78 lines
2.3 KiB
Java
78 lines
2.3 KiB
Java
package org.gcube.informationsystem.resourceregistry.queries.operators;
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import java.util.HashMap;
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import java.util.HashSet;
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import java.util.Map;
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import java.util.Set;
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/**
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* @author Luca Frosini (ISTI - CNR)
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*
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* OrientDB supports the eval() function to execute complex operations. Example:
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*
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* SELECT eval( "amount * 120 / 100 - discount" ) as finalPrice from Order
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*
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* See https://www.orientdb.com/docs/3.0.x/sql/SQL-Where.html#mathematics-operators
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* https://www.orientdb.com/docs/3.0.x/sql/SQL-Syntax.html#math-operators
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* https://www.orientdb.com/docs/3.0.x/sql/SQL-Syntax.html#math-operators-precedence
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* https://www.orientdb.com/docs/3.0.x/sql/SQL-Syntax.html#array-concatenation
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*/
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public enum MatemathicsOperator {
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SUM("_sum", " + ", ""),
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MINUS("_minus", " - ", ""),
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MULTIPLY("_multiply", " * ", ""),
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DIVIDE("_divide", " / ", ""),
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MODULE("_mod", " % ", ""),
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BITWISE_RIGHT_SHIFT("_bitrshift", " >> ", ""),
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BITWISE_LEFT_SHIFT("_bitlshift", " << ", ""),
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BITWISE_AND("_bitand", " & ", ""),
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BITWISE_OR("_bitor", " | ", ""),
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BITWISE_XOR("_bitxor", " ^ ", ""),
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ARRAY_CONCATENATION("_arrayconcat", " || ", "");
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protected final String operator;
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protected final String matemathicsOperator;
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protected final String description;
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private MatemathicsOperator(String operator, String matemathicsOperator, String description) {
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this.operator = operator;
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this.matemathicsOperator = matemathicsOperator;
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this.description = description;
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}
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public String getOperator() {
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return operator;
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}
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public String getMatemathicsOperator() {
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return matemathicsOperator;
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}
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public String getDescription() {
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return description;
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}
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private static Set<String> operators;
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private static Map<String,MatemathicsOperator> operatorByKey;
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static {
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MatemathicsOperator.operators = new HashSet<>();
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MatemathicsOperator.operatorByKey = new HashMap<>();
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for(MatemathicsOperator queryLogicalOperator : MatemathicsOperator.values()) {
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MatemathicsOperator.operators.add(queryLogicalOperator.getOperator());
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MatemathicsOperator.operatorByKey.put(queryLogicalOperator.getOperator(), queryLogicalOperator);
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}
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}
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public static Set<String> getOperators() {
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return MatemathicsOperator.operators;
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}
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public static MatemathicsOperator getQueryLogicalOperator(String key) {
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return operatorByKey.get(key);
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}
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}
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