1 files changed, 143 insertions, 0 deletions
diff --git a/dx/src/com/android/dx/rop/code/LocalItem.java b/dx/src/com/android/dx/rop/code/LocalItem.java
new file mode 100644
index 0000000..d238f21
--- /dev/null
+++ b/dx/src/com/android/dx/rop/code/LocalItem.java
@@ -0,0 +1,143 @@
+/*
+ * 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.code;
+
+import com.android.dx.rop.cst.CstString;
+
+/**
+ * A local variable item: either a name or a signature or both.
+ */
+public class LocalItem implements Comparable<LocalItem> {
+    /** {@code null-ok;} local variable name */
+    private final CstString name;
+
+    /** {@code null-ok;} local variable signature */
+    private final CstString signature;
+
+    /**
+     * Make a new item. If both name and signature are null, null is returned.
+     *
+     * TODO: intern these
+     *
+     * @param name {@code null-ok;} local variable name
+     * @param signature {@code null-ok;} local variable signature
+     * @return {@code non-null;} appropriate instance.
+     */
+    public static LocalItem make(CstString name, CstString signature) {
+        if (name == null && signature == null) {
+            return null;
+        }
+
+        return new LocalItem (name, signature);
+    }
+
+    /**
+     * Constructs instance.
+     *
+     * @param name {@code null-ok;} local variable name
+     * @param signature {@code null-ok;} local variable signature
+     */
+    private LocalItem(CstString name, CstString signature) {
+        this.name = name;
+        this.signature = signature;
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public boolean equals(Object other) {
+        if (!(other instanceof LocalItem)) {
+            return false;
+        }
+
+        LocalItem local = (LocalItem) other;
+
+        return 0 == compareTo(local);
+    }
+
+    /**
+     * Compares two strings like String.compareTo(), excepts treats a null
+     * as the least-possible string value.
+     *
+     * @return negative integer, zero, or positive integer in accordance
+     * with Comparable.compareTo()
+     */
+    private static int compareHandlesNulls(CstString a, CstString b) {
+        if (a == b) {
+            return 0;
+        } else if (a == null) {
+            return -1;
+        } else if (b == null) {
+            return 1;
+        } else {
+            return a.compareTo(b);
+        }
+    }
+
+    /** {@inheritDoc} */
+    public int compareTo(LocalItem local) {
+        int ret;
+
+        ret = compareHandlesNulls(name, local.name);
+
+        if (ret != 0) {
+            return ret;
+        }
+
+        ret = compareHandlesNulls(signature, local.signature);
+
+        return ret;
+    }
+
+
+    /** {@inheritDoc} */
+    @Override
+    public int hashCode() {
+        return (name == null ? 0 : name.hashCode()) * 31
+                + (signature == null ? 0 : signature.hashCode());
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public String toString() {
+        if (name != null && signature == null) {
+            return name.toQuoted();
+        } else if (name == null && signature == null) {
+            return "";
+        }
+
+        return "[" + (name == null ? "" : name.toQuoted())
+                + "|" + (signature == null ? "" : signature.toQuoted());
+    }
+
+    /**
+     * Gets name.
+     *
+     * @return {@code null-ok;} name
+     */
+    public CstString getName() {
+        return name;
+    }
+
+    /**
+     * Gets signature.
+     *
+     * @return {@code null-ok;} signature
+     */
+    public CstString getSignature() {
+        return signature;
+    }
+}