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XmlObject.java
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// 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.cloud.utils.xmlobject;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import com.cloud.utils.exception.CloudRuntimeException;
import edu.emory.mathcs.backport.java.util.Collections;
public class XmlObject {
private Map<String, Object> elements = new HashMap<String, Object>();
private String text;
private String tag;
XmlObject() {
}
public XmlObject(String tag) {
this.tag = tag;
}
public XmlObject putElement(String key, Object e) {
if (e == null) {
throw new IllegalArgumentException(String.format("element[%s] can not be null", key));
}
Object old = elements.get(key);
if (old == null) {
System.out.println(String.format("no %s, add new", key));
elements.put(key, e);
} else {
if (old instanceof List) {
System.out.println(String.format("already list %s, add", key));
((List)old).add(e);
} else {
System.out.println(String.format("not list list %s, add list", key));
List lst = new ArrayList();
lst.add(old);
lst.add(e);
elements.put(key, lst);
}
}
return this;
}
private Object recurGet(XmlObject obj, Iterator<String> it) {
String key = it.next();
Object e = obj.elements.get(key);
if (e == null) {
return null;
}
if (!it.hasNext()) {
return e;
} else {
if (!(e instanceof XmlObject)) {
throw new CloudRuntimeException(String.format("%s doesn't reference to a XmlObject", it.next()));
}
return recurGet((XmlObject) e, it);
}
}
public <T> T get(String elementStr) {
String[] strs = elementStr.split("\\.");
List<String> lst = new ArrayList<String>(strs.length);
Collections.addAll(lst, strs);
return (T)recurGet(this, lst.iterator());
}
public <T> List<T> getAsList(String elementStr) {
Object e = get(elementStr);
if (e instanceof List) {
return (List<T>)e;
}
List lst = new ArrayList(1);
lst.add(e);
return lst;
}
public String getText() {
return text;
}
public XmlObject setText(String text) {
this.text = text;
return this;
}
public String getTag() {
return tag;
}
public XmlObject setTag(String tag) {
this.tag = tag;
return this;
}
public String dump() {
StringBuilder sb = new StringBuilder();
sb.append("<").append(tag);
List<XmlObject> children = new ArrayList<XmlObject>();
for (Map.Entry<String, Object> e : elements.entrySet()) {
String key = e.getKey();
Object val = e.getValue();
if (val instanceof String) {
sb.append(String.format(" %s=\"%s\"", key, val.toString()));
} else if (val instanceof XmlObject) {
children.add((XmlObject) val);
} else if (val instanceof List) {
children.addAll((Collection<? extends XmlObject>) val);
} else {
throw new CloudRuntimeException(String.format("unsupported element type[tag:%s, class: %s], only allowed type of [String, List<XmlObject>, Object]", key, val.getClass().getName()));
}
}
if (!children.isEmpty() && text != null) {
throw new CloudRuntimeException(String.format("element %s cannot have both text[%s] and child elements", tag, text));
}
if (!children.isEmpty()) {
sb.append(">");
for (XmlObject x : children) {
sb.append(x.dump());
}
sb.append(String.format("</%s>", tag));
} else {
if (text != null) {
sb.append(">");
sb.append(text);
sb.append(String.format("</%s>", tag));
} else {
sb.append(" />");
}
}
return sb.toString();
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder("<" + tag);
for (Map.Entry<String, Object> e : elements.entrySet()) {
String key = e.getKey();
Object value = e.getValue();
if (!(value instanceof String)) {
continue;
}
sb.append(String.format(" %s=\"%s\"", key, value.toString()));
}
if (text == null || "".equals(text.trim())) {
sb.append(" />");
} else {
sb.append(">").append(text).append(String.format("</ %s>", tag));
}
return sb.toString();
}
public <T> T evaluateObject(T obj) {
Class<?> clazz = obj.getClass();
try {
do {
Field[] fs = clazz.getDeclaredFields();
for (Field f : fs) {
f.setAccessible(true);
Object value = get(f.getName());
f.set(obj, value);
}
clazz = clazz.getSuperclass();
} while (clazz != null && clazz != Object.class);
return obj;
} catch (Exception e) {
throw new CloudRuntimeException(e);
}
}
}