feat(jdk8): move files to new folder to avoid resources compiled.

jdkSrc/jdk8/com/sun/tools/hat/internal/parser/MappedReadBuffer.java

@@ -0,0 +1,114 @@
+/*
+ * Copyright (c) 1997, 2008, 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.
+ */
+
+
+/*
+ * The Original Code is HAT. The Initial Developer of the
+ * Original Code is Bill Foote, with contributions from others
+ * at JavaSoft/Sun.
+ */
+
+package com.sun.tools.hat.internal.parser;
+
+import java.io.IOException;
+import java.io.RandomAccessFile;
+import java.nio.MappedByteBuffer;
+import java.nio.channels.FileChannel;
+
+/**
+ * Implementation of ReadBuffer using mapped file buffer
+ *
+ * @author A. Sundararajan
+ */
+class MappedReadBuffer implements ReadBuffer {
+    private MappedByteBuffer buf;
+
+    MappedReadBuffer(MappedByteBuffer buf) {
+        this.buf = buf;
+    }
+
+    // factory method to create correct ReadBuffer for a given file
+    static ReadBuffer create(RandomAccessFile file) throws IOException {
+        FileChannel ch = file.getChannel();
+        long size = ch.size();
+        // if file size is more than 2 GB and when file mapping is
+        // configured (default), use mapped file reader
+        if (canUseFileMap() && (size <= Integer.MAX_VALUE)) {
+            MappedByteBuffer buf;
+            try {
+                buf = ch.map(FileChannel.MapMode.READ_ONLY, 0, size);
+                ch.close();
+                return new MappedReadBuffer(buf);
+            } catch (IOException exp) {
+                exp.printStackTrace();
+                System.err.println("File mapping failed, will use direct read");
+                // fall through
+            }
+        } // else fall through
+        return new FileReadBuffer(file);
+    }
+
+    private static boolean canUseFileMap() {
+        // set jhat.disableFileMap to any value other than "false"
+        // to disable file mapping
+        String prop = System.getProperty("jhat.disableFileMap");
+        return prop == null || prop.equals("false");
+    }
+
+    private void seek(long pos) throws IOException {
+        assert pos <= Integer.MAX_VALUE :  "position overflow";
+        buf.position((int)pos);
+    }
+
+    public synchronized void get(long pos, byte[] res) throws IOException {
+        seek(pos);
+        buf.get(res);
+    }
+
+    public synchronized char getChar(long pos) throws IOException {
+        seek(pos);
+        return buf.getChar();
+    }
+
+    public synchronized byte getByte(long pos) throws IOException {
+        seek(pos);
+        return buf.get();
+    }
+
+    public synchronized short getShort(long pos) throws IOException {
+        seek(pos);
+        return buf.getShort();
+    }
+
+    public synchronized int getInt(long pos) throws IOException {
+        seek(pos);
+        return buf.getInt();
+    }
+
+    public synchronized long getLong(long pos) throws IOException {
+        seek(pos);
+        return buf.getLong();
+    }
+}