Mercurial > jdk8-mips64-public > jaxws / file revision

 /*

  * Copyright (c) 2007, 2013, Oracle and/or its affiliates. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.  Oracle designates this

  * particular file as subject to the "Classpath" exception as provided

  * by Oracle in the LICENSE file that accompanied this code.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

  */

 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;

     }

 }