/*
* 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 org.pentaho.reporting.libraries.base.util.DebugLog;
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.model.StyleKey;
import org.pentaho.reporting.libraries.css.resolver.FunctionEvaluationException;
import org.pentaho.reporting.libraries.css.resolver.function.FunctionFactory;
import org.pentaho.reporting.libraries.css.resolver.function.StyleValueFunction;
import org.pentaho.reporting.libraries.css.resolver.tokens.ContentToken;
import org.pentaho.reporting.libraries.css.resolver.tokens.statics.ExternalContentToken;
import org.pentaho.reporting.libraries.css.resolver.tokens.statics.ResourceContentToken;
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.CSSRawValue;
import org.pentaho.reporting.libraries.css.values.CSSResourceValue;
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;
import java.net.URL;
import java.util.ArrayList;
public class XAlternateTextResolveHandler implements ResolveHandler {
private static final ContentToken[] DEFAULT_CONTENT = new ContentToken[ 0 ];
public XAlternateTextResolveHandler() {
}
/**
* 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_DEFINE
};
}
/**
* Resolves a String. As the string may contain the 'contents' property, it is not resolvable here. The
* ContentNormalizer needs to handle this property instead. (But this code prepares everything ..)
*/
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.setStrings( XAlternateTextResolveHandler.DEFAULT_CONTENT );
return;
}
}
contentSpecification.setStrings( XAlternateTextResolveHandler.DEFAULT_CONTENT );
if ( value instanceof CSSAttrFunction ) {
final ContentToken token =
evaluateFunction( (CSSFunctionValue) value, process, element );
if ( token == null ) {
return;
}
contentSpecification.setStrings( 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 );
}
}
final ContentToken[] contents = (ContentToken[]) tokens.toArray
( new ContentToken[ tokens.size() ] );
contentSpecification.setStrings( contents );
}
private ContentToken createToken( final DocumentContext process,
final LayoutElement element,
final CSSValue content ) {
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 CSSFunctionValue ) {
return evaluateFunction( (CSSFunctionValue) content, 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;
}
}
return null;
}
private ContentToken evaluateFunction( final CSSFunctionValue function,
final DocumentContext process,
final LayoutElement element ) {
final StyleValueFunction styleFunction =
FunctionFactory.getInstance().getStyleFunction( function.getFunctionName() );
try {
final CSSValue value = styleFunction.evaluate( process, element, function );
if ( value instanceof CSSResourceValue ) {
final CSSResourceValue refValue = (CSSResourceValue) value;
return new ResourceContentToken( refValue.getValue() );
} else if ( value instanceof CSSStringValue ) {
final CSSStringValue strval = (CSSStringValue) value;
return new StaticTextToken( strval.getValue() );
} else if ( value instanceof CSSRawValue ) {
final CSSRawValue rawValue = (CSSRawValue) value;
return new ExternalContentToken( rawValue.getValue() );
}
return new StaticTextToken( value.getCSSText() );
} catch ( FunctionEvaluationException e ) {
DebugLog.log( "Evaluation failed " + e );
return null;
}
}
}