/*
* Copyright (c) 2018, 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 jdk.internal.vm.compiler.libgraal;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.util.LinkedHashMap;
import java.util.Map;
Facilities for encoding/decoding a set of options to/from a byte array.
/**
* Facilities for encoding/decoding a set of options to/from a byte array.
*/
public final class OptionsEncoder {
private OptionsEncoder() {
}
Determines if value is supported by encode(Map<String,Object>). /**
* Determines if {@code value} is supported by {@link #encode(Map)}.
*/
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();
}
Encodes options into a byte array. Throws: - IllegalArgumentException – if any value in
options is not supported
/**
* Encodes {@code options} into a byte array.
*
* @throws IllegalArgumentException if any value in {@code options} is not
* {@linkplain #isValueSupported(Object) supported}
*/
public static byte[] encode(final Map<String, Object> options) {
try (ByteArrayOutputStream baout = new ByteArrayOutputStream()) {
try (DataOutputStream out = new DataOutputStream(baout)) {
out.writeInt(options.size());
for (Map.Entry<String, Object> e : options.entrySet()) {
final String key = e.getKey();
out.writeUTF(key);
final Object value = e.getValue();
final Class<?> valueClz = value.getClass();
if (valueClz == Boolean.class) {
out.writeByte('Z');
out.writeBoolean((Boolean) value);
} else if (valueClz == Byte.class) {
out.writeByte('B');
out.writeByte((Byte) value);
} else if (valueClz == Short.class) {
out.writeByte('S');
out.writeShort((Short) value);
} else if (valueClz == Character.class) {
out.writeByte('C');
out.writeChar((Character) value);
} else if (valueClz == Integer.class) {
out.writeByte('I');
out.writeInt((Integer) value);
} else if (valueClz == Long.class) {
out.writeByte('J');
out.writeLong((Long) value);
} else if (valueClz == Float.class) {
out.writeByte('F');
out.writeFloat((Float) value);
} else if (valueClz == Double.class) {
out.writeByte('D');
out.writeDouble((Double) value);
} else if (valueClz == String.class) {
out.writeByte('U');
out.writeUTF((String) value);
} else if (valueClz.isEnum()) {
out.writeByte('U');
out.writeUTF(((Enum<?>) value).name());
} else {
throw new IllegalArgumentException(String.format("Key: %s, Value: %s, Value type: %s", key, value, valueClz));
}
}
}
return baout.toByteArray();
} catch (IOException ioe) {
throw new IllegalArgumentException(ioe);
}
}
Decodes input into a name/value map. Throws: - IllegalArgumentException – if
input cannot be decoded
/**
* Decodes {@code input} into a name/value map.
*
* @throws IllegalArgumentException if {@code input} cannot be decoded
*/
public static Map<String, Object> decode(byte[] input) {
Map<String, Object> res = new LinkedHashMap<>();
try (DataInputStream in = new DataInputStream(new ByteArrayInputStream(input))) {
final int size = in.readInt();
for (int i = 0; i < size; i++) {
final String key = in.readUTF();
final Object value;
final byte type = in.readByte();
switch (type) {
case 'Z':
value = in.readBoolean();
break;
case 'B':
value = in.readByte();
break;
case 'S':
value = in.readShort();
break;
case 'C':
value = in.readChar();
break;
case 'I':
value = in.readInt();
break;
case 'J':
value = in.readLong();
break;
case 'F':
value = in.readFloat();
break;
case 'D':
value = in.readDouble();
break;
case 'U':
value = in.readUTF();
break;
default:
throw new IllegalArgumentException("Unsupported value type: " + Integer.toHexString(type));
}
res.put(key, value);
}
if (in.available() != 0) {
throw new IllegalArgumentException(in.available() + " undecoded bytes");
}
} catch (IOException ioe) {
throw new IllegalArgumentException(ioe);
}
return res;
}
}