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package eu.dnetlib.utils.cql;
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import java.util.ArrayList;
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import java.util.List;
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/**
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* @author stoumpos
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*
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*/
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public class CqlQuery {
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CqlClause root = null;
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CqlQuery() {
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this(null);
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}
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CqlQuery(CqlClause root) {
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this.root = root;
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}
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public CqlClause getRoot() {
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return root;
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}
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public void setRoot(CqlClause root) {
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this.root = root;
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}
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@Override
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public String toString() {
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return (root == null) ? "null" : root.toCqlString();
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}
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/**
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* Return <code>true</code> if this query is a superset of
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* <code>query</code>, otherwise <code>false</code>.
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*/
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public boolean contains(CqlQuery query) {
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return contains(root, query.getRoot());
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}
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private boolean contains(CqlClause big, CqlClause small) {
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if (big.type == CqlClause.CqlClauseType.BOOLEAN && small.type == CqlClause.CqlClauseType.BOOLEAN) {
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return containsBooleans((CqlBoolean) big, (CqlBoolean) small);
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} else if (big.type == CqlClause.CqlClauseType.BOOLEAN) {
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// small is either term or relation
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return containsBooleanTerm((CqlBoolean) big, small);
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} else if (small.type == CqlClause.CqlClauseType.BOOLEAN) {
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// big is either term or relation
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return containsTermBoolean(big, (CqlBoolean) small);
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} else if (big.type == CqlClause.CqlClauseType.RELATION && small.type == CqlClause.CqlClauseType.RELATION) {
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CqlRelation bigRelation = (CqlRelation) big;
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CqlRelation smallRelation = (CqlRelation) small;
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return bigRelation.index.equals(smallRelation.index)
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&& bigRelation.operator.equals(smallRelation.operator)
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&& bigRelation.value.equals(smallRelation.value);
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} else if (big.type == CqlClause.CqlClauseType.TERM && small.type == CqlClause.CqlClauseType.TERM) {
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return ((CqlTerm) big).term.equals(((CqlTerm) small).term);
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}
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return false;
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}
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private boolean containsBooleans(CqlBoolean a, CqlBoolean b) {
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if (a.getOperator().equalsIgnoreCase(b.getOperator())) {
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ArrayList<CqlClause> aList = unfold(a);
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ArrayList<CqlClause> bList = unfold(b);
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if (a.operator.equalsIgnoreCase("and")) {
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return subset(aList, bList);
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} else if (a.operator.equalsIgnoreCase("or")) {
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return superset(bList, aList);
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} else {
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throw new IllegalArgumentException(
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"Unsupported operator: " + a.operator);
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}
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} else {
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return contains(a, b.getLeft()) && contains(a, b.getRight());
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}
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}
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public ArrayList<CqlClause> unfold(CqlBoolean bool) {
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String op = bool.operator;
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ArrayList<CqlClause> siblings = new ArrayList<CqlClause>();
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if (bool.left.type == CqlClause.CqlClauseType.BOOLEAN
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&& ((CqlBoolean) bool.left).operator.equalsIgnoreCase(op)) {
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siblings.addAll(unfold((CqlBoolean) bool.left));
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} else {
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siblings.add(bool.left);
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}
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if (bool.right.type == CqlClause.CqlClauseType.BOOLEAN
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&& ((CqlBoolean) bool.right).operator.equalsIgnoreCase(op)) {
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siblings.addAll(unfold((CqlBoolean) bool.right));
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} else {
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siblings.add(bool.right);
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}
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return siblings;
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}
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private boolean superset(List<CqlClause> superset, List<CqlClause> subset) {
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if (subset.size() > superset.size()) {
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return false;
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}
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for (CqlClause sub : subset) {
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boolean found = false;
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for (CqlClause sup : superset) {
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if (contains(sup, sub)) {
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found = true;
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break;
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}
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}
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if (!found) {
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return false;
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}
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}
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return true;
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}
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private boolean subset(List<CqlClause> subset, List<CqlClause> superset) {
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if (subset.size() > superset.size()) {
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return false;
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}
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for (CqlClause sub : subset) {
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boolean found = false;
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for (CqlClause sup : superset) {
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if (contains(sub, sup)) {
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found = true;
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break;
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}
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}
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if (!found) {
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return false;
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}
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}
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return true;
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}
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private boolean containsBooleanTerm(CqlBoolean bool, CqlClause clause) {
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if (bool.getOperator().equalsIgnoreCase("and")) {
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// warn: assume clause is either term or relation
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return false;
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}
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return contains(bool.getLeft(), clause)
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|| contains(bool.getRight(), clause);
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}
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private boolean containsTermBoolean(CqlClause clause, CqlBoolean bool) {
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if (bool.getOperator().equalsIgnoreCase("or")) {
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// warn: assume clause is either term or relation
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return false;
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}
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return contains(clause, bool.getLeft())
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|| contains(clause, bool.getRight());
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}
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}
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