/*******************************************************************************
 * Copyright (c) 2003, 2007 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
module dwt.browser.SimpleEnumerator;

import dwt.dwthelper.utils;

import dwt.internal.C;
import dwt.internal.mozilla.XPCOM;
import dwt.internal.mozilla.XPCOMObject;
import dwt.internal.mozilla.nsID;
import dwt.internal.mozilla.nsISimpleEnumerator;
import dwt.internal.mozilla.nsISupports;

class SimpleEnumerator {
    XPCOMObject supports;
    XPCOMObject simpleEnumerator;
    int refCount = 0;
    nsISupports[] values;
    int index = 0;

this (nsISupports[] values) {
    this.values = values;
    for (int i = 0; i < values.length; i++) {
        values[i].AddRef ();
    }
    createCOMInterfaces ();
}

int AddRef () {
    refCount++;
    return refCount;
}

void createCOMInterfaces () {
    /* Create each of the interfaces that this object implements */
    supports = new XPCOMObject (new int[] {2, 0, 0}) {
        public int /*long*/ method0 (int /*long*/[] args) {return QueryInterface (args[0], args[1]);}
        public int /*long*/ method1 (int /*long*/[] args) {return AddRef ();}
        public int /*long*/ method2 (int /*long*/[] args) {return Release ();}
    };

    simpleEnumerator = new XPCOMObject (new int[] {2, 0, 0, 1, 1}) {
        public int /*long*/ method0 (int /*long*/[] args) {return QueryInterface (args[0], args[1]);}
        public int /*long*/ method1 (int /*long*/[] args) {return AddRef ();}
        public int /*long*/ method2 (int /*long*/[] args) {return Release ();}
        public int /*long*/ method3 (int /*long*/[] args) {return HasMoreElements (args[0]);}
        public int /*long*/ method4 (int /*long*/[] args) {return GetNext (args[0]);}
    };
}

void disposeCOMInterfaces () {
    if (supports !is null) {
        supports.dispose ();
        supports = null;
    }   
    if (simpleEnumerator !is null) {
        simpleEnumerator.dispose ();
        simpleEnumerator = null;    
    }
    if (values !is null) {
        for (int i = 0; i < values.length; i++) {
            values[i].Release ();
        }
        values = null;
    }
}

int /*long*/ getAddress () {
    return simpleEnumerator.getAddress ();
}

int QueryInterface (int /*long*/ riid, int /*long*/ ppvObject) {
    if (riid is 0 || ppvObject is 0) return XPCOM.NS_ERROR_NO_INTERFACE;
    nsID guid = new nsID ();
    XPCOM.memmove (guid, riid, nsID.sizeof);

    if (guid.Equals (nsISupports.NS_ISUPPORTS_IID)) {
        XPCOM.memmove (ppvObject, new int /*long*/[] {supports.getAddress ()}, C.PTR_SIZEOF);
        AddRef ();
        return XPCOM.NS_OK;
    }
    if (guid.Equals (nsISimpleEnumerator.NS_ISIMPLEENUMERATOR_IID)) {
        XPCOM.memmove (ppvObject, new int /*long*/[] {simpleEnumerator.getAddress ()}, C.PTR_SIZEOF);
        AddRef ();
        return XPCOM.NS_OK;
    }

    XPCOM.memmove (ppvObject, new int /*long*/[] {0}, C.PTR_SIZEOF);
    return XPCOM.NS_ERROR_NO_INTERFACE;
}

int Release () {
    refCount--;
    if (refCount is 0) disposeCOMInterfaces ();
    return refCount;
}

int HasMoreElements (int /*long*/ _retval) {
    bool more = values !is null && index < values.length;
    XPCOM.memmove (_retval, new int[] {more ? 1 : 0}, 4); /*PRBool */
    return XPCOM.NS_OK;
}   
    
int GetNext (int /*long*/ _retval) {
    if (values is null || index is values.length) return XPCOM.NS_ERROR_UNEXPECTED;
    nsISupports value = values[index++];
    value.AddRef ();
    XPCOM.memmove (_retval, new int /*long*/[] {value.getAddress ()}, C.PTR_SIZEOF);
    return XPCOM.NS_OK;
}       
}