org.wicketstuff.rest.utils.wicket.StringConverterInterpolator.java Source code

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Here is the source code for org.wicketstuff.rest.utils.wicket.StringConverterInterpolator.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.wicketstuff.rest.utils.wicket;

import java.util.Locale;
import java.util.Map;

import org.apache.wicket.Application;
import org.apache.wicket.util.convert.IConverter;
import org.apache.wicket.util.string.Strings;
import org.apache.wicket.util.string.interpolator.MapVariableInterpolator;

/**
 * Utility class to convert strings to values and vice-versa. It relies on 
 * the Wicket converters registered for the current application.
 * 
 * @author andrea del bene
 *
 */
public class StringConverterInterpolator extends MapVariableInterpolator {

    private final Locale locale;

    public StringConverterInterpolator(String string, Map<?, ?> variables, boolean exceptionOnNullVarValue,
            Locale locale) {
        super(string, variables, exceptionOnNullVarValue);
        this.locale = locale;
    }

    @Override
    protected String getValue(String variableName) {
        Object value = super.getValue(variableName);

        if (value == null) {
            return null;
        } else if (value instanceof String) {
            // small optimization - no need to bother with conversion
            // for String vars, e.g. {label}
            return (String) value;
        } else {
            IConverter converter = getConverter(value.getClass());
            if (converter == null) {
                return Strings.toString(value);
            } else {
                return converter.convertToString(value, getLocale());
            }
        }
    }

    private IConverter getConverter(Class<? extends Object> clazz) {
        return Application.get().getConverterLocator().getConverter(clazz);
    }

    public Locale getLocale() {
        return locale;
    }

}