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// Metawidget
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library 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.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
package org.metawidget.inspectionresultprocessor.faces;
import java.util.Collection;
import java.util.Map;
import java.util.regex.Matcher;
import javax.faces.context.FacesContext;
import org.metawidget.faces.FacesUtils;
import org.metawidget.faces.component.UIMetawidget;
import org.metawidget.inspectionresultprocessor.iface.InspectionResultProcessorException;
import org.metawidget.inspectionresultprocessor.impl.BaseInspectionResultProcessor;
import org.metawidget.inspector.impl.propertystyle.PropertyStyle;
import org.metawidget.util.ArrayUtils;
import org.metawidget.util.CollectionUtils;
import org.metawidget.util.simple.StringUtils;
import org.w3c.dom.Element;
/**
* Processes the inspection result and evaluates any expressions of the form #{...}
* using JSF EL.
*
* @author Richard Kennard
*/
public class FacesInspectionResultProcessor
extends BaseInspectionResultProcessor {
//
// Private statics
//
private final static String UNDERSCORE_THIS_ATTRIBUTE = "_this";
//
// Private members
//
private PropertyStyle mInjectThis;
private String[] mIgnoreAttributes;
//
// Constructors
//
/**
* Constructs a FacesInspectionResultProcessor.
*/
public FacesInspectionResultProcessor() {
this( new FacesInspectionResultProcessorConfig() );
}
/**
* Constructs a FacesInspectionResultProcessor.
*/
public FacesInspectionResultProcessor( FacesInspectionResultProcessorConfig config ) {
mInjectThis = config.getInjectThis();
mIgnoreAttributes = config.getIgnoreAttributes();
}
//
// Protected methods
//
@Override
protected void processEntity( Map attributes, UIMetawidget metawidget, Object toInspect, String type, String... names ) {
FacesContext context = FacesContext.getCurrentInstance();
if ( context == null ) {
throw InspectionResultProcessorException.newException( "FacesContext not available to FacesInspectionResultProcessor" );
}
Map requestMap = null;
try {
if ( mInjectThis != null ) {
requestMap = context.getExternalContext().getRequestMap();
requestMap.put( UNDERSCORE_THIS_ATTRIBUTE, mInjectThis.traverse( toInspect, type, true, names ).getValue() );
}
super.processEntity( attributes, metawidget, toInspect, type, names );
} finally {
// UNDERSCORE_THIS_ATTRIBUTE should not be available outside of our particular
// evaluation
if ( requestMap != null ) {
requestMap.remove( UNDERSCORE_THIS_ATTRIBUTE );
}
}
}
@Override
protected void processTraits( Element entity, UIMetawidget metawidget, Object toInspect, String type, String... names ) {
FacesContext context = FacesContext.getCurrentInstance();
if ( context == null ) {
throw InspectionResultProcessorException.newException( "FacesContext not available to FacesInspectionResultProcessor" );
}
Map requestMap = null;
try {
if ( mInjectThis != null ) {
requestMap = context.getExternalContext().getRequestMap();
requestMap.put( UNDERSCORE_THIS_ATTRIBUTE, mInjectThis.traverse( toInspect, type, false, names ).getValue() );
}
super.processTraits( entity, metawidget, toInspect, type, names );
} finally {
// UNDERSCORE_THIS_ATTRIBUTE should not be available outside of our particular
// evaluation
if ( requestMap != null ) {
requestMap.remove( UNDERSCORE_THIS_ATTRIBUTE );
}
}
}
@Override
protected void processAttributes( Map attributes, UIMetawidget metawidget ) {
// For each attribute value...
for ( Map.Entry entry : attributes.entrySet() ) {
String key = entry.getKey();
String value = entry.getValue();
// ...except ones that are *expected* to be EL expressions...
if ( ArrayUtils.contains( mIgnoreAttributes, key )) {
if ( mInjectThis != null ) {
String unwrappedExpression = FacesUtils.unwrapExpression( value );
if ( unwrappedExpression.startsWith( UNDERSCORE_THIS_ATTRIBUTE + StringUtils.SEPARATOR_DOT ) ) {
throw InspectionResultProcessorException.newException( "Expression '" + value + "' (for '" + key + "') must not contain '" + UNDERSCORE_THIS_ATTRIBUTE + "' (see Metawidget Reference Guide)" );
}
}
continue;
}
// ...that contains an EL expression...
Matcher matcher = FacesUtils.matchExpression( value );
int matchOffset = 0;
while ( matcher.find() ) {
String expression = matcher.group( 0 );
// Sanity checks
if ( mInjectThis == null && matcher.group( 2 ).startsWith( UNDERSCORE_THIS_ATTRIBUTE + StringUtils.SEPARATOR_DOT ) ) {
throw InspectionResultProcessorException.newException( "Expression for '" + value + "' contains '" + UNDERSCORE_THIS_ATTRIBUTE + "', but " + FacesInspectionResultProcessorConfig.class.getSimpleName() + ".setInjectThis is null" );
}
// ...evaluate it...
try {
FacesContext context = FacesContext.getCurrentInstance();
@SuppressWarnings( "deprecation" )
Object valueObject = context.getApplication().createValueBinding( expression ).getValue( context );
String valueObjectAsString;
if ( valueObject == null ) {
// Support the default case (when the String is just one EL)
if ( matcher.start() == 0 && matcher.end() == value.length() ) {
value = null;
break;
}
valueObjectAsString = "";
} else {
// Support the default case (when the String is just one EL)
if ( matcher.start() == 0 && matcher.end() == value.length() ) {
if ( valueObject instanceof Collection ) {
value = CollectionUtils.toString( (Collection) valueObject );
} else if ( valueObject.getClass().isArray() ) {
value = ArrayUtils.toString( valueObject );
} else {
value = String.valueOf( valueObject );
}
break;
}
valueObjectAsString = String.valueOf( valueObject );
}
// Replace multiple ELs within the String
value = new StringBuilder( value ).replace( matcher.start() + matchOffset, matcher.end() + matchOffset, valueObjectAsString ).toString();
matchOffset += valueObjectAsString.length() - ( matcher.end() - matcher.start() );
} catch ( Exception e ) {
// We have found it helpful to include the actual expression we were trying to
// evaluate
throw InspectionResultProcessorException.newException( "Unable to evaluate " + value, e );
}
}
// ...and replace it
attributes.put( key, value );
}
}
}
