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  /*
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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   * Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
   *
   * The contents of this file are subject to the terms of either the GNU
   * General Public License Version 2 only ("GPL") or the Common Development
   * and Distribution License("CDDL") (collectively, the "License").  You
   * may not use this file except in compliance with the License.  You can
  * obtain a copy of the License at
  * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
  * or packager/legal/LICENSE.txt.  See the License for the specific
  * language governing permissions and limitations under the License.
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  * and therefore, elected the GPL Version 2 license, then the option applies
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 package javax.faces.component;
 
 
Contains common utility methods used by both UISelectOne and UISelectMany.
 
 class SelectUtils {
 
 
     // ------------------------------------------------------------ Constructors
 
     
     private SelectUtils() { }
 
 
     // ------------------------------------------------- Package Private Methods
 
    

Return true if the specified value matches one of the available options, performing a recursive search if if a javax.faces.model.SelectItemGroup instance is detected.

Parameters:
ctx javax.faces.context.FacesContext for the current request
value UIComponent value to be tested
items Iterator over the javax.faces.model.SelectItems to be checked
converter the javax.faces.convert.Converter associated with this component
 
     static boolean matchValue(FacesContext ctx,
                               UIComponent component,
                               Object value,
                               Iterator<SelectItemitems,
                               Converter converter) {
 
         while (items.hasNext()) {
             SelectItem item = items.next();
             if (item instanceof SelectItemGroup) {
                 SelectItem subitems[] =
                       ((SelectItemGroupitem).getSelectItems();
                 if ((subitems != null) && (subitems.length > 0)) {
                     if (matchValue(ctxcomponentvaluenew ArrayIterator(subitems), converter)) {
                         return (true);
                     }
                 }
             } else {
                 Object compareValue = null;
                 
                 try {
                     compareValue = doConversion(ctxcomponentitemvalue,
                        converter);
                } catch (IllegalStateException ise) {
                    continue;
                }
                
                if (null == compareValue && null == value) {
                    return true;
                }
                if (value.equals(compareValue)) {
                    return (true);
                }
            }
        }
        return (false);
    }
    
    
Returns true iff component has a UISelectItem child whose itemValue exactly matches the argument value

Parameters:
ctx
component
value
items
Returns:
    
    static boolean valueIsNoSelectionOption(FacesContext ctx,
            UIComponent component,
            Object value,
            Iterator<SelectItemitems,
            Converter converter) {
        boolean result = false;
        
        while (items.hasNext()) {
            SelectItem item = items.next();
            if (item instanceof SelectItemGroup) {
                SelectItem subitems[] =
                      ((SelectItemGroupitem).getSelectItems();
                if ((subitems != null) && (subitems.length > 0)) {
                    if (valueIsNoSelectionOption(ctxcomponentvaluenew ArrayIterator(subitems), converter)) {
                        result = true;
                        break;
                    }
                }
            } else {
                Object compareValue = null;
                
                try {
                    compareValue = doConversion(ctxcomponentitemvalue,
                        converter);
                } catch (IllegalStateException ise) {
                    continue;
                }
                
                if (null == compareValue && null == value &&
                    item.isNoSelectionOption()) {
                    result = true;
                    break;
                } else if (value.equals(compareValue) && item.isNoSelectionOption()) {
                    result = true;
                    break;
                }
            }
            
        }
        
        return result;
    }
    
    private static Object doConversion(FacesContext ctx
            UIComponent componentSelectItem item
            Object valueConverter converterthrows IllegalStateException {
        Object itemValue = item.getValue();
        if (itemValue == null && value == null) {
            return (null);
        }
        if ((value == null) ^ (itemValue == null)) {
            throw new IllegalStateException("Either value was null, or itemValue was null, but not both.");
        }
        Object compareValue;
        if (converter == null) {
            compareValue =
                    coerceToModelType(ctxitemValuevalue.getClass());
        } else {
            compareValue = itemValue;
            if (compareValue instanceof String
                 && !(value instanceof String)) {
                // type mismatch between the time and the value we're
                // comparing.  Invoke the Converter.
                compareValue = converter.getAsObject(ctx,
                        component,
                        (StringcompareValue);
            }
        }
        return compareValue;
    }


    
Coerce the provided value to the specified type using EL coercion.

Parameters:
ctx the javax.faces.context.FacesContext for the current request
value the value to coerce
toType the type value should be coerced to
Returns:
the result of the EL coersion
See also:
javax.el.ExpressionFactory.coerceToType(java.lang.Object,java.lang.Class)
    private static Object coerceToModelType(FacesContext ctx,
                                            Object value,
                                            Class toType) {
        Object newValue;
        try {
            ExpressionFactory ef = ctx.getApplication().getExpressionFactory();
            newValue = ef.coerceToType(valuetoType);
        } catch (ELException ele) {
            newValue = value;
        } catch (IllegalArgumentException iae) {
            // If coerceToType fails, per the docs it should throw
            // an ELException, however, GF 9.0 and 9.0u1 will throw
            // an IllegalArgumentException instead (see GF issue 1527).
            newValue = value;
        }
        return newValue;
    }
    // ---------------------------------------------------------- Nested Classes


    
Exposes an Array via an Iterator
    static class ArrayIterator implements Iterator {
        public ArrayIterator(Object items[]) {
            this. = items;
        }
        private Object items[];
        private int index = 0;
        public boolean hasNext() {
            return ( < .);
        }
        public Object next() {
            try {
                return ([++]);
            } catch (IndexOutOfBoundsException e) {
                throw new NoSuchElementException();
            }
        }
        public void remove() {
            throw new UnsupportedOperationException();
        }
    } // END ArrayIterator
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