valuestackshadowmap.java

来自「webwork source」· Java 代码 · 共 41 行

/*
 * WebWork, Web Application Framework
 *
 * Distributable under Apache license.
 * See terms of license at opensource.org
 */
package webwork.view.jasperreports;

import java.util.HashMap;
import java.util.Set;

import webwork.util.ValueStack;

public class ValueStackShadowMap extends HashMap {
	
	Set entries;
	ValueStack valueStack;

	public ValueStackShadowMap(ValueStack valueStack) {
		this.valueStack = valueStack;
	}

	public boolean containsKey(Object key) {
		boolean hasKey = super.containsKey(key);
		if (!hasKey) {
			if (valueStack.findValue((String)key) != null) {
				hasKey = true;
			}
		}
		return hasKey;
	}
	 
	public Object get(Object key) {
		Object value = super.get(key);
		if (value == null && key instanceof String) {
			value = valueStack.findValue((String)key);
		}
		return value;
	}

}