strutsbodytagsupport.java

struts 2 核心包 的源码 有错误是难免的

// Decompiled by Jad v1.5.8e2. Copyright 2001 Pavel Kouznetsov.
// Jad home page: http://kpdus.tripod.com/jad.html
// Decompiler options: packimports(3) fieldsfirst ansi space 
// Source File Name:   StrutsBodyTagSupport.java

package org.apache.struts2.views.jsp;

import com.opensymphony.xwork2.util.ValueStack;
import java.io.PrintWriter;
import javax.servlet.jsp.tagext.BodyContent;
import javax.servlet.jsp.tagext.BodyTagSupport;
import org.apache.struts2.util.FastByteArrayOutputStream;
import org.apache.struts2.views.util.ContextUtil;

// Referenced classes of package org.apache.struts2.views.jsp:
//			TagUtils

public class StrutsBodyTagSupport extends BodyTagSupport
{

	private static final long serialVersionUID = 0xef52d0e8506c7401L;

	public StrutsBodyTagSupport()
	{
	}

	public void setId(String string)
	{
		super.setId(string);
	}

	protected boolean altSyntax()
	{
		return ContextUtil.isUseAltSyntax(getStack().getContext());
	}

	protected ValueStack getStack()
	{
		return TagUtils.getStack(pageContext);
	}

	protected String findString(String expr)
	{
		return (String)findValue(expr, java/lang/String);
	}

	protected Object findValue(String expr)
	{
		if (altSyntax() && expr.startsWith("%{") && expr.endsWith("}"))
			expr = expr.substring(2, expr.length() - 1);
		return getStack().findValue(expr);
	}

	protected Object findValue(String expr, Class toType)
	{
		if (altSyntax() && toType == java/lang/String)
			return translateVariables(expr, getStack());
		if (altSyntax() && expr.startsWith("%{") && expr.endsWith("}"))
			expr = expr.substring(2, expr.length() - 1);
		return getStack().findValue(expr, toType);
	}

	protected String toString(Throwable t)
	{
		FastByteArrayOutputStream bout = new FastByteArrayOutputStream();
		PrintWriter wrt = new PrintWriter(bout);
		t.printStackTrace(wrt);
		wrt.close();
		return bout.toString();
	}

	protected String getBody()
	{
		if (bodyContent == null)
			return "";
		else
			return bodyContent.getString().trim();
	}

	public static String translateVariables(String expression, ValueStack stack)
	{
		do
		{
			int x = expression.indexOf("%{");
			int y = expression.indexOf("}", x);
			if (x != -1 && y != -1)
			{
				String var = expression.substring(x + 2, y);
				Object o = stack.findValue(var, java/lang/String);
				if (o != null)
					expression = (new StringBuilder()).append(expression.substring(0, x)).append(o).append(expression.substring(y + 1)).toString();
				else
					expression = (new StringBuilder()).append(expression.substring(0, x)).append(expression.substring(y + 1)).toString();
			} else
			{
				return expression;
			}
		} while (true);
	}
}