| /******************************************************************************* |
| * Copyright (c) 2000, 2003 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 |
| *******************************************************************************/ |
| package org.eclipse.swt.dnd; |
| |
| import org.eclipse.swt.internal.ole.win32.*; |
| |
| final class OleEnumFORMATETC { |
| |
| private COMObject iUnknown; |
| private COMObject iEnumFORMATETC; |
| |
| private int refCount; |
| private int index; |
| |
| private FORMATETC[] formats; |
| |
| OleEnumFORMATETC() { |
| |
| createCOMInterfaces(); |
| |
| } |
| int AddRef() { |
| refCount++; |
| return refCount; |
| } |
| private void createCOMInterfaces() { |
| // register each of the interfaces that this object implements |
| iUnknown = new COMObject(new int[] {2, 0, 0}){ |
| public int method0(int[] args) {return QueryInterface(args[0], args[1]);} |
| public int method1(int[] args) {return AddRef();} |
| public int method2(int[] args) {return Release();} |
| }; |
| iEnumFORMATETC = new COMObject(new int[] {2, 0, 0, 3, 1, 0, 1}){ |
| public int method0(int[] args) {return QueryInterface(args[0], args[1]);} |
| public int method1(int[] args) {return AddRef();} |
| public int method2(int[] args) {return Release();} |
| public int method3(int[] args) {return Next(args[0], args[1], args[2]);} |
| public int method4(int[] args) {return Skip(args[0]);} |
| public int method5(int[] args) {return Reset();} |
| // method6 Clone - not implemented |
| }; |
| } |
| private void disposeCOMInterfaces() { |
| |
| if (iUnknown != null) |
| iUnknown.dispose(); |
| iUnknown = null; |
| |
| if (iEnumFORMATETC != null) |
| iEnumFORMATETC.dispose(); |
| iEnumFORMATETC = null; |
| } |
| int getAddress() { |
| return iEnumFORMATETC.getAddress(); |
| } |
| private FORMATETC[] getNextItems(int numItems){ |
| |
| if (formats == null || numItems < 1) return null; |
| |
| int endIndex = index + numItems - 1; |
| if (endIndex > (formats.length - 1)) endIndex = formats.length - 1; |
| if (index > endIndex) return null; |
| |
| FORMATETC[] items = new FORMATETC[endIndex - index + 1]; |
| for (int i = 0; i < items.length; i++){ |
| items[i] = formats[index]; |
| index++; |
| } |
| |
| return items; |
| } |
| private int Next(int celt, int rgelt, int pceltFetched) { |
| /* Retrieves the next celt items in the enumeration sequence. |
| If there are fewer than the requested number of elements left in the sequence, |
| it retrieves the remaining elements. |
| The number of elements actually retrieved is returned through pceltFetched |
| (unless the caller passed in NULL for that parameter). |
| */ |
| |
| if (rgelt == 0) return COM.E_INVALIDARG; |
| if (pceltFetched == 0 && celt != 1) return COM.E_INVALIDARG; |
| |
| FORMATETC[] nextItems = getNextItems(celt); |
| if (nextItems != null) { |
| for (int i = 0; i < nextItems.length; i++) { |
| COM.MoveMemory(rgelt + i*FORMATETC.sizeof, nextItems[i], FORMATETC.sizeof); |
| } |
| |
| if (pceltFetched != 0) |
| COM.MoveMemory(pceltFetched, new int[] {nextItems.length}, 4); |
| |
| if (nextItems.length == celt) return COM.S_OK; |
| |
| } else { |
| if (pceltFetched != 0) |
| COM.MoveMemory(pceltFetched, new int[] {0}, 4); |
| COM.MoveMemory(rgelt, new FORMATETC(), FORMATETC.sizeof); |
| |
| } |
| return COM.S_FALSE; |
| } |
| private int QueryInterface(int riid, int ppvObject) { |
| |
| if (riid == 0 || ppvObject == 0) return COM.E_NOINTERFACE; |
| |
| GUID guid = new GUID(); |
| COM.MoveMemory(guid, riid, GUID.sizeof); |
| |
| if (COM.IsEqualGUID(guid, COM.IIDIUnknown)) { |
| COM.MoveMemory(ppvObject, new int[] {iUnknown.getAddress()}, 4); |
| AddRef(); |
| return COM.S_OK; |
| } |
| if (COM.IsEqualGUID(guid, COM.IIDIEnumFORMATETC)) { |
| COM.MoveMemory(ppvObject, new int[] {iEnumFORMATETC.getAddress()}, 4); |
| AddRef(); |
| return COM.S_OK; |
| } |
| COM.MoveMemory(ppvObject, new int[] {0}, 4); |
| return COM.E_NOINTERFACE; |
| } |
| int Release() { |
| refCount--; |
| |
| if (refCount == 0) { |
| disposeCOMInterfaces(); |
| COM.CoFreeUnusedLibraries(); |
| } |
| |
| return refCount; |
| } |
| private int Reset() { |
| //Resets the enumeration sequence to the beginning. |
| index = 0; |
| return COM.S_OK; |
| } |
| void setFormats(FORMATETC[] newFormats) { |
| formats = newFormats; |
| index = 0; |
| } |
| private int Skip(int celt) { |
| //Skips over the next specified number of elements in the enumeration sequence. |
| if (celt < 1 ) return COM.E_INVALIDARG; |
| |
| index += celt; |
| if (index > (formats.length - 1)){ |
| index = formats.length - 1; |
| return COM.S_FALSE; |
| } |
| return COM.S_OK; |
| } |
| } |