android/sdk/src/main/java/com/taobao/weex/ui/component/list/template/DomTreeBuilder.java

/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.taobao.weex.ui.component.list.template;

import com.taobao.weex.WXEnvironment;
import com.taobao.weex.WXSDKManager;
import com.taobao.weex.dom.DOMActionContext;
import com.taobao.weex.dom.WXDomObject;
import com.taobao.weex.dom.action.TraceableAction;
import com.taobao.weex.ui.component.WXComponent;
import com.taobao.weex.ui.component.WXComponentFactory;
import com.taobao.weex.ui.component.WXVContainer;
import com.taobao.weex.utils.WXLogUtils;

/**
 * Created by furture on 2017/10/2.
 */

class DomTreeBuilder extends TraceableAction {




    public WXComponent generateComponentTree(DOMActionContext context, WXDomObject dom, WXVContainer parent) {
        if (dom == null) {
            return null;
        }
       long startNanos = System.nanoTime();
        dom.setCloneThis(true);
        WXComponent component = WXComponentFactory.newInstance(context.getInstance(), dom, parent);
        if (component != null) {
            component.mTraceInfo.domThreadStart = dom.mDomThreadTimestamp;
            component.mTraceInfo.rootEventId = mTracingEventId;
            component.mTraceInfo.domQueueTime = mDomQueueTime;
        }
        context.registerComponent(dom.getRef(), component);
        if (component instanceof WXVContainer) {
            WXVContainer container = (WXVContainer) component;
            WXDomObject parentDom = (WXDomObject) container.getDomObject();
            for (int i = 0; i < dom.childCount(); ++i) {
                WXDomObject child = dom.getChild(i);
                if (child != null) {
                    WXComponent childComponent = generateComponentTree(context, child, container);
                    container.addChild(childComponent);
                    WXDomObject childDomObject = (WXDomObject) childComponent.getDomObject();
                    if(childDomObject != child) {
                        int index = parentDom.index(child);
                        parentDom.add(childDomObject, index);
                        if(index >= 0) {
                            parentDom.remove(child);
                            i--;
                        }
                        RuntimeException exception = new IllegalArgumentException(childDomObject.getClass().getName()
                                + " not support clone this");
                        WXLogUtils.e("weex", exception);
                        if(WXEnvironment.isApkDebugable()){
                            throw  exception;
                        }
                    }
                }
            }
        }
        dom.setCloneThis(false);
        if (component != null) {
            component.mTraceInfo.domThreadNanos = System.nanoTime() - startNanos;
        }
        return component;
    }

    public static final WXComponent buildTree(WXDomObject domObject, WXVContainer parent){
        DOMActionContext domActionContext = WXSDKManager.getInstance().getWXDomManager().getDomContext(parent.getInstanceId());
        if(domActionContext == null){
            return null;
        }
        DomTreeBuilder builder = new DomTreeBuilder();
        domObject.traverseTree(
                domActionContext.getAddDOMConsumer(),
                domActionContext.getApplyStyleConsumer()
        );
        return builder.generateComponentTree(domActionContext, domObject, parent);

    }

}