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1466
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1 package goodjava.xml;
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2
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3 import java.util.Map;
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4
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5
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6 public final class XmlElement {
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7 public final String name;
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8 public final Map<String,String> attributes;
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9 public final Object content;
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10
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11 public XmlElement(String name,Map<String,String> attributes) {
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12 this.name = name;
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13 this.attributes = attributes;
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14 this.content = null;
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15 }
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16
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17 public XmlElement(String name,Map<String,String> attributes,String content) {
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18 if( content == null )
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19 throw new IllegalArgumentException("content can't be null");
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20 this.name = name;
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21 this.attributes = attributes;
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22 this.content = content;
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23 }
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24
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25 public XmlElement(String name,Map<String,String> attributes,XmlElement[] content) {
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26 if( content == null )
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27 throw new IllegalArgumentException("content can't be null");
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28 if( content.length == 0 )
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29 throw new IllegalArgumentException("content can't be empty");
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30 this.name = name;
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31 this.attributes = attributes;
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32 this.content = content;
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33 }
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34
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35 public String toString() {
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36 StringBuilder sb = new StringBuilder();
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37 toString(sb,0);
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38 return sb.toString();
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39 }
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40
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41 private void toString(StringBuilder sb,int indented) {
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42 indent(sb,indented);
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43 sb.append( '<' );
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44 sb.append( name );
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45 for( Map.Entry<String,String> attribute : attributes.entrySet() ) {
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46 sb.append( ' ' );
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47 sb.append( attribute.getKey() );
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48 sb.append( "=\"" );
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49 sb.append( encode(attribute.getValue()) );
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50 sb.append( '"' );
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51 }
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52 if( content == null ) {
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53 sb.append( "/>\n" );
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54 } else if( content instanceof String ) {
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55 sb.append( '>' );
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56 String s = (String)content;
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57 sb.append( encode(s) );
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58 closeTag(sb,name);
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59 } else {
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60 sb.append( '>' );
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61 XmlElement[] elements = (XmlElement[])content;
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62 sb.append( '\n' );
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63 for( XmlElement element : elements ) {
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64 element.toString(sb,indented+1);
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65 }
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66 indent(sb,indented);
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67 closeTag(sb,name);
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68 }
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69 }
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70
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71 private static void closeTag(StringBuilder sb,String name) {
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72 sb.append( "</" );
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73 sb.append( name );
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74 sb.append( ">\n" );
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75 }
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76
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77 private static void indent(StringBuilder sb,int indented) {
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78 for( int i=0; i<indented; i++ ) {
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79 sb.append('\t');
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80 }
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81 }
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82
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83 private static String encode(String s) {
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84 final char[] a = s.toCharArray();
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85 StringBuilder buf = new StringBuilder();
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86 for( int i=0; i<a.length; i++ ) {
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87 char c = a[i];
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88 switch(c) {
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89 case '&':
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90 buf.append("&");
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91 break;
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92 case '<':
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93 buf.append("<");
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94 break;
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95 case '>':
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96 buf.append(">");
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97 break;
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98 case '"':
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99 buf.append(""");
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100 break;
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101 default:
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102 buf.append(c);
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103 }
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104 }
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105 return buf.toString();
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106 }
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107
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108 }
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