Java example source code file (PropertyFactory.java)

This example Java source code file (PropertyFactory.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

class, collection, constructor, error, invocationtargetexception, jaxbcontextimpl, listelementproperty, map, property, propertyfactory, propertykind, reflection, runtimeexception, runtimetypeinfo, util, valueproperty

The PropertyFactory.java Java example source code

/*
 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * 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,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

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;
    }
}