Java example source code file (Reference.java)

This example Java source code file (Reference.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

element, illegalargumentexception, processingenvironment, reference, typemirror

The Reference.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.tools.internal.xjc.api;

import javax.annotation.processing.ProcessingEnvironment;
import javax.lang.model.element.Element;
import javax.lang.model.element.ExecutableElement;
import javax.lang.model.element.TypeElement;
import javax.lang.model.element.VariableElement;
import javax.lang.model.type.TypeMirror;

/**
 * Reference to a JAXB type (from JAX-RPC.)
 *
 * <p>
 * A reference is a Java type (represented as a {@link javax.lang.model.type.TypeMirror})
 * and a set of annotations (represented as a {@link javax.lang.model.element.Element}).
 * Together they describe a root reference to a JAXB type binding.
 *
 * <p>
 * Those two values can be supplied independently, or you can use
 * other convenience constructors to supply two values at once.
 *
 *
 * @author Kohsuke Kawaguchi
 */
public final class Reference {
    /**
     * The JAXB type being referenced. Must not be null.
     */
    public final TypeMirror type;
    /**
     * The declaration from which annotations for the {@link #type} is read.
     * Must not be null.
     */
    public final Element annotations;

    /**
     * Creates a reference from the return type of the method
     * and annotations on the method.
     */
    public Reference(ExecutableElement method) {
        this(method.getReturnType(),method);
    }

    /**
     * Creates a reference from the parameter type
     * and annotations on the parameter.
     */
    public Reference(VariableElement param) {
        this(param.asType(), param);
    }

    /**
     * Creates a reference from a class declaration and its annotations.
     */
    public Reference(TypeElement type, ProcessingEnvironment env) {
        this(env.getTypeUtils().getDeclaredType(type),type);
    }

    /**
     * Creates a reference by providing two values independently.
     */
    public Reference(TypeMirror type, Element annotations) {
        if(type==null || annotations==null)
            throw new IllegalArgumentException();
        this.type = type;
        this.annotations = annotations;
    }

    public boolean equals(Object o) {
        if (this == o) return true;
        if (!(o instanceof Reference)) return false;

        final Reference that = (Reference) o;

        return annotations.equals(that.annotations) && type.equals(that.type);
    }

    public int hashCode() {
        return 29 * type.hashCode() + annotations.hashCode();
    }
}