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A bundle project producing JAX-RS RI bundles. The primary artifact is an "all-in-one" OSGi-fied JAX-RS RI bundle (jaxrs-ri.jar). Attached to that are two compressed JAX-RS RI archives. The first archive (jaxrs-ri.zip) consists of binary RI bits and contains the API jar (under "api" directory), RI libraries (under "lib" directory) as well as all external RI dependencies (under "ext" directory). The secondary archive (jaxrs-ri-src.zip) contains buildable JAX-RS RI source bundle and contains the API jar (under "api" directory), RI sources (under "src" directory) as well as all external RI dependencies (under "ext" directory). The second archive also contains "build.xml" ANT script that builds the RI sources. To build the JAX-RS RI simply unzip the archive, cd to the created jaxrs-ri directory and invoke "ant" from the command line.

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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2010-2013 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:
 * 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:
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 * 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.glassfish.jersey.message.internal;

import java.util.Collections;
import java.util.Iterator;
import java.util.List;

import javax.ws.rs.core.AbstractMultivaluedMap;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.RuntimeDelegate;
import javax.ws.rs.ext.RuntimeDelegate.HeaderDelegate;

import org.glassfish.jersey.internal.util.collection.ImmutableMultivaluedMap;
import org.glassfish.jersey.internal.util.collection.StringKeyIgnoreCaseMultivaluedMap;

import com.google.common.base.Function;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;

/**
 * Utility class supporting the processing of message headers.
 *
 * @author Marek Potociar (marek.potociar at oracle.com)
 * @author Michal Gajdos (michal.gajdos at oracle.com)
 */
public final class HeadersFactory {

    /**
     * Create an empty inbound message headers container. Created container is mutable.
     *
     * @return a new empty mutable container for storing inbound message headers.
     */
    public static AbstractMultivaluedMap createInbound() {
        return new StringKeyIgnoreCaseMultivaluedMap();
    }

    /**
     * Get immutable empty message headers container. The factory method can be
     * used to for both message header container types  –  inbound
     * as well as outbound.
     *
     * @param  header value type. Typically {@link Object} in case of the outbound
     *            headers and {@link String} in case of the inbound headers.
     * @return an immutable empty message headers container.
     */
    public static  MultivaluedMap empty() {
        return ImmutableMultivaluedMap.empty();
    }

    /**
     * Create an empty outbound message headers container. Created container is mutable.
     *
     * @return a new empty mutable container for storing outbound message headers.
     */
    public static AbstractMultivaluedMap createOutbound() {
        return new StringKeyIgnoreCaseMultivaluedMap();
    }

    /**
     * Convert a message header value, represented as a general object, to it's
     * string representation. If the supplied header value is {@code null},
     * this method returns {@code null}.
     * 

     * This method defers to {@link RuntimeDelegate#createHeaderDelegate} to
     * obtain a {@link HeaderDelegate} to convert the value to a {@code String}.
     * If a {@link HeaderDelegate} is not found then the {@code toString()}
     * method on the header object is utilized.
     *
     * @param headerValue the header value represented as an object.
     * @param rd          runtime delegate instance to be used for header delegate
     *                    retrieval. If {@code null}, a default {@code RuntimeDelegate}
     *                    instance will be {@link RuntimeDelegate#getInstance() obtained} and
     *                    used.
     * @return the string representation of the supplied header value or {@code null}
     *         if the supplied header value is {@code null}.
     */
    @SuppressWarnings("unchecked")
    public static String asString(final Object headerValue, RuntimeDelegate rd) {
        if (headerValue == null) {
            return null;
        }
        if (headerValue instanceof String) {
            return (String) headerValue;
        }
        if (rd == null) {
            rd = RuntimeDelegate.getInstance();
        }

        final HeaderDelegate hp = rd.createHeaderDelegate(headerValue.getClass());
        return (hp != null) ? hp.toString(headerValue) : headerValue.toString();
    }

    /**
     * Returns string view of list of header values. Any modifications to the underlying list are visible to the view,
     * the view also supports removal of elements. Does not support other modifications.
     *
     * @param headerValues header values.
     * @param rd           RuntimeDelegate instance or {@code null} (in that case {@link RuntimeDelegate#getInstance()}
     *                     will be called for before element conversion.
     * @return String view of header values.
     */
    public static List asStringList(final List headerValues, final RuntimeDelegate rd) {
        if (headerValues == null || headerValues.isEmpty()) {
            return Collections.emptyList();
        }

        final RuntimeDelegate delegate;
        if (rd == null) {
            delegate = RuntimeDelegate.getInstance();
        } else {
            delegate = rd;
        }

        return Lists.transform(headerValues, new Function() {
            @Override
            public String apply(Object input) {
                return (input == null) ? "[null]" : HeadersFactory.asString(input, delegate);
            }

        });
    }

    /**
     * Returns string view of passed headers. Any modifications to the headers are visible to the view, the view also
     * supports removal of elements. Does not support other modifications.
     *
     * @param headers headers.
     * @return String view of headers or {@code null} if {code headers} input parameter is {@code null}.
     */
    public static MultivaluedMap asStringHeaders(final MultivaluedMap headers) {
        if (headers == null) {
            return null;
        }

        final RuntimeDelegate rd = RuntimeDelegate.getInstance();
        return new AbstractMultivaluedMap(
                Maps.transformValues(headers, new Function, List>() {
                    @Override
                    public List apply(List input) {
                        return HeadersFactory.asStringList(input, rd);
                    }
                })
        ) {
        };
    }

    /**
     * Converts a list of message header values to a single string value (with individual values separated by
     * {@code ','}).
     *
     * Each single header value is converted to String using a
     * {@link javax.ws.rs.ext.RuntimeDelegate.HeaderDelegate} if one is available
     * via {@link javax.ws.rs.ext.RuntimeDelegate#createHeaderDelegate(java.lang.Class)}
     * for the header value class or using its {@code toString()} method if a header
     * delegate is not available.
     *
     * @param values list of individual header values.
     * @param rd     {@link RuntimeDelegate} instance or {@code null} (in that case {@link RuntimeDelegate#getInstance()}
     *               will be called for before conversion of elements).
     * @return single string consisting of all the values passed in as a parameter. If values parameter is {@code null},
     *         {@code null} is returned. If the list of values is empty, an empty string is returned.
     */
    public static String asHeaderString(List values, RuntimeDelegate rd) {
        if (values == null) {
            return null;
        }
        final Iterator stringValues = asStringList(values, rd).iterator();
        if (!stringValues.hasNext()) {
            return "";
        }

        StringBuilder buffer = new StringBuilder(stringValues.next());
        while (stringValues.hasNext()) {
            buffer.append(',').append(stringValues.next());
        }

        return buffer.toString();
    }

    /**
     * Preventing instantiation.
     */
    private HeadersFactory() {
    }
}
 















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