/**
* Returns the PropertyTree associated with the given key. If none exists, creates a new
* PropertyTree associates it with the given key, and returns it.
*
* @param key
* @return PropertyTree associated with the given key
* @throws IllegalArgumentException if the given key is null
*/
private PropertyTree getChild(String key) {
validateKey(key);
PropertyTree child = (PropertyTree) this.children.get(key);
if (child == null) {
child = new PropertyTree((PropertyTree) this);
this.children.put(key, child);
}
return child;
}
/** @see java.util.Map#containsKey(java.lang.Object) */
public boolean containsKey(Object key) {
validateKey(key);
boolean containsKey = false;
Set entrySet = entrySet();
for (Iterator i = entrySet.iterator(); !containsKey && i.hasNext(); ) {
Map.Entry e = (Map.Entry) i.next();
Object entryKey = e.getKey();
containsKey = (entryKey != null) && entryKey.equals(key);
}
return containsKey;
}
/**
* Returns the PropertyTree object with the given key, or null if there is none.
*
* @param key
* @return
* @throws IllegalArgumentException if the key is null
*/
private PropertyTree getSubtree(String key) {
validateKey(key);
PropertyTree returnValue = null;
if (StringUtils.contains(key, '.')) {
String prefix = StringUtils.substringBefore(key, ".");
String suffix = StringUtils.substringAfter(key, ".");
PropertyTree child = (PropertyTree) this.children.get(prefix);
if (child != null) {
returnValue = child.getSubtree(suffix);
}
} else {
returnValue = (PropertyTree) this.children.get(key);
}
return returnValue;
}
/**
* Associates the given key with the given value. If the given key has multiple levels (consists
* of multiple strings separated by '.'), the property value is stored such that it can be
* retrieved either directly, by calling get() and passing the entire key; or indirectly, by
* decomposing the key into its separate levels and calling get() successively on the result of
* the previous level's get. <br>
* For example, given <br>
* <code>
* PropertyTree tree = new PropertyTree();
* tree.set( "a.b.c", "something" );
* </code> the following statements are equivalent ways to retrieve the value: <br>
* <code>
* Object one = tree.get( "a.b.c" );
* </code> <code>
* Object two = tree.get( "a" ).get( "b" ).get( "c" );
* </code><br>
* Note: since I can't have the get method return both a PropertyTree and a String, getting an
* actual String requires calling toString on the PropertyTree returned by get.
*
* @param key
* @param value
* @throws IllegalArgumentException if the key is null
* @throws IllegalArgumentException if the value is null
*/
public void setProperty(String key, String value) {
validateKey(key);
validateValue(value);
if (parent == null) {
LOG.debug("setting (k,v) (" + key + "," + value + ")");
}
if (StringUtils.contains(key, '.')) {
String prefix = StringUtils.substringBefore(key, ".");
String suffix = StringUtils.substringAfter(key, ".");
PropertyTree node = getChild(prefix);
node.setProperty(suffix, value);
} else {
PropertyTree node = getChild(key);
node.setDirectValue(value);
}
}
/**
* Traverses the tree structure until it finds the PropertyTree pointed to by the given key, and
* returns that PropertyTree instance.
*
* <p>Only returns PropertyTree instances; if you want the String value pointed to by a given key,
* you must call toString() on the returned PropertyTree (after verifying that it isn't null, of
* course).
*
* @see java.util.Map#get(java.lang.Object)
*/
public Object get(Object key) {
validateKey(key);
return getSubtree((String) key);
}
