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This module contains the Metro runtime code.
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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2017 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://oss.oracle.com/licenses/CDDL+GPL-1.1
 * or 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 LICENSE.txt.
 *
 * GPL Classpath Exception:
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 * 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
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package com.sun.xml.ws.assembler;

import com.sun.istack.logging.Logger;
import com.sun.xml.ws.api.pipe.Pipe;
import com.sun.xml.ws.api.pipe.Tube;
import com.sun.xml.ws.api.pipe.helper.PipeAdapter;
import com.sun.xml.ws.assembler.dev.TubelineAssemblyContext;
import java.text.MessageFormat;

import java.util.LinkedList;
import java.util.List;
import java.util.logging.Level;

/**
 * A base tubeline assembly context class providing common methods for both
 * client and server assembly context classes.
 *
 * @author Marek Potociar (marek.potociar at sun.com)
 */
class TubelineAssemblyContextImpl implements TubelineAssemblyContext {
    private static final Logger LOGGER = Logger.getLogger(TubelineAssemblyContextImpl.class);

    private Tube head;
    private Pipe adaptedHead;
    private List tubes = new LinkedList();

    @Override
    public Tube getTubelineHead() {
        return head;
    }

    @Override
    public Pipe getAdaptedTubelineHead() {
        if (adaptedHead == null) {
            adaptedHead = PipeAdapter.adapt(head);
        }
        return adaptedHead;
    }

    boolean setTubelineHead(Tube newHead) {
        if (newHead == head || newHead == adaptedHead) {
            return false;
        }

        head = newHead;
        tubes.add(head);
        adaptedHead = null;
        
        if (LOGGER.isLoggable(Level.FINER)) {
            LOGGER.finer(MessageFormat.format("Added '{0}' tube instance to the tubeline.", (newHead == null) ? null : newHead.getClass().getName()));
        }

        return true;
    }

    @Override
    public  T getImplementation(Class type) {
        for (Tube tube : tubes) {
            if (type.isInstance(tube)) {
                return type.cast(tube);
            }
        }
        return null;
    }
}