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The JSP tags for encapsulating ZK XUL components
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/* Utils.java

{{IS_NOTE
	Purpose:
		
	Description:
		
	History:
		Fri Jul 20 19:30:17     2007, Created by tomyeh
}}IS_NOTE

Copyright (C) 2007 Potix Corporation. All Rights Reserved.

{{IS_RIGHT
	This program is distributed under GPL Version 2.0 in the hope that
	it will be useful, but WITHOUT ANY WARRANTY.
}}IS_RIGHT
*/
package org.zkoss.jsp.zul.impl;

import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.ArrayList;
import java.util.Map;
import java.io.Writer;
import java.io.IOException;

import org.zkoss.lang.Objects;

import org.zkoss.zk.ui.Page;
import org.zkoss.zk.ui.Component;
import org.zkoss.zk.ui.metainfo.ZScript;
import org.zkoss.zk.ui.sys.PageCtrl;

/**
 * A utility to be shared by {@link BranchTag} and {@link RootTag} to
 * implement the capability to hold a list of children.
 *
 * @author tomyeh
 */
/*package*/ class Utils {
	private static final String MARK_PREFIX = "= 0) {
				int l = k + MARK_PREFIX.length();
				int m = body.indexOf(MARK_POSTFIX, l);
				if (m <= l) { //not found or empty uuid
					k = -1;
				} else {
					txt = body.substring(j, k).trim();
					child = matchNext(it, body.substring(l, m));
					k = m + MARK_POSTFIX.length();
				}
			}
			if (k < 0)
				txt = body.substring(j).trim();
			//inline handle...
			if (txt.length() > 0) {
				final Inline inl = ZkProxy.getProxy().newInline(txt);
				if (child != null) {
					if (parent != null)
						parent.insertBefore(inl, child);
					else
						inl.setPageBefore(page, child);
				} else {
					if (parent != null)
						parent.appendChild(inl);
					else
						inl.setPage(page);
				}
			}

			if (k < 0) break; //no more
			j = k;
		}

//		while (it.hasNext())
//			((Component)it.next()).detach();
	}
	/** Matches the next component with the specified uuid,
	 * returns null if no match at all.
	 * Note: if it.next().getUuid() is not uuid, it will be removed.
	 */
	private static Component matchNext(Iterator it, String uuid) {
		while (it.hasNext()) {
			final Component child = (Component)it.next();
			if (Objects.equals(uuid, child.getUuid()))
				return child; //found
			// child.detach(); //remove it
			// Note: it assumes it has the full set and they are
			// in the same order
		}
		return null;
	}
	/** Writes a special mark to the output to represent the component
	 * of the specified child.
	 * The mark is then used by {@link #adjustChildren}
	 */
	/*package*/ static void writeComponentMark(Writer out, Component comp)
	throws IOException {
		out.write(MARK_PREFIX);
		out.write(comp.getUuid());
		out.write(MARK_POSTFIX);
	}
	

}