Java Architecture for XML Binding (JAXB) is a Java API that allows Java developers to map Java classes to XML representations.

jaxb-api-2.2.12.jar is the JAR file for the JAXB API 2.2 specification. You can download and use it directly without any building process as shown in the last tutorial.

If you want to rebuild the JAR file, you can download the source code at JAXB API Maven Website.

You can also browse the source code below:

⏎ javax/xml/bind/WhiteSpaceProcessor.java

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2007-2013 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:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * 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 javax.xml.bind;

/**
 * Processes white space normalization.
 *
 * @since 1.0
 */
abstract class WhiteSpaceProcessor {

// benchmarking (see test/src/ReplaceTest.java in the CVS Attic)
// showed that this code is slower than the current code.
//
//    public static String replace(String text) {
//        final int len = text.length();
//        StringBuffer result = new StringBuffer(len);
//
//        for (int i = 0; i < len; i++) {
//            char ch = text.charAt(i);
//            if (isWhiteSpace(ch))
//                result.append(' ');
//            else
//                result.append(ch);
//        }
//
//        return result.toString();
//    }

    public static String replace(String text) {
        return replace( (CharSequence)text ).toString();
    }

    /**
     * @since 2.0
     */
    public static CharSequence replace(CharSequence text) {
        int i=text.length()-1;

        // look for the first whitespace char.
        while( i>=0 && !isWhiteSpaceExceptSpace(text.charAt(i)) )
            i--;

        if( i<0 )
            // no such whitespace. replace(text)==text.
            return text;

        // we now know that we need to modify the text.
        // allocate a char array to do it.
        StringBuilder buf = new StringBuilder(text);

        buf.setCharAt(i--,' ');
        for( ; i>=0; i-- )
            if( isWhiteSpaceExceptSpace(buf.charAt(i)))
                buf.setCharAt(i,' ');

        return new String(buf);
    }

    /**
     * Equivalent of {@link String#trim()}.
     * @since 2.0
     */
    public static CharSequence trim(CharSequence text) {
        int len = text.length();
        int start = 0;

        while( start<len && isWhiteSpace(text.charAt(start)) )
            start++;

        int end = len-1;

        while( end>start && isWhiteSpace(text.charAt(end)) )
            end--;

        if(start==0 && end==len-1)
            return text;    // no change
        else
            return text.subSequence(start,end+1);
    }

    public static String collapse(String text) {
        return collapse( (CharSequence)text ).toString();
    }

    /**
     * This is usually the biggest processing bottleneck.
     *
     * @since 2.0
     */
    public static CharSequence collapse(CharSequence text) {
        int len = text.length();

        // most of the texts are already in the collapsed form.
        // so look for the first whitespace in the hope that we will
        // never see it.
        int s=0;
        while(s<len) {
            if(isWhiteSpace(text.charAt(s)))
                break;
            s++;
        }
        if(s==len)
            // the input happens to be already collapsed.
            return text;

        // we now know that the input contains spaces.
        // let's sit down and do the collapsing normally.

        StringBuilder result = new StringBuilder(len /*allocate enough size to avoid re-allocation*/ );

        if(s!=0) {
            for( int i=0; i<s; i++ )
                result.append(text.charAt(i));
            result.append(' ');
        }

        boolean inStripMode = true;
        for (int i = s+1; i < len; i++) {
            char ch = text.charAt(i);
            boolean b = isWhiteSpace(ch);
            if (inStripMode && b)
                continue; // skip this character

            inStripMode = b;
            if (inStripMode)
                result.append(' ');
            else
                result.append(ch);
        }

        // remove trailing whitespaces
        len = result.length();
        if (len > 0 && result.charAt(len - 1) == ' ')
            result.setLength(len - 1);
        // whitespaces are already collapsed,
        // so all we have to do is to remove the last one character
        // if it's a whitespace.

        return result;
    }

    /**
     * Returns true if the specified string is all whitespace.
     */
    public static final boolean isWhiteSpace(CharSequence s) {
        for( int i=s.length()-1; i>=0; i-- )
            if(!isWhiteSpace(s.charAt(i)))
                return false;
        return true;
    }

    /** returns true if the specified char is a white space character. */
    public static final boolean isWhiteSpace(char ch) {
        // most of the characters are non-control characters.
        // so check that first to quickly return false for most of the cases.
        if( ch>0x20 )   return false;

        // other than we have to do four comparisons.
        return ch == 0x9 || ch == 0xA || ch == 0xD || ch == 0x20;
    }

    /**
     * Returns true if the specified char is a white space character
     * but not 0x20.
     */
    protected static final boolean isWhiteSpaceExceptSpace(char ch) {
        // most of the characters are non-control characters.
        // so check that first to quickly return false for most of the cases.
        if( ch>=0x20 )   return false;

        // other than we have to do four comparisons.
        return ch == 0x9 || ch == 0xA || ch == 0xD;
    }
}

⏎ javax/xml/bind/WhiteSpaceProcessor.java

Or download all of them as a single archive file:

File name: jaxb-api-2.2.12-sources.jar
File size: 245023 bytes
Release date: 2014-10-10
Download 

⇒ Download jaxb-api-2.2.12.jar File

⇐ Download JAXB 2.2 Specification and API JAR

⇑ JAXB (Java Architecture for XML Binding) API Specification

⇑⇑ FAQ for jaxb-*.jar - Java Architecture for XML Binding