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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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/*
 * Copyright (c) 2010, 2019 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0, which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

package org.glassfish.jersey.message.internal;

/**
 * Internal {@link StringBuilder string builder} utilities for building HTTP header
 * values.
 *
 * @author Marc Hadley
 * @author Marek Potociar
 * @author Martin Matula
 */
public class StringBuilderUtils {

    /**
     * Append a new value to the string builder.
     *
     * If the value contains non-token characters (e.g. control, white-space,
     * quotes, separators, etc.), the appended value is quoted and all the quotes
     * in the value are escaped.
     *
     * @param b string builder to be updated.
     * @param value value to be appended.
     */
    public static void appendQuotedIfNonToken(StringBuilder b, String value) {
        if (value == null) {
            return;
        }
        boolean quote = !GrammarUtil.isTokenString(value);
        if (quote) {
            b.append('"');
        }
        appendEscapingQuotes(b, value);
        if (quote) {
            b.append('"');
        }
    }

    /**
     * Append a new value to the string builder.
     *
     * If the value contains white-space characters, the appended
     * value is quoted and all the quotes in the value are escaped.
     *
     * @param b string builder to be updated.
     * @param value value to be appended.
     */
    public static void appendQuotedIfWhitespace(StringBuilder b, String value) {
        if (value == null) {
            return;
        }
        boolean quote = GrammarUtil.containsWhiteSpace(value);
        if (quote) {
            b.append('"');
        }
        appendEscapingQuotes(b, value);
        if (quote) {
            b.append('"');
        }
    }

    /**
     * Append a new quoted value to the string builder.
     *
     * The appended value is quoted and all the quotes in the value are escaped.
     *
     * @param b string builder to be updated.
     * @param value value to be appended.
     */
    public static void appendQuoted(StringBuilder b, String value) {
        b.append('"');
        appendEscapingQuotes(b, value);
        b.append('"');
    }

    /**
     * Append a new value to the string builder.
     *
     * All the quotes in the value are escaped before appending.
     *
     * @param b string builder to be updated.
     * @param value value to be appended.
     */
    public static void appendEscapingQuotes(StringBuilder b, String value) {
        for (int i = 0; i < value.length(); i++) {
            char c = value.charAt(i);
            if (c == '"') {
                b.append('\\');
            }
            b.append(c);
        }
    }

    /**
     * Prevents instantiation.
     */
    private StringBuilderUtils() {
    }
}