/*
* $Id: ObjectToHTMLWriter.java 651946 2008-04-27 13:41:38Z apetrelli $
*
* 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 org.apache.struts2.interceptor.debugging;
import java.beans.IntrospectionException;
import java.io.Writer;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import com.opensymphony.xwork2.util.reflection.ReflectionException;
import com.opensymphony.xwork2.util.reflection.ReflectionProvider;
/**
* Writes an object as a table, where each field can be expanded if it is an Object/Collection/Array
*
*/
class ObjectToHTMLWriter {
private PrettyPrintWriter prettyWriter;
ObjectToHTMLWriter(Writer writer) {
this.prettyWriter = new PrettyPrintWriter(writer);
this.prettyWriter.setEscape(false);
}
@SuppressWarnings("unchecked")
public void write(ReflectionProvider reflectionProvider, Object root, String expr) throws IntrospectionException,
ReflectionException {
prettyWriter.startNode("table");
prettyWriter.addAttribute("class", "debugTable");
if (root instanceof Map) {
for (Iterator iterator = ((Map) root).entrySet().iterator(); iterator
.hasNext();) {
Map.Entry property = (Map.Entry) iterator.next();
String key = property.getKey().toString();
Object value = property.getValue();
writeProperty(key, value, expr);
}
} else if (root instanceof List) {
List list = (List) root;
for (int i = 0; i < list.size(); i++) {
Object element = list.get(i);
writeProperty(String.valueOf(i), element, expr);
}
} else if (root instanceof Set) {
Set set = (Set) root;
for (Iterator iterator = set.iterator(); iterator.hasNext();) {
writeProperty("", iterator.next(), expr);
}
} else if (root.getClass().isArray()) {
Object[] objects = (Object[]) root;
for (int i = 0; i < objects.length; i++) {
writeProperty(String.valueOf(i), objects[i], expr);
}
} else {
//print properties
Map<String, Object> properties = reflectionProvider.getBeanMap(root);
for (Map.Entry<String, Object> property : properties.entrySet()) {
String name = property.getKey();
Object value = property.getValue();
if ("class".equals(name))
continue;
writeProperty(name, value, expr);
}
}
prettyWriter.endNode();
}
private void writeProperty(String name, Object value, String expr) {
prettyWriter.startNode("tr");
//name cell
prettyWriter.startNode("td");
prettyWriter.addAttribute("class", "nameColumn");
prettyWriter.setValue(name);
prettyWriter.endNode();
//value cell
prettyWriter.startNode("td");
if (value != null) {
//if is is an empty collection or array, don't write a link
if (value != null &&
(isEmptyCollection(value) || isEmptyMap(value) || (value.getClass()
.isArray() && ((Object[]) value).length == 0))) {
prettyWriter.addAttribute("class", "emptyCollection");
prettyWriter.setValue("empty");
} else {
prettyWriter.addAttribute("class", "valueColumn");
writeValue(name, value, expr);
}
} else {
prettyWriter.addAttribute("class", "nullValue");
prettyWriter.setValue("null");
}
prettyWriter.endNode();
//type cell
prettyWriter.startNode("td");
if (value != null) {
prettyWriter.addAttribute("class", "typeColumn");
Class clazz = value.getClass();
prettyWriter.setValue(clazz.getName());
} else {
prettyWriter.addAttribute("class", "nullValue");
prettyWriter.setValue("unknown");
}
prettyWriter.endNode();
//close tr
prettyWriter.endNode();
}
/**
* Some maps, like AttributeMap will throw an exception when isEmpty() is called
*/
private boolean isEmptyMap(Object value) {
try {
return value instanceof Map && ((Map) value).isEmpty();
} catch (Exception e) {
return true;
}
}
/**
* Some collections might throw an exception when isEmpty() is called
*/
private boolean isEmptyCollection(Object value) {
try {
return value instanceof Collection && ((Collection) value).isEmpty();
} catch (Exception e) {
return true;
}
}
private void writeValue(String name, Object value, String expr) {
Class clazz = value.getClass();
if (clazz.isPrimitive() || Number.class.isAssignableFrom(clazz) ||
clazz.equals(String.class) || Boolean.class.equals(clazz)) {
prettyWriter.setValue(String.valueOf(value));
} else {
prettyWriter.startNode("a");
String path = expr.replaceAll("#", "%23") + "[\"" +
name.replaceAll("#", "%23") + "\"]";
prettyWriter.addAttribute("onclick", "expand(this, '" + path + "')");
prettyWriter.addAttribute("href", "javascript://nop/");
prettyWriter.setValue("Expand");
prettyWriter.endNode();
}
}
}
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