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Commons Beanutils example source code file (

This example Commons Beanutils source code file ( is included in the "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Commons Beanutils tags/keywords

abstractarrayconverter, conversionexception, exception, int_model, list, model, model, no, object, object, string, string, stringarrayconverter, stringarrayconverter, util

The Commons Beanutils source code

 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.

package org.apache.commons.beanutils.converters;

import java.util.List;
import org.apache.commons.beanutils.ConversionException;

 * Standard {@link org.apache.commons.beanutils.Converter} implementation that converts an incoming
 * String into an array of String objects. On a conversion failure, returns
 * a specified default value or throws a {@link ConversionException} depending
 * on how this instance is constructed.
 * <p>
 * There is also some special handling where the input is of type int[].
 * See method convert for more details.  
 * @author Craig R. McClanahan
 * @version $Revision: 556229 $ $Date: 2007-07-14 07:11:19 +0100 (Sat, 14 Jul 2007) $
 * @since 1.4
 * @deprecated Replaced by the new {@link ArrayConverter} implementation

public final class StringArrayConverter extends AbstractArrayConverter {

    // ----------------------------------------------------------- Constructors

     * Create a {@link org.apache.commons.beanutils.Converter} that will throw
     * a {@link ConversionException} if a conversion error occurs.
    public StringArrayConverter() {

        this.defaultValue = null;
        this.useDefault = false;


     * Create a {@link org.apache.commons.beanutils.Converter} that will return
     * the specified default value if a conversion error occurs.
     * @param defaultValue The default value to be returned
    public StringArrayConverter(Object defaultValue) {

        this.defaultValue = defaultValue;
        this.useDefault = true;


    // ------------------------------------------------------- Static Variables

     * <p>Model object for type comparisons.

*/ private static final String[] MODEL = new String[0]; /** * <p> Model object for int arrays.

*/ private static final int[] INT_MODEL = new int[0]; // --------------------------------------------------------- Public Methods /** * Convert the specified input object into an output object of the * specified type. * <p> * If the value is already of type String[] then it is simply returned * unaltered. * <p> * If the value is of type int[], then a String[] is returned where each * element in the string array is the result of calling Integer.toString * on the corresponding element of the int array. This was added as a * result of bugzilla request #18297 though there is not complete * agreement that this feature should have been added. * <p> * In all other cases, this method calls toString on the input object, then * assumes the result is a comma-separated list of values. The values are * split apart into the individual items and returned as the elements of an * array. See class AbstractArrayConverter for the exact input formats * supported. * * @param type is the data type to which this value should be converted. * It is expected to be the class for type String[] (though this parameter * is actually ignored by this method). * * @param value is the input value to be converted. If null then the * default value is returned or an exception thrown if no default value * exists. * @return the converted value * * @exception ConversionException if conversion cannot be performed * successfully, or the input is null and there is no default value set * for this object. */ public Object convert(Class type, Object value) { // Deal with a null value if (value == null) { if (useDefault) { return (defaultValue); } else { throw new ConversionException("No value specified"); } } // Deal with the no-conversion-needed case if (MODEL.getClass() == value.getClass()) { return (value); } // Deal with the input value as an int array if (INT_MODEL.getClass() == value.getClass()) { int[] values = (int[]) value; String[] results = new String[values.length]; for (int i = 0; i < values.length; i++) { results[i] = Integer.toString(values[i]); } return (results); } // Parse the input value as a String into elements // and convert to the appropriate type try { List list = parseElements(value.toString()); String[] results = new String[list.size()]; for (int i = 0; i < results.length; i++) { results[i] = (String) list.get(i); } return (results); } catch (Exception e) { if (useDefault) { return (defaultValue); } else { throw new ConversionException(value.toString(), e); } } } }

Other Commons Beanutils examples (source code examples)

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