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120 lines
3.0 KiB
120 lines
3.0 KiB
/*
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* Copyright (c) 2004, 2013, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*/
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package javax.xml.bind.annotation.adapters;
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/**
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* Built-in {@link XmlAdapter} to handle <tt>xs:token</tt> and its derived types.
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*
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* <p>
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* This adapter removes leading and trailing whitespaces, then truncate any
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* sequnce of tab, CR, LF, and SP by a single whitespace character ' '.
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*
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* @author Kohsuke Kawaguchi
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* @since JAXB 2.0
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*/
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public class CollapsedStringAdapter extends XmlAdapter<String,String> {
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/**
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* Removes leading and trailing whitespaces of the string
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* given as the parameter, then truncate any
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* sequnce of tab, CR, LF, and SP by a single whitespace character ' '.
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*/
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public String unmarshal(String text) {
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if(text==null) return null; // be defensive
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int len = text.length();
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// most of the texts are already in the collapsed form.
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// so look for the first whitespace in the hope that we will
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// never see it.
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int s=0;
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while(s<len) {
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if(isWhiteSpace(text.charAt(s)))
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break;
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s++;
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}
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if(s==len)
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// the input happens to be already collapsed.
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return text;
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// we now know that the input contains spaces.
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// let's sit down and do the collapsing normally.
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StringBuilder result = new StringBuilder(len /*allocate enough size to avoid re-allocation*/ );
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if(s!=0) {
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for( int i=0; i<s; i++ )
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result.append(text.charAt(i));
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result.append(' ');
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}
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boolean inStripMode = true;
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for (int i = s+1; i < len; i++) {
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char ch = text.charAt(i);
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boolean b = isWhiteSpace(ch);
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if (inStripMode && b)
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continue; // skip this character
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inStripMode = b;
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if (inStripMode)
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result.append(' ');
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else
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result.append(ch);
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}
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// remove trailing whitespaces
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len = result.length();
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if (len > 0 && result.charAt(len - 1) == ' ')
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result.setLength(len - 1);
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// whitespaces are already collapsed,
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// so all we have to do is to remove the last one character
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// if it's a whitespace.
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return result.toString();
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}
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/**
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* No-op.
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*
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* Just return the same string given as the parameter.
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*/
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public String marshal(String s) {
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return s;
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}
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/** returns true if the specified char is a white space character. */
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protected static boolean isWhiteSpace(char ch) {
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// most of the characters are non-control characters.
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// so check that first to quickly return false for most of the cases.
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if( ch>0x20 ) return false;
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// other than we have to do four comparisons.
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return ch == 0x9 || ch == 0xA || ch == 0xD || ch == 0x20;
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}
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}
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