62 lines
1.5 KiB
Java
62 lines
1.5 KiB
Java
package eu.dnetlib.functionality.cql;
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import java.util.Set;
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import org.apache.commons.lang3.StringUtils;
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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.CQLOrNode;
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import org.z3950.zing.cql.CQLParser;
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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 CQLExpander {
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private static final String OP = "or";
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private static final String _OP_ = " " + OP + " ";
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public CQLNode expand(CQLNode node, Set<String> fields) {
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return doExpand(node, fields);
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}
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private static CQLNode doExpand(CQLNode node, Set<String> fields) {
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if (node instanceof CQLBooleanNode) {
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return doExpand((CQLBooleanNode) node, fields);
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}
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if (node instanceof CQLTermNode) {
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return doExpand((CQLTermNode) node, fields);
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}
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// if (node == null)
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// return terms;
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throw new RuntimeException("error choice");
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}
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private static CQLNode doExpand(CQLBooleanNode node, Set<String> fields) {
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CQLNode left = doExpand(node.left, fields);
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CQLNode right = doExpand(node.right, fields);
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return new CQLOrNode(left, right, new ModifierSet("or"));
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}
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private static CQLNode doExpand(CQLTermNode node, Set<String> fields) {
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String expand = "";
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for (String field : fields) {
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expand += field + "=" + node.getTerm() + _OP_;
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}
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expand = StringUtils.removeEnd(expand, _OP_);
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try {
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return new CQLParser().parse(expand);
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} catch (Exception e) {
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throw new RuntimeException("unable to parse: " + expand);
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}
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}
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}
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