wicket.contrib.groovy.builder.util.AttributeUtils.java Source code

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Here is the source code for wicket.contrib.groovy.builder.util.AttributeUtils.java

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/**
 * 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 wicket.contrib.groovy.builder.util;

import groovy.lang.IntRange;

import java.io.Serializable;
import java.util.Map;

import org.apache.commons.beanutils.ConvertUtils;
import org.apache.commons.lang.StringUtils;

import wicket.contrib.groovy.builder.WicketComponentBuilderException;
import wicket.model.IModel;
import wicket.model.Model;

/**
 * Some general utilities for pulling values from the attributes map.
 * 
 * @author Kevin Galligan
 *
 */
public class AttributeUtils {
    public static boolean booleanValue(Object arg) {
        if (arg instanceof Boolean)
            return ((Boolean) arg).booleanValue();
        else
            return Boolean.parseBoolean(arg.toString());
    }

    public static IModel modelValue(Serializable arg) {
        if (arg instanceof IModel)
            return (IModel) arg;
        else
            return new Model(arg);
    }

    public static IntRange intRangeValue(Object arg) {
        if (arg == null)
            return null;
        if (arg instanceof IntRange)
            return (IntRange) arg;
        else
            throw new WicketComponentBuilderException("Range must be of type IntRange");
    }

    public static Class classValue(Object arg) throws ClassNotFoundException {
        if (arg instanceof Class)
            return (Class) arg;
        else if (arg instanceof String)
            return Class.forName((String) arg);
        else
            throw new WicketComponentBuilderException("Can't figure out Class type");
    }

    public static Class classValueSafe(Object arg) {
        try {
            return classValue(arg);
        } catch (ClassNotFoundException e) {
            throw new WicketComponentBuilderException("Can't get Class value", e);
        }
    }

    public static Object multiName(Map attrs, String[] names) {
        for (int i = 0; i < names.length; i++) {
            String name = names[i];
            Object value = attrs.remove(name);
            if (value != null)
                return value;
        }

        return null;
    }

    public static Object multiNameOptional(Map attrs, String[] names) {
        return multiName(attrs, names);
    }

    public static Object multiNameRequired(Map attrs, String[] names) {
        Object value = multiName(attrs, names);
        if (value == null)
            throw new WicketComponentBuilderException("One of " + StringUtils.join(names, ',') + " required");

        return value;
    }

    public static Object generalAttributeConversion(Class expectedType, Object value) {
        if (value instanceof String) {
            if (expectedType.equals(Class.class)) {
                try {
                    value = AttributeUtils.classValue(value);
                } catch (ClassNotFoundException e) {
                    throw new WicketComponentBuilderException(
                            "Attribute conversion error.  Could not find class '" + value.toString() + "'", e);
                }
            }
            if (expectedType.equals(String.class) == false)
                value = ConvertUtils.convert((String) value, expectedType);
        }

        return value;
    }
}