ElementListOwner.java

package org.kefirsf.bb.conf;

import java.util.Collections;
import java.util.List;

/**
 * Base abstract class for pattern and template configuration classes.
 *
 * @author kefir
 */
abstract class ElementListOwner<T> {
    /**
     * Collection of elements PatternElement or TemplateElement
     */
    private List<? extends T> elements;

    /**
     * The default constructor.
     */
    protected ElementListOwner() {
        elements = Collections.<T>emptyList();
    }

    /**
     * @param elements pattern or template elements.
     */
    protected ElementListOwner(List<? extends T> elements) {
        this.elements = Collections.unmodifiableList(elements);
    }

    /**
     * Get pattern elements
     *
     * @return elements list
     */
    public List<? extends T> getElements() {
        return elements;
    }

    /**
     * Set pattern elements
     *
     * @param elements elements list
     */
    public void setElements(List<? extends T> elements) {
        this.elements = Collections.unmodifiableList(elements);
    }

    public boolean isEmpty() {
        return elements == null || elements.isEmpty();
    }
}