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 *

 * This code 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 General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

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package com.sun.xml.internal.bind.v2.runtime.property;

import java.lang.reflect.Constructor;

import java.lang.reflect.InvocationTargetException;

import java.util.Collection;

import com.sun.xml.internal.bind.v2.model.core.ID;

import com.sun.xml.internal.bind.v2.model.core.PropertyKind;

import com.sun.xml.internal.bind.v2.model.runtime.RuntimeAttributePropertyInfo;

import com.sun.xml.internal.bind.v2.model.runtime.RuntimeElementPropertyInfo;

import com.sun.xml.internal.bind.v2.model.runtime.RuntimeNonElement;

import com.sun.xml.internal.bind.v2.model.runtime.RuntimePropertyInfo;

import com.sun.xml.internal.bind.v2.model.runtime.RuntimeTypeInfo;

import com.sun.xml.internal.bind.v2.model.runtime.RuntimeValuePropertyInfo;

import com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl;

/**

 * Create {@link Property} objects.

 *

 * @author Kohsuke Kawaguchi (kk@kohsuke.org)

 */

public abstract class PropertyFactory {

    private PropertyFactory() {}

    /**

     * Constructors of the {@link Property} implementation.

     */

    private static final Constructor<? extends Property>[] propImpls;

    static {

        Class<? extends Property>[] implClasses = new Class[] {

            SingleElementLeafProperty.class,

            null, // single reference leaf --- but there's no such thing as "reference leaf"

            null, // no such thing as "map leaf"

            ArrayElementLeafProperty.class,

            null, // array reference leaf --- but there's no such thing as "reference leaf"

            null, // no such thing as "map leaf"

            SingleElementNodeProperty.class,

            SingleReferenceNodeProperty.class,

            SingleMapNodeProperty.class,

            ArrayElementNodeProperty.class,

            ArrayReferenceNodeProperty.class,

            null, // map is always a single property (Map doesn't implement Collection)

        };

        propImpls = new Constructor[implClasses.length];

        for( int i=0; i<propImpls.length; i++ ) {

            if(implClasses[i]!=null)

                // this pointless casting necessary for Mustang

                propImpls[i] = (Constructor)implClasses[i].getConstructors()[0];

        }

    }

    /**

     * Creates/obtains a properly configured {@link Property}

     * object from the given description.

     */

    public static Property create( JAXBContextImpl grammar, RuntimePropertyInfo info ) {

        PropertyKind kind = info.kind();

        switch(kind) {

        case ATTRIBUTE:

            return new AttributeProperty(grammar,(RuntimeAttributePropertyInfo)info);

        case VALUE:

            return new ValueProperty(grammar,(RuntimeValuePropertyInfo)info);

        case ELEMENT:

            if(((RuntimeElementPropertyInfo)info).isValueList())

                return new ListElementProperty(grammar,(RuntimeElementPropertyInfo) info);

            break;

        case REFERENCE:

        case MAP:

            break;

        default:

            assert false;

        }

        boolean isCollection = info.isCollection();

        boolean isLeaf = isLeaf(info);

        Constructor<? extends Property> c = propImpls[(isLeaf?0:6)+(isCollection?3:0)+kind.propertyIndex];

        try {

            return c.newInstance( grammar, info );

        } catch (InstantiationException e) {

            throw new InstantiationError(e.getMessage());

        } catch (IllegalAccessException e) {

            throw new IllegalAccessError(e.getMessage());

        } catch (InvocationTargetException e) {

            Throwable t = e.getCause();

            if(t instanceof Error)

                throw (Error)t;

            if(t instanceof RuntimeException)

                throw (RuntimeException)t;

            throw new AssertionError(t);

        }

    }

    /**

     * Look for the case that can be optimized as a leaf,

     * which is a kind of type whose XML representation is just PCDATA.

     */

    static boolean isLeaf(RuntimePropertyInfo info) {

        Collection<? extends RuntimeTypeInfo> types = info.ref();

        if(types.size()!=1)     return false;

        RuntimeTypeInfo rti = types.iterator().next();

        if(!(rti instanceof RuntimeNonElement)) return false;

        if(info.id()==ID.IDREF)

            // IDREF is always handled as leaf -- Transducer maps IDREF String back to an object

            return true;

        if(((RuntimeNonElement)rti).getTransducer()==null)

            // Transducer!=null means definitely binds to PCDATA.

            // even if transducer==null, a referene might be IDREF,

            // in which case it will still produce PCDATA in this reference.

            return false;

        if(!info.getIndividualType().equals(rti.getType()))

            return false;

        return true;

    }

}