Cleaned up Java Binding code from YANG Tools

[mdsal.git] / binding / mdsal-binding-dom-codec / src / main / java / org / opendaylight / yangtools / binding / data / codec / impl / UnionValueOptionContext.java

diff --git a/binding/mdsal-binding-dom-codec/src/main/java/org/opendaylight/yangtools/binding/data/codec/impl/UnionValueOptionContext.java b/binding/mdsal-binding-dom-codec/src/main/java/org/opendaylight/yangtools/binding/data/codec/impl/UnionValueOptionContext.java
new file mode 100644 (file)
index 0000000..7c4c144
--- /dev/null
+++ b/binding/mdsal-binding-dom-codec/src/main/java/org/opendaylight/yangtools/binding/data/codec/impl/UnionValueOptionContext.java
@@ -0,0 +1,72 @@
+/*
+ * Copyright (c) 2014 Cisco Systems, Inc. and others.  All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v1.0 which accompanies this distribution,
+ * and is available at http://www.eclipse.org/legal/epl-v10.html
+ */
+package org.opendaylight.yangtools.binding.data.codec.impl;
+
+import com.google.common.base.Preconditions;
+import com.google.common.base.Throwables;
+import java.lang.invoke.MethodHandle;
+import java.lang.invoke.MethodHandles;
+import java.lang.invoke.MethodHandles.Lookup;
+import java.lang.invoke.MethodType;
+import java.lang.reflect.Method;
+import org.opendaylight.yangtools.concepts.Codec;
+
+final class UnionValueOptionContext {
+    private static final Lookup LOOKUP = MethodHandles.publicLookup();
+    private static final MethodType OBJECT_TYPE = MethodType.methodType(Object.class, Object.class);
+    private final Class<?> bindingType;
+    // FIXME: migrate to invocation
+    private final MethodHandle getter;
+    private final Codec<Object,Object> codec;
+
+    UnionValueOptionContext(final Class<?> valueType, final Method getter, final Codec<Object, Object> codec) {
+        this.bindingType = Preconditions.checkNotNull(valueType);
+        this.codec = Preconditions.checkNotNull(codec);
+
+        try {
+            this.getter = LOOKUP.unreflect(getter).asType(OBJECT_TYPE);
+        } catch (IllegalAccessException e) {
+            throw new IllegalStateException("Failed to access method " + getter, e);
+        }
+    }
+
+    Object serialize(final Object input) {
+        final Object baValue = getValueFrom(input);
+        if (baValue == null) {
+            return null;
+        }
+
+        return codec.serialize(baValue);
+    }
+
+    Object getValueFrom(final Object input) {
+        try {
+            return getter.invokeExact(input);
+        } catch (Throwable e) {
+            throw Throwables.propagate(e);
+        }
+    }
+
+    @Override
+    public int hashCode() {
+        return bindingType.hashCode();
+    }
+
+    @Override
+    public boolean equals(final Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (!(obj instanceof UnionValueOptionContext)) {
+            return false;
+        }
+
+        final UnionValueOptionContext other = (UnionValueOptionContext) obj;
+        return bindingType.equals(other.bindingType);
+    }
+}
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