SafeArray.java

/*
 * Copyright (c) 2012 On-Site.com.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.
 *
 * 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
 * for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this work. If not, see <http://www.gnu.org/licenses/>.
 *
 * Linking this library statically or dynamically with other modules is
 * making a combined work based on this library. Thus, the terms and
 * conditions of the GNU General Public License cover the whole combination.
 *
 * As a special exception, the copyright holders of this library give you
 * permission to link this library with independent modules to produce an
 * executable, regardless of the license terms of these independent modules,
 * and to copy and distribute the resulting executable under terms of your
 * choice, provided that you also meet, for each linked independent module,
 * the terms and conditions of the license of that module. An independent
 * module is a module which is not derived from or based on this library.
 * If you modify this library, you may extend this exception to your
 * version of the library, but you are not obligated to do so. If you do
 * not wish to do so, delete this exception statement from your version.
 */

package com.sun.tools.hat.internal.lang.common;

import java.util.Arrays;
import java.util.Collections;

import com.sun.tools.hat.internal.model.JavaObjectArray;
import com.sun.tools.hat.internal.model.JavaThing;

/**
 * A {@link JavaObjectArray} with all actual nulls replaced by null
 * things.
 *
 * @author Chris K. Jester-Young
 */
public class SafeArray {
    public final JavaObjectArray array;
    private final JavaThing nullThing;

    public SafeArray(JavaObjectArray array, JavaThing nullThing) {
        this.array = array;
        this.nullThing = nullThing;
    }

    public JavaThing[] getElements() {
        JavaThing[] elements = array.getElements();
        Collections.replaceAll(Arrays.asList(elements), null, nullThing);
        return elements;
    }

    @Override
    public boolean equals(Object obj) {
        return obj instanceof SafeArray && array.equals(((SafeArray) obj).array);
    }

    @Override
    public int hashCode() {
        return array.hashCode();
    }
}