001    /*
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  You may obtain a copy of the License at
008     *
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     *
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the License for the specific language governing permissions and
015     * limitations under the License.
016     */
017    
018    
019    package org.apache.commons.beanutils.converters;
020    
021    
022    import java.util.List;
023    import org.apache.commons.beanutils.ConversionException;
024    
025    
026    /**
027     * <p>Standard {@link org.apache.commons.beanutils.Converter} implementation that converts an incoming
028     * String into a primitive array of byte.  On a conversion failure, returns
029     * a specified default value or throws a {@link ConversionException} depending
030     * on how this instance is constructed.</p>
031     *
032     * @author Craig R. McClanahan
033     * @version $Revision: 556229 $ $Date: 2007-07-14 07:11:19 +0100 (Sat, 14 Jul 2007) $
034     * @since 1.4
035     * @deprecated Replaced by the new {@link ArrayConverter} implementation
036     */
037    
038    public final class ByteArrayConverter extends AbstractArrayConverter {
039    
040    
041        // ----------------------------------------------------------- Constructors
042    
043    
044        /**
045         * Create a {@link org.apache.commons.beanutils.Converter} that will
046         * throw a {@link ConversionException} if a conversion error occurs.
047         */
048        public ByteArrayConverter() {
049    
050            this.defaultValue = null;
051            this.useDefault = false;
052    
053        }
054    
055    
056        /**
057         * Create a {@link org.apache.commons.beanutils.Converter} that will return
058         * the specified default value if a conversion error occurs.
059         *
060         * @param defaultValue The default value to be returned
061         */
062        public ByteArrayConverter(Object defaultValue) {
063    
064            this.defaultValue = defaultValue;
065            this.useDefault = true;
066    
067        }
068    
069    
070        // ------------------------------------------------------- Static Variables
071    
072    
073        /**
074         * <p>Model object for type comparisons.</p>
075         */
076        private static final byte[] MODEL = new byte[0];
077    
078    
079        // --------------------------------------------------------- Public Methods
080    
081    
082        /**
083         * Convert the specified input object into an output object of the
084         * specified type.
085         *
086         * @param type Data type to which this value should be converted
087         * @param value The input value to be converted
088         * @return the converted value
089         * @exception ConversionException if conversion cannot be performed
090         *  successfully
091         */
092        public Object convert(Class type, Object value) {
093    
094            // Deal with a null value
095            if (value == null) {
096                if (useDefault) {
097                    return (defaultValue);
098                } else {
099                    throw new ConversionException("No value specified");
100                }
101            }
102    
103            // Deal with the no-conversion-needed case
104            if (MODEL.getClass() == value.getClass()) {
105                return (value);
106            }
107    
108            // Deal with input value as a String array
109            if (strings.getClass() == value.getClass()) {
110                try {
111                    String[] values = (String[]) value;
112                    byte[] results = new byte[values.length];
113                    for (int i = 0; i < values.length; i++) {
114                        results[i] = Byte.parseByte(values[i]);
115                    }
116                    return (results);
117                } catch (Exception e) {
118                    if (useDefault) {
119                        return (defaultValue);
120                    } else {
121                        throw new ConversionException(value.toString(), e);
122                    }
123                }
124            }
125    
126            // Parse the input value as a String into elements
127            // and convert to the appropriate type
128            try {
129                List list = parseElements(value.toString());
130                byte[] results = new byte[list.size()];
131                for (int i = 0; i < results.length; i++) {
132                    results[i] = Byte.parseByte((String) list.get(i));
133                }
134                return (results);
135            } catch (Exception e) {
136                if (useDefault) {
137                    return (defaultValue);
138                } else {
139                    throw new ConversionException(value.toString(), e);
140                }
141            }
142    
143        }
144    
145    
146    }