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Copy pathContextStack.java
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67 lines (52 loc) · 1.16 KB
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package jtree.util;
import java.util.Stack;
import java.util.function.Supplier;
public final class ContextStack<T> implements ContextManager {
private Stack<T> stack = new Stack<>();
public ContextStack() {}
public ContextStack(T initialElement) {
stack.push(initialElement);
}
public boolean isEmpty() {
return stack.isEmpty();
}
public int size() {
return stack.size();
}
public T get(int index) {
return stack.get(index);
}
public T current() {
return stack.peek();
}
public T currentOrElse(T defaultValue) {
if(stack.isEmpty()) {
return defaultValue;
} else {
return stack.peek();
}
}
public T currentOrElseGet(Supplier<? extends T> defaultValueSupplier) {
if(stack.isEmpty()) {
return defaultValueSupplier.get();
} else {
return stack.peek();
}
}
public ContextStack<T> enter(T element) {
stack.push(element);
return this;
}
@Override
public void exit() {
stack.pop();
}
@Override
public String toString() {
return stack.toString();
}
@Override
public boolean equals(Object obj) {
return obj instanceof ContextStack && stack.equals(((ContextStack<?>)obj).stack) || stack.equals(obj);
}
}