/* ZkInfo.java

	Purpose:
		
	Description:
		
	History:
		Fri May 30 19:13:58     2008, Created by tomyeh

Copyright (C) 2008 Potix Corporation. All Rights Reserved.

{{IS_RIGHT
	This program is distributed under LGPL Version 2.1 in the hope that
	it will be useful, but WITHOUT ANY WARRANTY.
}}IS_RIGHT
*/
package org.zkoss.zk.ui.metainfo;

import org.zkoss.zk.ui.Component;
import org.zkoss.zk.ui.Page;
import org.zkoss.zk.ui.util.ConditionImpl;
import org.zkoss.zk.xel.ExValue;
import org.zkoss.zk.xel.impl.Utils;

/**
 * Represents the zk element in a ZUML page.
 *
 * @author tomyeh
 * @since 3.5.0
 */
public class ZkInfo extends ForEachBranchInfo {
	/** The switch condition. */
	private ExValue _switch;
	/** The case condition. */
	private ExValue[] _case;

	/** Constructs a ZK info.
	 */
	public ZkInfo(NodeInfo parent, ConditionImpl cond) {
		super(parent, cond);
	}

	/** Returns whether the switch condition is defined.
	 */
	public boolean withSwitch() {
		return _switch != null;
	}

	/** Sets the switch condition.
	 * @param switchc the switch condition; EL allowed.
	 * Ignored if null.
	 * Note: if it is an empty string, the switch condition
	 * (returned by {@link #resolveSwitch}) is an empty string.
	 */
	public void setSwitch(String switchc) {
		if (_case != null && switchc != null)
			throw new IllegalStateException("case and switch/choose cannot coexist");
		_switch = switchc != null ? new ExValue(switchc, Object.class) : null;
	}

	/** Returns the switch condition's value; evaluate EL expression if any.
	 * <p>Note: unlike {@link #resolveCase}, it might return null
	 * even if {@link #withSwitch} is true.
	 */
	public Object resolveSwitch(Page page, Component comp) {
		return _switch == null ? null : comp != null ? _switch.getValue(_evalr, comp) : _switch.getValue(_evalr, page);
	}

	/** Returns whether the case condition is defined.
	 */
	public boolean withCase() {
		return _case != null;
	}

	/** Sets the case condition.
	 */
	public void setCase(String casec) {
		if (_switch != null && casec != null)
			throw new IllegalStateException("case and switch/choose cannot coexist");
		_case = Utils.parseList(casec, Object.class, false);
	}

	/** Returns the case condition's value, or null if no case is
	 * specified (i.e., {@link #withCase} is false.
	 * It evaluates EL expression if any.
	 */
	public Object[] resolveCase(Page page, Component comp) {
		if (_case == null)
			return null;

		Object[] ary = new Object[_case.length];
		for (int j = 0; j < _case.length; ++j)
			ary[j] = comp != null ? _case[j].getValue(_evalr, comp) : _case[j].getValue(_evalr, page);
		return ary;
	}

	//Object//
	public String toString() {
		return "[ZkInfo@" + System.identityHashCode(this) + ']';
	}
}