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ContentModel.javaAPI DocJava SE 5 API5150Fri Aug 26 14:58:20 BST 2005javax.swing.text.html.parser

ContentModel

public final class ContentModel extends Object implements Serializable
A representation of a content model. A content model is basically a restricted BNF expression. It is restricted in the sense that it must be deterministic. This means that you don't have to represent it as a finite state automata.

See Annex H on page 556 of the SGML handbook for more information.

author
Arthur van Hoff
version
1.11,05/05/04

Fields Summary
public int
type
Type. Either '*', '?', '+', ',', '|', '&'.
public Object
content
The content. Either an Element or a ContentModel.
public ContentModel
next
The next content model (in a ',', '|' or '&' expression).
private boolean[]
valSet
private boolean[]
val
Constructors Summary
public ContentModel()
public ContentModel(Element content)
Create a content model for an element.

	this(0, content, null);
public ContentModel(int type, ContentModel content)
Create a content model of a particular type.

	this(type, content, null);
public ContentModel(int type, Object content, ContentModel next)
Create a content model of a particular type.

	this.type = type;
	this.content = content;
	this.next = next;
Methods Summary
public booleanempty()
Return true if the content model could match an empty input stream.

	switch (type) {
	  case '*":
	  case '?":
	    return true;

	  case '+":
	  case '|":
	    for (ContentModel m = (ContentModel)content ; m != null ; m = m.next) {
		if (m.empty()) {
		    return true;
		}
	    }
	    return false;

	  case ',":
	  case '&":
	    for (ContentModel m = (ContentModel)content ; m != null ; m = m.next) {
		if (!m.empty()) {
		    return false;
		}
	    }
	    return true;

	  default:
	    return false;
	}
public booleanfirst(java.lang.Object token)
Return true if the token could potentially be the first token in the input stream.

	switch (type) {
	  case '*":
	  case '?":
	  case '+":
	    return ((ContentModel)content).first(token);

	  case ',":
	    for (ContentModel m = (ContentModel)content ; m != null ; m = m.next) {
		if (m.first(token)) {
		    return true;
		}
		if (!m.empty()) {
		    return false;
		}
	    }
	    return false;

	  case '|":
	  case '&": {
	    Element e = (Element) token;
	    if (valSet == null) {
		valSet = new boolean[Element.maxIndex + 1];
		val = new boolean[Element.maxIndex + 1];
		// All Element instances are created before this ever executes
	    }
	    if (valSet[e.index]) {
		return val[e.index];
	    }
	    for (ContentModel m = (ContentModel)content ; m != null ; m = m.next) {
		if (m.first(token)) {
		    val[e.index] = true;
		    break;
		}
	    }
	    valSet[e.index] = true;
	    return val[e.index];
	  }

	  default:
	    return (content == token);
            // PENDING: refer to comment in ContentModelState
/*
              if (content == token) {
                  return true;
              }
              Element e = (Element)content;
              if (e.omitStart() && e.content != null) {
                  return e.content.first(token);
              }
              return false;
*/
	}
public javax.swing.text.html.parser.Elementfirst()
Return the element that must be next.

	switch (type) {
	  case '&":
	  case '|":
	  case '*":
	  case '?":
	    return null;

	  case '+":
	  case ',":
	    return ((ContentModel)content).first();

	  default:
	    return (Element)content;
	}
public voidgetElements(java.util.Vector elemVec)
Update elemVec with the list of elements that are part of the this contentModel.

	 switch (type) {
	 case '*":
	 case '?":
	 case '+":
	     ((ContentModel)content).getElements(elemVec);
	     break;
	 case ',":
	 case '|":
	 case '&":
	     for (ContentModel m=(ContentModel)content; m != null; m=m.next){
		 m.getElements(elemVec);
	     }
	     break;
	 default:
	     elemVec.addElement((Element)content);
	 }
public java.lang.StringtoString()
Convert to a string.

	switch (type) {
	  case '*":
	    return content + "*";
	  case '?":
	    return content + "?";
	  case '+":
	    return content + "+";

	  case ',":
	  case '|":
	  case '&":
	    char data[] = {' ", (char)type, ' "};
	    String str = "";
	    for (ContentModel m = (ContentModel)content ; m != null ; m = m.next) {
		str = str + m;
		if (m.next != null) {
		    str += new String(data);
		}
	    }
	    return "(" + str + ")";

	  default:
	    return content.toString();
	}