net.sourceforge.pmd.lang.modelica.resolver.CompositeName Maven / Gradle / Ivy
/**
* BSD-style license; for more info see http://pmd.sourceforge.net/license.html
*/
package net.sourceforge.pmd.lang.modelica.resolver;
/**
* An immutable composite name representation for use in "pattern matching style".
*
* Supports lightweight splitting into first element and "tail" (everything else).
*/
public final class CompositeName {
private static final CompositeName NIL = new CompositeName(null, null);
static final String ROOT_PSEUDO_NAME = "";
public static final String NAME_COMPONENT_SEPARATOR = ".";
private String head;
private CompositeName tail;
private CompositeName(String head, CompositeName tail) {
this.head = head;
this.tail = tail;
}
private static CompositeName create(String[] components, int startIndex, int total, boolean isAbsolute) {
if (isAbsolute) {
return new CompositeName(ROOT_PSEUDO_NAME, create(components, startIndex, total, false));
} else if (startIndex == total) {
return NIL;
} else {
return new CompositeName(components[startIndex], create(components, startIndex + 1, total, false));
}
}
public static CompositeName create(boolean isAbsolute, String[] components) {
return create(components, 0, components.length, isAbsolute);
}
public static CompositeName create(boolean isAbsolute, String[] components, int prefixLength) {
return create(components, 0, prefixLength, isAbsolute);
}
public static CompositeName create(String simpleName) {
return new CompositeName(simpleName, NIL);
}
public boolean isEmpty() {
return head == null;
}
public String getHead() {
return head;
}
public CompositeName getTail() {
return tail;
}
private CompositeName matchPrefix(String[] prefix, int currentIndex) {
if (currentIndex == prefix.length) {
return this;
} else if (prefix[currentIndex].equals(head) && tail != null) {
return tail.matchPrefix(prefix, currentIndex + 1);
} else {
return null;
}
}
/**
* Tries to match the prefix argument with the first elements of this name
*
* @return the remaining elements on success or null on failure
*/
public CompositeName matchPrefix(String[] prefix) {
return matchPrefix(prefix, 0);
}
@Override
public String toString() {
if (isEmpty()) {
return "Nil";
} else {
return head + "::" + tail.toString();
}
}
}