StoredSortedValueSet.java

/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 2000-2005
 *      Sleepycat Software.  All rights reserved.
 *
 * $Id: StoredSortedValueSet.java,v 12.2 2005/10/05 20:40:10 mark Exp $
 */

package com.sleepycat.collections;

import java.util.Comparator;
import java.util.SortedSet;

import com.sleepycat.bind.EntityBinding;
import com.sleepycat.db.Database;

public class StoredSortedValueSet extends StoredValueSet implements SortedSet {

    /*
     * No valueBinding ctor is possible since key cannot be derived.
     */

    public StoredSortedValueSet(Database database,
                                EntityBinding valueEntityBinding,
                                boolean writeAllowed) {

        super(new DataView(database, null, null, valueEntityBinding,
                           writeAllowed, null));
        checkKeyDerivation();
    }

    StoredSortedValueSet(DataView valueSetView) {

        super(valueSetView);
        checkKeyDerivation();
    }

    private void checkKeyDerivation() {

        if (!view.canDeriveKeyFromValue()) {
            throw new IllegalArgumentException("Cannot derive key from value");
        }
    }

    public Comparator comparator() {

        return null;
    }

    public Object first() {

        return getFirstOrLast(true);
    }

    public Object last() {

        return getFirstOrLast(false);
    }

    public SortedSet headSet(Object toValue) {

        return subSet(null, false, toValue, false);
    }

    public SortedSet headSet(Object toValue, boolean toInclusive) {

        return subSet(null, false, toValue, toInclusive);
    }

    public SortedSet tailSet(Object fromValue) {

        return subSet(fromValue, true, null, false);
    }

    public SortedSet tailSet(Object fromValue, boolean fromInclusive) {

        return subSet(fromValue, fromInclusive, null, false);
    }

    public SortedSet subSet(Object fromValue, Object toValue) {

        return subSet(fromValue, true, toValue, false);
    }

    public SortedSet subSet(Object fromValue, boolean fromInclusive,
                            Object toValue, boolean toInclusive) {

        try {
            return new StoredSortedValueSet(
               view.subView(fromValue, fromInclusive, toValue, toInclusive,
                            null));
        } catch (Exception e) {
            throw StoredContainer.convertException(e);
        }
    }
}

---