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JSP2.1 Jasper implementation from Glassfish
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 * you may not use this file except in compliance with the License.
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package org.apache.jasper.compiler;

import java.util.*;
import javax.servlet.jsp.tagext.*;
import org.apache.jasper.JasperException;

/**
 * Class responsible for determining the scripting variables that every
 * custom action needs to declare.
 *
 * @author Jan Luehe
 */
class ScriptingVariabler {

    private static final Integer MAX_SCOPE = Integer.valueOf(Integer.MAX_VALUE);

    /*
     * Assigns an identifier (of type integer) to every custom tag, in order
     * to help identify, for every custom tag, the scripting variables that it
     * needs to declare.
     */
    static class CustomTagCounter extends Node.Visitor {

	private int count;
	private Node.CustomTag parent;

	public void visit(Node.CustomTag n) throws JasperException {
	    n.setCustomTagParent(parent);
	    Node.CustomTag tmpParent = parent;
	    parent = n;
	    visitBody(n);
	    parent = tmpParent;
	    n.setNumCount(Integer.valueOf(count++));
	}
    }

    /*
     * For every custom tag, determines the scripting variables it needs to
     * declare. 
     */
    static class ScriptingVariableVisitor extends Node.Visitor {

	private ErrorDispatcher err;
	private Hashtable scriptVars;
	
	public ScriptingVariableVisitor(ErrorDispatcher err) {
	    this.err = err;
	    scriptVars = new Hashtable();
	}

	public void visit(Node.CustomTag n) throws JasperException {
	    setScriptingVars(n, VariableInfo.AT_BEGIN);
	    setScriptingVars(n, VariableInfo.NESTED);
	    visitBody(n);
	    setScriptingVars(n, VariableInfo.AT_END);
	}

	private void setScriptingVars(Node.CustomTag n, int scope)
	        throws JasperException {

	    TagVariableInfo[] tagVarInfos = n.getTagVariableInfos();
	    VariableInfo[] varInfos = n.getVariableInfos();
	    if (tagVarInfos.length == 0 && varInfos.length == 0) {
		return;
	    }

	    Vector vec = new Vector();

	    Integer ownRange = null;
	    if (scope == VariableInfo.AT_BEGIN
		    || scope == VariableInfo.AT_END) {
		Node.CustomTag parent = n.getCustomTagParent();
		if (parent == null)
		    ownRange = MAX_SCOPE;
		else
		    ownRange = parent.getNumCount();
	    } else {
		// NESTED
		ownRange = n.getNumCount();
	    }

	    if (varInfos.length > 0) {
		for (int i=0; i 0) {
			scriptVars.put(varName, ownRange);
			vec.add(varInfos[i]);
		    }
		}
	    } else {
		for (int i=0; i 0) {
			scriptVars.put(varName, ownRange);
			vec.add(tagVarInfos[i]);
		    }
		}
	    }

	    n.setScriptingVars(vec, scope);
	}
    }

    public static void set(Node.Nodes page, ErrorDispatcher err)
	    throws JasperException {
	page.visit(new CustomTagCounter());
	page.visit(new ScriptingVariableVisitor(err));
    }
}