1 /*

     2  * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  */

    23 

    24 

    25 package org.graalvm.util;

    26 

    27 import java.io.DataInputStream;

    28 import java.io.IOException;

    29 import java.io.InputStream;

    30 

    31 /**

    32  * A stream that can read (trivial) values using their in-band data type information, intended for

    33  * use with {@link TypedDataOutputStream}.

    34  */

    35 public class TypedDataInputStream extends DataInputStream {

    36     public TypedDataInputStream(InputStream in) {

    37         super(in);

    38     }

    39 

    40     /**

    41      * Reads a single value, using the data type encoded in the stream.

    42      *

    43      * @return The read value, such as a boxed primitive or a {@link String}.

    44      * @exception IOException in case of an I/O error.

    45      */

    46     public Object readTypedValue() throws IOException {

    47         Object value;

    48         final byte type = readByte();

    49         switch (type) {

    50             case 'Z':

    51                 value = readBoolean();

    52                 break;

    53             case 'B':

    54                 value = readByte();

    55                 break;

    56             case 'S':

    57                 value = readShort();

    58                 break;

    59             case 'C':

    60                 value = readChar();

    61                 break;

    62             case 'I':

    63                 value = readInt();

    64                 break;

    65             case 'J':

    66                 value = readLong();

    67                 break;

    68             case 'F':

    69                 value = readFloat();

    70                 break;

    71             case 'D':

    72                 value = readDouble();

    73                 break;

    74             case 'U':

    75                 value = readUTF();

    76                 break;

    77             default:

    78                 throw new IOException("Unsupported type: " + Integer.toHexString(type));

    79         }

    80         return value;

    81     }

    82 }