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EE4J Compatible Implementation for Jakarta Faces API
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/*
 * Copyright (c) 1997, 2018 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0, which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

package com.sun.faces.el;

import javax.el.ELContext;
import javax.el.ELException;
import javax.el.ELResolver;
import javax.faces.context.FacesContext;
import javax.faces.el.EvaluationException;
import javax.faces.el.PropertyResolver;

import java.beans.FeatureDescriptor;
import java.util.Iterator;
import java.util.List;

public class PropertyResolverChainWrapper extends ELResolver {

    @SuppressWarnings("deprecation")
    private PropertyResolver legacyPR = null;
    
    @SuppressWarnings("deprecation")
    public PropertyResolverChainWrapper(PropertyResolver propertyResolver) {
        this.legacyPR = propertyResolver;
    }

    @Override
    @SuppressWarnings("deprecation")
    public Object getValue(ELContext context, Object base, Object property) 
        throws ELException {
        if (base == null || property == null) {
            return null;
        }        
        Object result;
        context.setPropertyResolved(true);
        FacesContext facesContext = (FacesContext) 
            context.getContext(FacesContext.class);
        ELContext jsfEL = facesContext.getELContext();
        jsfEL.setPropertyResolved(true);
        if (base instanceof List || base.getClass().isArray()) {
            Object indexObj = facesContext.getApplication().getExpressionFactory().
                    coerceToType(property, Integer.class);
            int index = ((Integer)indexObj).intValue();
            try {
                result = legacyPR.getValue(base, index);
            } catch (EvaluationException ex) {
                context.setPropertyResolved(false);
                throw new ELException(ex);
            }
        } else {
            try {
                result = legacyPR.getValue(base, property);               
            } catch (EvaluationException ex) {
                context.setPropertyResolved(false);
                throw new ELException(ex);
            }    
        }
        context.setPropertyResolved(jsfEL.isPropertyResolved());
        return result;
    }

    @Override
    @SuppressWarnings("deprecation")
    public Class getType(ELContext context, Object base, Object property) 
        throws ELException {
        if (base == null || property == null) {
            return null;
        }
        
        Class result;
        context.setPropertyResolved(true);
        FacesContext facesContext = (FacesContext)
                context.getContext(FacesContext.class);
        ELContext jsfEL = facesContext.getELContext();
        jsfEL.setPropertyResolved(true);
        if (base instanceof List || base.getClass().isArray()) {
            Object indexObj = facesContext.getApplication().getExpressionFactory().
                    coerceToType(property, Integer.class);
            int index = ((Integer)indexObj).intValue();
            try {
                result = legacyPR.getType(base, index);               
            } catch (EvaluationException ex) {
                context.setPropertyResolved(false);
                throw new ELException(ex);
            }
        } else {
            try {
                result = legacyPR.getType(base, property);                
            } catch (EvaluationException ex) {
                context.setPropertyResolved(false);
                throw new ELException(ex);
            }    
        }
        context.setPropertyResolved(jsfEL.isPropertyResolved());
        return result;
    }

    @Override
    @SuppressWarnings("deprecation")
    public void  setValue(ELContext context, Object base, Object property,
        Object val) throws ELException {
        if (base == null || property == null) {
            return;
        }       

        context.setPropertyResolved(true);
        FacesContext facesContext = (FacesContext)
            context.getContext(FacesContext.class);
        ELContext jsfEL = facesContext.getELContext();
        jsfEL.setPropertyResolved(true);
        if (base instanceof List || base.getClass().isArray()) {
            Object indexObj = facesContext.getApplication().getExpressionFactory().
                    coerceToType(property, Integer.class);
            int index = ((Integer)indexObj).intValue();            
            try {
                legacyPR.setValue(base, index, val);
            } catch (EvaluationException ex) {
                context.setPropertyResolved(false);
                throw new ELException(ex);
            }
        } else {
            try {
                legacyPR.setValue(base, property, val);
            } catch (EvaluationException ex) {
                context.setPropertyResolved(false);
                throw new ELException(ex);
            }    
        }
        context.setPropertyResolved(jsfEL.isPropertyResolved());
    }

    @Override
    @SuppressWarnings("deprecation")
    public boolean isReadOnly(ELContext context, Object base, Object property) 
        throws ELException {
        if (base == null || property == null) {
            return false;
        }      
        boolean result;
        context.setPropertyResolved(true);
        FacesContext facesContext = (FacesContext)
            context.getContext(FacesContext.class);
        ELContext jsfEL = facesContext.getELContext();
        jsfEL.setPropertyResolved(true);
        if (base instanceof List || base.getClass().isArray()) {
            Object indexObj = facesContext.getApplication().getExpressionFactory().
                    coerceToType(property, Integer.class);
            int index = ((Integer)indexObj).intValue();
            try {
                result = legacyPR.isReadOnly(base, index);                
            } catch (EvaluationException ex) {
                context.setPropertyResolved(false);
                throw new ELException(ex);
            }
        } else {
            try {
                result = legacyPR.isReadOnly(base, property);                
            } catch (EvaluationException ex) {
                context.setPropertyResolved(false);
                throw new ELException(ex);
            }    
        }
        context.setPropertyResolved(jsfEL.isPropertyResolved());
        return result;
    }

    @Override
    public Iterator getFeatureDescriptors(ELContext context, 
                                                             Object base) {
        return null;
    }

    @Override
    public Class getCommonPropertyType(ELContext context, Object base) {
        if ( base == null ) {
            return Object.class;
        }
        return null;
    }

}