tec.uom.se.internal.format.l10n.ResourceBundleEnumeration Maven / Gradle / Ivy
/*
* Units of Measurement Implementation for Java SE
* Copyright (c) 2005-2018, Jean-Marie Dautelle, Werner Keil, Otavio Santana.
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions
* and the following disclaimer in the documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of JSR-363 nor the names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package tec.uom.se.internal.format.l10n;
import java.io.Serializable;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.NoSuchElementException;
import java.util.Set;
/**
* Implements an Enumeration that combines elements from a Set and an Enumeration. Used by {@link MultiPropertyResourceBundle}.
*/
class ResourceBundleEnumeration implements Serializable, Enumeration {
/**
* For serialize.
*/
private static final long serialVersionUID = -1259498757256943174L;
private Set set;
private Iterator iterator;
private Enumeration enumeration;
private String next = null;
/**
* Constructor.
*/
public ResourceBundleEnumeration() {
super();
}
/**
* Constructs a resource bundle enumeration.
*
* @param set
* a set providing some elements of the enumeration
* @param enumeration
* an enumeration providing more elements of the enumeration. enumeration may be null.
*/
ResourceBundleEnumeration(Set set, Enumeration enumeration) {
this.set = set;
this.iterator = set.iterator();
this.enumeration = enumeration;
}
public boolean hasMoreElements() {
if (next == null) {
if (iterator.hasNext()) {
next = iterator.next();
} else if (enumeration != null) {
while (next == null && enumeration.hasMoreElements()) {
next = enumeration.nextElement();
if (set.contains(next)) {
next = null;
}
}
}
}
return next != null;
}
public String nextElement() {
if (hasMoreElements()) {
String result = next;
next = null;
return result;
} else {
throw new NoSuchElementException();
}
}
}