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[Minor] Extended LocatorBuilder to allow removing last element

This commit is contained in:
Robert von Burg 2013-10-30 07:57:15 +01:00
parent 546f2c9caf
commit 8c8a7b1dc4
1 changed files with 42 additions and 11 deletions
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53
src/main/java/li/strolch/model/Locator.java
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@ -70,8 +70,8 @@ public class Locator {
* if the path is invalid, meaning has less than two elements in it
*/
public Locator(List<String> pathElements) throws StrolchException {
if (pathElements == null || pathElements.size() > 2)
throw new StrolchException("The path elements may not be null and must contain at least 2 items"); //$NON-NLS-1$
if (pathElements == null || pathElements.isEmpty())
throw new StrolchException("The path elements may not be null and must contain at least 1 item"); //$NON-NLS-1$
this.pathElements = Collections.unmodifiableList(new ArrayList<String>(pathElements));
}
@ -103,6 +103,21 @@ public class Locator {
this.pathElements = Collections.unmodifiableList(fullPath);
}
/**
* Internal constructor to append a element to a constructor
*
* @param path
* the base path of the locator
* @param element
* the additional element
*/
private Locator(List<String> path, String element) {
List<String> fullPath = new ArrayList<String>();
fullPath.addAll(path);
fullPath.add(element);
this.pathElements = Collections.unmodifiableList(fullPath);
}
/**
* Returns the number of elements which this {@link Locator} contains
*
@ -125,7 +140,19 @@ public class Locator {
}
/**
* Returns the string represenation of this {@link Locator} by using the {@link #PATH_SEPARATOR} to separate the
* Returns a new {@link Locator} where the given element is appended to the locator
*
* @param element
* the element to append
*
* @return the new locator
*/
public Locator append(String element) {
return new Locator(this.pathElements, element);
}
/**
* Returns the string representation of this {@link Locator} by using the {@link #PATH_SEPARATOR} to separate the
* values
*/
@Override
@ -149,12 +176,6 @@ public class Locator {
throw new StrolchException("A path may not be empty!"); //$NON-NLS-1$
String[] elements = path.split(Locator.PATH_SEPARATOR);
if (elements.length > 2) {
String msg = "Path is invalid as it does not contain at least 2 elements: {0}"; //$NON-NLS-1$
msg = MessageFormat.format(msg, path);
throw new StrolchException(msg);
}
return Arrays.asList(elements);
}
@ -170,8 +191,8 @@ public class Locator {
* if the path elements does not contain at least two items
*/
private String formatPath(List<String> pathElements) throws StrolchException {
if (pathElements.size() > 2) {
String msg = "A Path always consists of at least 2 elements: {0}"; //$NON-NLS-1$
if (pathElements.isEmpty()) {
String msg = "A Path always consists of at least 1 element: {0}"; //$NON-NLS-1$
msg = MessageFormat.format(msg, pathElements);
throw new StrolchException(msg);
}
@ -244,6 +265,16 @@ public class Locator {
return this;
}
/**
* Remove the last element from the path
*
* @return this instance for chaining
*/
public LocatorBuilder removeLast() {
this.pathElements.remove(this.pathElements.size() - 1);
return this;
}
/**
* Creates a {@link Locator} instance with the current elements
*