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/*
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* 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 https://jersey.dev.java.net/CDDL+GPL.html
* or jersey/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at jersey/legal/LICENSE.txt.
* Sun designates this particular file as subject to the "Classpath" exception
* as provided by Sun in the GPL Version 2 section of the License file that
* accompanied this code. If applicable, add the following below the License
* Header, with the fields enclosed by brackets [] replaced by your own
* identifying information: "Portions Copyrighted [year]
* [name of copyright owner]"
*
* Contributor(s):
*
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*/
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 java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
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 Method postConstruct;
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();
this.rci = new ResourceComponentInjector(
sipc,
scope,
ar);
if (ar.getPostConstructMethods().size() > 0) {
this.postConstruct = ar.getPostConstructMethods().get(0);
} else {
this.postConstruct = null;
}
ConstructorInjectablePair cip = getConstructor(sipc, scope, ar);
if (cip == null || cip.is.size() == 0) {
this.constructor = null;
this.injectables = null;
} else {
this.constructor = cip.con;
this.injectables = AbstractHttpContextInjectable.transform(cip.is);
Class[] types = this.constructor.getParameterTypes();
for (int i = 0; i < this.injectables.size(); i++) {
if (this.injectables.get(i) == null) {
final Object defaultValue = DEFAULT_VALUES.get(types[i]);
if (defaultValue != null) {
this.injectables.set(i, new AbstractHttpContextInjectable() {
@Override
public Object getValue(HttpContext c) {
return defaultValue;
}
});
}
}
}
}
}
public Object construct(HttpContext hc)
throws InstantiationException, IllegalAccessException,
IllegalArgumentException, InvocationTargetException {
final Object o = _construct(hc);
rci.inject(hc, o);
if (postConstruct != null)
postConstruct.invoke(o);
return o;
}
public Object _construct(HttpContext hc)
throws InstantiationException, IllegalAccessException,
IllegalArgumentException, InvocationTargetException {
if (constructor == null) {
return 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.getParameters(), scope);
cs.add(new ConstructorInjectablePair(arc.getCtor(), is));
}
return cs.first();
}
private static final Map DEFAULT_VALUES = createDefaultValues();
private static Map createDefaultValues() {
Map defaultValues = new HashMap();
defaultValues.put(byte.class, (byte) 0);
defaultValues.put(short.class, (short) 0);
defaultValues.put(int.class, 0);
defaultValues.put(long.class, (long) 0);
defaultValues.put(float.class, (float)0.0);
defaultValues.put(double.class, 0.0);
defaultValues.put(char.class, '\0');
defaultValues.put(boolean.class, Boolean.FALSE);
return defaultValues;
}
}
