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tasks/astrid/common-src/com/todoroo/andlib/sql/Operator.java

58 lines
2.0 KiB
Java

package com.todoroo.andlib.sql;
import static com.todoroo.andlib.sql.SqlConstants.SPACE;
import java.util.HashMap;
import java.util.Map;
@SuppressWarnings("nls")
public final class Operator {
private final String operator;
public static final Operator eq = new Operator("=");
public static final Operator neq = new Operator("<>");
public static final Operator isNull = new Operator("IS NULL");
public static final Operator isNotNull = new Operator("IS NOT NULL");
public static final Operator gt = new Operator(">");
public static final Operator lt = new Operator("<");
public static final Operator gte = new Operator(">=");
public static final Operator lte = new Operator("<=");
public static final Operator and = new Operator("AND");
public static final Operator or = new Operator("OR");
public static final Operator not = new Operator("NOT");
public static final Operator exists = new Operator("EXISTS");
public static final Operator like = new Operator("LIKE");
public static final Operator in = new Operator("IN");
private static final Map<Operator, Operator> contraryRegistry = new HashMap<Operator, Operator>();
static {
contraryRegistry.put(eq, neq);
contraryRegistry.put(neq, eq);
contraryRegistry.put(isNull, isNotNull);
contraryRegistry.put(isNotNull, isNull);
contraryRegistry.put(gt, lte);
contraryRegistry.put(lte, gt);
contraryRegistry.put(lt, gte);
contraryRegistry.put(gte, lt);
}
private Operator(String operator) {
this.operator = operator;
}
public Operator getContrary() {
if(!contraryRegistry.containsKey(this)){
Operator opposite = new Operator(not.toString() + SPACE + this.toString());
contraryRegistry.put(this, opposite);
contraryRegistry.put(opposite, this);
}
return contraryRegistry.get(this);
}
@Override
public String toString() {
return this.operator.toString();
}
}