org.hdiv.web.servlet.tags.form.ValueFormatterHDIV.java Source code

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Here is the source code for org.hdiv.web.servlet.tags.form.ValueFormatterHDIV.java

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/**
 * Copyright 2005-2010 hdiv.org
 *
 * 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.hdiv.web.servlet.tags.form;

import java.beans.PropertyEditor;

import org.springframework.util.ObjectUtils;
import org.springframework.web.util.HtmlUtils;

/**
 * Package-visible helper class for formatting values for rendering via a form tag.
 * Supports two styles of formatting: plain and {@link PropertyEditor}-aware.
 *
 * <p>Plain formatting simply prevents the string '<code>null</code>' from appearing,
 * replacing it with an empty String, and adds HTML escaping as required.
 *
 * <p>{@link PropertyEditor}-aware formatting will attempt to use the supplied
 * {@link PropertyEditor} to render any non-String value before applying the
 * default rules of plain formatting.
 *
 * @author Gorka Vicente
 * @since 2.0.6
 */
abstract class ValueFormatterHDIV {

    /**
     * Build the display value of the supplied <code>Object</code>, HTML escaped
     * as required. This version is <strong>not</strong> {@link PropertyEditor}-aware.
     * @see #getDisplayString(Object, java.beans.PropertyEditor, boolean)
     */
    public static String getDisplayString(Object value, boolean htmlEscape) {
        String displayValue = ObjectUtils.getDisplayString(value);
        return (htmlEscape ? HtmlUtils.htmlEscape(displayValue) : displayValue);
    }

    /**
     * Build the display value of the supplied <code>Object</code>, HTML escaped
     * as required. If the supplied value is not a {@link String} and the supplied
     * {@link PropertyEditor} is not null then the {@link PropertyEditor} is used
     * to obtain the display value.
     * @see #getDisplayString(Object, boolean)
     */
    public static String getDisplayString(Object value, PropertyEditor propertyEditor, boolean htmlEscape) {
        if (propertyEditor != null && !(value instanceof String)) {
            try {
                propertyEditor.setValue(value);
                String text = propertyEditor.getAsText();
                if (text != null) {
                    return getDisplayString(text, htmlEscape);
                }
            } catch (Throwable ex) {
                // The PropertyEditor might not support this value... pass through.
            }
        }
        return getDisplayString(value, htmlEscape);
    }

}