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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2013 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
 * http://glassfish.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:
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 * exception as provided by Oracle in the GPL Version 2 section of the License
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 *
 * Modifications:
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package org.glassfish.jersey.internal.inject;

import java.util.Date;
import java.util.List;

import javax.ws.rs.core.EntityTag;
import javax.ws.rs.core.Request;
import javax.ws.rs.core.Response.ResponseBuilder;
import javax.ws.rs.core.Variant;

import org.glassfish.jersey.internal.LocalizationMessages;

/**
 * Proxiable wrapper for request scoped {@link Request} instance.
 *
 * @author Jakub Podlesak (jakub.podlesak at oracle.com)
 */
public class RequestInjectee implements Request {

    private Request wrapped;

    /**
     * Set wrapped instance. Should be invoked on each incoming request,
     * when a new injectee instance is created by HK2.
     *
     * @param request actual request instance.
     */
    public void set(final Request request) {
        if (wrapped != null) {
            throw new IllegalStateException(LocalizationMessages.REQUEST_WAS_ALREADY_SET());
        }
        wrapped = request;
    }

    @Override
    public String getMethod() {
        checkState();
        return wrapped.getMethod();
    }

    @Override
    public Variant selectVariant(List variants) throws IllegalArgumentException {
        checkState();
        return wrapped.selectVariant(variants);
    }

    @Override
    public ResponseBuilder evaluatePreconditions(EntityTag eTag) {
        checkState();
        return wrapped.evaluatePreconditions(eTag);
    }

    @Override
    public ResponseBuilder evaluatePreconditions(Date lastModified) {
        checkState();
        return wrapped.evaluatePreconditions(lastModified);
    }

    @Override
    public ResponseBuilder evaluatePreconditions(Date lastModified, EntityTag eTag) {
        checkState();
        return wrapped.evaluatePreconditions(lastModified, eTag);
    }

    @Override
    public ResponseBuilder evaluatePreconditions() {
        checkState();
        return wrapped.evaluatePreconditions();
    }

    private void checkState() {
        if (wrapped == null) {
            throw new IllegalStateException(LocalizationMessages.REQUEST_WAS_NOT_SET());
        }
    }

}