1 files changed, 81 insertions, 0 deletions
diff --git a/dx/src/com/android/dx/dex/file/IndexedItem.java b/dx/src/com/android/dx/dex/file/IndexedItem.java
new file mode 100644
index 0000000..9ba4783
--- /dev/null
+++ b/dx/src/com/android/dx/dex/file/IndexedItem.java
@@ -0,0 +1,81 @@
+/*
+ * 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.dex.file;
+
+/**
+ * An item in a Dalvik file which is referenced by index.
+ */
+public abstract class IndexedItem extends Item {
+    /** {@code >= -1;} assigned index of the item, or {@code -1} if not
+     * yet assigned */
+    private int index;
+
+    /**
+     * Constructs an instance. The index is initially unassigned.
+     */
+    public IndexedItem() {
+        index = -1;
+    }
+
+    /**
+     * Gets whether or not this instance has been assigned an index.
+     *
+     * @return {@code true} iff this instance has been assigned an index
+     */
+    public final boolean hasIndex() {
+        return (index >= 0);
+    }
+
+    /**
+     * Gets the item index.
+     *
+     * @return {@code >= 0;} the index
+     * @throws RuntimeException thrown if the item index is not yet assigned
+     */
+    public final int getIndex() {
+        if (index < 0) {
+            throw new RuntimeException("index not yet set");
+        }
+
+        return index;
+    }
+
+    /**
+     * Sets the item index. This method may only ever be called once
+     * per instance, and this will throw a {@code RuntimeException} if
+     * called a second (or subsequent) time.
+     *
+     * @param index {@code >= 0;} the item index
+     */
+    public final void setIndex(int index) {
+        if (this.index != -1) {
+            throw new RuntimeException("index already set");
+        }
+
+        this.index = index;
+    }
+
+    /**
+     * Gets the index of this item as a string, suitable for including in
+     * annotations.
+     *
+     * @return {@code non-null;} the index string
+     */
+    public final String indexString() {
+        return '[' + Integer.toHexString(index) + ']';
+    }
+}