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/* VariablesInfo.java
Purpose:
Description:
History:
Wed Feb 28 19:19:49 2007, Created by tomyeh
Copyright (C) 2007 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 java.util.Map;
import java.util.LinkedHashMap;
import org.zkoss.zk.ui.Page;
import org.zkoss.zk.ui.Component;
import org.zkoss.zk.ui.util.ConditionImpl;
import org.zkoss.zk.xel.Evaluator;
import org.zkoss.zk.xel.impl.Utils;
/**
* The information about the variables element in the ZUML page.
*
* @author tomyeh
*/
public class VariablesInfo extends ConditionLeafInfo {
/** Map(String name, ExValue/ExValue[]/Map value). */
private final Map _vars;
private final int _composite;
private final boolean _local;
/** Constructor.
* @param vars a map of (String name, String value).
* Note: once called, the caller cannot access it any more.
* In other words, it becomes part of this object.
* @param local whether they are local variables.
* @param composite indicates the composite type.
* It can be one of "none", "list" or "map".
* If null or empty, "none" is assumed.
* @exception IllegalArgumentException if the composite type is illegal.
* @since 3.0.6
*/
public VariablesInfo(NodeInfo parent, Map vars, boolean local,
String composite, ConditionImpl cond) {
super(parent, cond);
if (composite == null || composite.length() == 0
|| composite.equals("none"))
_composite = Utils.SCALAR;
else if (composite.equals("list"))
_composite = Utils.LIST;
else if (composite.equals("map"))
_composite = Utils.MAP;
else
throw new IllegalArgumentException("Unkonwn composite: "+composite);
if (vars != null) {
_vars = new LinkedHashMap();
for (Map.Entry me: vars.entrySet()) {
_vars.put(me.getKey(),
Utils.parseComposite(me.getValue(), Object.class, _composite));
}
} else {
_vars = null;
}
_local = local;
}
/** The same as VariablesInfo(parent, vars, locale, "none", cond).
* @param vars a map of (String name, String value).
* Note: once called, the caller cannot access it any more.
* In other words, it becomes part of this object.
* @param local whether they are local variables.
*/
public VariablesInfo(NodeInfo parent, Map vars, boolean local,
ConditionImpl cond) {
this(parent, vars, local, null, cond);
}
/** Returns if it is for local variable.
* @since 3.0.6
*/
public boolean isLocal() {
return _local;
}
/** Returns the composite type: "none", "list" or "map".
* @since 3.0.6
*/
public String getComposite() {
return _composite == Utils.LIST ? "list":
_composite == Utils.MAP ? "map": "none";
}
/** Applies the variable element against the parent component.
*
* @param comp the parent component (it cannot be null)
*/
public void apply(Component comp) {
if (_vars != null && isEffective(comp)) {
final Evaluator eval = getEvaluator();
for (Map.Entry me: _vars.entrySet()) {
final String name = me.getKey();
final Object value = me.getValue();
comp.getSpaceOwner().setAttribute(
name, Utils.evaluateComposite(eval, comp, value), !_local);
}
}
}
/** Applies the variable element against the page.
* It is called if the element doesn't belong to any component.
*/
public void apply(Page page) {
if (_vars != null && isEffective(page)) {
final Evaluator eval = getEvaluator();
for (Map.Entry me: _vars.entrySet()) {
final String name = me.getKey();
final Object value = me.getValue();
page.setAttribute(
name, Utils.evaluateComposite(eval, page, value), !_local);
}
}
}
//Object//
public String toString() {
final StringBuffer sb = new StringBuffer(40).append("[variables:");
if (_vars != null)
for (String name: _vars.keySet())
sb.append(' ').append(name);
return sb.append(']').toString();
}
}
