/**
* Checks whether the inheritance hierarchy is correct. An incorrect hierarchy is for example a
* loop definition, in which a parent-style extends a child-style:
*
* <pre>
* myStyle extends parent {
* font-face: monospace;
* }
* parent extends grandparent {
* font-size: large;
* font-face: system;
* }
* grandparent extends myStyle {
* background-color: white;
* }
* </pre>
*
* @param style the style whose inheritance hierarchy should be checked.
* @throws BuildException when a circle definition is found.
*/
private void checkInheritanceHierarchy(Style style) {
HashMap<String, Boolean> parentNames = new HashMap<String, Boolean>(5);
// System.out.println("checking inheritance of style " + style.getSelector());
String originalSelector = style.getSelector();
String parentName = style.getParentName();
while (parentName != null) {
// System.out.println( style.getSelector() + " extends " + parentName );
String currentSelector = style.getSelector();
parentName = parentName.toLowerCase();
if (parentNames.get(parentName) == null) {
// okay, this ancestor is not known yet.
parentNames.put(parentName, Boolean.TRUE);
} else {
throw new BuildException(
"Invalid CSS code: Loop in inheritance found: The style ["
+ originalSelector
+ "] extends the child-style ["
+ parentName
+ "]. Please check your extends operator.");
}
style = getStyle(parentName);
if (style == null) {
throw new BuildException(
"Invalid CSS code: The style ["
+ currentSelector
+ "] extends the non-existing style ["
+ parentName
+ "]. Please define the style ["
+ parentName
+ "] or remove the extends operator.");
}
parentName = style.getParentName();
}
}
private void inheritDo(Style style, HashSet<String> set) {
String parentName = style.getParentName();
String currentName = style.getSelector();
if (parentName == null) {
// System.out.println("style [" + currentName + "] no parent.");
return; // No parent.
} else if (set.contains(currentName)) {
// System.out.println("style [" + currentName + "] has been set.");
return; // Has been set
} else {
checkInheritanceHierarchy(style);
Style parent = getStyle(parentName);
// System.out.println("inheriting style [" + currentName + "] from style [" + parentName +
// "].");
if (parent == null) {
throw new BuildException(
"Invalid CSS code: the style ["
+ currentName
+ "] extends the non-existing style ["
+ parentName
+ "].");
}
inheritDo(parent, set);
style.setParent(parent);
set.add(currentName);
}
}
/**
* Sets the parents of the styles. This method is automatically called when the sourcecode will be
* retrieved.
*
* @throws BuildException when invalid inheritances are found.
* @see #isInherited()
* @see #getSourceCode()
*/
public void oldInherit() {
// create default-style when not explicitly defined:
if (this.stylesByName.get("default") == null) {
addCssBlock(DEFAULT_STYLE);
}
Style[] allStyles = getAllStyles();
for (int i = 0; i < allStyles.length; i++) {
Style style = allStyles[i];
// System.out.println("inheriting style [" + style.getSelector() + "].");
checkInheritanceHierarchy(style);
String parentName = style.getParentName();
if (parentName != null) {
Style parent = getStyle(parentName);
if (parent == null) {
throw new BuildException(
"Invalid CSS code: the style ["
+ style.getSelector()
+ "] extends the non-existing style ["
+ parentName
+ "].");
}
style.setParent(parent);
}
}
this.isInitialised = true;
}
