/*
* This program is free software; you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
* Foundation.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* or from the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU Lesser General Public License for more details.
*
* Copyright (c) 2006 - 2013 Pentaho Corporation and Contributors. All rights reserved.
*/
package org.pentaho.reporting.libraries.css.resolver.values.computed.content;
import java.net.URL;
import java.util.ArrayList;
import java.util.HashMap;
import org.pentaho.reporting.libraries.base.util.DebugLog;
import org.pentaho.reporting.libraries.css.counter.CounterStyle;
import org.pentaho.reporting.libraries.css.counter.CounterStyleFactory;
import org.pentaho.reporting.libraries.css.dom.DocumentContext;
import org.pentaho.reporting.libraries.css.dom.LayoutElement;
import org.pentaho.reporting.libraries.css.dom.LayoutStyle;
import org.pentaho.reporting.libraries.css.keys.content.ContentStyleKeys;
import org.pentaho.reporting.libraries.css.keys.content.ContentValues;
import org.pentaho.reporting.libraries.css.keys.internal.InternalStyleKeys;
import org.pentaho.reporting.libraries.css.keys.list.ListStyleKeys;
import org.pentaho.reporting.libraries.css.model.StyleKey;
import org.pentaho.reporting.libraries.css.resolver.FunctionEvaluationException;
import org.pentaho.reporting.libraries.css.resolver.function.ContentFunction;
import org.pentaho.reporting.libraries.css.resolver.function.FunctionFactory;
import org.pentaho.reporting.libraries.css.resolver.tokens.ContentToken;
import org.pentaho.reporting.libraries.css.resolver.tokens.computed.CloseQuoteToken;
import org.pentaho.reporting.libraries.css.resolver.tokens.computed.ContentsToken;
import org.pentaho.reporting.libraries.css.resolver.tokens.computed.CounterToken;
import org.pentaho.reporting.libraries.css.resolver.tokens.computed.OpenQuoteToken;
import org.pentaho.reporting.libraries.css.resolver.tokens.statics.StaticTextToken;
import org.pentaho.reporting.libraries.css.resolver.values.ContentSpecification;
import org.pentaho.reporting.libraries.css.resolver.values.ResolveHandler;
import org.pentaho.reporting.libraries.css.values.CSSAttrFunction;
import org.pentaho.reporting.libraries.css.values.CSSConstant;
import org.pentaho.reporting.libraries.css.values.CSSFunctionValue;
import org.pentaho.reporting.libraries.css.values.CSSStringType;
import org.pentaho.reporting.libraries.css.values.CSSStringValue;
import org.pentaho.reporting.libraries.css.values.CSSValue;
import org.pentaho.reporting.libraries.css.values.CSSValueList;
import org.pentaho.reporting.libraries.resourceloader.ResourceKey;
import org.pentaho.reporting.libraries.resourceloader.ResourceManager;
public class ContentResolveHandler implements ResolveHandler
{
private static final ContentToken[] DEFAULT_CONTENT = new ContentToken[]{ContentsToken.CONTENTS};
private static final ContentToken[] PSEUDO_CONTENT = new ContentToken[]{};
private CSSValue listCounter;
private HashMap tokenMapping;
public ContentResolveHandler()
{
tokenMapping = new HashMap();
tokenMapping.put(ContentValues.CONTENTS, ContentsToken.CONTENTS);
tokenMapping.put(ContentValues.OPEN_QUOTE, new OpenQuoteToken(false));
tokenMapping.put(ContentValues.NO_OPEN_QUOTE, new OpenQuoteToken(true));
tokenMapping.put(ContentValues.CLOSE_QUOTE, new CloseQuoteToken(false));
tokenMapping.put(ContentValues.NO_CLOSE_QUOTE, new CloseQuoteToken(true));
final CSSStringValue param =
new CSSStringValue(CSSStringType.STRING, "list-item");
listCounter = new CSSFunctionValue("counter", new CSSValue[]{param});
}
/**
* This indirectly defines the resolve order. The higher the order, the more
* dependent is the resolver on other resolvers to be complete.
*
* @return the array of required style keys.
*/
public StyleKey[] getRequiredStyles()
{
return new StyleKey[]{
ContentStyleKeys.COUNTER_RESET,
ContentStyleKeys.COUNTER_INCREMENT,
ContentStyleKeys.QUOTES,
ContentStyleKeys.STRING_SET
};
}
/**
* Resolves a single property.
*
* @param process the current layout process controlling everyting
* @param element the current layout element that is processed
* @param key the style key that is computed.
*/
public void resolve(final DocumentContext process,
final LayoutElement element,
final StyleKey key)
{
final LayoutStyle layoutContext = element.getLayoutStyle();
final ContentSpecification contentSpecification =
(ContentSpecification) layoutContext.getValue(InternalStyleKeys.INTERNAL_CONTENT);
final CSSValue value = layoutContext.getValue(key);
if (value instanceof CSSConstant)
{
if (ContentValues.NONE.equals(value))
{
contentSpecification.setAllowContentProcessing(false);
contentSpecification.setInhibitContent(false);
contentSpecification.setContents(PSEUDO_CONTENT);
return;
}
else if (ContentValues.INHIBIT.equals(value))
{
contentSpecification.setAllowContentProcessing(false);
contentSpecification.setInhibitContent(true);
contentSpecification.setContents(PSEUDO_CONTENT);
return;
}
else if (ContentValues.NORMAL.equals(value))
{
// if (layoutContext.isPseudoElement())
// {
// if (isListMarker(element))
// {
// processListItem(process, element, contentSpecification);
// return;
// }
// else
// {
// // a pseudo-element does not have content by default.
// contentSpecification.setAllowContentProcessing(false);
// contentSpecification.setInhibitContent(true);
// contentSpecification.setContents(PSEUDO_CONTENT);
// return;
// }
// }
}
}
contentSpecification.setInhibitContent(false);
contentSpecification.setAllowContentProcessing(true);
contentSpecification.setContents(DEFAULT_CONTENT);
if (value instanceof CSSAttrFunction)
{
final ContentToken token = evaluateFunction((CSSFunctionValue) value, process, element);
if (token == null)
{
return;
}
contentSpecification.setContents(new ContentToken[]{token});
}
if (value instanceof CSSValueList == false)
{
return; // cant handle that one
}
final ArrayList tokens = new ArrayList();
final CSSValueList list = (CSSValueList) value;
final int size = list.getLength();
for (int i = 0; i < size; i++)
{
final CSSValueList sequence = (CSSValueList) list.getItem(i);
for (int j = 0; j < sequence.getLength(); j++)
{
final CSSValue content = sequence.getItem(j);
final ContentToken token = createToken(process, element, content);
if (token == null)
{
// ok, a failure. Skip to the next content spec ...
tokens.clear();
break;
}
tokens.add(token);
}
if (tokens.isEmpty() == false)
{
final ContentToken[] contents = (ContentToken[]) tokens.toArray
(new ContentToken[tokens.size()]);
contentSpecification.setContents(contents);
return;
}
}
}
private void processListItem(final DocumentContext process,
final LayoutElement element,
final ContentSpecification contentSpecification)
{
contentSpecification.setAllowContentProcessing(false);
contentSpecification.setInhibitContent(false);
final LayoutStyle layoutContext = element.getLayoutStyle();
final CSSValue value =
layoutContext.getValue(ListStyleKeys.LIST_STYLE_IMAGE);
if (value != null)
{
final ContentToken token = createToken(process, element, value);
if (token != null)
{
contentSpecification.setContents(new ContentToken[]{token});
return;
}
}
final ContentToken token = createToken(process, element, listCounter);
if (token instanceof CounterToken)
{
final CounterToken counterToken = (CounterToken) token;
final CounterStyle style = counterToken.getStyle();
final String suffix = style.getSuffix();
if (suffix == null || suffix.length() == 0)
{
contentSpecification.setContents(new ContentToken[]{token});
}
else
{
contentSpecification.setContents
(new ContentToken[]{counterToken, new StaticTextToken(suffix)});
}
}
else
{
contentSpecification.setContents(new ContentToken[]{token});
}
}
// private boolean isListMarker (final LayoutElement element)
// {
// final LayoutStyle layoutContext = element.getLayoutStyle();
// if ("marker".equals(layoutContext.getPseudoElement()) == false)
// {
// return false;
// }
// final LayoutElement parent = element.getParentLayoutElement();
// if (parent == null)
// {
// return false;
// }
// final CSSValue parentDisplayRole =
// parent.getLayoutStyle().getValue(BoxStyleKeys.DISPLAY_ROLE);
// if (DisplayRole.LIST_ITEM.equals(parentDisplayRole))
// {
// return true;
// }
//
// return false;
// }
private ContentToken createToken(final DocumentContext process,
final LayoutElement element,
final CSSValue content)
{
try
{
if (content instanceof CSSStringValue)
{
final CSSStringValue sval = (CSSStringValue) content;
if (CSSStringType.STRING.equals(sval.getType()))
{
return new StaticTextToken(sval.getValue());
}
else
{
// this is an external URL, so try to load it.
final CSSFunctionValue function = new CSSFunctionValue
("url", new CSSValue[]{sval});
return evaluateFunction(function, process, element);
}
}
if (content instanceof CSSConstant)
{
if (ContentValues.DOCUMENT_URL.equals(content))
{
final ResourceKey baseKey = process.getContextKey();
final ResourceManager resourceManager = process.getResourceManager();
final URL url = resourceManager.toURL(baseKey);
if (url != null)
{
return new StaticTextToken(url.toExternalForm());
}
return null;
}
final ContentToken token = (ContentToken) tokenMapping.get(content);
if (token != null)
{
return token;
}
return resolveContentAlias(content);
}
if (content instanceof CSSFunctionValue)
{
return evaluateFunction((CSSFunctionValue) content, process, element);
}
}
catch (Exception e)
{
DebugLog.log("Content-Resolver: Failed to evaluate " + content);
}
return null;
}
private ContentToken resolveContentAlias(final CSSValue content)
{
if (ContentValues.FOOTNOTE.equals(content))
{
final CounterStyle style =
CounterStyleFactory.getInstance().getCounterStyle("normal");
return new CounterToken("footnote", style);
}
if (ContentValues.ENDNOTE.equals(content))
{
final CounterStyle style =
CounterStyleFactory.getInstance().getCounterStyle("normal");
return new CounterToken("endnote", style);
}
if (ContentValues.SECTIONNOTE.equals(content))
{
final CounterStyle style =
CounterStyleFactory.getInstance().getCounterStyle("normal");
return new CounterToken("section-note", style);
}
if (ContentValues.LISTITEM.equals(content))
{
final CounterStyle style =
CounterStyleFactory.getInstance().getCounterStyle("normal");
return new CounterToken("list-item", style);
}
return null;
}
private ContentToken evaluateFunction(final CSSFunctionValue function,
final DocumentContext process,
final LayoutElement element)
{
final ContentFunction styleFunction =
FunctionFactory.getInstance().getContentFunction(function.getFunctionName());
if (styleFunction == null)
{
return null;
}
try
{
return styleFunction.evaluate(process, element, function);
}
catch (FunctionEvaluationException e)
{
DebugLog.log("Evaluation failed " + e);
return null;
}
}
}