abstractdecoratormapper.java

OS(OpenSymphony)的SiteMesh是一个用来在JSP中实现页面布局和装饰（layout and decoration）的框架组件

/*
 * Title:        AbstractDecoratorMapper
 * Description:
 *
 * This software is published under the terms of the OpenSymphony Software
 * License version 1.1, of which a copy has been included with this
 * distribution in the LICENSE.txt file.
 */

package com.opensymphony.module.sitemesh.mapper;

import com.opensymphony.module.sitemesh.Config;
import com.opensymphony.module.sitemesh.Decorator;
import com.opensymphony.module.sitemesh.DecoratorMapper;
import com.opensymphony.module.sitemesh.Page;

import javax.servlet.http.HttpServletRequest;
import java.util.Properties;

/**
 * Abstract DecoratorMapper implementation for easy creation of new DecoratorMappers.
 *
 * <p>Typically, an implementation would override getNamedDecorator() <b>or</b> getDecorator().
 * If a Decorator cannot be returned from either of these, then they should delegate to their
 * superclass.</p>
 *
 * @author <a href="mailto:[e-mail]">Joe Walnes</a>
 * @version $Revision: 1.1 $
 *
 * @see com.opensymphony.module.sitemesh.DecoratorMapper
 */
public abstract class AbstractDecoratorMapper implements DecoratorMapper {
    /** Parent DecoratorMapper. */
    protected DecoratorMapper parent = null;
    protected Config config = null;

    /** Set parent. */
    public void init(Config config, Properties properties, DecoratorMapper parent) throws InstantiationException {
        this.parent = parent;
        this.config = config;
    }

    /** Delegate to parent. */
    public Decorator getDecorator(HttpServletRequest request, Page page) {
        return parent.getDecorator(request, page);
    }

    /** Delegate to parent. */
    public Decorator getNamedDecorator(HttpServletRequest request, String name) {
        return parent.getNamedDecorator(request, name);
    }
}