org.picocontainer.parameters.BasicComponentParameter Maven / Gradle / Ivy
/*****************************************************************************
* Copyright (C) PicoContainer Organization. All rights reserved. *
* ------------------------------------------------------------------------- *
* The software in this package is published under the terms of the BSD *
* style license a copy of which has been included with this distribution in *
* the LICENSE.txt file. *
* *
* Original code by *
*****************************************************************************/
package org.picocontainer.parameters;
import java.io.Serializable;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.lang.annotation.Annotation;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import org.picocontainer.*;
import org.picocontainer.injectors.AbstractInjector;
import org.picocontainer.injectors.InjectInto;
/**
* A BasicComponentParameter should be used to pass in a particular component as argument to a
* different component's constructor. This is particularly useful in cases where several
* components of the same type have been registered, but with a different key. Passing a
* ComponentParameter as a parameter when registering a component will give PicoContainer a hint
* about what other component to use in the constructor. This Parameter will never resolve
* against a collecting type, that is not directly registered in the PicoContainer itself.
*
* @author Jon Tirsén
* @author Aslak Hellesøy
* @author Jörg Schaible
* @author Thomas Heller
*/
@SuppressWarnings("serial")
public class BasicComponentParameter extends AbstractParameter implements Parameter, Serializable {
/** BASIC_DEFAULT is an instance of BasicComponentParameter using the default constructor. */
public static final BasicComponentParameter BASIC_DEFAULT = new BasicComponentParameter();
private Object componentKey;
/**
* Expect a parameter matching a component of a specific key.
*
* @param componentKey the key of the desired addComponent
*/
public BasicComponentParameter(Object componentKey) {
this.componentKey = componentKey;
}
/** Expect any parameter of the appropriate type. */
public BasicComponentParameter() {
}
/**
* Check whether the given Parameter can be satisfied by the container.
*
* @return true if the Parameter can be verified.
*
* @throws org.picocontainer.PicoCompositionException
* {@inheritDoc}
* @see Parameter#isResolvable(PicoContainer, ComponentAdapter, Class, NameBinding ,boolean, Annotation)
*/
public Resolver resolve(final PicoContainer container,
final ComponentAdapter forAdapter,
final ComponentAdapter injecteeAdapter, final Type expectedType,
NameBinding expectedNameBinding, boolean useNames, Annotation binding) {
Class resolvedClassType = null;
// TODO take this out for Pico3
if (!(expectedType instanceof Class)) {
if (expectedType instanceof ParameterizedType) {
resolvedClassType = (Class) ((ParameterizedType)expectedType).getRawType();
} else {
return new Parameter.NotResolved();
}
} else {
resolvedClassType = (Class)expectedType;
}
assert resolvedClassType != null;
ComponentAdapter componentAdapter0;
if (injecteeAdapter == null) {
componentAdapter0 = resolveAdapter(container, forAdapter, resolvedClassType, expectedNameBinding, useNames, binding);
} else {
componentAdapter0 = injecteeAdapter;
}
final ComponentAdapter componentAdapter = componentAdapter0;
return new Resolver() {
public boolean isResolved() {
return componentAdapter != null;
}
public Object resolveInstance() {
if (componentAdapter == null) {
return null;
}
if (componentAdapter instanceof DefaultPicoContainer.LateInstance) {
return convert(getConverters(container), ((DefaultPicoContainer.LateInstance) componentAdapter).getComponentInstance(), expectedType);
// } else if (injecteeAdapter != null && injecteeAdapter instanceof DefaultPicoContainer.KnowsContainerAdapter) {
// return convert(((DefaultPicoContainer.KnowsContainerAdapter) injecteeAdapter).getComponentInstance(makeInjectInto(forAdapter)), expectedType);
} else {
return convert(getConverters(container), container.getComponent(componentAdapter.getComponentKey(), makeInjectInto(forAdapter)), expectedType);
}
}
public ComponentAdapter getComponentAdapter() {
return componentAdapter;
}
};
}
private Converters getConverters(PicoContainer container) {
return container instanceof Converting ? ((Converting) container).getConverters() : null;
}
private static InjectInto makeInjectInto(ComponentAdapter forAdapter) {
return new InjectInto(forAdapter.getComponentImplementation(), forAdapter.getComponentKey());
}
private static Object convert(Converters converters, Object obj, Type expectedType) {
if (obj instanceof String && expectedType != String.class) {
obj = converters.convert((String) obj, expectedType);
}
return obj;
}
public void verify(PicoContainer container,
ComponentAdapter forAdapter,
Type expectedType,
NameBinding expectedNameBinding, boolean useNames, Annotation binding) {
final ComponentAdapter componentAdapter =
resolveAdapter(container, forAdapter, (Class)expectedType, expectedNameBinding, useNames, binding);
if (componentAdapter == null) {
final Set set = new HashSet();
set.add(expectedType);
throw new AbstractInjector.UnsatisfiableDependenciesException(
forAdapter.getComponentImplementation().getName() + " has unsatisfied dependencies: " + set + " from " + container);
}
componentAdapter.verify(container);
}
/**
* Visit the current {@link Parameter}.
*
* @see org.picocontainer.Parameter#accept(org.picocontainer.PicoVisitor)
*/
public void accept(final PicoVisitor visitor) {
visitor.visitParameter(this);
}
protected ComponentAdapter resolveAdapter(PicoContainer container,
ComponentAdapter adapter,
Class expectedType,
NameBinding expectedNameBinding, boolean useNames, Annotation binding) {
Class type = expectedType;
if (type.isPrimitive()) {
String expectedTypeName = expectedType.getName();
if (expectedTypeName == "int") {
type = Integer.class;
} else if (expectedTypeName == "long") {
type = Long.class;
} else if (expectedTypeName == "float") {
type = Float.class;
} else if (expectedTypeName == "double") {
type = Double.class;
} else if (expectedTypeName == "boolean") {
type = Boolean.class;
} else if (expectedTypeName == "char") {
type = Character.class;
} else if (expectedTypeName == "short") {
type = Short.class;
} else if (expectedTypeName == "byte") {
type = Byte.class;
}
}
ComponentAdapter result = null;
if (componentKey != null) {
// key tells us where to look so we follow
result = typeComponentAdapter(container.getComponentAdapter(componentKey));
} else if (adapter == null) {
result = container.getComponentAdapter(type, (NameBinding) null);
} else {
Object excludeKey = adapter.getComponentKey();
ComponentAdapter byKey = container.getComponentAdapter((Object)expectedType);
if (byKey != null && !excludeKey.equals(byKey.getComponentKey())) {
result = typeComponentAdapter(byKey);
}
if (result == null && useNames) {
ComponentAdapter found = container.getComponentAdapter(expectedNameBinding.getName());
if ((found != null) && areCompatible(container, expectedType, found) && found != adapter) {
result = found;
}
}
if (result == null) {
List> found = binding == null ? container.getComponentAdapters(expectedType) :
container.getComponentAdapters(expectedType, binding.annotationType());
removeExcludedAdapterIfApplicable(excludeKey, found);
if (found.size() == 0) {
result = noMatchingAdaptersFound(container, expectedType, expectedNameBinding, binding);
} else if (found.size() == 1) {
result = found.get(0);
} else {
throw tooManyMatchingAdaptersFound(expectedType, found);
}
}
}
if (result == null) {
return null;
}
if (!type.isAssignableFrom(result.getComponentImplementation())) {
// if (!(result.getComponentImplementation() == String.class && stringConverters.containsKey(type))) {
if (!(result.getComponentImplementation() == String.class && getConverters(container).canConvert(type))) {
return null;
}
}
return result;
}
@SuppressWarnings({ "unchecked" })
private static ComponentAdapter typeComponentAdapter(ComponentAdapter componentAdapter) {
return (ComponentAdapter)componentAdapter;
}
private ComponentAdapter noMatchingAdaptersFound(PicoContainer container, Class expectedType,
NameBinding expectedNameBinding, Annotation binding) {
if (container.getParent() != null) {
if (binding != null) {
return container.getParent().getComponentAdapter(expectedType, binding.getClass());
} else {
return container.getParent().getComponentAdapter(expectedType, expectedNameBinding);
}
} else {
return null;
}
}
private AbstractInjector.AmbiguousComponentResolutionException tooManyMatchingAdaptersFound(Class expectedType, List> found) {
Class[] foundClasses = new Class[found.size()];
for (int i = 0; i < foundClasses.length; i++) {
foundClasses[i] = found.get(i).getComponentImplementation();
}
AbstractInjector.AmbiguousComponentResolutionException exception = new AbstractInjector.AmbiguousComponentResolutionException(expectedType, foundClasses);
return exception;
}
private void removeExcludedAdapterIfApplicable(Object excludeKey, List> found) {
ComponentAdapter exclude = null;
for (ComponentAdapter work : found) {
if (work.getComponentKey().equals(excludeKey)) {
exclude = work;
break;
}
}
found.remove(exclude);
}
private boolean areCompatible(PicoContainer container, Class expectedType, ComponentAdapter found) {
Class foundImpl = found.getComponentImplementation();
return expectedType.isAssignableFrom(foundImpl) ||
//(foundImpl == String.class && stringConverters.containsKey(expectedType)) ;
(foundImpl == String.class && getConverters(container) != null
&& getConverters(container).canConvert(expectedType)) ;
}
}
© 2015 - 2024 Weber Informatics LLC | Privacy Policy