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/**
* Copyright (C) 2011 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.inject.spi;
import java.util.List;
import com.google.inject.Binder;
import com.google.inject.Key;
import com.google.common.collect.ImmutableList;
import com.google.inject.matcher.Matcher;
/**
* Binds keys (picked using a Matcher) to a provision listener. Listeners are created explicitly in
* a module using {@link Binder#bindListener(Matcher, ProvisionListener)} statements:
*
* @author sameb@google.com (Sam Berlin)
* @since 4.0
*/
public final class ProvisionListenerBinding implements Element {
private final Object source;
private final Matcher<? super Key<?>> keyMatcher;
private final List<ProvisionListener> listeners;
ProvisionListenerBinding(Object source,
Matcher<? super Key<?>> typeMatcher,
ProvisionListener[] listeners) {
this.source = source;
this.keyMatcher = typeMatcher;
this.listeners = ImmutableList.of(listeners);
}
/** Returns the registered listeners. */
public List<ProvisionListener> getListeners() {
return listeners;
}
/** Returns the key matcher which chooses which keys the listener should be notified of. */
public Matcher<? super Key<?>> getKeyMatcher() {
return keyMatcher;
}
public Object getSource() {
return source;
}
public <R> R acceptVisitor(ElementVisitor<R> visitor) {
return visitor.visit(this);
}
public void applyTo(Binder binder) {
binder.withSource(getSource()).bindListener(keyMatcher,
listeners.toArray(new ProvisionListener[listeners.size()]));
}
}
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