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1
22
23
24 package com.mchange.v1.xml;
25
26 import java.util.*;
27 import org.xml.sax.*;
28 import org.w3c.dom.*;
29 import com.mchange.v1.util.DebugUtils;
30
31 public final class DomParseUtils
32 {
33 final static boolean DEBUG = true;
34
35
38 public static String  allTextFromUniqueChild(Element elem, String childTagName)
39 throws DOMException
40 { return allTextFromUniqueChild( elem, childTagName, false ); }
41
42
45 public static String allTextFromUniqueChild(Element elem, String childTagName, boolean trim)
46 throws DOMException
47 {
48 Element uniqueChild = uniqueChildByTagName( elem, childTagName );
49 if (uniqueChild == null)
50 return null;
51 else
52 return DomParseUtils.allTextFromElement( uniqueChild, trim );
53 }
54
55 public static Element uniqueChild(Element elem, String childTagName) throws DOMException
56 { return uniqueChildByTagName( elem, childTagName); }
57
58
61 public static Element uniqueChildByTagName(Element elem, String childTagName) throws DOMException
62 {
63 NodeList nl = elem.getElementsByTagName(childTagName);
64 int len = nl.getLength();
65 if (DEBUG)
66 DebugUtils.myAssert( len <= 1 ,
67 "There is more than one (" + len + ") child with tag name: " +
68 childTagName + "!!!" );
69 return (len == 1 ? (Element) nl.item( 0 ) : null);
70 }
71
72 public static String allText(Element elem) throws DOMException
73 { return allTextFromElement( elem ); }
74
75 public static String allText(Element elem, boolean trim) throws DOMException
76 { return allTextFromElement( elem, trim ); }
77
78
79 public static String allTextFromElement(Element elem) throws DOMException
80 { return allTextFromElement( elem, false); }
81
82
83 public static String allTextFromElement(Element elem, boolean trim) throws DOMException
84 {
85 StringBuffer textBuf = new StringBuffer ();
86 NodeList nl = elem.getChildNodes();
87 for (int j = 0, len = nl.getLength(); j < len; ++j)
88 {
89 Node node = nl.item(j);
90 if (node instanceof Text) textBuf.append(node.getNodeValue());
92 }
93 String out = textBuf.toString();
94 return ( trim ? out.trim() : out );
95 }
96
97 public static String [] allTextFromImmediateChildElements( Element parent, String tagName )
98 throws DOMException
99 { return allTextFromImmediateChildElements( parent, tagName, false ); }
100
101 public static String [] allTextFromImmediateChildElements( Element parent, String tagName, boolean trim )
102 throws DOMException
103 {
104 NodeList nl = immediateChildElementsByTagName( parent, tagName );
105 int len = nl.getLength();
106 String [] out = new String [ len ];
107 for (int i = 0; i < len; ++i)
108 out[i] = allText( (Element) nl.item(i), trim );
109 return out;
110 }
111
112
113 public static NodeList immediateChildElementsByTagName( Element parent, String tagName )
114 throws DOMException
115 { return getImmediateChildElementsByTagName( parent, tagName ); }
116
117
120 public static NodeList getImmediateChildElementsByTagName( Element parent, String tagName )
121 throws DOMException
122 {
123 final List nodes = new ArrayList();
124 for (Node child = parent.getFirstChild(); child != null; child = child.getNextSibling())
125 if (child instanceof Element && ((Element) child).getTagName().equals(tagName))
126 nodes.add(child);
127 return new NodeList()
128 {
129 public int getLength()
130 { return nodes.size(); }
131
132 public Node item( int i )
133 { return (Node) nodes.get( i ); }
134 };
135 }
136
137 public static String allTextFromUniqueImmediateChild(Element elem, String childTagName)
138 throws DOMException
139 {
140 Element uniqueChild = uniqueImmediateChildByTagName( elem, childTagName );
141 if (uniqueChild == null)
142 return null;
143 return DomParseUtils.allTextFromElement( uniqueChild );
144 }
145
146 public static Element uniqueImmediateChild(Element elem, String childTagName)
147 throws DOMException
148 { return uniqueImmediateChildByTagName( elem, childTagName); }
149
150
153 public static Element uniqueImmediateChildByTagName(Element elem, String childTagName)
154 throws DOMException
155 {
156 NodeList nl = getImmediateChildElementsByTagName(elem, childTagName);
157 int len = nl.getLength();
158 if (DEBUG)
159 DebugUtils.myAssert( len <= 1 ,
160 "There is more than one (" + len + ") child with tag name: " +
161 childTagName + "!!!" );
162 return (len == 1 ? (Element) nl.item( 0 ) : null);
163 }
164
165
168 public static String attrValFromElement(Element element, String attrName)
169 throws DOMException
170 {
171 Attr attr = element.getAttributeNode( attrName );
172 return (attr == null ? null : attr.getValue());
173 }
174
175 private DomParseUtils()
176 {}
177 }
178
179
180 |
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