OAuthProviderInjectionProvider.java

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package com.sun.jersey.oauth.server;

import com.sun.jersey.api.core.ResourceConfig;
import com.sun.jersey.core.spi.component.ComponentContext;
import com.sun.jersey.core.spi.component.ComponentScope;
import com.sun.jersey.core.util.LazyVal;
import com.sun.jersey.oauth.server.api.OAuthServerFilter;
import com.sun.jersey.oauth.server.spi.OAuthProvider;
import com.sun.jersey.spi.inject.ConstrainedTo;
import com.sun.jersey.spi.inject.Injectable;
import com.sun.jersey.spi.inject.InjectableProvider;
import com.sun.jersey.spi.inject.ServerSide;
import java.lang.reflect.Type;
import javax.ws.rs.core.Context;
import javax.ws.rs.ext.Provider;

/** Provider that handles the injection of the application-specific {@link OAuthProvider}
 * implementation.
 *
 * @author Martin Matula
 */
@Provider
@ConstrainedTo(ServerSide.class)
public class OAuthProviderInjectionProvider implements Injectable<OAuthProvider>, InjectableProvider<Context, Type> {
    private @Context ResourceConfig rc;

    private final LazyVal<OAuthProvider> instance = new LazyVal<OAuthProvider>() {
        @Override
        protected OAuthProvider instance() {
            // first find out what class is registered
            String providerClassName = (String) rc.getProperty(OAuthServerFilter.PROPERTY_PROVIDER);
            if (providerClassName == null) {
                throw new RuntimeException("Missing OAuthProvider class name in the configuration. Make sure '" + OAuthServerFilter.PROPERTY_PROVIDER + "' property is set.");
            }
            Class providerClass;
            try {
                providerClass = Class.forName(providerClassName, true, Thread.currentThread().getContextClassLoader());
            } catch (ClassNotFoundException ex) {
                throw new RuntimeException("Could not load OAuthProvider implementation: " + ex.getMessage(), ex);
            }

            OAuthProvider provider = null;
            for (Object obj : rc.getProviderSingletons()) {
                if (obj.getClass() == providerClass) {
                    provider = (OAuthProvider) obj;
                    break;
                }
            }
            if (provider == null) {
                try {
                    provider = (OAuthProvider) providerClass.newInstance();
                } catch (Exception ex) {
                    throw new RuntimeException("Could not instantiate OAuthProvider class", ex);
                }
            }
            return provider;
        }
    };

    @Override
    public OAuthProvider getValue() {
        return instance.get();
    }

    @Override
    public ComponentScope getScope() {
        return ComponentScope.Singleton;
    }

    @Override
    public Injectable getInjectable(ComponentContext cc, Context a, Type t) {
        if (t instanceof Class) {
            Class c = (Class) t;
            if (OAuthProvider.class.isAssignableFrom(c) && c.isInstance(instance.get())) {
                return this;
            }
        }

        return null;
    }
}