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。

我想支持具有可在需要时覆盖的基本属性的分层配置。我认为闭包是表示这一点的好方法，但我遇到了一个小问题。

我可以通过将基本闭包左移到子闭包上来将基本键传播到子配置：

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，我得到了我希望的结果：

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'
}

完美！但是，当我尝试覆盖 config 闭包之一中的基本键时，基本闭包中的基本键似乎优先，这不是我所期望的。以下是出处：

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

这是漂亮的打印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'
}

我尝试将移位改为右移位，但我一直收到错误：

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)

现在这一切都可能是由于我对 groovy 闭包的工作原理了解有限，因此我们将不胜感激。

更新：

所以看起来我已经设法通过使用base.clone() 达到我所追求的目标：

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"
}

这正是我所期待的：

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configN 定义之前的整个configN = base.clone() 似乎有点笨拙。有什么办法可以稍微清理一下吗？或者也许使用 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'
}