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Commons Beanutils example source code file (StringArrayConverter.java)

This example Commons Beanutils source code file (StringArrayConverter.java) is included in the DevDaily.com "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 StringArrayConverter.java 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
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * 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)

Here is a short list of links related to this Commons Beanutils StringArrayConverter.java source code file:

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