/**

* Jooby https://jooby.io

* Apache License Version 2.0 https://jooby.io/LICENSE.txt

* Copyright 2014 Edgar Espina

*/

package io.jooby;

import javax.annotation.Nonnull;

import javax.annotation.Nullable;

import java.util.Objects;

/**

* Utility class to access application services.

*

* @param <T> Service type.

*/

public final class ServiceKey<T> {

private final Class<T> type;

private final int hashCode;

private final String name;

private ServiceKey(Class<T> type, String name) {

this.type = type;

this.name = name;

this.hashCode = Objects.hash(type, name);

}

/**

* Resource type.

*

* @return Resource type.

*/

public @Nonnull Class<T> getType() {

return type;

}

/**

* Resource name or <code>null</code>.

*

* @return Resource name or <code>null</code>.

*/

public @Nullable String getName() {

return name;

}

@Override public boolean equals(Object obj) {

if (obj instanceof ServiceKey) {

ServiceKey that = (ServiceKey) obj;

return this.type == that.type && Objects.equals(this.name, that.name);

}

return false;

}

@Override public int hashCode() {

return hashCode;

}

@Override public String toString() {

if (name == null) {

return type.getName();

}

return type.getName() + "(" + name + ")";

}

/**

* Creates a resource key.

*

* @param type Resource type.

* @param <T> Type.

* @return A new resource key.

*/

public static @Nonnull <T> ServiceKey<T> key(@Nonnull Class<T> type) {

return new ServiceKey<>(type, null);

}

/**

* Creates a named resource key.

*

* @param type Resource type.

* @param name Resource name.

* @param <T> Type.

* @return A new resource key.

*/

public static @Nonnull <T> ServiceKey<T> key(@Nonnull Class<T> type, @Nonnull String name) {

return new ServiceKey<>(type, name);

}

}