1 files changed, 88 insertions, 0 deletions
diff --git a/src/main/javassist/bytecode/NestMembersAttribute.java b/src/main/javassist/bytecode/NestMembersAttribute.java
new file mode 100644
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+++ b/src/main/javassist/bytecode/NestMembersAttribute.java
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+/*
+ * Javassist, a Java-bytecode translator toolkit.
+ * Copyright (C) 1999- Shigeru Chiba. All Rights Reserved.
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License.  Alternatively, the contents of this file may be used under
+ * the terms of the GNU Lesser General Public License Version 2.1 or later,
+ * or the Apache License Version 2.0.
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ */
+
+package javassist.bytecode;
+
+import java.io.DataInputStream;
+import java.io.IOException;
+import java.util.Map;
+
+/**
+ * <code>NestMembers_attribute</code>.
+ * It was introduced by JEP-181.  See JVMS 4.7.29 for the specification.
+ *
+ * @since 3.24
+ */
+public class NestMembersAttribute extends AttributeInfo {
+    /**
+     * The name of this attribute <code>"NestMembers"</code>.
+     */
+    public static final String tag = "NestMembers";
+
+    NestMembersAttribute(ConstPool cp, int n, DataInputStream in) throws IOException {
+        super(cp, n, in);
+    }
+
+    private NestMembersAttribute(ConstPool cp, byte[] info) {
+        super(cp, tag, info);
+    }
+
+    /**
+     * Makes a copy.  Class names are replaced according to the
+     * given <code>Map</code> object.
+     *
+     * @param newCp     the constant pool table used by the new copy.
+     * @param classnames        pairs of replaced and substituted
+     *                          class names.
+     */
+    @Override
+    public AttributeInfo copy(ConstPool newCp, Map<String, String> classnames) {
+        byte[] src = get();
+        byte[] dest = new byte[src.length];
+        ConstPool cp = getConstPool();
+
+        int n = ByteArray.readU16bit(src, 0);
+        ByteArray.write16bit(n, dest, 0);
+
+        for (int i = 0, j = 2; i < n; ++i, j += 2) {
+            int index = ByteArray.readU16bit(src, j);
+            int newIndex = cp.copy(index, newCp, classnames);
+            ByteArray.write16bit(newIndex, dest, j);
+        }
+
+        return new NestMembersAttribute(newCp, dest);
+    }
+
+    /**
+     * Returns <code>number_of_classes</code>.
+     * @return the number of the classes recorded in this attribute.
+     */
+    public int numberOfClasses() {
+        return ByteArray.readU16bit(info, 0);
+    }
+
+    /** Returns <code>classes[index]</code>.
+     * 
+     * @param index   the index into <code>classes</code>.
+     * @return the value at the given index in the <code>classes</code> array.
+     *   It is an index into the constant pool.
+     *   The constant pool entry at the returned index is a
+     *   <code>CONSTANT_Class_info</code> structure.
+     */
+    public int memberClass(int index) {
+        return ByteArray.readU16bit(info, index * 2 + 2);
+    }
+}