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*
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* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
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*
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package com.sun.jersey.core.spi.component;
import com.sun.jersey.core.reflection.AnnotatedMethod;
import com.sun.jersey.core.reflection.MethodList;
import com.sun.jersey.core.reflection.ReflectionHelper;
import com.sun.jersey.spi.inject.Injectable;
import com.sun.jersey.spi.inject.InjectableProviderContext;
import com.sun.jersey.spi.inject.Errors;
import java.lang.annotation.Annotation;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.lang.reflect.Type;
import java.security.AccessController;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.SortedSet;
import java.util.TreeSet;
/**
* A constructor of a component.
*
* @param the type to construct
* @author [email protected]
*/
public class ComponentConstructor {
/**
* A tuple of a constructor and the list of injectables associated with
* the parameters of the constructor.
*
* @param the type to construct.
*/
private static class ConstructorInjectablePair {
/**
* The constructor.
*/
private final Constructor con;
/**
* The list of injectables associated with the parameters of the
* constructor;
*/
private final List is;
/**
* Create a new tuple of a constructor and list of injectables.
*
* @param con the constructor
* @param is the list of injectables.
*/
private ConstructorInjectablePair(Constructor con, List is) {
this.con = con;
this.is = is;
}
}
private static class ConstructorComparator implements Comparator> {
@Override
public int compare(ConstructorInjectablePair o1, ConstructorInjectablePair o2) {
int p = Collections.frequency(o1.is, null) - Collections.frequency(o2.is, null);
if (p != 0)
return p;
return o2.con.getParameterTypes().length - o1.con.getParameterTypes().length;
}
}
private final InjectableProviderContext ipc;
private final Class c;
private final List postConstructs;
private final ComponentInjector ci;
public ComponentConstructor(InjectableProviderContext ipc, Class c, ComponentInjector ci) {
this.ipc = ipc;
this.c = c;
this.ci = ci;
this.postConstructs = getPostConstructMethods(c);
}
private static List getPostConstructMethods(Class c) {
Class postConstructClass = AccessController.doPrivileged(ReflectionHelper.classForNamePA("javax.annotation.PostConstruct"));
LinkedList list = new LinkedList();
HashSet names = new HashSet();
if (postConstructClass != null) {
MethodList methodList = new MethodList(c, true);
for (AnnotatedMethod m : methodList.
hasAnnotation(postConstructClass).
hasNumParams(0).
hasReturnType(void.class)) {
Method method = m.getMethod();
// only add method if not hidden/overridden
if (names.add(method.getName())) {
AccessController.doPrivileged(ReflectionHelper.setAccessibleMethodPA(method));
// methods from the superclass should go first, so inserting at the beginning
list.addFirst(method);
}
}
}
return list;
}
/**
* Get a new instance.
*
* @return a new instance.
*/
public T getInstance()
throws InstantiationException, IllegalAccessException,
IllegalArgumentException, InvocationTargetException {
final int modifiers = c.getModifiers();
if (!Modifier.isPublic(modifiers)) {
Errors.nonPublicClass(c);
}
if (Modifier.isAbstract(modifiers)) {
if (Modifier.isInterface(modifiers)) {
Errors.interfaceClass(c);
} else {
Errors.abstractClass(c);
}
}
if (c.getEnclosingClass() != null && !Modifier.isStatic(modifiers)) {
Errors.innerClass(c);
}
if (Modifier.isPublic(modifiers) && !Modifier.isAbstract(modifiers)) {
if (c.getConstructors().length == 0) {
Errors.nonPublicConstructor(c);
}
}
final T t = _getInstance();
ci.inject(t);
for (Method postConstruct : postConstructs) {
postConstruct.invoke(t);
}
return t;
}
private T _getInstance()
throws InstantiationException, IllegalAccessException,
IllegalArgumentException, InvocationTargetException {
ConstructorInjectablePair cip = getConstructor();
if (cip == null || cip.is.isEmpty()) {
return c.newInstance();
} else {
if (cip.is.contains(null)) {
// Missing dependency
for (int i = 0; i < cip.is.size(); i++) {
if (cip.is.get(i) == null) {
Errors.missingDependency(cip.con, i);
}
}
}
Object[] params = new Object[cip.is.size()];
int i = 0;
for (Injectable injectable : cip.is) {
if (injectable != null)
params[i++] = injectable.getValue();
}
return cip.con.newInstance(params);
}
}
/**
* Get the most suitable constructor. The constructor with the most
* parameters and that has the most parameters associated with
* Injectable instances will be chosen.
*
* @param The type to construct.
* @param c the class to instantiate.
* @return a list of constructor and list of injectables for the constructor
* parameters.
*/
private ConstructorInjectablePair getConstructor() {
if (c.getConstructors().length == 0)
return null;
SortedSet> cs = new TreeSet>(
new ConstructorComparator());
AnnotatedContext aoc = new AnnotatedContext();
for (Constructor con : c.getConstructors()) {
List is = new ArrayList();
int ps = con.getParameterTypes().length;
aoc.setAccessibleObject(con);
for (int p = 0; p < ps; p++) {
Type pgtype = con.getGenericParameterTypes()[p];
Annotation[] as = con.getParameterAnnotations()[p];
aoc.setAnnotations(as);
Injectable i = null;
for (Annotation a : as) {
i = ipc.getInjectable(
a.annotationType(), aoc, a, pgtype,
ComponentScope.UNDEFINED_SINGLETON);
}
is.add(i);
}
cs.add(new ConstructorInjectablePair(con, is));
}
return cs.first();
}
}
