1 files changed, 110 insertions, 0 deletions
diff --git a/dx/src/com/android/dx/rop/cst/CstKnownNull.java b/dx/src/com/android/dx/rop/cst/CstKnownNull.java
new file mode 100644
index 0000000..a80322c
--- /dev/null
+++ b/dx/src/com/android/dx/rop/cst/CstKnownNull.java
@@ -0,0 +1,110 @@
+/*
+ * Copyright (C) 2007 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 com.android.dx.rop.cst;
+
+import com.android.dx.rop.type.Type;
+
+/**
+ * Constant type to represent a known-{@code null} value.
+ */
+public final class CstKnownNull extends CstLiteralBits {
+    /** {@code non-null;} unique instance of this class */
+    public static final CstKnownNull THE_ONE = new CstKnownNull();
+
+    /**
+     * Constructs an instance. This class is not publicly instantiable. Use
+     * {@link #THE_ONE}.
+     */
+    private CstKnownNull() {
+        // This space intentionally left blank.
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public boolean equals(Object other) {
+        return (other instanceof CstKnownNull);
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public int hashCode() {
+        return 0x4466757a;
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    protected int compareTo0(Constant other) {
+        return 0;
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public String toString() {
+        return "known-null";
+    }
+
+    /** {@inheritDoc} */
+    public Type getType() {
+        return Type.KNOWN_NULL;
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public String typeName() {
+        return "known-null";
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public boolean isCategory2() {
+        return false;
+    }
+
+    /** {@inheritDoc} */
+    public String toHuman() {
+        return "null";
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public boolean fitsInInt() {
+        // See comment in getIntBits().
+        return true;
+    }
+
+    /**
+     * {@inheritDoc}
+     *
+     * As "literal bits," a known-null is always represented as the
+     * number zero.
+     */
+    @Override
+    public int getIntBits() {
+        return 0;
+    }
+
+    /**
+     * {@inheritDoc}
+     *
+     * As "literal bits," a known-null is always represented as the
+     * number zero.
+     */
+    @Override
+    public long getLongBits() {
+        return 0;
+    }
+}