jelly-tags/dynabean/src/java/org/apache/commons/jelly/tags/dynabean/DynabeanTag.java

/*
 * Copyright 2002,2004 The Apache Software Foundation.
 *
 * 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.apache.commons.jelly.tags.dynabean;

import org.apache.commons.beanutils.DynaBean;
import org.apache.commons.beanutils.DynaClass;
import org.apache.commons.jelly.JellyTagException;
import org.apache.commons.jelly.MissingAttributeException;
import org.apache.commons.jelly.TagSupport;
import org.apache.commons.jelly.XMLOutput;


/** A tag which conditionally evaluates its body based on some condition
  *
  * @author Theo Niemeijer
  * @version $Revision: 1.5 $
  */
public class DynabeanTag extends TagSupport {

    private DynaClass dynaClass;
    private String var;

    public DynabeanTag() {
    }

    // Tag interface
    //-------------------------------------------------------------------------
    public void doTag(XMLOutput output) throws MissingAttributeException, JellyTagException {

        if (dynaClass == null) {
            throw new MissingAttributeException( "dynaclass" );
        }

        if (var == null) {
            throw new MissingAttributeException( "var" );
        }

        try {
            // Create dynabean instance for this dynaclass
            DynaBean dynaBean = dynaClass.newInstance();

            // Place new dynabean in context as a variable
            context.setVariable(getVar(), dynaBean);
        } catch (IllegalAccessException e) {
            throw new JellyTagException(e);
        } catch (InstantiationException e) {
            throw new JellyTagException(e);
        }
    }

    // Properties
    //-------------------------------------------------------------------------

    /**
     * Sets the DynaClass of the new instance to create
     */
    public void setDynaclass(DynaClass dynaClass) {
        this.dynaClass = dynaClass;
    }

    public String getVar() {
        return var;
    }

    /**
     * Sets the name of the variable to export the new DynaBean instance to
     */
    public void setVar(String var) {
        this.var = var;
    }


}