litesoft
@ 948
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/* * Copyright 2008 Google Inc. * * Licensed under the Apache License, Version 2.0 (the "License"); you may not * use this file except in compliance with the License. You may obtain a copy of * the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the * License for the specific language governing permissions and limitations under * the License. */ package com.google.gwt.gen2.table.client; import com.google.gwt.user.client.*; import com.google.gwt.user.client.ui.*; import java.util.*; /** * Creates a mapping from elements to their associated ui objects. * * @param <MappedType> the type that the element is mapped to */ public class ElementMapper<MappedType extends UIObject> { private static class FreeNode { int index; ElementMapper.FreeNode next; public FreeNode( int index, ElementMapper.FreeNode next ) { this.index = index; this.next = next; } } private static native void clearIndex( Element elem ) /*-{ elem["__uiObjectID"] = null; }-*/; private static native int getIndex( Element elem ) /*-{ var index = elem["__uiObjectID"]; return (index == null) ? -1 : index; }-*/; private static native void setIndex( Element elem, int index ) /*-{ elem["__uiObjectID"] = index; }-*/; private ElementMapper.FreeNode freeList = null; private final ArrayList<MappedType> uiObjectList = new ArrayList<MappedType>(); /** * Returns the uiObject associated with the given element. * * @param elem uiObject's element * * @return the uiObject */ public MappedType get( Element elem ) { int index = getIndex( elem ); if ( index < 0 ) { return null; } return uiObjectList.get( index ); } /** * Adds the MappedType. * * @param uiObject uiObject to add */ public void put( MappedType uiObject ) { int index; if ( freeList == null ) { index = uiObjectList.size(); uiObjectList.add( uiObject ); } else { index = freeList.index; uiObjectList.set( index, uiObject ); freeList = freeList.next; } setIndex( uiObject.getElement(), index ); } /** * Remove the uiObject associated with the given element. * * @param elem the uiObject's element */ public void removeByElement( Element elem ) { int index = getIndex( elem ); removeImpl( elem, index ); } /** * Creates an iterator of uiObjects. * * @return the iterator */ public Iterator<MappedType> iterator() { return new Iterator() { int lastIndex = -1; int nextIndex = -1; { findNext(); } public boolean hasNext() { return nextIndex < uiObjectList.size(); } public Object next() { if ( !hasNext() ) { throw new NoSuchElementException(); } Object result = uiObjectList.get( nextIndex ); lastIndex = nextIndex; findNext(); return result; } public void remove() { if ( lastIndex < 0 ) { throw new IllegalStateException(); } Widget w = (Widget) uiObjectList.get( lastIndex ); assert (w.getParent() instanceof HTMLTable); w.removeFromParent(); lastIndex = -1; } private void findNext() { while ( ++nextIndex < uiObjectList.size() ) { if ( uiObjectList.get( nextIndex ) != null ) { return; } } } }; } private void removeImpl( Element elem, int index ) { clearIndex( elem ); uiObjectList.set( index, null ); freeList = new FreeNode( index, freeList ); } } |