X-Git-Url: https://gerrit.simantics.org/r/gitweb?a=blobdiff_plain;f=bundles%2Forg.simantics.scl.commands%2Fsrc%2Forg%2Fsimantics%2Fscl%2Fcommands%2Finternal%2Fchecker%2FChecker.java;fp=bundles%2Forg.simantics.scl.commands%2Fsrc%2Forg%2Fsimantics%2Fscl%2Fcommands%2Finternal%2Fchecker%2FChecker.java;h=7003431760b40a0bbe6b074b550246c9686665a5;hb=969bd23cab98a79ca9101af33334000879fb60c5;hp=0000000000000000000000000000000000000000;hpb=866dba5cd5a3929bbeae85991796acb212338a08;p=simantics%2Fplatform.git

diff --git a/bundles/org.simantics.scl.commands/src/org/simantics/scl/commands/internal/checker/Checker.java b/bundles/org.simantics.scl.commands/src/org/simantics/scl/commands/internal/checker/Checker.java
new file mode 100644
index 000000000..700343176
--- /dev/null
+++ b/bundles/org.simantics.scl.commands/src/org/simantics/scl/commands/internal/checker/Checker.java
@@ -0,0 +1,60 @@
+package org.simantics.scl.commands.internal.checker;
+
+import java.util.Map;
+
+import org.simantics.scl.compiler.elaboration.modules.SCLValue;
+import org.simantics.scl.compiler.top.ValueNotFound;
+import org.simantics.scl.compiler.types.Type;
+import org.simantics.scl.compiler.types.Types;
+import org.simantics.scl.compiler.types.exceptions.MatchException;
+import org.simantics.scl.compiler.types.util.MultiFunction;
+import org.simantics.scl.osgi.SCLOsgi;
+
+/**
+ * Checks given parameters
+ * 
+ * @author Hannu Niemistö
+ */
+public class Checker {
+    Object check;
+    CheckItem item;
+    
+    private Checker(Object check, CheckItem item) {
+        this.check = check;
+        this.item = item;
+    }
+    
+    public boolean check(Object[] parameters) {
+        return item.check(check, parameters, 0);
+    }
+
+    private static CheckItem checkItemForType(Type type) throws MatchException {
+        if(type == Types.BOOLEAN)
+            return BooleanCheckItem.INSTANCE;
+        if(Types.isFunction(type)) {
+            MultiFunction mfun = Types.matchFunction(type, 1);
+            return new FunctionCheckItem(mfun.parameterTypes[0], checkItemForType(mfun.returnType));
+        }
+        else if(Types.isApply(Types.MAYBE, 1, type)) {
+            Type componentType = Types.matchApply(Types.MAYBE, type);
+            return new MaybeCheckItem(checkItemForType(componentType));
+        }
+        else
+            throw new MatchException();
+    }
+    
+    public static Checker create(String name) {
+        try {
+            SCLValue checkRef = SCLOsgi.MODULE_REPOSITORY.getValueRef(name);
+            Object check = SCLOsgi.MODULE_REPOSITORY.getValue(name);
+            return new Checker(check, checkItemForType(checkRef.getType()));
+        } catch(ValueNotFound e) {
+            // If we don't find a check, it always succeeds
+            return new Checker(Boolean.TRUE, BooleanCheckItem.INSTANCE);
+        } catch (MatchException e) {
+            // Should not happens
+            e.printStackTrace();
+            return new Checker(Boolean.FALSE, BooleanCheckItem.INSTANCE);
+        }
+    }
+}