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package eu.dnetlib.functionality.cql;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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import org.z3950.zing.cql.CQLAndNode;
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import org.z3950.zing.cql.CQLBooleanNode;
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import org.z3950.zing.cql.CQLNode;
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import org.z3950.zing.cql.CQLPrefixNode;
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import org.z3950.zing.cql.CQLTermNode;
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import org.z3950.zing.cql.ModifierSet;
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public class CqlGroup {
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public static final String defaultTerm = "cql.filtered";
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public Map<String, CQLNode> group(final CQLNode node, final List<String> fields) {
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return node != null ? doGroup(node, fields, new HashMap<String, CQLNode>()) : new HashMap<String, CQLNode>();
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}
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private Map<String, CQLNode> doGroup(CQLNode node, List<String> fields, Map<String, CQLNode> groups) {
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if (node instanceof CQLBooleanNode) {
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return doGroup((CQLBooleanNode) node, fields, groups);
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}
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if (node instanceof CQLTermNode) {
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return doGroup((CQLTermNode) node, fields, groups);
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}
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if (node instanceof CQLPrefixNode) {
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return groups;
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}
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throw new RuntimeException("error choice");
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}
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private Map<String, CQLNode> doGroup(CQLBooleanNode node, List<String> fields, Map<String, CQLNode> groups) {
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doGroup(node.left, fields, groups);
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doGroup(node.right, fields, groups);
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return groups;
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}
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private static Map<String, CQLNode> doGroup(CQLTermNode node, List<String> fields, Map<String, CQLNode> groups) {
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if (isTermNodeToGroup(node, fields)) {
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String term = node.getIndex().toLowerCase();
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if (groups.get(term) == null) {
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groups.put(term, node);
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}
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CQLNode group = groups.get(term);
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CQLAndNode andNode = new CQLAndNode(group, node, new ModifierSet("and"));
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if (!groups.containsValue(node)) {
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groups.put(term, andNode);
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}
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}
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return groups;
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}
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private static boolean isTermNodeToGroup(CQLTermNode node, List<String> fields) {
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return fields.contains(node.getIndex().toLowerCase());
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}
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}
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