001/*
002 *  Licensed to the Apache Software Foundation (ASF) under one
003 *  or more contributor license agreements.  See the NOTICE file
004 *  distributed with this work for additional information
005 *  regarding copyright ownership.  The ASF licenses this file
006 *  to you under the Apache License, Version 2.0 (the
007 *  "License"); you may not use this file except in compliance
008 *  with the License.  You may obtain a copy of the License at
009 *
010 *        http://www.apache.org/licenses/LICENSE-2.0
011 *
012 *  Unless required by applicable law or agreed to in writing,
013 *  software distributed under the License is distributed on an
014 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 *  KIND, either express or implied.  See the License for the
016 *  specific language governing permissions and limitations
017 *  under the License.
018 */
019
020package org.apache.isis.core.commons.encoding;
021
022import java.io.ByteArrayInputStream;
023import java.io.ByteArrayOutputStream;
024import java.io.IOException;
025
026import org.apache.commons.codec.DecoderException;
027import org.apache.commons.codec.binary.Hex;
028
029import org.apache.isis.core.commons.exceptions.IsisException;
030
031public final class HexUtils {
032    
033    private HexUtils() {
034    }
035
036    public static String encoded(final Object object) {
037        final ByteArrayOutputStream baos = new ByteArrayOutputStream();
038        final DataOutputStreamExtended outputImpl = new DataOutputStreamExtended(baos);
039        try {
040            outputImpl.writeEncodable(object);
041            final byte[] byteArray = baos.toByteArray();
042            return new String(Hex.encodeHex(byteArray));
043        } catch (final IOException e) {
044            throw new IsisException("Failed to write object", e);
045        }
046    }
047
048    public static <T> T decoded(final String hexEncoded, Class<T> cls) {
049        final char[] chars = hexEncoded.toCharArray();
050        byte[] bytes;
051        try {
052            bytes = Hex.decodeHex(chars);
053            final ByteArrayInputStream bais = new ByteArrayInputStream(bytes);
054            final DataInputStreamExtended inputImpl = new DataInputStreamExtended(bais);
055            return inputImpl.readEncodable(cls);
056        } catch (final IOException ex) {
057            throw new IsisException("Failed to read object", ex);
058        } catch (final DecoderException ex) {
059            throw new IsisException("Failed to hex decode object", ex);
060        }
061    }
062
063}