AStruct.java

// ex: se sts=4 sw=4 expandtab:

/**
 * Yeti core library - structure default implementation.
 *
 * Copyright (c) 2010 Madis Janson
 * 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. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR "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 AUTHOR 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 yeti.lang;

import java.io.Serializable;

public abstract class AStruct implements Struct, Serializable {
    final String[] names;
    private final boolean[] vars;

    public AStruct(String[] names_, boolean[] vars_) {
        names = names_;
        vars = vars_;
    }

    public int count() {
        return names.length;
    }

    public String name(int field) {
        return names[field];
    }

    public String eqName(int field) {
        return names[field];
    }

    public Object ref(int field, int[] index, int at) {
        index[at + 1] = 0;
        if (vars != null && vars[field]) {
            index[at] = field;
            return this;
        }
        index[at] = -1;
        return get(field);
    }

    public void set(String name, Object value) {
        Unsafe.unsafeThrow(new NoSuchFieldException(name));
    }

    public int hashCode() {
        int h = 0;
        for (int i = 0, cnt = count(); i < cnt; ++i) {
            String name = eqName(i);
            if (name != "") {
                Object v = get(i);
                h += name.hashCode() ^ (v == null ? 0 : v.hashCode());
            }
        }
        return h;
    }

    public boolean equals(Object o) {
        Struct st = (Struct) o;
        int acnt = count(), bcnt = st.count(), i = 0, j = 0;
        while (i < acnt && j < bcnt) {
            String an, bn;
            if ((an = eqName(i)) == (bn = st.eqName(j)) && an != "") {
                Object a = get(i);
                Object b = st.get(j);
                if (a != b && (a == null || !a.equals(b)))
                    return false;
            } else {
                int cmp = an.compareTo(bn);
                if (cmp > 0) --i;
                if (cmp < 0) --j;
            }
            ++i;
            ++j;
        }
        return true;
    }

    public String toString() {
        StringBuffer sb = new StringBuffer().append('{');
        for (int cnt = count(), i = 0; i < cnt; ++i) {
            String name = eqName(i);
            if (name != "") {
                if (i != 0)
                    sb.append(", ");
                sb.append(name).append('=').append(Core.show(get(i)));
            }
        }
        sb.append('}');
        return sb.toString();
    }
}