DebugUtil.java

/**
 * Copyright 2011 the original author or authors.
 *
 * 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 org.bricket.web.common.debug;

import org.apache.wicket.Component;
import org.apache.wicket.Component.IVisitor;
import org.apache.wicket.IClusterable;
import org.apache.wicket.Page;
import org.apache.wicket.util.string.Strings;

import java.util.ArrayList;
import java.util.List;

/**
 * @author Ingo Renner
 * @author Henning Teek
 */
public final class DebugUtil {
    private DebugUtil() {
        super();
    }

    private static class ComponentData implements IClusterable {
        private final String path;
        private final String type;
        private String value;
        private final long size;

        ComponentData(String path, String type, long size) {
            this.path = path;
            this.type = type;
            this.size = size;
        }

        @Override
        public String toString() {
            return String.format("ComponentData [path=%s, type=%s, value=%s, size=%s]", path, type, value, size);
        }
    }

    /**
     * Get recursively all components of the page, extract the information
     * relevant for us and add them to a list.
     * 
     * @param page
     * @return List of component data objects
     */
    public static List<ComponentData> getComponentData(final Page page) {
        final List<ComponentData> data = new ArrayList<ComponentData>();

        page.visitChildren(new IVisitor<Component>() {
            public Object component(final Component component) {
                final ComponentData componentData;

                // anonymous class? Get the parent's class name
                String name = component.getClass().getName();
                if (name.indexOf('$') > 0) {
                    name = component.getClass().getSuperclass().getName();
                }

                // remove the path component
                name = Strings.lastPathComponent(name, Component.PATH_SEPARATOR);

                componentData = new ComponentData(component.getPageRelativePath(), name, component.getSizeInBytes());

                try {
                    componentData.value = component.getDefaultModelObjectAsString();
                } catch (Exception e) {
                    componentData.value = e.getMessage();
                }

                data.add(componentData);

                return IVisitor.CONTINUE_TRAVERSAL;
            }
        });
        return data;
    }
}