1 /*
   2  * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package com.sun.tools.internal.xjc.generator.util;
  27 
  28 import com.sun.codemodel.internal.JCodeModel;
  29 import com.sun.codemodel.internal.JExpr;
  30 import com.sun.codemodel.internal.JExpression;
  31 import com.sun.codemodel.internal.JStringLiteral;
  32 import com.sun.xml.internal.bind.WhiteSpaceProcessor;
  33 
  34 /**
  35  * Generates code that performs the whitespace normalization.
  36  */
  37 public abstract class WhitespaceNormalizer
  38 {
  39     /**
  40      * Generates the expression that normalizes
  41      * the given expression (which evaluates to java.lang.String).
  42      *
  43      * @param codeModel
  44      *      The owner code model object under which a new expression
  45      *      will be created.
  46      */
  47     public abstract JExpression generate( JCodeModel codeModel, JExpression literal );
  48 
  49     /**
  50      * Parses "preserve","replace" or "collapse" into
  51      * the corresponding WhitespaceNormalizer object.
  52      *
  53      * @param method
  54      *      Either "preserve", "replace", or "collapse"
  55      *
  56      * @exception    IllegalArgumentException
  57      *        when the specified method is invalid.
  58      */
  59     public static WhitespaceNormalizer parse( String method ) {
  60         if( method.equals("preserve") )
  61             return PRESERVE;
  62 
  63         if( method.equals("replace") )
  64             return REPLACE;
  65 
  66         if( method.equals("collapse") )
  67             return COLLAPSE;
  68 
  69         throw new IllegalArgumentException(method);
  70     }
  71 
  72     public static final WhitespaceNormalizer PRESERVE = new WhitespaceNormalizer() {
  73         public JExpression generate( JCodeModel codeModel, JExpression literal ) {
  74             return literal;
  75         }
  76     };
  77 
  78     public static final WhitespaceNormalizer REPLACE = new WhitespaceNormalizer() {
  79         public JExpression generate( JCodeModel codeModel, JExpression literal ) {
  80             // WhitespaceProcessor.replace(<literal>);
  81             if( literal instanceof JStringLiteral )
  82                 // optimize
  83                 return JExpr.lit( WhiteSpaceProcessor.replace(((JStringLiteral)literal).str) );
  84             else
  85                 return codeModel.ref(WhiteSpaceProcessor.class)
  86                     .staticInvoke("replace").arg(literal);
  87         }
  88     };
  89 
  90     public static final WhitespaceNormalizer COLLAPSE = new WhitespaceNormalizer() {
  91         public JExpression generate( JCodeModel codeModel, JExpression literal ) {
  92             // WhitespaceProcessor.replace(<literal>);
  93             if( literal instanceof JStringLiteral )
  94                 // optimize
  95                 return JExpr.lit( WhiteSpaceProcessor.collapse(((JStringLiteral)literal).str) );
  96             else
  97                 return codeModel.ref(WhiteSpaceProcessor.class)
  98                     .staticInvoke("collapse").arg(literal);
  99         }
 100     };
 101 }