8294982: Implementation of Classfile API

Reviewed-by: ihse, psandoz, mcimadamore

src/java.base/share/classes/jdk/internal/classfile/constantpool/LongEntry.java

@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2022, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package jdk.internal.classfile.constantpool;
+
+import jdk.internal.classfile.TypeKind;
+import jdk.internal.classfile.impl.AbstractPoolEntry;
+
+/**
+ * Models a {@code CONSTANT_Long_info} constant in the constant pool of a
+ * classfile.
+ */
+public sealed interface LongEntry
+        extends AnnotationConstantValueEntry, ConstantValueEntry
+        permits AbstractPoolEntry.LongEntryImpl {
+
+    /**
+     * {@return the long value}
+     */
+    long longValue();
+
+    /**
+     * {@return the type of the constant}
+     */
+    @Override
+    default TypeKind typeKind() {
+        return TypeKind.LongType;
+    }
+}