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src/share/jaxws_classes/com/sun/xml/internal/bind/WhiteSpaceProcessor.java@9c07ef4934dd (annotated)

src/share/jaxws_classes/com/sun/xml/internal/bind/WhiteSpaceProcessor.java

Thu, 31 Aug 2017 15:18:52 +0800

author

aoqi

date

Thu, 31 Aug 2017 15:18:52 +0800

changeset 637

9c07ef4934dd

parent 368

0989ad8c0860

parent 0

373ffda63c9a

permissions

-rw-r--r--

merge

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
aoqi@0	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0	4	*
aoqi@0	5	* This code is free software; you can redistribute it and/or modify it
aoqi@0	6	* under the terms of the GNU General Public License version 2 only, as
aoqi@0	7	* published by the Free Software Foundation. Oracle designates this
aoqi@0	8	* particular file as subject to the "Classpath" exception as provided
aoqi@0	9	* by Oracle in the LICENSE file that accompanied this code.
aoqi@0	10	*
aoqi@0	11	* This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0	12	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0	13	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0	14	* version 2 for more details (a copy is included in the LICENSE file that
aoqi@0	15	* accompanied this code).
aoqi@0	16	*
aoqi@0	17	* You should have received a copy of the GNU General Public License version
aoqi@0	18	* 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0	19	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0	20	*
aoqi@0	21	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0	22	* or visit www.oracle.com if you need additional information or have any
aoqi@0	23	* questions.
aoqi@0	24	*/
aoqi@0	25
aoqi@0	26	package com.sun.xml.internal.bind;
aoqi@0	27
aoqi@0	28	/**
aoqi@0	29	* Processes white space normalization.
aoqi@0	30	*
aoqi@0	31	* @since 1.0
aoqi@0	32	*/
aoqi@0	33	public abstract class WhiteSpaceProcessor {
aoqi@0	34
aoqi@0	35	// benchmarking (see test/src/ReplaceTest.java in the CVS Attic)
aoqi@0	36	// showed that this code is slower than the current code.
aoqi@0	37	//
aoqi@0	38	// public static String replace(String text) {
aoqi@0	39	// final int len = text.length();
aoqi@0	40	// StringBuffer result = new StringBuffer(len);
aoqi@0	41	//
aoqi@0	42	// for (int i = 0; i < len; i++) {
aoqi@0	43	// char ch = text.charAt(i);
aoqi@0	44	// if (isWhiteSpace(ch))
aoqi@0	45	// result.append(' ');
aoqi@0	46	// else
aoqi@0	47	// result.append(ch);
aoqi@0	48	// }
aoqi@0	49	//
aoqi@0	50	// return result.toString();
aoqi@0	51	// }
aoqi@0	52
aoqi@0	53	public static String replace(String text) {
aoqi@0	54	return replace( (CharSequence)text ).toString();
aoqi@0	55	}
aoqi@0	56
aoqi@0	57	/**
aoqi@0	58	* @since 2.0
aoqi@0	59	*/
aoqi@0	60	public static CharSequence replace(CharSequence text) {
aoqi@0	61	int i=text.length()-1;
aoqi@0	62
aoqi@0	63	// look for the first whitespace char.
aoqi@0	64	while( i>=0 && !isWhiteSpaceExceptSpace(text.charAt(i)) )
aoqi@0	65	i--;
aoqi@0	66
aoqi@0	67	if( i<0 )
aoqi@0	68	// no such whitespace. replace(text)==text.
aoqi@0	69	return text;
aoqi@0	70
aoqi@0	71	// we now know that we need to modify the text.
aoqi@0	72	// allocate a char array to do it.
aoqi@0	73	StringBuilder buf = new StringBuilder(text);
aoqi@0	74
aoqi@0	75	buf.setCharAt(i--,' ');
aoqi@0	76	for( ; i>=0; i-- )
aoqi@0	77	if( isWhiteSpaceExceptSpace(buf.charAt(i)))
aoqi@0	78	buf.setCharAt(i,' ');
aoqi@0	79
aoqi@0	80	return new String(buf);
aoqi@0	81	}
aoqi@0	82
aoqi@0	83	/**
aoqi@0	84	* Equivalent of {@link String#trim()}.
aoqi@0	85	* @since 2.0
aoqi@0	86	*/
aoqi@0	87	public static CharSequence trim(CharSequence text) {
aoqi@0	88	int len = text.length();
aoqi@0	89	int start = 0;
aoqi@0	90
aoqi@0	91	while( start<len && isWhiteSpace(text.charAt(start)) )
aoqi@0	92	start++;
aoqi@0	93
aoqi@0	94	int end = len-1;
aoqi@0	95
aoqi@0	96	while( end>start && isWhiteSpace(text.charAt(end)) )
aoqi@0	97	end--;
aoqi@0	98
aoqi@0	99	if(start==0 && end==len-1)
aoqi@0	100	return text; // no change
aoqi@0	101	else
aoqi@0	102	return text.subSequence(start,end+1);
aoqi@0	103	}
aoqi@0	104
aoqi@0	105	public static String collapse(String text) {
aoqi@0	106	return collapse( (CharSequence)text ).toString();
aoqi@0	107	}
aoqi@0	108
aoqi@0	109	/**
aoqi@0	110	* This is usually the biggest processing bottleneck.
aoqi@0	111	*
aoqi@0	112	* @since 2.0
aoqi@0	113	*/
aoqi@0	114	public static CharSequence collapse(CharSequence text) {
aoqi@0	115	int len = text.length();
aoqi@0	116
aoqi@0	117	// most of the texts are already in the collapsed form.
aoqi@0	118	// so look for the first whitespace in the hope that we will
aoqi@0	119	// never see it.
aoqi@0	120	int s=0;
aoqi@0	121	while(s<len) {
aoqi@0	122	if(isWhiteSpace(text.charAt(s)))
aoqi@0	123	break;
aoqi@0	124	s++;
aoqi@0	125	}
aoqi@0	126	if(s==len)
aoqi@0	127	// the input happens to be already collapsed.
aoqi@0	128	return text;
aoqi@0	129
aoqi@0	130	// we now know that the input contains spaces.
aoqi@0	131	// let's sit down and do the collapsing normally.
aoqi@0	132
aoqi@0	133	StringBuilder result = new StringBuilder(len /*allocate enough size to avoid re-allocation*/ );
aoqi@0	134
aoqi@0	135	if(s!=0) {
aoqi@0	136	for( int i=0; i<s; i++ )
aoqi@0	137	result.append(text.charAt(i));
aoqi@0	138	result.append(' ');
aoqi@0	139	}
aoqi@0	140
aoqi@0	141	boolean inStripMode = true;
aoqi@0	142	for (int i = s+1; i < len; i++) {
aoqi@0	143	char ch = text.charAt(i);
aoqi@0	144	boolean b = isWhiteSpace(ch);
aoqi@0	145	if (inStripMode && b)
aoqi@0	146	continue; // skip this character
aoqi@0	147
aoqi@0	148	inStripMode = b;
aoqi@0	149	if (inStripMode)
aoqi@0	150	result.append(' ');
aoqi@0	151	else
aoqi@0	152	result.append(ch);
aoqi@0	153	}
aoqi@0	154
aoqi@0	155	// remove trailing whitespaces
aoqi@0	156	len = result.length();
aoqi@0	157	if (len > 0 && result.charAt(len - 1) == ' ')
aoqi@0	158	result.setLength(len - 1);
aoqi@0	159	// whitespaces are already collapsed,
aoqi@0	160	// so all we have to do is to remove the last one character
aoqi@0	161	// if it's a whitespace.
aoqi@0	162
aoqi@0	163	return result;
aoqi@0	164	}
aoqi@0	165
aoqi@0	166	/**
aoqi@0	167	* Returns true if the specified string is all whitespace.
aoqi@0	168	*/
aoqi@0	169	public static boolean isWhiteSpace(CharSequence s) {
aoqi@0	170	for( int i=s.length()-1; i>=0; i-- )
aoqi@0	171	if(!isWhiteSpace(s.charAt(i)))
aoqi@0	172	return false;
aoqi@0	173	return true;
aoqi@0	174	}
aoqi@0	175
aoqi@0	176	/** returns true if the specified char is a white space character. */
aoqi@0	177	public static boolean isWhiteSpace(char ch) {
aoqi@0	178	// most of the characters are non-control characters.
aoqi@0	179	// so check that first to quickly return false for most of the cases.
aoqi@0	180	if( ch>0x20 ) return false;
aoqi@0	181
aoqi@0	182	// other than we have to do four comparisons.
aoqi@0	183	return ch == 0x9 || ch == 0xA || ch == 0xD || ch == 0x20;
aoqi@0	184	}
aoqi@0	185
aoqi@0	186	/**
aoqi@0	187	* Returns true if the specified char is a white space character
aoqi@0	188	* but not 0x20.
aoqi@0	189	*/
aoqi@0	190	protected static boolean isWhiteSpaceExceptSpace(char ch) {
aoqi@0	191	// most of the characters are non-control characters.
aoqi@0	192	// so check that first to quickly return false for most of the cases.
aoqi@0	193	if( ch>=0x20 ) return false;
aoqi@0	194
aoqi@0	195	// other than we have to do four comparisons.
aoqi@0	196	return ch == 0x9 || ch == 0xA || ch == 0xD;
aoqi@0	197	}
aoqi@0	198	}