/*
* Copyright 2013 Red Hat, Inc. and/or its affiliates.
*
* Licensed under the Eclipse Public License version 1.0, available at
* http://www.eclipse.org/legal/epl-v10.html
*/
package org.jboss.forge.addon.ui.impl.annotation;
import java.lang.annotation.Annotation;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;
import org.jboss.forge.addon.ui.annotation.Command;
import org.jboss.forge.addon.ui.annotation.Option;
import org.jboss.forge.addon.ui.command.UICommand;
import org.jboss.forge.addon.ui.context.UIBuilder;
import org.jboss.forge.addon.ui.context.UIContext;
import org.jboss.forge.addon.ui.context.UIExecutionContext;
import org.jboss.forge.addon.ui.context.UIValidationContext;
import org.jboss.forge.addon.ui.impl.input.InputComponentProducer;
import org.jboss.forge.addon.ui.input.InputComponent;
import org.jboss.forge.addon.ui.input.SelectComponent;
import org.jboss.forge.addon.ui.metadata.UICommandMetadata;
import org.jboss.forge.addon.ui.result.Result;
import org.jboss.forge.addon.ui.result.Results;
import org.jboss.forge.addon.ui.util.Categories;
import org.jboss.forge.addon.ui.util.InputComponents;
import org.jboss.forge.addon.ui.util.Metadata;
import org.jboss.forge.furnace.util.Predicate;
/**
* This class acts as an adapter to the UI API for methods with the annotation @Command
*
* @author <a href="mailto:ggastald@redhat.com">George Gastaldi</a>
*
*/
public class AnnotationCommandAdapter implements UICommand
{
private final List<InputComponent<?, ?>> inputs = new ArrayList<>();
private final InputComponentProducer factory;
private final Method method;
private final Object instance;
private final List<Predicate<UIContext>> enabledPredicates;
public AnnotationCommandAdapter(Method method, Object instance, InputComponentProducer factory,
List<Predicate<UIContext>> enabledPredicates)
{
this.method = method;
this.instance = instance;
this.factory = factory;
this.enabledPredicates = enabledPredicates;
}
@Override
public UICommandMetadata getMetadata(UIContext context)
{
Command ann = method.getAnnotation(Command.class);
String name = ann.value();
if (name.isEmpty())
{
name = method.getName();
}
return Metadata.forCommand(method.getDeclaringClass()).name(name).description(ann.help())
.category(Categories.create(ann.categories()));
}
@Override
public boolean isEnabled(UIContext context)
{
boolean enabled = true;
for (int i = 0; enabled && (i < enabledPredicates.size()); i++)
{
enabled &= enabledPredicates.get(i).accept(context);
}
return enabled;
}
@Override
public void initializeUI(UIBuilder builder) throws Exception
{
int position = 0;
for (Class<?> parameterType : method.getParameterTypes())
{
if (!ReservedParameters.isReservedParameter(parameterType))
{
Option option = null;
for (Annotation annotation : method.getParameterAnnotations()[position])
{
if (annotation instanceof Option)
{
option = (Option) annotation;
}
}
if (option != null)
{
char shortName = option.shortName();
String paramName = (option.value().isEmpty()) ? "param" + position : option.value();
InputComponent<?, ?> input;
if (Iterable.class.isAssignableFrom(parameterType))
{
// TODO: UIInputMany or UISelectMany ?
input = factory.createInputMany(paramName, shortName, parameterType);
}
else if (parameterType.isEnum() || Boolean.class == parameterType)
{
input = factory.createSelectOne(paramName, shortName, parameterType);
factory.setupSelectComponent((SelectComponent<?, ?>) input);
}
else
{
input = factory.createInput(paramName, shortName, parameterType);
}
factory.preconfigureInput(input, option);
builder.add(input);
inputs.add(input);
}
}
position++;
}
}
@Override
public void validate(UIValidationContext validator)
{
// TODO
}
@Override
public Result execute(UIExecutionContext context) throws Exception
{
List<Object> args = new ArrayList<>();
int idx = 0;
for (Class<?> type : method.getParameterTypes())
{
Object value = null;
if (ReservedParameters.isReservedParameter(type))
{
value = ReservedParameters.getReservedParameter(context, type);
}
else
{
Option option = null;
for (Annotation annotation : method.getParameterAnnotations()[idx])
{
if (annotation instanceof Option)
{
option = (Option) annotation;
}
}
if (option != null)
{
value = InputComponents.getValueFor(inputs.get(idx));
idx++;
}
}
args.add(value);
}
Object result = null;
try
{
result = method.invoke(instance, args.toArray(new Object[args.size()]));
}
catch (InvocationTargetException ie)
{
throw (Exception) ie.getCause();
}
if (result == null)
{
return Results.success();
}
else if (result instanceof Result)
{
return (Result) result;
}
else
{
return Results.success(result.toString());
}
}
}