package com.psddev.cms.db;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.BodyTagSupport;
import javax.servlet.jsp.tagext.DynamicAttributes;
import javax.servlet.jsp.tagext.TryCatchFinally;
import com.psddev.dari.util.HtmlGrid;
import com.psddev.dari.util.HtmlObject;
import com.psddev.dari.util.HtmlWriter;
import com.psddev.dari.util.ObjectUtils;
import com.psddev.dari.util.TypeReference;
public class LayoutTag extends BodyTagSupport implements DynamicAttributes, TryCatchFinally {
private static final long serialVersionUID = 1L;
private static final String ATTRIBUTE_PREFIX = LayoutTag.class.getName() + ".";
private static final String GRID_CSS_WRITTEN_ATTRIBUTE = ATTRIBUTE_PREFIX + "gridCssWritten";
private static final String GRID_CSS_CLASS_WRITTEN_ATTRIBUTE_PREFIX = ATTRIBUTE_PREFIX + "gridCssClassWritten.";
private static final String GRID_CSS_COMMON_WRITTEN_ATTRIBUTE = ATTRIBUTE_PREFIX + "gridCssCommonWritten";
private static final String GRID_JAVASCRIPT_WRITTEN_ATTRIBUTE = ATTRIBUTE_PREFIX + "gridJavaScriptWritten";
private static final String GRIDS_ATTRIBUTE = ATTRIBUTE_PREFIX + "grids";
private final Map<String, Object> attributes = new LinkedHashMap<String, Object>();
private transient HtmlWriter writer;
private transient List<CssClassHtmlGrid> cssGrids;
private transient List<String> cssClasses;
private transient String extraCss;
private transient Map<String, Object> areas;
public Map<String, Object> getAreas() {
return areas;
}
// --- DynamicAttributes support ---
@Override
public void setDynamicAttribute(String uri, String localName, Object value) {
if (value != null) {
attributes.put(localName, value);
}
}
// --- TryCatchFinally support ---
@Override
public void doCatch(Throwable error) throws Throwable {
throw error;
}
@Override
public void doFinally() {
attributes.clear();
writer = null;
cssGrids = null;
cssClasses = null;
extraCss = null;
areas = null;
}
// --- TagSupport support ---
protected HtmlGrid getGrid(HttpServletRequest request, Object area) {
if (area instanceof Integer) {
int areaInt = (Integer) area;
int gridOffset = 0;
for (CssClassHtmlGrid entry : cssGrids) {
HtmlGrid grid = entry.grid;
int gridAreaSize = entry.grid.getAreas().size();
if (areaInt < gridOffset + gridAreaSize) {
return grid;
} else {
gridOffset += gridAreaSize;
}
}
} else if (cssGrids != null && !cssGrids.isEmpty()) {
return cssGrids.iterator().next().grid;
}
return null;
}
public Object getAreaName(HttpServletRequest request, Object area) {
if (area instanceof Integer) {
int areaInt = (Integer) area;
int gridOffset = 0;
for (CssClassHtmlGrid entry : cssGrids) {
int gridAreaSize = entry.grid.getAreas().size();
if (areaInt < gridOffset + gridAreaSize) {
return areaInt - gridOffset;
} else {
gridOffset += gridAreaSize;
}
}
}
return area;
}
@Override
public int doStartTag() throws JspException {
ServletContext context = pageContext.getServletContext();
HttpServletRequest request = (HttpServletRequest) pageContext.getRequest();
try {
writer = new HtmlWriter(pageContext.getOut());
cssGrids = new ArrayList<CssClassHtmlGrid>();
cssClasses = ObjectUtils.to(new TypeReference<List<String>>() { }, attributes.remove("class"));
Set<String> gridCssClasses = new HashSet<String>();
extraCss = ObjectUtils.to(String.class, attributes.remove("extraClass"));
if (cssClasses != null) {
for (Object cssClassObject : cssClasses) {
if (cssClassObject != null) {
String cssClassString = cssClassObject.toString();
for (String cssClass : cssClassString.split(" ")) {
cssClass = cssClass.trim();
@SuppressWarnings("unchecked")
Map<String, HtmlGrid> grids = (Map<String, HtmlGrid>) request.getAttribute(GRIDS_ATTRIBUTE);
if (grids == null) {
grids = HtmlGrid.Static.findAll(context, request);
request.setAttribute(GRIDS_ATTRIBUTE, grids);
}
HtmlGrid grid = grids.get("." + cssClass);
if (grid != null) {
cssGrids.add(new CssClassHtmlGrid(cssClassString, grid));
gridCssClasses.add(cssClass);
}
}
}
}
}
if (cssGrids.isEmpty()) {
areas = null;
writer.writeStart("div",
attributes,
"class", cssClasses != null && !cssClasses.isEmpty() ?
cssClasses.get(0) + " " + extraCss :
extraCss);
} else {
areas = new LinkedHashMap<String, Object>();
LayoutTag.Static.writeGridCssByClasses(writer, context, request, gridCssClasses);
LayoutTag.Static.writeGridJavaScript(writer, context, request);
}
} catch (IOException error) {
throw new JspException(error);
}
return areas != null ? EVAL_BODY_BUFFERED : EVAL_BODY_INCLUDE;
}
@Override
public int doEndTag() throws JspException {
try {
if (cssGrids.isEmpty()) {
writer.writeEnd();
} else {
List<Object> areasList = new ArrayList<Object>(areas.values());
int areaSize = areasList.size();
int gridOffset = 0;
for (CssClassHtmlGrid cssGrid : cssGrids) {
String cssClass = cssGrid.cssClass;
HtmlGrid grid = cssGrid.grid;
Map<String, GridItem> items = new LinkedHashMap<String, GridItem>();
int gridAreaSize = grid.getAreas().size();
for (Map.Entry<String, Object> areaEntry : areas.entrySet()) {
items.put(areaEntry.getKey(), new GridItem(areaEntry.getValue()));
}
int i = 0;
for (; i < gridAreaSize && gridOffset + i < areaSize; ++ i) {
items.put(String.valueOf(i), new GridItem(areasList.get(gridOffset + i)));
}
for (; i < gridAreaSize; ++ i) {
items.put(String.valueOf(i), null);
}
gridOffset += gridAreaSize;
if (extraCss != null) {
cssClass += " " + extraCss;
}
writer.writeStart("div", attributes, "class", cssClass);
writer.writeGrid(items, grid);
writer.writeEnd();
}
}
} catch (IOException error) {
throw new JspException(error);
}
return EVAL_PAGE;
}
/** {@link LayoutTag} utility methods. */
public static final class Static {
private Static() {
}
/**
* Writes all grid CSS found in the given {@code context} to the
* given {@code writer} unless it's already been written within the
* given {@code request}.
*
* @param writer Can't be {@code null}.
* @param context Can't be {@code null}.
* @param request Can't be {@code null}.
*/
public static void writeGridCss(HtmlWriter writer, ServletContext context, HttpServletRequest request) throws IOException {
if (request.getAttribute(GRID_CSS_WRITTEN_ATTRIBUTE) == null) {
writer.writeStart("style", "type", "text/css");
writer.writeAllGridCss(context, request);
writer.writeEnd();
request.setAttribute(GRID_CSS_WRITTEN_ATTRIBUTE, Boolean.TRUE);
}
}
/**
* Writes all grid CSS related to the given {@code cssClasses found
* in the given {@code context} to the given {@code writer} unless
* it's already been written within the given {@code request}.
*
* @param writer Can't be {@code null}.
* @param context Can't be {@code null}.
* @param request Can't be {@code null}.
* @param cssClasses May be {@code null}.
*/
public static void writeGridCssByClasses(
HtmlWriter writer,
ServletContext context,
HttpServletRequest request,
Collection<String> cssClasses)
throws IOException {
if (request.getAttribute(GRID_CSS_WRITTEN_ATTRIBUTE) != null) {
return;
}
boolean styleStarted = false;
if (request.getAttribute(GRID_CSS_COMMON_WRITTEN_ATTRIBUTE) == null) {
request.setAttribute(GRID_CSS_COMMON_WRITTEN_ATTRIBUTE, Boolean.TRUE);
if (!styleStarted) {
styleStarted = true;
writer.writeStart("style", "type", "text/css");
}
writer.writeCommonGridCss();
}
if (cssClasses != null) {
Map<String, HtmlGrid> grids = HtmlGrid.Static.findAll(context, request);
for (String cssClass : cssClasses) {
for (Map.Entry<String, HtmlGrid> entry : grids.entrySet()) {
String selector = entry.getKey();
if (selector.contains(cssClass)) {
String attr = GRID_CSS_CLASS_WRITTEN_ATTRIBUTE_PREFIX + selector;
if (request.getAttribute(attr) == null) {
request.setAttribute(attr, Boolean.TRUE);
if (!styleStarted) {
styleStarted = true;
writer.writeStart("style", "type", "text/css");
}
writer.writeGridCss(selector, entry.getValue());
}
}
}
}
}
if (styleStarted) {
writer.writeEnd();
}
}
/**
* Writes all grid JavaScript found in the given {@code context} to the
* given {@code writer} unless it's already been written within the
* given {@code request}.
*
* @param writer Can't be {@code null}.
* @param context Can't be {@code null}.
* @param request Can't be {@code null}.
*/
public static void writeGridJavaScript(HtmlWriter writer, ServletContext context, HttpServletRequest request) throws IOException {
if (request.getAttribute(GRID_JAVASCRIPT_WRITTEN_ATTRIBUTE) == null) {
writer.writeStart("script", "type", "text/javascript");
writer.writeAllGridJavaScript(context, request);
writer.writeEnd();
request.setAttribute(GRID_JAVASCRIPT_WRITTEN_ATTRIBUTE, Boolean.TRUE);
}
}
}
private static class CssClassHtmlGrid {
public final String cssClass;
public final HtmlGrid grid;
public CssClassHtmlGrid(String cssClass, HtmlGrid grid) {
this.cssClass = cssClass;
this.grid = grid;
}
}
private class GridItem implements HtmlObject {
private final Object item;
public GridItem(Object item) {
this.item = item;
}
@Override
public void format(HtmlWriter writer) throws IOException {
if (item != null) {
writer.write(item.toString());
}
}
}
}