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The Adobe Experience Manager SDK
/*
* Copyright 1997-2010 Day Management AG
* Barfuesserplatz 6, 4001 Basel, Switzerland
* All Rights Reserved.
*
* This software is the confidential and proprietary information of
* Day Management AG, ("Confidential Information"). You shall not
* disclose such Confidential Information and shall use it only in
* accordance with the terms of the license agreement you entered into
* with Day.
*/
package com.day.cq.wcm.foundation;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.apache.commons.lang3.StringEscapeUtils;
import com.day.cq.wcm.api.Page;
import com.day.cq.wcm.api.PageFilter;
import com.day.text.Text;
/**
* Provides a generic utility class that can be used to draw a navigation.
* It specifically does this by providing an iterator over navigation elements.
*
* A navigation element reflects a page and can have different {@link Element.Type}s.
* Note that the same page might be returned 4 times for the different element
* types. this offers maximal flexibility when drawing the navigation.
*/
public class Navigation implements Iterable {
/**
* page filter
*/
private final PageFilter filter;
/**
* navigation depth
*/
private final int depth;
/**
* root page
*/
private final Page root;
/**
* current path
*/
private final String currentPath;
/**
* current path with "/" suffix
*/
private final String currentPathS;
/**
* Creates a new navigation object.
* @param current the current page
* @param absParent the abs level of the navigation root
* @param filter a page filter for filtering the navigation pages
* @param depth navigation depth.
*/
public Navigation(Page current, int absParent, PageFilter filter, int depth) {
currentPath = current.getPath();
currentPathS = currentPath + "/";
Page r = current.getAbsoluteParent(absParent);
root = r == null ? current : r;
this.filter = filter;
this.depth = depth;
}
/**
* Returns an iterator over the navigation elements.
* @return an iterator.
*/
public Iterator iterator() {
List list = new ArrayList();
if (root != null) {
fillList(list, root.listChildren(filter), depth-1);
}
return list.iterator();
}
/**
* Internally fills the list of navigation elements.
* @param list the list to fill
* @param pages current iterator over the pages
* @param limit current recursion limit
*/
private void fillList(List list, Iterator pages, int limit) {
boolean first = true;
while (pages.hasNext()) {
Page p = pages.next();
Element e = new Element(p);
e.first = first;
first = false;
e.last = !pages.hasNext();
String path = p.getPath();
if (path.equals(currentPath)) {
e.current = true;
e.onTrail = true;
} else if (currentPathS.startsWith(path + "/")) {
e.onTrail = true;
}
Iterator cs = null;
if (limit > 0) {
cs = p.listChildren(filter);
}
if (cs != null && cs.hasNext()) {
e.children = true;
}
e.type = Element.Type.ITEM_BEGIN;
list.add(e);
if (e.children) {
list.add(new Element(e, Element.Type.NODE_OPEN));
fillList(list, cs, limit-1);
list.add(new Element(e, Element.Type.NODE_CLOSE));
}
list.add(new Element(e, Element.Type.ITEM_END));
}
}
/**
* Navigation element.
*/
public static class Element {
/**
* Type of the navigation element
*/
public static enum Type {
/**
* Denotes that is element is an open node, e.g. an <UL> tag.
*/
NODE_OPEN,
/**
* Denotes that this element is the beginning of an item, e.g. an <LI> tag.
*/
ITEM_BEGIN,
/**
* Denotes that this element is the end of an item, e.g. an </LI> tag.
*/
ITEM_END,
/**
* Denotes that is element is a closed node, e.g. an </UL> tag.
*/
NODE_CLOSE
}
/**
* element type
*/
private Type type = Type.ITEM_BEGIN;
/**
* underlying page
*/
private final Page page;
/**
* the navigation title
*/
private final String title;
/**
* true if this element has children
*/
private boolean children;
/**
* true if this element is on the trail
*/
private boolean onTrail;
/**
* true if this element is the current one
*/
private boolean current;
/**
* true if this is the first element of it's siblings
*/
private boolean first;
/**
* true if this is the last element of it's siblings
*/
private boolean last;
/**
* Creates a new element based on a given one, but with a different type.
* @param e base element
* @param type new type
*/
private Element(Element e, Type type) {
this.type = type;
page = e.page;
title = e.title;
children = e.children;
onTrail = e.onTrail;
current = e.current;
first = e.first;
last = e.last;
}
/**
* Creates a new element
* @param page the underlying page
*/
private Element(Page page) {
this.page = page;
String t = page.getNavigationTitle();
if (t == null) {
t = page.getTitle();
}
title = t == null ? page.getName() : t;
}
/**
* Returns the element type.
* @return the element type.
*/
public Type getType() {
return type;
}
/**
* Returns the underlying page.
* @return the underlying page.
*/
public Page getPage() {
return page;
}
/**
* Returns the escaped path of the underlying page.
*
* Node that the path is escaped using {@link Text#escape(String, char, boolean)}
*
* @return the escaped path.
*/
public String getPath() {
return Text.escape(page.getPath(), '%', true);
}
/**
* Returns the unescaped navigation title of the underlying page.
* if the page does not specific a navigation title, the title is used
* and ultimately it's name.
*
* @return the navigation title
*
* @see Page#getNavigationTitle()
* @see Page#getTitle()
* @see Page#getName()
*/
public String getRawTitle() {
return title;
}
/**
* Returns the escaped navigation title of the underlying page. if the
* page does not specific a navigation title, the title is used and
* ultimately it's name.
*
* Note that the title is escaped using {@link StringEscapeUtils#escapeHtml4(String)}
*
* @return the navigation title
*
* @see Page#getNavigationTitle()
* @see Page#getTitle()
* @see Page#getName()
*/
public String getTitle() {
return StringEscapeUtils.escapeHtml4(title);
}
/**
* Checks if the this element has children.
*
* Note that this is always true for
* {@link Type#NODE_OPEN} and {@link Type#NODE_CLOSE} elements.
*
* @return true if the current element has children.
*/
public boolean hasChildren() {
return children;
}
/**
* Checks if this element is on the trail. i.e. if the underlying page
* is the same or an ancestor of any degree of the current page, passed
* in the constructor of the navigation object.
*
* @return true if this element is on the trail.
*/
public boolean isOnTrail() {
return onTrail;
}
/**
* Checks if this element is the current one. i.e. if the underlying page
* is the same as current one, passed in the constructor of the navigation
* object.
*
* @return true if this element is the current one.
*/
public boolean isCurrent() {
return current;
}
/**
* Checks if this element is the first of it's siblings.
* @return true if this element is the first of it's siblings.
*/
public boolean isFirst() {
return first;
}
/**
* Checks if this element is the last of it's siblings.
* @return true if this element is the last of it's siblings.
*/
public boolean isLast() {
return last;
}
}
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