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• Collector.java

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org.jvnet.hk2.internal.Collector Maven / Gradle / Ivy

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2012 Oracle and/or its affiliates. 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://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/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 packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [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 org.jvnet.hk2.internal;

import java.util.LinkedHashSet;
import java.util.LinkedList;

import org.glassfish.hk2.api.MultiException;

/**
 * This class collects errors, and can then also produce a MultiException
 * from those errors if necessary
 * 
 * @author jwells
 */
public class Collector {
    private LinkedHashSet throwables;
    
    public void addMultiException(MultiException me) {
        if (me == null) return;
        if (throwables == null) throwables = new LinkedHashSet();
        
        throwables.addAll(me.getErrors());
    }
    
    /**
     * Adds a throwable to the list of throwables in this collector
     * @param th The throwable to add to the list
     */
    public void addThrowable(Throwable th) {
        if (th == null) return;
        if (throwables == null) throwables = new LinkedHashSet();
        
        if (th instanceof MultiException) {
            throwables.addAll(((MultiException) th).getErrors());
        }
        else {
          throwables.add(th);
        }
    }
    
    /**
     * This method will throw if the list of throwables associated with this
     * collector is not empty
     * 
     * @throws MultiException An exception with all the throwables found in this collector
     */
    public void throwIfErrors() throws MultiException {
        if (throwables == null || throwables.isEmpty()) return;
        
        throw new MultiException(new LinkedList(throwables));
    }
    
    /**
     * Returns true if this collector has errors
     * 
     * @return true if the collector has errors
     */
    public boolean hasErrors() {
        return ((throwables != null) && (!throwables.isEmpty()));
    }
}