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package bjc.utils.funcdata.bst;
import java.util.Comparator;
import java.util.function.BiFunction;
import java.util.function.Function;
import java.util.function.Predicate;
import bjc.utils.funcdata.ITreePart;
/**
* A leaf in a tree.
*
* @author ben
*
* @param <T>
* The data stored in the tree.
*/
public class BinarySearchTreeLeaf<T> implements ITreePart<T> {
/**
* The data held in this tree leaf
*/
protected T data;
/**
* Whether this node is soft-deleted or not
*/
protected boolean deleted;
/**
* Create a new leaf holding the specified data.
*
* @param dat
* The data for the leaf to hold.
*/
public BinarySearchTreeLeaf(T dat) {
data = dat;
}
/*
* Can't add things to a leaf. (non-Javadoc)
*
* @see bjc.utils.data.bst.ITreePart#add(java.lang.Object,
* java.util.Comparator)
*/
@Override
public void add(T dat, Comparator<T> comp) {
throw new IllegalArgumentException("Can't add to a leaf.");
}
/*
* Just transform our data. (non-Javadoc)
*
* @see
* bjc.utils.data.bst.ITreePart#collapse(java.util.function.Function,
* java.util.function.BiFunction)
*/
@Override
public <E> E collapse(Function<T, E> f, BiFunction<E, E, E> bf) {
return f.apply(data);
}
/*
* Only check our data. (non-Javadoc)
*
* @see bjc.utils.data.bst.ITreePart#contains(java.lang.Object,
* java.util.Comparator)
*/
@Override
public boolean contains(T dat, Comparator<T> cmp) {
return this.data.equals(dat);
}
/*
* Just get the data (non-Javadoc)
*
* @see bjc.utils.data.bst.ITreePart#data()
*/
@Override
public T data() {
return data;
}
/*
* Just mark ourselves as "not here" (non-Javadoc)
*
* @see bjc.utils.data.bst.ITreePart#delete(java.lang.Object,
* java.util.Comparator)
*/
@Override
public void delete(T dat, Comparator<T> cmp) {
if (data.equals(dat)) {
deleted = true;
}
}
/*
* Just walk our data and only succede if the walk does, because
* there's nowhere left to go. (non-Javadoc)
*
* @see bjc.utils.data.bst.ITreePart#directedWalk(bjc.utils.data.bst.
* DirectedWalkFunction)
*/
@Override
public boolean directedWalk(DirectedWalkFunction<T> ds) {
switch (ds.walk(data)) {
case SUCCESS:
return true;
default:
return false;
}
}
/*
* Just check our data. (non-Javadoc)
*
* @see
* bjc.utils.data.bst.ITreePart#forEach(bjc.utils.data.bst.ITreePart.
* TreeLinearizationMethod, java.util.function.Predicate)
*/
@Override
public boolean forEach(TreeLinearizationMethod tlm, Predicate<T> c) {
return c.test(data);
}
}
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