All Downloads are FREE. Search and download functionalities are using the official Maven repository.

org.jboss.weld.event.ResolvedObservers Maven / Gradle / Ivy

Go to download

There is a newer version: 3.0.0.Alpha1
Show newest version
/*
 * JBoss, Home of Professional Open Source
 * Copyright 2014, Red Hat, Inc., and individual contributors
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * 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 org.jboss.weld.event;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Set;

import javax.enterprise.event.TransactionPhase;
import javax.enterprise.inject.spi.EventMetadata;
import javax.enterprise.inject.spi.ObserverMethod;

import org.jboss.weld.util.Observers;
import org.jboss.weld.util.collections.ImmutableList;
import org.jboss.weld.util.collections.ImmutableSet;

/**
 * Immutable information about observer methods resolved for a type/qualifiers combination.
 *
 * @author Jozef Hartinger
 *
 * @param  the event type
 */
public class ResolvedObservers {

    private static final ResolvedObservers EMPTY = new ResolvedObservers(Collections.>emptyList(), Collections.>emptyList(), false) {
        public boolean isEmpty() {
            return true;
        }
    };

    @SuppressWarnings("unchecked")
    public static  ResolvedObservers of(Set> observers) {
        if (observers.isEmpty()) {
            return (ResolvedObservers) EMPTY;
        }
        boolean metadataRequired = false;
        List> immediateObservers = new ArrayList>();
        List> transactionObservers = new ArrayList>();
        for (ObserverMethod observer : observers) {
            if (TransactionPhase.IN_PROGRESS == observer.getTransactionPhase()) {
                immediateObservers.add(observer);
            } else {
                transactionObservers.add(observer);
            }
            if (!metadataRequired && Observers.isEventMetadataRequired(observer)) {
                metadataRequired = true;
            }
        }
        return new ResolvedObservers(ImmutableList.copyOf(immediateObservers), ImmutableList.copyOf(transactionObservers), metadataRequired);
    }

    private final List> immediateObservers;
    private final List> transactionObservers;
    private final boolean metadataRequired;

    private ResolvedObservers(List> immediateObservers, List> transactionObservers, boolean metadataRequired) {
        this.immediateObservers = immediateObservers;
        this.transactionObservers = transactionObservers;
        this.metadataRequired = metadataRequired;
    }

    List> getImmediateObservers() {
        return immediateObservers;
    }

    List> getTransactionObservers() {
        return transactionObservers;
    }

    /**
     * Indicates whether any of the resolved observer methods is either an extension-provided one or declares an explicit {@link EventMetadata} injection point.
     * @return true iff any of the resolved observer methods requires event metadata
     */
    boolean isMetadataRequired() {
        return metadataRequired;
    }

    /**
     * Indicates whether this object represents an empty set of observer methods.
     * @return true iff this object represents an empty set of observer methods
     */
    public boolean isEmpty() {
        return false;
    }

    /**
     * Returns all observer methods.
     */
    public Set> getAllObservers() {
        return ImmutableSet.>builder().addAll(immediateObservers).addAll(transactionObservers).build();
    }
}
    

    

    
            
    
            







    
© 2015 - 2024 Weber Informatics LLC | Privacy Policy