结合JSF源码类NavigationHandlerImpl重构视图跳转

背景前提

以下参考JSF源码类NavigationHandlerImpl

源码分析: 源码分析JSF画面跳转下一个画面流程，关联faces-config.xml

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配合Jsoup获取caseListMap 和wildCardSet 的使用：使用Jsonup解析JSF「faces-config.xml」画面跳转标签＜navigation-rule＞

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调用NavigationHandlerImplhandleNavigation方法获取跳转视图路径

	outcome = ((MethodInvocation)node.getExpression()).arguments().get(2).toString().replace("\"", "");
	CaseStruct caseStruct = NavigationHandlerImpl.handleNavigation(node, packageName, className, outcome);
	if (caseStruct != null) {
		assert (null != caseStruct);
		viewId = caseStruct.viewId;
	}

1.NavigationHandlerImpl

1.1初始化

	private static Map<String, List<ConfigNavigationCase>> caseListMap = CommonConst.CASE_LIST_MAP;
	private static Set<String> wildCardSet = CommonConst.WILD_CARD_SET;
	private static boolean navigationConfigured = (wildCardSet != null && caseListMap != null);

1.2获取跳转下一个画面视图路径，Method「handleNavigation」

    public static CaseStruct handleNavigation(ASTNode node, String packageName, String className, String outcome) {
    	MethodDeclaration md = CommonUtils.findMethodDeclaration(node);
		String viewId = "";
		String[] split = packageName.split("\\.");
		if(split.length == 0) {
			viewId = "/" + className.replace(".java", "");
		}else {
			viewId = packageName.substring(packageName.indexOf(".")).replace(".", "/");
			viewId = viewId + "/" + className.replace(".java", "");
		}
		String fromAction = md.getName().getFullyQualifiedName();
		
		CaseStruct caseStruct = null;
		if (viewId != null) {
			caseStruct = NavigationHandlerImpl.findExactMatch(viewId, fromAction, outcome);
			
            if (caseStruct == null) {
                caseStruct = findWildCardMatch(viewId, fromAction, outcome);
            }
		}
		
        if (caseStruct == null) {
            caseStruct = NavigationHandlerImpl.findDefaultMatch(fromAction, outcome);
        }
		return caseStruct;
    }

1.3在caseListMap查询根节点viewId，Method「findExactMatch」

    private CaseStruct findExactMatch(String viewId,
                                      String fromAction,
                                      String outcome) {

        if (!navigationConfigured) {
            return null;
        }
        List<ConfigNavigationCase> caseList = caseListMap.get(viewId);

        if (caseList == null) {
            return null;
        }
        //匹配fromAction和outcome，并返回faces-config.xml结果
        return determineViewFromActionOutcome(caseList, fromAction, outcome);
    }

1.4在wildCardSet中查询fromViewId标签值以「*」结尾，Method「findWildCardMatch」

    private CaseStruct findWildCardMatch(String viewId,
                                         String fromAction,
                                         String outcome) {
        CaseStruct result = null;
        if (!navigationConfigured) {
            return null;
        }

        for (String fromViewId : wildCardSet) {

            if (!viewId.startsWith(fromViewId)) {
                continue;
            }
            String wcFromViewId = new StringBuilder(32).append(fromViewId).append('*').toString();
            List<ConfigNavigationCase> caseList = caseListMap.get(wcFromViewId);

            if (caseList == null) {
                return null;
            }
            //匹配fromAction和outcome，并返回faces-config.xml结果
            result = determineViewFromActionOutcome(caseList, fromAction, outcome);
            if (result != null) {
                break;
            }
        }
        return result;
    }

1.5在caseListMap查询key为「*」，Method「findDefaultMatch」

    private CaseStruct findDefaultMatch(String fromAction,
                                        String outcome) {
        if (!navigationConfigured) {
            return null;
        }
        List<ConfigNavigationCase> caseList = caseListMap.get("*");

        if (caseList == null) {
            return null;
        }
        //匹配fromAction和outcome，并返回faces-config.xml结果
        return determineViewFromActionOutcome(caseList, fromAction, outcome);
    }

1.6匹配fromAction和outcome，并返回faces-config.xml结果

    private CaseStruct determineViewFromActionOutcome(List<ConfigNavigationCase> caseList,
                                                      String fromAction,
                                                      String outcome) {
		//遍历List<ConfigNavigationCase>
		//相当于遍历<navigation-case>标签
        CaseStruct result = new CaseStruct();
        for (ConfigNavigationCase cnc : caseList) {
            String cncFromAction = cnc.getFromAction();
            String fromOutcome = cnc.getFromOutcome();
            String toViewId = cnc.getToViewId();
            //<from-action>#{rc_Login.CloseAction}</from-action>不等于空
            //<from-outcome>CLOSE</from-outcome>不等于空
            if ((cncFromAction != null) && (fromOutcome != null)) {
            	//匹配当前Action接口和跳转key必须相等
                if ((cncFromAction.equals(fromAction)) &&
                    (fromOutcome.equals(outcome))) {
                    result.viewId = toViewId;
                    result.navCase = cnc;
                    return result;
                }
            }
			//<from-action></from-action>等于空
			//<from-outcome>HomePage</from-outcome>不等于空
             if ((cncFromAction == null) && (fromOutcome != null)) {
                if (fromOutcome.equals(outcome)) {
                    result.viewId = toViewId;
                    result.navCase = cnc;
                    return result;
                }
            }
            //<from-action>#{rc_Login.CloseAction}</from-action>不等于空
            //<from-outcome></from-outcome>等于空
            if ((cncFromAction != null) && (fromOutcome == null)) {
            	//匹配当前Action接口相等
                if (cncFromAction.equals(fromAction)) {
                    result.viewId = toViewId;
                    result.navCase = cnc;
                    return result;
                }
            }
			 //<from-action></from-action>等于空
            //<from-outcome></from-outcome>等于空
            if ((cncFromAction == null) && (fromOutcome == null)) {
                result.viewId = toViewId;
                result.navCase = cnc;
                return result;
            }
        }
        return null;
    }

2.ConfigNavigationCase类 存放fromViewId和navigation-case标签中子标签值

public class ConfigNavigationCase {
    private String fromViewId = null;
    private String fromAction = null;
    private String fromOutcome = null;
    private String toViewId = null;
    private String key = null;
    private boolean redirect;
    public ConfigNavigationCase(String fromViewId,
                                String fromAction,
                                String fromOutcome,
                                String toViewId,
                                boolean redirect) {
        this.fromViewId = fromViewId;
        this.fromAction = fromAction;
        this.fromOutcome = fromOutcome;
        this.toViewId = toViewId;
        this.key = fromViewId
                   + ((fromAction == null) ? "-" : fromAction)
                   + ((fromOutcome == null) ? "-" : fromOutcome);
        this.redirect = redirect;
    }
    public String getFromViewId() {
        return (this.fromViewId);
    }
    public void setFromViewId(String fromViewId) {
        this.fromViewId = fromViewId;
    }
    public String getFromAction() {
        return (this.fromAction);
    }
    public void setFromAction(String fromAction) {
        this.fromAction = fromAction;
    }
    public String getFromOutcome() {
        return (this.fromOutcome);
    }
    public void setFromOutcome(String fromOutcome) {
        this.fromOutcome = fromOutcome;
    }
    public String getToViewId() {
        return (this.toViewId);
    }
    public void setToViewId(String toViewId) {
        this.toViewId = toViewId;
    }
    public boolean hasRedirect() {
        return redirect;
    }
    public void setRedirect(boolean redirect) {
        this.redirect = redirect;
    }
    /**
     * The "key" is defined as the combination of
     * <code>from-view-id</code><code>from-action</code>
     * <code>from-outcome</code>.
     * @return the derived key
     */
    public String getKey() {
        return key;
    }
    public void setKey(String key) {
        this.key = key;
    }
    public String toString() {
        StringBuilder sb = new StringBuilder(64);
        sb.append("from-view-id=").append(getFromViewId());
        sb.append(" from-action=").append(getFromAction());
        sb.append(" from-outcome=").append(getFromOutcome());
        sb.append(" to-view-id=").append(getToViewId());
        sb.append(" redirect=").append(hasRedirect());
        return sb.toString();
    }
}

3.CaseStruct类 存储跳转画面key和action接口与faces-config.xml进行匹配后，存放对象

public class CaseStruct {
    public String viewId;
    public ConfigNavigationCase navCase;
}