com.cyclopsgroup.waterview.utils.TagSupport.java Source code

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Here is the source code for com.cyclopsgroup.waterview.utils.TagSupport.java

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/* ==========================================================================
 * Copyright 2002-2005 Cyclops Group Community
 * 
 * Licensed under the Open Software License, Version 2.1 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://opensource.org/licenses/osl-2.1.php
 *
 *  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 com.cyclopsgroup.waterview.utils;

import org.apache.commons.beanutils.PropertyUtils;
import org.apache.commons.jelly.JellyTagException;
import org.apache.commons.jelly.MissingAttributeException;

/**
 * Base jelly tag
 * 
 * @author <a href="mailto:jiaqi.guo@gmail.com">Jiaqi Guo </a>
 */
public abstract class TagSupport extends TagSupportBase {
    /**
     * Throw MissingAttributeException if an attribute is missing
     *
     * @param name Attribute name
     * @throws JellyTagException Throw it out
     */
    protected final void requireAttribute(String name) throws JellyTagException {
        Object value = null;
        try {
            value = PropertyUtils.getProperty(this, name);
        } catch (Exception e) {
            throw new JellyTagException("Attribute [" + name + "] is not defined in tag");
        }
        if (value == null) {
            throw new MissingAttributeException(name);
        }
    }
}