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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.model.content.cluster;
import com.yahoo.document.select.DocumentSelector;
import com.yahoo.document.select.parser.ParseException;
import com.yahoo.document.select.rule.DocumentNode;
import com.yahoo.document.select.rule.DocumentTypeNode;
import com.yahoo.vespa.model.content.DocumentTypeVisitor;
import com.yahoo.vespa.model.builder.xml.dom.ModelElement;
/**
* @author thomasg
*/
public class DocumentSelectionBuilder {
private static class AllowedDocumentTypesChecker extends DocumentTypeVisitor {
String allowedType;
private AllowedDocumentTypesChecker(String allowedType) {
this.allowedType = allowedType;
}
@Override
public void visit(DocumentNode documentNode) {
validateType(documentNode.getType());
}
@Override
public void visit(DocumentTypeNode documentTypeNode) {
validateType(documentTypeNode.getType());
}
private void validateType(String type) {
if (!type.equals(this.allowedType)) {
if (this.allowedType == null) {
throw new IllegalArgumentException("Document type references are not allowed " +
"in global <documents> tag selection attribute " +
"(found reference to type '" + type + "')");
} else {
throw new IllegalArgumentException("Selection for document type '" + this.allowedType +
"' can not contain references to other document types " +
"(found reference to type '" + type + "')");
}
}
}
}
private void validateSelectionExpression(String selectionString, String allowedType) {
DocumentSelector s;
try {
s = new DocumentSelector(selectionString);
} catch (ParseException e) {
throw new IllegalArgumentException("Could not parse document routing selection: " + selectionString, e);
}
AllowedDocumentTypesChecker checker = new AllowedDocumentTypesChecker(allowedType);
s.visit(checker);
}
public String build(ModelElement elem) {
StringBuilder sb = new StringBuilder();
if (elem != null) {
for (ModelElement e : elem.subElements("document")) {
if (sb.length() > 0) {
sb.append(" OR ");
}
sb.append('(');
String type = e.stringAttribute("type");
sb.append(type);
String selection = e.stringAttribute("selection");
if (selection != null) {
validateSelectionExpression(selection, type);
sb.append(" AND (");
sb.append(selection);
sb.append(')');
}
sb.append(')');
}
String globalSelection = elem.stringAttribute("selection");
if (globalSelection != null) {
validateSelectionExpression(globalSelection, null);
return "(" + globalSelection + ") AND (" + sb + ")";
}
}
return sb.toString();
}
}
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