Annotation of java/classes/org/w3c/rdf/Element.java, revision 1.6
1.1 jsaarela 1: /**
2: * A simple Element class for storing the element name, attributes
3: * and children.
4: *
1.4 jsaarela 5: * $Log: Element.java,v $
1.6 ! jsaarela 6: * Revision 1.5 1998/08/12 07:54:55 jsaarela
! 7: * Namespace management now corresponds with the W3C Working
! 8: * Draft dated 2-Aug-98.
! 9: *
1.5 jsaarela 10: * Revision 1.4 1998/07/30 13:39:32 jsaarela
11: * multiple internal references fixed,
12: * properties without children fixed.
13: *
1.4 jsaarela 14: * Revision 1.3 1998/07/27 12:20:54 jsaarela
15: * 1st distribution version logged in.
16: *
1.3 jsaarela 17: *
1.1 jsaarela 18: * @author Janne Saarela
19: */
20: package org.w3c.rdf;
21:
22: import java.util.*;
23: import java.io.*;
24: import org.xml.sax.AttributeList;
1.4 jsaarela 25: import org.xml.sax.SAXException;
1.1 jsaarela 26:
27: public class Element
28: {
1.5 jsaarela 29: private String m_sNamespace = null;
1.1 jsaarela 30: private String m_sName = null;
1.6 ! jsaarela 31: private Hashtable m_attributes = new Hashtable();
! 32: private Hashtable m_attributeNamespaces = new Hashtable();
1.1 jsaarela 33: private Vector m_children = new Vector();
1.2 jsaarela 34: private String m_sID = null;
1.4 jsaarela 35: private String m_sBagID = null;
1.1 jsaarela 36: private Hashtable m_nodes = new Hashtable ();
37: private Element m_target = null;
1.2 jsaarela 38: private boolean m_bDone = false;
1.1 jsaarela 39:
40: private static Vector s_resolveQueue = new Vector ();
41: private static Hashtable s_hIDtable = new Hashtable ();
42:
1.2 jsaarela 43: private static int s_iReificationCounter = 0;
44:
45: public static void init () {
46: s_iReificationCounter = 0;
1.3 jsaarela 47: s_resolveQueue.removeAllElements ();
48: s_hIDtable.clear ();
1.2 jsaarela 49: }
50:
1.5 jsaarela 51: public Element (String sNamespace,
52: String sName,
53: AttributeList al) throws SAXException {
54: m_sNamespace = sNamespace;
1.1 jsaarela 55: m_sName = sName;
56:
57: if (al != null) {
58: int iLength = al.getLength ();
59: if (al == null) {
1.3 jsaarela 60: // System.out.println("[Attributes not available]");
1.1 jsaarela 61: } else {
62: for (int x = 0; x < iLength; x++) {
1.6 ! jsaarela 63: String aName = al.getName (x);
! 64: String aValue = al.getValue (x);
! 65: String aNamespace = al.getType (x);
1.1 jsaarela 66:
1.6 ! jsaarela 67: m_attributes.put (aName, aValue);
! 68: m_attributeNamespaces.put (aName, aNamespace);
1.1 jsaarela 69: }
70: }
71: }
72:
73: if (m_attributes != null) {
1.3 jsaarela 74: String sResource = (String)m_attributes.get ("resource");
1.4 jsaarela 75: if (sResource != null && sResource.startsWith("#")) {
76: Element.resolveLater (this);
1.2 jsaarela 77: }
78: String sAboutEach = (String)m_attributes.get ("aboutEach");
79: if (sAboutEach != null && sAboutEach.startsWith("#")) {
1.4 jsaarela 80: Element.resolveLater (this);
1.1 jsaarela 81: }
1.3 jsaarela 82: String sAbout = (String)m_attributes.get ("about");
83: if (sAbout != null) {
84: if (sAbout.startsWith("#")) {
85: Element.resolveLater (this);
86: } else {
87: Element.registerResource (this);
88: }
89: }
1.4 jsaarela 90: String sBagID = (String)m_attributes.get ("bagID");
91: if (sBagID != null) {
1.1 jsaarela 92: Element.registerBag (this);
1.4 jsaarela 93: bagID (sBagID);
1.1 jsaarela 94: }
1.2 jsaarela 95: String sId = (String)m_attributes.get ("ID");
96: if (sId != null) {
97: Element.registerID (this);
1.3 jsaarela 98: ID (sId); // default value
99: }
100:
101: if (sId != null && sAbout != null) {
1.4 jsaarela 102: throw new SAXException ("'ID' and 'about' attribute may not appear within the same Description block");
1.2 jsaarela 103: }
1.1 jsaarela 104: }
105: }
106:
107: public String name() {
108: return m_sName;
109: }
110:
1.5 jsaarela 111: public String namespace () {
112: return m_sNamespace;
113: }
114:
1.1 jsaarela 115: public void addChild (Element e) {
116: m_children.addElement (e);
117: }
118:
119: public Enumeration children () {
120: return m_children.elements();
121: }
122:
1.2 jsaarela 123: public Enumeration attributes () {
124: return m_attributes.keys();
125: }
126:
127: public void addAttribute (String sName, String sValue) {
1.3 jsaarela 128: if (sName == null ||
129: sValue == null)
130: return;
1.2 jsaarela 131: if (m_attributes == null) {
132: m_attributes = new Hashtable ();
133: }
134: m_attributes.put (sName, sValue);
135: }
136:
1.3 jsaarela 137: public void removeAttribute (String sName) {
138: m_attributes.remove (sName);
139: }
140:
1.1 jsaarela 141: public String getAttribute (String sName) {
142: return (String)m_attributes.get (sName);
143: }
144:
1.6 ! jsaarela 145: public String getAttributeNamespace (String sName) {
! 146: return (String)m_attributeNamespaces.get (sName);
! 147: }
! 148:
1.1 jsaarela 149: public String expandName () {
1.5 jsaarela 150: if (m_sNamespace == null ||
151: m_sNamespace.trim().length() == 0) {
152: return m_sName;
1.3 jsaarela 153: } else {
1.6 ! jsaarela 154: return m_sNamespace + m_sName;
1.3 jsaarela 155: }
1.1 jsaarela 156: }
157:
158: public static void resolveLater (Element e) {
159: s_resolveQueue.addElement (e);
160: }
161:
162: public static void resolve () {
163: for (int x = 0; x < s_resolveQueue.size(); x++) {
164: Element e = (Element)s_resolveQueue.elementAt(x);
1.3 jsaarela 165:
1.2 jsaarela 166: String sAbout = e.getAttribute ("about");
167: if (sAbout != null) {
1.3 jsaarela 168: if (sAbout.startsWith ("#"))
169: sAbout = sAbout.substring (1);
1.2 jsaarela 170: Element e2 = (Element)lookforNode(sAbout);
171: if (e2 != null) {
172: e.setTarget (e2);
1.3 jsaarela 173: }
174: }
175:
176: String sResource = e.getAttribute ("resource");
177: if (sResource != null) {
1.4 jsaarela 178: if (sResource.startsWith ("#"))
179: sResource = sResource.substring (1);
1.3 jsaarela 180: Element e2 = (Element)lookforNode(sResource);
181: if (e2 != null) {
182: e.setTarget (e2);
1.2 jsaarela 183: }
184: }
1.3 jsaarela 185:
1.2 jsaarela 186: String sAboutEach = e.getAttribute ("aboutEach");
187: if (sAboutEach != null) {
188: sAboutEach = sAboutEach.substring (1);
189: Element e2 = (Element)lookforNode(sAboutEach);
1.1 jsaarela 190: if (e2 != null) {
191: e.setTarget (e2);
192: }
193: }
194: }
195: s_resolveQueue.removeAllElements();
196: }
197:
1.4 jsaarela 198: public static Element lookforNode (String sID) {
199: if (sID == null)
200: return null;
201: else
202: return (Element)s_hIDtable.get (sID);
1.1 jsaarela 203: }
204:
1.4 jsaarela 205: public static void registerID (Element e) throws SAXException {
1.2 jsaarela 206: if (e.getAttribute ("ID") != null) {
1.4 jsaarela 207: if (s_hIDtable.get (e.getAttribute ("ID")) != null)
208: throw new SAXException ("ID attribute value '"+e.getAttribute("ID")+"' not unique");
209: else
210: s_hIDtable.put (e.getAttribute("ID"), e);
1.1 jsaarela 211: }
212: }
213:
214: public static void registerBag (Element e) {
1.2 jsaarela 215: if (e.getAttribute ("bagID") != null) {
216: s_hIDtable.put (e.getAttribute ("bagID"), e);
1.1 jsaarela 217: }
218: }
1.3 jsaarela 219:
220: public static void registerResource (Element e) {
221: if (e.getAttribute ("about") != null) {
222: s_hIDtable.put (e.getAttribute ("about"), e);
223: }
224: }
225:
1.1 jsaarela 226:
227: public void setTarget (Element e) {
228: m_target = e;
229: }
230:
231: public Element target () {
232: return m_target;
233: }
234:
235: static public String newReificationID () {
236: s_iReificationCounter++;
237: return new String ("genid" + s_iReificationCounter);
238: }
239:
1.2 jsaarela 240: public void ID (String sID) {
241: m_sID = sID;
1.1 jsaarela 242: }
243:
1.2 jsaarela 244: public String ID () {
245: return m_sID;
1.4 jsaarela 246: }
247:
248: public void bagID (String sBagID) {
249: m_sBagID = sBagID;
250: }
251:
252: public String bagID () {
253: return m_sBagID;
1.1 jsaarela 254: }
255:
256: public void linearize (int indent, PrintStream ps) {
257: for (int x = 0; x < indent; x++) {
258: ps.print (" ");
259: }
260: System.out.println ("Element "+name());
261: Enumeration e = children();
262: while (e.hasMoreElements()) {
263: Element ele = (Element)e.nextElement();
264: ele.linearize (indent + 2, ps);
265: }
1.2 jsaarela 266: }
267:
268: public boolean done () {
269: return m_bDone;
270: }
271:
272: public void done (boolean b) {
273: m_bDone = b;
1.1 jsaarela 274: }
275: }
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