ConstantPoolEntry.java

/*
 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
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 */

class ConstantPoolEntry {
    private int index;
    private String value;

    public ConstantPoolEntry(int index) {
        this.index = index;
        value = null;
    }

    public ConstantPoolEntry(String value) {
        this.index = -1;
        this.value = value;
    }

    public String getValue() throws IllegalStateException {
        if (index != -1) {
            throw new IllegalStateException();
        }
        return value;
    }

    public int getNameIndex() throws IllegalStateException {
        if (value != null) {
            throw new IllegalStateException();
        }
        return index;
    }

    public int getClassIndex() throws IllegalStateException {
        if (value != null) {
            throw new IllegalStateException();
        }
        return index;
    }
}