用另一个闭包扩展闭包

Question

我正在尝试使用ConfigSlurper来解析将用作Java程序配置文件的Groovy文件。

我希望支持具有基本属性的层次化配置，如果需要，可以重写这些属性。我认为闭包是一个很好的表示方法，但我遇到了一个小问题。

通过将基闭包左移到子闭包上，我可以获得要传播到子配置的基键：

base {
    baseKey = "All closures that compose from this closure will have this key"
}

config1 {
    config1only = "value"
}
config1 << base

config2 {
    config2only = "another value"
}
config2 << base

当我漂亮地打印ConfigObject时，我得到了我所希望的：

base.baseKey='All closures that compose from this closure will have this key'
config1 {
    config1only='value'
    baseKey='All closures that compose from this closure will have this key'
}
config2 {
    config2only='another value'
    baseKey='All closures that compose from this closure will have this key'
}

太棒了！但是，当我试图覆盖一个config闭包中的基键时，基闭包中的基键似乎是优先的，这不是我所期望的。这是消息来源：

base {
    baseKey = "All closures that compose from this closure will have this key"
    overiddenKey = "base"
}

config1 {
    config1only = "value"
    overiddenKey = "override1"
}
config1 << base

config2 {
    config2only = "another value"
    overiddenKey = "override2"
}
config2 << base

以下是印刷精美的ConfigObject：

base {
    baseKey='All closures that compose from this closure will have this key'
    overiddenKey='base'
}
config1 {
    config1only='value'
    overiddenKey='base'
    baseKey='All closures that compose from this closure will have this key'
}
config2 {
    config2only='another value'
    overiddenKey='base'
    baseKey='All closures that compose from this closure will have this key'
}

我试着把换班改为右班，但一直有个错误：

Exception in thread "main" groovy.lang.MissingMethodException: No signature of method: groovy.util.ConfigObject.leftShift() is applicable for argument types: (script15162997138121381677545$_run_closure1) values: [script15162997138121381677545$_run_closure1@3d246ea3]
Possible solutions: leftShift(java.util.Map), leftShift(java.util.Map$Entry)
    at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.unwrap(ScriptBytecodeAdapter.java:58)
    at org.codehaus.groovy.runtime.callsite.PogoMetaClassSite.call(PogoMetaClassSite.java:54)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:48)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:113)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:125)
    at script15162997138121381677545.run(script15162997138121381677545.groovy:18)

这可能是因为我对groovy闭包的理解有限，所以希望能提供任何帮助。

更新：

所以看起来我已经通过使用base.clone()实现了我的目标

base {
    baseKey = "All closures that compose from this closure will have this key"
    overiddenKey = "base"
}

config1 = base.clone()
config1 {
    config1only = "value"
}

config2 = base.clone()
config2 {
    config2only = "another value"
    overiddenKey = "override2"
}

这正好产生了我预期的结果：

base {
    baseKey='All closures that compose from this closure will have this key'
    overiddenKey='base'
}
config1 {
    baseKey='All closures that compose from this closure will have this key'
    overiddenKey='base'
    config1only='value'
}
config2 {
    baseKey='All closures that compose from this closure will have this key'
    overiddenKey='override2'
    config2only='another value'
}

但是，在configN = base.clone()定义之前的整个configN似乎有点笨拙。有什么办法我能把它弄干净一点吗？还是使用groovy不是最好的选择？

Answer 1

这是你想要的吗？

输入：

base {
    baseKey = "All closures that compose from this closure will have this key"
    overiddenKey = "base"
}

config1 << base
config1 {
    config1only = "value"
    overiddenKey = "override1"
}
config2 << base
config2 {
    config2only = "another value"
    overiddenKey = "override2"
}

输出：

base {
    baseKey='All closures that compose from this closure will have this key'
    overiddenKey='base'
}
config1 {
    baseKey='All closures that compose from this closure will have this     key'
    overiddenKey='override1'
    config1only='value'
}
config2 {
    baseKey='All closures that compose from this closure will have this key'
    overiddenKey='override2'
    config2only='another value'
}