jdk/src/share/classes/java/time/zone/Ser.java
changeset 15289 3ac550392e43
child 17474 8c100beabcc0
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/share/classes/java/time/zone/Ser.java	Tue Jan 22 20:59:21 2013 -0800
@@ -0,0 +1,256 @@
+/*
+ * Copyright (c) 2012, 2013, 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.
+ */
+
+/*
+ * This file is available under and governed by the GNU General Public
+ * License version 2 only, as published by the Free Software Foundation.
+ * However, the following notice accompanied the original version of this
+ * file:
+ *
+ * Copyright (c) 2011-2012, Stephen Colebourne & Michael Nascimento Santos
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *  * Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ *
+ *  * Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ *  * Neither the name of JSR-310 nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+package java.time.zone;
+
+import java.io.DataInput;
+import java.io.DataOutput;
+import java.io.Externalizable;
+import java.io.IOException;
+import java.io.InvalidClassException;
+import java.io.ObjectInput;
+import java.io.ObjectOutput;
+import java.io.StreamCorruptedException;
+import java.time.ZoneOffset;
+
+/**
+ * The shared serialization delegate for this package.
+ *
+ * <h3>Implementation notes</h3>
+ * This class is mutable and should be created once per serialization.
+ *
+ * @serial include
+ * @since 1.8
+ */
+final class Ser implements Externalizable {
+
+    /**
+     * Serialization version.
+     */
+    private static final long serialVersionUID = -8885321777449118786L;
+
+    /** Type for ZoneRules. */
+    static final byte ZRULES = 1;
+    /** Type for ZoneOffsetTransition. */
+    static final byte ZOT = 2;
+    /** Type for ZoneOffsetTransition. */
+    static final byte ZOTRULE = 3;
+
+    /** The type being serialized. */
+    private byte type;
+    /** The object being serialized. */
+    private Object object;
+
+    /**
+     * Constructor for deserialization.
+     */
+    public Ser() {
+    }
+
+    /**
+     * Creates an instance for serialization.
+     *
+     * @param type  the type
+     * @param object  the object
+     */
+    Ser(byte type, Object object) {
+        this.type = type;
+        this.object = object;
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Implements the {@code Externalizable} interface to write the object.
+     *
+     * @param out  the data stream to write to, not null
+     */
+    public void writeExternal(ObjectOutput out) throws IOException {
+        writeInternal(type, object, out);
+    }
+
+    static void write(Object object, DataOutput out) throws IOException {
+        writeInternal(ZRULES, object, out);
+    }
+
+    private static void writeInternal(byte type, Object object, DataOutput out) throws IOException {
+        out.writeByte(type);
+        switch (type) {
+            case ZRULES:
+                ((ZoneRules) object).writeExternal(out);
+                break;
+            case ZOT:
+                ((ZoneOffsetTransition) object).writeExternal(out);
+                break;
+            case ZOTRULE:
+                ((ZoneOffsetTransitionRule) object).writeExternal(out);
+                break;
+            default:
+                throw new InvalidClassException("Unknown serialized type");
+        }
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Implements the {@code Externalizable} interface to read the object.
+     *
+     * @param in  the data to read, not null
+     */
+    public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
+        type = in.readByte();
+        object = readInternal(type, in);
+    }
+
+    static Object read(DataInput in) throws IOException, ClassNotFoundException {
+        byte type = in.readByte();
+        return readInternal(type, in);
+    }
+
+    private static Object readInternal(byte type, DataInput in) throws IOException, ClassNotFoundException {
+        switch (type) {
+            case ZRULES:
+                return ZoneRules.readExternal(in);
+            case ZOT:
+                return ZoneOffsetTransition.readExternal(in);
+            case ZOTRULE:
+                return ZoneOffsetTransitionRule.readExternal(in);
+            default:
+                throw new StreamCorruptedException("Unknown serialized type");
+        }
+    }
+
+    /**
+     * Returns the object that will replace this one.
+     *
+     * @return the read object, should never be null
+     */
+    private Object readResolve() {
+         return object;
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Writes the state to the stream.
+     *
+     * @param offset  the offset, not null
+     * @param out  the output stream, not null
+     * @throws IOException if an error occurs
+     */
+    static void writeOffset(ZoneOffset offset, DataOutput out) throws IOException {
+        final int offsetSecs = offset.getTotalSeconds();
+        int offsetByte = offsetSecs % 900 == 0 ? offsetSecs / 900 : 127;  // compress to -72 to +72
+        out.writeByte(offsetByte);
+        if (offsetByte == 127) {
+            out.writeInt(offsetSecs);
+        }
+    }
+
+    /**
+     * Reads the state from the stream.
+     *
+     * @param in  the input stream, not null
+     * @return the created object, not null
+     * @throws IOException if an error occurs
+     */
+    static ZoneOffset readOffset(DataInput in) throws IOException {
+        int offsetByte = in.readByte();
+        return (offsetByte == 127 ? ZoneOffset.ofTotalSeconds(in.readInt()) : ZoneOffset.ofTotalSeconds(offsetByte * 900));
+    }
+
+    //-----------------------------------------------------------------------
+    /**
+     * Writes the state to the stream.
+     *
+     * @param epochSec  the epoch seconds, not null
+     * @param out  the output stream, not null
+     * @throws IOException if an error occurs
+     */
+    static void writeEpochSec(long epochSec, DataOutput out) throws IOException {
+        if (epochSec >= -4575744000L && epochSec < 10413792000L && epochSec % 900 == 0) {  // quarter hours between 1825 and 2300
+            int store = (int) ((epochSec + 4575744000L) / 900);
+            out.writeByte((store >>> 16) & 255);
+            out.writeByte((store >>> 8) & 255);
+            out.writeByte(store & 255);
+        } else {
+            out.writeByte(255);
+            out.writeLong(epochSec);
+        }
+    }
+
+    /**
+     * Reads the state from the stream.
+     *
+     * @param in  the input stream, not null
+     * @return the epoch seconds, not null
+     * @throws IOException if an error occurs
+     */
+    static long readEpochSec(DataInput in) throws IOException {
+        int hiByte = in.readByte() & 255;
+        if (hiByte == 255) {
+            return in.readLong();
+        } else {
+            int midByte = in.readByte() & 255;
+            int loByte = in.readByte() & 255;
+            long tot = ((hiByte << 16) + (midByte << 8) + loByte);
+            return (tot * 900) - 4575744000L;
+        }
+    }
+
+}