private ExpressionNode parseTerm() throws ParseExpressionException {
ExpressionNode rootNode = null;
scanner.nextSymbol();
while (scanner.isNot()) {
ExpressionNode oldRoot = rootNode;
rootNode = new ExpressionNotNode(oldRoot);
scanner.nextSymbol();
}
if (scanner.isMiIdentifier()) {
if (rootNode != null) {
ExpressionNotNode tmpNode = (ExpressionNotNode) rootNode;
while (tmpNode.getChild() != null) {
tmpNode = (ExpressionNotNode) tmpNode.getChild();
}
tmpNode.setChild(new ExpressionMiNode(scanner.getCurrSymbol()));
} else {
rootNode = new ExpressionMiNode(scanner.getCurrSymbol());
}
} else if (scanner.isFreeText()) {
if (rootNode != null) {
ExpressionNotNode tmpNode = (ExpressionNotNode) rootNode;
while (tmpNode.getChild() != null) {
tmpNode = (ExpressionNotNode) tmpNode.getChild();
}
tmpNode.setChild(parseFreeText());
} else {
rootNode = parseFreeText();
}
} else if (scanner.isLeftPar()) {
if (rootNode != null) {
ExpressionNotNode tmpNode = (ExpressionNotNode) rootNode;
while (tmpNode.getChild() != null) {
tmpNode = (ExpressionNotNode) tmpNode.getChild();
}
tmpNode.setChild(parseExpression());
} else {
rootNode = parseExpression();
}
scanner.nextSymbol();
if (!scanner.isRightPar()) {
throw new ParseExpressionException();
}
} else {
throw new ParseExpressionException();
}
return rootNode;
}
private ExpressionNode parseFreeText() throws ParseExpressionException {
Set<String> ids = miOntologyTree.getIdByName(scanner.getCurrSymbol());
ExpressionNode rootNode = null;
if (ids.size() > 0) {
Object[] idsArr = ids.toArray();
String tmpExpression = (String) idsArr[0];
for (int i = 1; i < idsArr.length; ++i) {
tmpExpression = tmpExpression + " or " + (String) idsArr[i];
}
ExpressionTree tmpTree = new ExpressionTree(tmpExpression, miOntologyTree, false);
rootNode = tmpTree.getRootNode();
} else {
// TODO FIXME if I give a tag that doesn't have an MI identifier, we return all services.
// TODO collect these non matching terms and print a warning message on the resulting HTML
// page.
rootNode = new ExpressionTrueNode();
}
return rootNode;
}
private ExpressionNode parseExpression() throws ParseExpressionException {
ExpressionNode rootNode = null;
rootNode = parseTerm();
scanner.nextSymbol();
while (isLogicalOp()) {
if (scanner.isAnd()) {
ExpressionNode oldRootNode = rootNode;
rootNode = new ExpressionAndNode(oldRootNode, parseTerm());
} else if (scanner.isOr()) {
ExpressionNode oldRootNode = rootNode;
rootNode = new ExpressionOrNode(oldRootNode, parseTerm());
} else {
throw new ParseExpressionException();
}
}
return rootNode;
}
private boolean isLogicalOp() {
return (scanner.isAnd() || scanner.isOr());
}