original

[gb-231r1-is01/GB_2.3_IS01.git] / cts / tools / signature-tools / src / signature / compare / model / subst / ViewpointAdapter.java

diff --git a/cts/tools/signature-tools/src/signature/compare/model/subst/ViewpointAdapter.java b/cts/tools/signature-tools/src/signature/compare/model/subst/ViewpointAdapter.java
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+++ b/cts/tools/signature-tools/src/signature/compare/model/subst/ViewpointAdapter.java
@@ -0,0 +1,111 @@
+/*
+ * Copyright (C) 2009 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package signature.compare.model.subst;
+
+import signature.model.IArrayType;
+import signature.model.IClassDefinition;
+import signature.model.IClassReference;
+import signature.model.IParameterizedType;
+import signature.model.IPrimitiveType;
+import signature.model.ITypeReference;
+import signature.model.ITypeVariableDefinition;
+import signature.model.ITypeVariableReference;
+import signature.model.IWildcardType;
+import signature.model.impl.SigClassReference;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+public class ViewpointAdapter {
+
+    static Map<ITypeVariableDefinition, ITypeReference> createTypeMapping(
+            IParameterizedType paramameterizedType,
+            IClassDefinition parameterizedTypeDefinition) {
+        List<ITypeVariableDefinition> typeParameters =
+                parameterizedTypeDefinition.getTypeParameters();
+        List<ITypeReference> actualTypeArguments = paramameterizedType
+                .getTypeArguments();
+        if (actualTypeArguments == null || typeParameters == null) {
+            return Collections.emptyMap();
+        }
+        Map<ITypeVariableDefinition, ITypeReference> substitution =
+                new HashMap<ITypeVariableDefinition, ITypeReference>();
+        Iterator<ITypeVariableDefinition> paramsIterator = typeParameters
+                .iterator();
+        Iterator<ITypeReference> argumentsIterator = actualTypeArguments
+                .iterator();
+        while (paramsIterator.hasNext() && argumentsIterator.hasNext()) {
+            substitution.put(paramsIterator.next(), argumentsIterator.next());
+        }
+        return substitution;
+    }
+
+    public static Set<ITypeReference> substitutedTypeReferences(
+            Set<ITypeReference> original,
+            Map<ITypeVariableDefinition, ITypeReference> mappings) {
+        List<ITypeReference> result = new ArrayList<ITypeReference>(original);
+        return new HashSet<ITypeReference>(substitutedTypeReferences(result,
+                mappings));
+    }
+
+    public static List<ITypeReference> substitutedTypeReferences(
+            List<ITypeReference> original,
+            Map<ITypeVariableDefinition, ITypeReference> mappings) {
+        List<ITypeReference> result = new ArrayList<ITypeReference>(original
+                .size());
+        for (ITypeReference typeReference : original) {
+            result.add(substitutedTypeReference(typeReference, mappings));
+        }
+        return result;
+    }
+
+    public static ITypeReference substitutedTypeReference(
+            ITypeReference original,
+            Map<ITypeVariableDefinition, ITypeReference> mappings) {
+        ITypeReference type = original;
+        if (type instanceof IClassReference) {
+            return new ClassReferenceProjection((IClassReference) original,
+                    mappings);
+        } else if (type instanceof IPrimitiveType) {
+            return type;
+        } else if (type instanceof IArrayType) {
+            return new ArrayTypeProjection((IArrayType) type, mappings);
+        } else if (type instanceof IParameterizedType) {
+            return new ParameterizedTypeProjection((IParameterizedType) type,
+                    mappings);
+        } else if (type instanceof IWildcardType) {
+            return new WildcardTypeProjection((IWildcardType) type, mappings);
+        } else if (type instanceof ITypeVariableReference) {
+            // here happens the substitution
+            ITypeReference subst = mappings.get(((ITypeVariableReference) type)
+                    .getTypeVariableDefinition());
+            return subst != null ? subst : type;
+        }
+        throw new IllegalStateException();
+    }
+
+    public static IClassReference getReferenceTo(IClassDefinition definition) {
+        return new SigClassReference(new ClassProjection(definition,
+                new HashMap<ITypeVariableDefinition, ITypeReference>()));
+    }
+}