org.apache.wicket.core.util.lang.PropertyResolverConverter.java Source code

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Here is the source code for org.apache.wicket.core.util.lang.PropertyResolverConverter.java

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/*
 * 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.wicket.core.util.lang;

import java.util.Locale;

import org.apache.wicket.util.io.IClusterable;
import org.apache.wicket.IConverterLocator;
import org.apache.wicket.util.convert.IConverter;
import org.apache.wicket.util.lang.Objects;

/**
 * @author jcompagner
 */
public class PropertyResolverConverter implements IClusterable {
    private static final long serialVersionUID = 1L;

    private final IConverterLocator converterSupplier;
    private final Locale locale;

    /**
     * Construct.
     *
     * @param converterSupplier
     * @param locale
     */
    public PropertyResolverConverter(IConverterLocator converterSupplier, Locale locale) {
        this.converterSupplier = converterSupplier;
        this.locale = locale;
    }

    /**
     * @param <T>
     *            target type
     * @param object
     * @param clz
     * @return converted value of the type given, or null if the value cannot be converted to the
     *         given type.
     */
    public <T> T convert(Object object, Class<T> clz) {
        if (object == null) {
            return null;
        }
        if (clz.isAssignableFrom(object.getClass())) {
            @SuppressWarnings("unchecked")
            T result = (T) object;
            return result;
        }
        IConverter<T> converter = converterSupplier.getConverter(clz);
        if (object instanceof String) {
            return converter.convertToObject((String) object, locale);
        } else if (clz == String.class) {
            @SuppressWarnings("unchecked")
            T result = (T) convertToString(object, locale);
            return result;
        } else {
            T result;
            try {
                result = Objects.convertValue(object, clz);
            } catch (RuntimeException ex) {
                result = null;
            }
            if (result == null) {
                String tmp = convertToString(object, locale);
                result = converter.convertToObject(tmp, locale);
            }
            return result;
        }
    }

    protected <C> String convertToString(C object, Locale locale) {
        @SuppressWarnings("unchecked")
        Class<C> type = (Class<C>) object.getClass();

        IConverter<C> converterForObj = converterSupplier.getConverter(type);
        return converterForObj.convertToString(object, locale);
    }
}