public static Boolean isSubElement(FormIndex parent, FormIndex child)
{
while (!parent.isTerminal() && !child.isTerminal())
{
if (parent.getLocalIndex() != child.getLocalIndex())
{
return(false);
}
if (parent.getInstanceIndex() != child.getInstanceIndex())
{
return(false);
}
parent = parent.nextLevel;
child = child.nextLevel;
}
//If we've gotten this far, at least one of the two is terminal
if (!parent.isTerminal() && child.isTerminal())
{
//can't be the parent if the child is earlier on
return(false);
}
else if (parent.getLocalIndex() != child.getLocalIndex())
{
//Either they're at the same level, in which case only
//identical indices should match, or they should have
//the same root
return(false);
}
else if (parent.getInstanceIndex() != -1 && (parent.getInstanceIndex() != child.getInstanceIndex()))
{
return(false);
}
//Barring all of these cases, it should be true.
return(true);
}
public String ToString()
{
String ret = "";
FormIndex ref_ = this;
while (ref_ != null)
{
ret += ref_.getLocalIndex();
ret += ref_.getInstanceIndex() == -1 ? ", " : "_" + ref_.getInstanceIndex() + ", ";
ref_ = ref_.nextLevel;
}
return(ret);
}
/**
* Constructs an index which references an element past the level of
* specificity of the current context, founded by the currentLevel
* index.
* (currentLevel, (nextLevel...))
*/
public FormIndex(FormIndex nextLevel, FormIndex currentLevel)
{
if (currentLevel == null)
{
this.nextLevel = nextLevel.nextLevel;
this.localIndex = nextLevel.localIndex;
this.instanceIndex = nextLevel.instanceIndex;
this.reference = nextLevel.reference;
}
else
{
this.nextLevel = nextLevel;
this.localIndex = currentLevel.getLocalIndex();
this.instanceIndex = currentLevel.getInstanceIndex();
this.reference = currentLevel.reference;
}
}
/**
* Trims any negative indices from the end of the passed in index.
*
* @param index
* @return
*/
public static FormIndex trimNegativeIndices(FormIndex index)
{
if (!index.isTerminal())
{
return(new FormIndex(trimNegativeIndices(index.nextLevel), index));
}
else
{
if (index.getLocalIndex() < 0)
{
return(null);
}
else
{
return(index);
}
}
}
