src/jdk.internal.vm.compiler/share/classes/org.graalvm.util/src/org/graalvm/util/TypedDataOutputStream.java
/*
* Copyright (c) 2019, 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.
*
* 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 org.graalvm.util;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.OutputStream;
/**
* A stream that can write (trivial) values together with their data type, for use with
* {@link TypedDataInputStream}.
*/
public class TypedDataOutputStream extends DataOutputStream {
/** Determines if {@code value} is supported by {@link #writeTypedValue(Object)}. */
public static boolean isValueSupported(Object value) {
if (value == null) {
return false;
}
Class<?> valueClass = value.getClass();
return valueClass == Boolean.class ||
valueClass == Byte.class ||
valueClass == Short.class ||
valueClass == Character.class ||
valueClass == Integer.class ||
valueClass == Long.class ||
valueClass == Float.class ||
valueClass == Double.class ||
valueClass == String.class ||
value.getClass().isEnum();
}
public TypedDataOutputStream(OutputStream out) {
super(out);
}
/**
* Writes the value that is represented by the given non-null object, together with information
* on the value's data type.
*
* @param value A value of a {@linkplain #isValueSupported supported type}.
* @exception IllegalArgumentException when the provided type is not supported.
* @exception IOException in case of an I/O error.
*/
public void writeTypedValue(Object value) throws IOException {
Class<?> valueClz = value.getClass();
if (valueClz == Boolean.class) {
this.writeByte('Z');
this.writeBoolean((Boolean) value);
} else if (valueClz == Byte.class) {
this.writeByte('B');
this.writeByte((Byte) value);
} else if (valueClz == Short.class) {
this.writeByte('S');
this.writeShort((Short) value);
} else if (valueClz == Character.class) {
this.writeByte('C');
this.writeChar((Character) value);
} else if (valueClz == Integer.class) {
this.writeByte('I');
this.writeInt((Integer) value);
} else if (valueClz == Long.class) {
this.writeByte('J');
this.writeLong((Long) value);
} else if (valueClz == Float.class) {
this.writeByte('F');
this.writeFloat((Float) value);
} else if (valueClz == Double.class) {
this.writeByte('D');
this.writeDouble((Double) value);
} else if (valueClz == String.class) {
this.writeByte('U');
this.writeUTF((String) value);
} else if (valueClz.isEnum()) {
this.writeByte('U');
this.writeUTF(((Enum<?>) value).name());
} else {
throw new IllegalArgumentException(String.format("Unsupported type: Value: %s, Value type: %s", value, valueClz));
}
}
}