Java example source code file (JPrimitiveType.java)

This example Java source code file (JPrimitiveType.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

jarrayclass, jclass, jcodemodel, jexpression, jprimitivetype, jtype, string, value

The JPrimitiveType.java Java example source code

/*
 * Copyright (c) 1997, 2010, 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.codemodel.internal;


/**
 * Java built-in primitive types.
 *
 * Instances of this class can be obtained as constants of {@link JCodeModel},
 * such as {@link JCodeModel#BOOLEAN}.
 */
public final class JPrimitiveType extends JType {

    private final String typeName;
    private final JCodeModel owner;
    /**
     * Corresponding wrapper class.
     * For example, this would be "java.lang.Short" for short.
     */
    private final JClass wrapperClass;

    JPrimitiveType(JCodeModel owner, String typeName, Class<?> wrapper ) {
        this.owner = owner;
        this.typeName = typeName;
        this.wrapperClass = owner.ref(wrapper);
    }

    public JCodeModel owner() { return owner; }

    public String fullName() {
        return typeName;
    }

    public String name() {
        return fullName();
    }

    public boolean isPrimitive() {
        return true;
    }

    private JClass arrayClass;
    public JClass array() {
        if(arrayClass==null)
            arrayClass = new JArrayClass(owner,this);
        return arrayClass;
    }

    /**
     * Obtains the wrapper class for this primitive type.
     * For example, this method returns a reference to java.lang.Integer
     * if this object represents int.
     */
    public JClass boxify() {
        return wrapperClass;
    }

    /**
     * @deprecated calling this method from {@link JPrimitiveType}
     * would be meaningless, since it's always guaranteed to
     * return <tt>this.
     */
    public JType unboxify() {
        return this;
    }

    /**
     * @deprecated
     *      Use {@link #boxify()}.
     */
    public JClass getWrapperClass() {
        return boxify();
    }

    /**
     * Wraps an expression of this type to the corresponding wrapper class.
     * For example, if this class represents "float", this method will return
     * the expression <code>new Float(x) for the paramter x.
     *
     * REVISIT: it's not clear how this method works for VOID.
     */
    public JExpression wrap( JExpression exp ) {
        return JExpr._new(boxify()).arg(exp);
    }

    /**
     * Do the opposite of the wrap method.
     *
     * REVISIT: it's not clear how this method works for VOID.
     */
    public JExpression unwrap( JExpression exp ) {
        // it just so happens that the unwrap method is always
        // things like "intValue" or "booleanValue".
        return exp.invoke(typeName+"Value");
    }

    public void generate(JFormatter f) {
        f.p(typeName);
    }
}