org.jdal.beans.SimpleTypeConverter.java Source code

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Here is the source code for org.jdal.beans.SimpleTypeConverter.java

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/*
 * Copyright 2009-2012 the original author or authors.
 *
 * Licensed 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.jdal.beans;

import java.beans.PropertyEditor;
import java.io.Serializable;

import org.springframework.beans.TypeMismatchException;
import org.springframework.core.MethodParameter;
import org.springframework.util.ClassUtils;

/**
 * Type converter that also convert Objects to String.
 * 
 * @author Jose Luis Martin
 * @sice 1.1
 */
public class SimpleTypeConverter extends org.springframework.beans.SimpleTypeConverter implements Serializable {

    @Override
    public <T> T convertIfNecessary(Object value, Class<T> requiredType) throws TypeMismatchException {
        return convertIfNecessary(value, requiredType, (MethodParameter) null);
    }

    /**
     * {@inheritDoc}
     */
    @SuppressWarnings("unchecked")
    @Override
    public <T> T convertIfNecessary(Object value, Class<T> requiredType, MethodParameter methodParam)
            throws TypeMismatchException {

        T convertedValue = null;
        try {
            convertedValue = super.convertIfNecessary(value, requiredType, methodParam);
        } catch (TypeMismatchException tme) {
            // Try Object to String conversion
            if (ClassUtils.isAssignable(String.class, requiredType)) {
                if (value != null) {
                    PropertyEditor pe = findCustomEditor(value.getClass(), null);
                    if (pe != null) {
                        pe.setValue(value);
                        return (T) pe.getAsText();
                    } else { // Object to String
                        return (T) value.toString();
                    }
                } else { // null to String
                    return (T) "";
                }
            } else {
                throw tme;
            }
        }

        return convertedValue;
    }

}