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/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package javax.xml.bind;

import java.io.Serializable;

import javax.xml.namespace.QName;

public class JAXBElement implements Serializable {

    private static final long serialVersionUID = 1L;

    public final static class GlobalScope {
    }

    protected final QName name;
    protected final Class declaredType;
    protected final Class scope;
    protected T value;
    protected boolean nil;

    public JAXBElement(QName name, Class declaredType, Class scope, T value) {
        this.nil = false;
        if (declaredType == null || name == null) {
            throw new IllegalArgumentException();
        }
        this.declaredType = declaredType;
        if (scope == null) {
            scope = GlobalScope.class;
        }
        this.scope = scope;
        this.name = name;
        setValue(value);
    }

    public JAXBElement(QName name, Class declaredType, T value) {
        this(name, declaredType, GlobalScope.class, value);
    }

    public Class getDeclaredType() {
        return declaredType;
    }

    public QName getName() {
        return name;
    }

    public void setValue(T value) {
        this.value = value;
    }

    public T getValue() {
        return value;
    }

    public Class getScope() {
        return scope;
    }

    public boolean isNil() {
        return value == null || nil;
    }

    public void setNil(boolean nil) {
        this.nil = nil;
    }

    public boolean isGlobalScope() {
        return scope == GlobalScope.class;
    }

    public boolean isTypeSubstituted() {
        if (value == null) {
            return false;
        } else {
            return value.getClass() != declaredType;
        }
    }
}