1 files changed, 44 insertions, 0 deletions

diff --git a/subprojects/viatra-runtime/src/main/java/tools/refinery/viatra/runtime/matchers/aggregators/max.java b/subprojects/viatra-runtime/src/main/java/tools/refinery/viatra/runtime/matchers/aggregators/max.java
new file mode 100644
index 00000000..e0236223
--- /dev/null
+++ b/subprojects/viatra-runtime/src/main/java/tools/refinery/viatra/runtime/matchers/aggregators/max.java
@@ -0,0 +1,44 @@
+/*******************************************************************************
+ * Copyright (c) 2010-2016, Gabor Bergmann, IncQueryLabs Ltd.
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v. 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-v20.html.
+ * 
+ * SPDX-License-Identifier: EPL-2.0
+ *******************************************************************************/
+package tools.refinery.viatra.runtime.matchers.aggregators;
+
+import java.math.BigDecimal;
+import java.math.BigInteger;
+import java.util.Calendar;
+import java.util.Date;
+
+import tools.refinery.viatra.runtime.matchers.psystem.aggregations.AggregatorType;
+import tools.refinery.viatra.runtime.matchers.psystem.aggregations.BoundAggregator;
+import tools.refinery.viatra.runtime.matchers.psystem.aggregations.IAggregatorFactory;
+
+/**
+ * This aggregator calculates the maximum value of a selected aggregate parameter of a called pattern. The aggregate
+ * parameter is selected with the '#' symbol; the aggregate parameter must not be used outside the aggregator call. The
+ * other parameters of the call might be bound or unbound; bound parameters limit the matches to consider for the
+ * minimum calculation.
+ * 
+ * @since 1.4
+ * @author Gabor Bergmann
+ */
+@AggregatorType(
+        // TODO T extends Comparable?
+        parameterTypes = {BigDecimal.class, BigInteger.class, Boolean.class, Byte.class, Calendar.class, Character.class, 
+                Date.class, Double.class, Enum.class, Float.class, Integer.class, Long.class, Short.class, String.class},
+        returnTypes = {BigDecimal.class, BigInteger.class, Boolean.class, Byte.class, Calendar.class, Character.class, 
+                Date.class, Double.class, Enum.class, Float.class, Integer.class, Long.class, Short.class, String.class})
+public final class max implements IAggregatorFactory {
+
+    @Override
+    public BoundAggregator getAggregatorLogic(Class<?> domainClass) {
+        if (Comparable.class.isAssignableFrom(domainClass))
+            return new BoundAggregator(ExtremumOperator.getMax(), domainClass, domainClass);
+        else throw new IllegalArgumentException();
+    }
+
+}