/*
* Copyright (c) 2019, 2020, 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
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*/
package org.graalvm.util;
import java.io.DataInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.StandardCharsets;
A stream that can read (trivial) values using their in-band data type information, intended for use with TypedDataOutputStream
. /**
* A stream that can read (trivial) values using their in-band data type information, intended for
* use with {@link TypedDataOutputStream}.
*/
public class TypedDataInputStream extends DataInputStream {
public TypedDataInputStream(InputStream in) {
super(in);
}
Reads a single value, using the data type encoded in the stream.
Throws: - IOException – in case of an I/O error.
Returns: The read value, such as a boxed primitive or a String
.
/**
* Reads a single value, using the data type encoded in the stream.
*
* @return The read value, such as a boxed primitive or a {@link String}.
* @exception IOException in case of an I/O error.
*/
public Object readTypedValue() throws IOException {
Object value;
final byte type = readByte();
switch (type) {
case 'Z':
value = readBoolean();
break;
case 'B':
value = readByte();
break;
case 'S':
value = readShort();
break;
case 'C':
value = readChar();
break;
case 'I':
value = readInt();
break;
case 'J':
value = readLong();
break;
case 'F':
value = readFloat();
break;
case 'D':
value = readDouble();
break;
case 'U':
int len = readInt();
byte[] bytes = new byte[len];
readFully(bytes);
value = new String(bytes, StandardCharsets.UTF_8);
break;
default:
throw new IOException("Unsupported type: " + Integer.toHexString(type));
}
return value;
}
}