boolean isClassBased();
@Override
public List getComponents() {
return null;
}
@Override
public void accept(final ResourceModelVisitor visitor) {
visitor.visitMethodHandler(this);
}
private static class ClassBasedMethodHandler extends MethodHandler {
private final Class handlerClass;
private final List handlerConstructors;
public ClassBasedMethodHandler(final Class handlerClass) {
this(handlerClass, handlerClass.isAnnotationPresent(Encoded.class));
}
public ClassBasedMethodHandler(final Class handlerClass, final boolean disableParamDecoding) {
this.handlerClass = handlerClass;
List constructors = new LinkedList();
for (Constructor constructor : handlerClass.getConstructors()) {
constructors.add(new HandlerConstructor(
constructor, Parameter.create(handlerClass, handlerClass, constructor, disableParamDecoding)));
}
this.handlerConstructors = Collections.unmodifiableList(constructors);
}
@Override
public Class getHandlerClass() {
return handlerClass;
}
@Override
public List getConstructors() {
return handlerConstructors;
}
@Override
public Object getInstance(final ServiceLocator locator) {
return Injections.getOrCreate(locator, handlerClass);
}
@Override
public boolean isClassBased() {
return true;
}
@Override
protected Object getHandlerInstance() {
return null;
}
@Override
public List getComponents() {
return handlerConstructors;
}
@Override
public String toString() {
return "ClassBasedMethodHandler{"
+ "handlerClass=" + handlerClass
+ ", handlerConstructors=" + handlerConstructors + '}';
}
}
private static class InstanceBasedMethodHandler extends MethodHandler {
private final Object handler;
private final Class handlerClass;
public InstanceBasedMethodHandler(final Object handler) {
this.handler = handler;
this.handlerClass = handler.getClass();
}
public InstanceBasedMethodHandler(final Object handler, final Class handlerClass) {
this.handler = handler;
this.handlerClass = handlerClass;
}
@Override
public Class getHandlerClass() {
return handlerClass;
}
@Override
protected Object getHandlerInstance() {
return handler;
}
@Override
public Object getInstance(final ServiceLocator locator) {
return handler;
}
@Override
public boolean isClassBased() {
return false;
}
@Override
public String toString() {
return "InstanceBasedMethodHandler{" +
"handler=" + handler +
", handlerClass=" + handlerClass +
'}';
}
}
/**
* Get the raw handler instance that is backing this method handler.
*
* @return raw handler instance. May return {@code null} if the handler is
* {@link #isClassBased() class-based}.
*/
protected abstract Object getHandlerInstance();
}