core/src/main/java/org/apache/struts2/components/ClosingUIBean.java

/*
 * 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.apache.struts2.components;

import com.opensymphony.xwork2.util.ValueStack;
import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.LogManager;
import org.apache.struts2.views.annotations.StrutsTagAttribute;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.Writer;

/**
 * ClosingUIBean is the standard superclass for UI components such as div etc.
 */
public abstract class ClosingUIBean extends UIBean {
    private static final Logger LOG = LogManager.getLogger(ClosingUIBean.class);

    protected ClosingUIBean(ValueStack stack, HttpServletRequest request, HttpServletResponse response) {
        super(stack, request, response);
    }

    String openTemplate;

    public abstract String getDefaultOpenTemplate();

    @StrutsTagAttribute(description="Set template to use for opening the rendered html.")
    public void setOpenTemplate(String openTemplate) {
        this.openTemplate = openTemplate;
    }

    @Override
    public boolean start(Writer writer) {
        boolean result = super.start(writer);
        try {
            evaluateParams();

            mergeTemplate(writer, buildTemplateName(openTemplate, getDefaultOpenTemplate()));
        } catch (Exception e) {
            LOG.error("Could not open template", e);
        }

        return result;
    }
}