Annotation of java/classes/org/w3c/rdf/Element.java, revision 1.10
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 $
1.10 ! jsaarela 6: * Revision 1.9 1998/12/15 17:00:44 jsaarela
! 7: * New distribution release V1.7 on 15-Dec-98.
! 8: *
1.9 jsaarela 9: * Revision 1.8 1998/10/09 17:26:50 jsaarela
10: * Parser conformance to RDF Model&Syntax dated 19981008
11: *
1.8 jsaarela 12: * Revision 1.7 1998/09/08 15:54:01 jsaarela
13: * Distribution release V1.4 - aboutEachPrefix added, namespace management
14: * improved.
15: *
1.7 jsaarela 16: * Revision 1.6 1998/08/28 10:03:15 jsaarela
17: * Distribution release 1.3 on 28-Aug-98.
18: *
1.6 jsaarela 19: * Revision 1.5 1998/08/12 07:54:55 jsaarela
20: * Namespace management now corresponds with the W3C Working
21: * Draft dated 2-Aug-98.
22: *
1.5 jsaarela 23: * Revision 1.4 1998/07/30 13:39:32 jsaarela
24: * multiple internal references fixed,
25: * properties without children fixed.
26: *
1.4 jsaarela 27: * Revision 1.3 1998/07/27 12:20:54 jsaarela
28: * 1st distribution version logged in.
29: *
1.3 jsaarela 30: *
1.1 jsaarela 31: * @author Janne Saarela
32: */
33: package org.w3c.rdf;
34:
1.10 ! jsaarela 35: import java.net.URL;
1.1 jsaarela 36: import java.util.*;
37: import java.io.*;
38: import org.xml.sax.AttributeList;
1.4 jsaarela 39: import org.xml.sax.SAXException;
1.1 jsaarela 40:
41: public class Element
42: {
1.7 jsaarela 43: private String m_sName = null;
44: private Hashtable m_attributes = new Hashtable();
45: private Vector m_children = new Vector();
1.10 ! jsaarela 46: private String m_sResource = null;
1.7 jsaarela 47: private String m_sID = null;
48: private String m_sBagID = null;
1.10 ! jsaarela 49: private String m_sAbout = null;
! 50: private String m_sAboutEach = null;
! 51: private String m_sAboutEachPrefix = null;
1.7 jsaarela 52: private Vector m_vTargets = new Vector ();
53: private boolean m_bDone = false;
1.9 jsaarela 54: private String m_sPrefix = null;
1.7 jsaarela 55:
56: public Element (String sName, AttributeList al) throws SAXException {
57: m_sName = sName;
58:
59: if (al != null) {
60: int iLength = al.getLength ();
61: if (al == null) {
62: // System.out.println("[Attributes not available]");
63: } else {
64: for (int x = 0; x < iLength; x++) {
65: String aName = al.getName (x);
66: String aValue = al.getValue (x);
67:
68: m_attributes.put (aName, aValue);
69: }
70: }
1.1 jsaarela 71: }
72: }
73:
1.7 jsaarela 74: public String name() {
1.5 jsaarela 75: return m_sName;
1.9 jsaarela 76: }
77:
78: public void prefix (String sPrefix) {
79: m_sPrefix = sPrefix;
80: }
81:
82: public String prefix () {
83: if (m_sPrefix != null)
84: return m_sPrefix + ":";
85: else
86: return "";
1.3 jsaarela 87: }
1.1 jsaarela 88:
1.7 jsaarela 89: public void addChild (Element e) {
90: m_children.addElement (e);
1.1 jsaarela 91: }
92:
1.7 jsaarela 93: public Enumeration children () {
94: return m_children.elements();
1.1 jsaarela 95: }
1.3 jsaarela 96:
1.7 jsaarela 97: public Enumeration attributes () {
98: return m_attributes.keys();
1.3 jsaarela 99: }
100:
1.7 jsaarela 101: public void addAttribute (String sName, String sValue) {
102: if (sName == null ||
103: sValue == null)
104: return;
105: m_attributes.put (sName, sValue);
106: }
1.1 jsaarela 107:
1.7 jsaarela 108: public void removeAttribute (String sName) {
109: m_attributes.remove (sName);
110: }
1.1 jsaarela 111:
1.7 jsaarela 112: public String getAttribute (String sName) {
113: return (String)m_attributes.get (sName);
114: }
1.1 jsaarela 115:
1.7 jsaarela 116: public String getAttribute (String sNamespace, String sName) {
117: return (String)m_attributes.get (sNamespace+sName);
118: }
1.1 jsaarela 119:
1.7 jsaarela 120: public void addTarget (Element e) {
121: m_vTargets.addElement (e);
122: }
1.1 jsaarela 123:
1.7 jsaarela 124: public Enumeration targets () {
125: return m_vTargets.elements();
126: }
1.4 jsaarela 127:
1.7 jsaarela 128: public Element target () {
129: if (m_vTargets.size() == 0)
130: return null;
131: else
132: return (Element)m_vTargets.elementAt(0);
133: }
1.4 jsaarela 134:
1.10 ! jsaarela 135: public void resource (String sResource) {
! 136: m_sResource = sResource;
! 137: }
! 138:
! 139: public void resource (String sResource, String sContext) {
! 140: m_sResource = makeAbsolute (sResource, sContext);
! 141: }
! 142:
! 143: public String resource () {
! 144: return m_sResource;
! 145: }
! 146:
1.7 jsaarela 147: public void ID (String sID) {
148: m_sID = sID;
149: }
150:
1.10 ! jsaarela 151: public void ID (String sID, String sContext) {
! 152: m_sID = makeAbsolute (sID, sContext);
! 153: }
! 154:
1.7 jsaarela 155: public String ID () {
156: return m_sID;
157: }
158:
159: public void bagID (String sBagID) {
160: m_sBagID = sBagID;
161: }
1.1 jsaarela 162:
1.10 ! jsaarela 163:
! 164: public void bagID (String sBagID, String sContext) {
! 165: m_sBagID = makeAbsolute (sBagID, sContext);
! 166: }
! 167:
1.7 jsaarela 168: public String bagID () {
169: return m_sBagID;
1.1 jsaarela 170: }
1.7 jsaarela 171:
1.10 ! jsaarela 172: public void about (String sAbout) {
! 173: m_sAbout = sAbout;
! 174: }
! 175:
! 176: public void about (String sAbout, String sContext) {
! 177: m_sAbout = makeAbsolute (sAbout, sContext);
! 178: }
! 179:
! 180: public String about () {
! 181: return m_sAbout;
! 182: }
! 183:
! 184: public void aboutEach (String sAboutEach) {
! 185: m_sAboutEach = sAboutEach;
! 186: }
! 187:
! 188: public void aboutEach (String sAboutEach, String sContext) {
! 189: m_sAboutEach = makeAbsolute (sAboutEach, sContext);
! 190: }
! 191:
! 192: public String aboutEach () {
! 193: return m_sAboutEach;
! 194: }
! 195:
! 196: public void aboutEachPrefix (String sAboutEachPrefix) {
! 197: m_sAboutEachPrefix = sAboutEachPrefix;
! 198: }
! 199:
! 200: public void aboutEachPrefix (String sAboutEachPrefix, String sContext) {
! 201: m_sAboutEachPrefix = makeAbsolute (sAboutEachPrefix, sContext);
! 202: }
! 203:
! 204: public String aboutEachPrefix () {
! 205: return m_sAboutEachPrefix;
! 206: }
! 207:
1.7 jsaarela 208: public void linearize (int indent, PrintStream ps) {
209: for (int x = 0; x < indent; x++) {
210: ps.print (" ");
211: }
1.8 jsaarela 212: System.out.print ("Element "+name()+" (");
213:
214: Enumeration eKeys = m_attributes.keys ();
215: while (eKeys.hasMoreElements()) {
216: String sName = (String)eKeys.nextElement ();
217: String sValue = (String)m_attributes.get (sName);
218: System.out.print (" "+sName+"="+sValue);
219: }
220: System.out.print (")\n");
221:
1.7 jsaarela 222: Enumeration e = children();
223: while (e.hasMoreElements()) {
224: Element ele = (Element)e.nextElement();
225: ele.linearize (indent + 2, ps);
226: }
1.1 jsaarela 227: }
1.2 jsaarela 228:
1.7 jsaarela 229: public boolean done () {
230: return m_bDone;
231: }
1.2 jsaarela 232:
1.7 jsaarela 233: public void done (boolean b) {
234: m_bDone = b;
1.10 ! jsaarela 235: }
! 236:
! 237: /**
! 238: * Private methods for this class only
! 239: */
! 240:
! 241: private String makeAbsolute (String sURI, String context) {
! 242: String sResult = new String ();
! 243: if (sURI != null &&
! 244: context != null) {
! 245:
! 246: /**
! 247: * If sURI has .. then it indicates relative URI which
! 248: * we must make absolute
! 249: */
! 250: if (sURI.startsWith ("..")) {
! 251: try {
! 252: URL absoluteURL = new URL (new URL(context), sURI);
! 253: sResult = absoluteURL.toString();
! 254: } catch(Exception e) {
! 255: System.err.println("RDF Resource - cannot combine " +
! 256: context + " with " +sURI);
! 257: }
! 258: } else {
! 259: /**
! 260: * If sURI is an absolute URI, don't bother
! 261: * with it
! 262: */
! 263: try {
! 264: URL absoluteURL = new URL (sURI);
! 265: sResult = absoluteURL.toString();
! 266:
! 267: } catch(Exception e) {
! 268: /**
! 269: * Well, the sURI wasn't absolute either,
! 270: * try making absolute with the context
! 271: */
! 272: if (sURI.indexOf ('/') > -1) {
! 273: try {
! 274: URL absoluteURL = new URL (new URL(context), sURI);
! 275: sResult = absoluteURL.toString();
! 276: } catch (Exception e2) {
! 277: sResult = context + "#" + sURI;
! 278: }
! 279: } else {
! 280: sResult = context + "#" + sURI;
! 281: }
! 282: }
! 283: }
! 284: return sResult;
! 285: } else {
! 286: return sURI;
! 287: }
1.7 jsaarela 288: }
1.1 jsaarela 289: }
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