Fix #8843, recover Servlet Page API (#8884)

dubbo-compatible/src/main/java/com/alibaba/dubbo/container/page/Menu.java

@@ -0,0 +1,39 @@
+/*
+ * 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.alibaba.dubbo.container.page;
+
+import java.lang.annotation.Documented;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * Menu
+ */
+@Documented
+@Retention(RetentionPolicy.RUNTIME)
+@Target({ElementType.TYPE})
+public @interface Menu {
+
+    String name();
+
+    String desc() default "";
+
+    int order() default 0;
+
+}

dubbo-compatible/src/main/java/com/alibaba/dubbo/container/page/MenuComparator.java

@@ -0,0 +1,44 @@
+/*
+ * 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.alibaba.dubbo.container.page;
+
+import java.io.Serializable;
+import java.util.Comparator;
+
+/**
+ * MenuComparator
+ */
+public class MenuComparator implements Comparator<PageHandler>, Serializable {
+
+    private static final long serialVersionUID = -3161526932904414029L;
+
+    @Override
+    public int compare(PageHandler o1, PageHandler o2) {
+        if (o1 == null && o2 == null) {
+            return 0;
+        }
+        if (o1 == null) {
+            return -1;
+        }
+        if (o2 == null) {
+            return 1;
+        }
+        return o1.equals(o2) ? 0 : (o1.getClass().getAnnotation(Menu.class).order()
+                > o2.getClass().getAnnotation(Menu.class).order() ? 1 : -1);
+    }
+
+}

dubbo-compatible/src/main/java/com/alibaba/dubbo/container/page/Page.java

@@ -0,0 +1,82 @@
+/*
+ * 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.alibaba.dubbo.container.page;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+/**
+ * Page
+ */
+public class Page {
+
+    private final String navigation;
+
+    private final String title;
+
+    private final List<String> columns;
+
+    private final List<List<String>> rows;
+
+    public Page(String navigation) {
+        this(navigation, (String) null, (String[]) null, (List<List<String>>) null);
+    }
+
+    public Page(String navigation, String title,
+                String column, String row) {
+        this(navigation, title, column == null ? null : Arrays.asList(new String[]{column}), row == null ? null : stringToList(row));
+    }
+
+    public Page(String navigation, String title,
+                String[] columns, List<List<String>> rows) {
+        this(navigation, title, columns == null ? null : Arrays.asList(columns), rows);
+    }
+
+    public Page(String navigation, String title,
+                List<String> columns, List<List<String>> rows) {
+        this.navigation = navigation;
+        this.title = title;
+        this.columns = columns;
+        this.rows = rows;
+    }
+
+    private static List<List<String>> stringToList(String str) {
+        List<List<String>> rows = new ArrayList<List<String>>();
+        List<String> row = new ArrayList<String>();
+        row.add(str);
+        rows.add(row);
+        return rows;
+    }
+
+    public String getNavigation() {
+        return navigation;
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public List<String> getColumns() {
+        return columns;
+    }
+
+    public List<List<String>> getRows() {
+        return rows;
+    }
+
+}

dubbo-compatible/src/main/java/com/alibaba/dubbo/container/page/PageHandler.java

@@ -0,0 +1,38 @@
+/*
+ * 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.alibaba.dubbo.container.page;
+
+
+import org.apache.dubbo.common.extension.SPI;
+
+import com.alibaba.dubbo.common.URL;
+
+/**
+ * PageHandler
+ */
+@SPI
+public interface PageHandler {
+
+    /**
+     * Handle the page.
+     *
+     * @param url
+     * @return the page.
+     */
+    Page handle(URL url);
+
+}