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package com.sun.jersey.server.spi.component;
import com.sun.jersey.api.core.HttpContext;
import com.sun.jersey.api.model.AbstractResource;
import com.sun.jersey.api.model.AbstractResourceConstructor;
import com.sun.jersey.core.spi.component.ComponentScope;
import com.sun.jersey.server.impl.inject.AbstractHttpContextInjectable;
import com.sun.jersey.server.impl.inject.ServerInjectableProviderContext;
import com.sun.jersey.spi.inject.Injectable;
import com.sun.jersey.spi.inject.Errors;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.SortedSet;
import java.util.TreeSet;
/**
* A constructor of a resource class.
*
* @author [email protected]
*/
public class ResourceComponentConstructor {
private final Class c;
private final ResourceComponentInjector rci;
private final Constructor constructor;
private final List postConstructs = new ArrayList();
private final List injectables;
/**
* 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 {
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;
}
}
public ResourceComponentConstructor(ServerInjectableProviderContext sipc,
ComponentScope scope, AbstractResource ar) {
this.c = ar.getResourceClass();
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);
}
}
this.rci = new ResourceComponentInjector(
sipc,
scope,
ar);
this.postConstructs.addAll(ar.getPostConstructMethods());
ConstructorInjectablePair cip = getConstructor(sipc, scope, ar);
if (cip == null) {
this.constructor = null;
this.injectables = null;
} else if (cip.is.isEmpty()) {
this.constructor = cip.con;
this.injectables = null;
} 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);
}
}
}
this.constructor = cip.con;
this.injectables = AbstractHttpContextInjectable.transform(cip.is);
}
}
public Class getResourceClass() {
return c;
}
public Object construct(HttpContext hc)
throws InstantiationException, IllegalAccessException,
IllegalArgumentException, InvocationTargetException {
final Object o = _construct(hc);
rci.inject(hc, o);
for (Method postConstruct : postConstructs) {
postConstruct.invoke(o);
}
return o;
}
private Object _construct(HttpContext hc)
throws InstantiationException, IllegalAccessException,
IllegalArgumentException, InvocationTargetException {
if (injectables == null) {
return (constructor != null) ? constructor.newInstance() : c.newInstance();
} else {
Object[] params = new Object[injectables.size()];
int i = 0;
for (AbstractHttpContextInjectable injectable : injectables) {
params[i++] = (injectable != null) ? injectable.getValue(hc) : null;
}
return constructor.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 of the resource.
* @param c the class to instantiate.
* @param ar the abstract resource.
* @param s the scope for which the injectables will be used.
* @return a list constructor and list of injectables for the constructor
* parameters.
*/
@SuppressWarnings("unchecked")
private ConstructorInjectablePair getConstructor(
ServerInjectableProviderContext sipc,
ComponentScope scope,
AbstractResource ar) {
if (ar.getConstructors().isEmpty())
return null;
SortedSet cs = new TreeSet(
new ConstructorComparator());
for (AbstractResourceConstructor arc : ar.getConstructors()) {
List is = sipc.getInjectable(arc.getCtor(), arc.getParameters(), scope);
cs.add(new ConstructorInjectablePair(arc.getCtor(), is));
}
return cs.first();
}
}
