server/core/src/main/java/org/apache/vysper/xmpp/protocol/ResponseStanzaContainerImpl.java

/*
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you 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.apache.vysper.xmpp.protocol;

import static java.util.Optional.ofNullable;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Objects;
import java.util.stream.Collectors;

import org.apache.vysper.xmpp.stanza.Stanza;

/**
 *
 * @author The Apache MINA Project (dev@mina.apache.org)
 */
public class ResponseStanzaContainerImpl implements ResponseStanzaContainer {
    private final List<Stanza> responses;

    public ResponseStanzaContainerImpl(Stanza stanza) {
        this(Collections.singletonList(stanza));
    }

    public ResponseStanzaContainerImpl(List<Stanza> stanzas) {
        this.responses = ofNullable(stanzas).orElse(Collections.emptyList()).stream().filter(Objects::nonNull)
                .collect(Collectors.toList());
    }

    @Override
    public List<Stanza> getResponseStanzas() {
        return new ArrayList<>(responses);
    }

    @Override
    public Stanza getUniqueResponseStanza() {
        if (responses.size() > 1) {
            throw new IllegalStateException("Found more than one response");
        }
        return responses.stream().findFirst().orElse(null);
    }

    public boolean hasResponse() {
        return !responses.isEmpty();
    }

    public boolean hasNoResponse() {
        return !hasResponse();
    }

}