Java example source code file (ConstField.java)

This example Java source code file (ConstField.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

abstractfield, accessor, classoutlineimpl, constfield, cpropertyinfo, fieldaccessor, jblock, jexpression, jfieldvar, jprimitivetype, jtype, jvar, string, unsupportedoperationexception

The ConstField.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.tools.internal.xjc.generator.bean.field;

import com.sun.codemodel.internal.JBlock;
import com.sun.codemodel.internal.JExpr;
import com.sun.codemodel.internal.JExpression;
import com.sun.codemodel.internal.JFieldVar;
import com.sun.codemodel.internal.JMod;
import com.sun.codemodel.internal.JPrimitiveType;
import com.sun.codemodel.internal.JType;
import com.sun.codemodel.internal.JVar;
import com.sun.tools.internal.xjc.generator.bean.ClassOutlineImpl;
import com.sun.tools.internal.xjc.model.CPropertyInfo;
import com.sun.tools.internal.xjc.outline.FieldAccessor;

/**
 * Realizes a property as a "public static final" property on the interface.
 * This class can handle both boxed/unboxed types and both
 * single/colllection.
 *
 * @author
 *     Kohsuke Kawaguchi (kohsuke.kawaguchi@sun.com)
 */
final class ConstField extends AbstractField {
//    /**
//     * Number of items in this property, when
//     * {@link #isCollection}==true.
//     */
//    private final int count=1;

    /** Generated constant property on the interface. */
    private final JFieldVar $ref;

    ConstField( ClassOutlineImpl outline, CPropertyInfo prop ) {
        super(outline,prop);

        // we only support value constraints for a single-value property.
        assert !prop.isCollection();

        JPrimitiveType ptype = implType.boxify().getPrimitiveType();

        // generate the constant
        JExpression defaultValue = null;
        if(prop.defaultValue!=null)
            defaultValue = prop.defaultValue.compute(outline.parent());

        $ref = outline.ref.field(JMod.PUBLIC|JMod.STATIC|JMod.FINAL,
            ptype!=null?ptype:implType, prop.getName(true), defaultValue );
        $ref.javadoc().append(prop.javadoc);

        annotate($ref);
    }

    public JType getRawType() {
//        if( isCollection )      return getInfo().array();
        return exposedType;
    }


    public FieldAccessor create(JExpression target) {
        return new Accessor(target);
    }

    private class Accessor extends AbstractField.Accessor {

        Accessor( JExpression $target ) {
            super($target);
        }

        public void unsetValues( JBlock body ) {
            ;   // can't unset values
        }
        public JExpression hasSetValue() {
            return null;    // can't generate the isSet/unset methods
        }
        public void toRawValue(JBlock block, JVar $var) {
            // TODO: rethink abstraction. Those constant fields
            // don't have "access" to them.
            throw new UnsupportedOperationException();
        }

        public void fromRawValue(JBlock block, String uniqueName, JExpression $var) {
            throw new UnsupportedOperationException();
        }
    }
}