com.rometools.rome.feed.impl.ToStringBean Maven / Gradle / Ivy
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/*
* Copyright 2004 Sun Microsystems, Inc.
*
* 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 com.rometools.rome.feed.impl;
import java.lang.reflect.Array;
import java.lang.reflect.Method;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import java.util.Stack;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Provides deep Bean toString support.
*
* It works on all read/write properties, recursively. It support all primitive types, Strings,
* Collections, ToString objects and multi-dimensional arrays of any of them.
*/
public class ToStringBean {
private static final Logger LOG = LoggerFactory.getLogger(ToStringBean.class);
private static final ThreadLocal> PREFIX_TL = new ThreadLocal>();
private static final Object[] NO_PARAMS = new Object[0];
private ToStringBean() {
}
/**
* Returns the String representation of the bean given in the constructor.
*
* It uses the Class name as the prefix.
*
*
* @return bean object String representation.
*
*/
public static String toString(Class beanClass, Object obj) {
Stack stack = PREFIX_TL.get();
boolean needStackCleanup = false;
if (stack == null) {
stack = new Stack();
PREFIX_TL.set(stack);
needStackCleanup = true;
}
final String[] tsInfo;
if (stack.isEmpty()) {
tsInfo = null;
} else {
tsInfo = stack.peek();
}
final String prefix;
if (tsInfo == null) {
final String className = obj.getClass().getName();
prefix = className.substring(className.lastIndexOf(".") + 1);
} else {
prefix = tsInfo[0];
tsInfo[1] = prefix;
}
final String result = toString(beanClass, obj, prefix);
if (needStackCleanup) {
PREFIX_TL.remove();
}
return result;
}
/**
* Returns the String representation of the bean given in the constructor.
*
*
* @param prefix to use for bean properties.
* @return bean object String representation.
*
*/
private static String toString(final Class beanClass, final Object obj, final String prefix) {
final StringBuffer sb = new StringBuffer(128);
try {
final List propertyDescriptors = BeanIntrospector.getPropertyDescriptorsWithGetters(beanClass);
for (final PropertyDescriptor propertyDescriptor : propertyDescriptors) {
final String propertyName = propertyDescriptor.getName();
final Method getter = propertyDescriptor.getReadMethod();
final Object value = getter.invoke(obj, NO_PARAMS);
printProperty(sb, prefix + "." + propertyName, value);
}
} catch (final Exception e) {
LOG.error("Error while generating toString", e);
final Class clazz = obj.getClass();
final String errorMessage = e.getMessage();
sb.append(String.format("\n\nEXCEPTION: Could not complete %s.toString(): %s\n", clazz, errorMessage));
}
return sb.toString();
}
private static void printProperty(final StringBuffer sb, final String prefix, final Object value) {
if (value == null) {
sb.append(prefix).append("=null\n");
} else if (value.getClass().isArray()) {
printArrayProperty(sb, prefix, value);
} else if (value instanceof Map) {
@SuppressWarnings("unchecked")
final Map map = (Map) value;
final Set> entries = map.entrySet();
if (entries.isEmpty()) {
sb.append(prefix).append("=[]\n");
} else {
for (final Entry entry : entries) {
final Object eKey = entry.getKey();
final Object eValue = entry.getValue();
final String ePrefix = String.format("%s[%s]", prefix, eKey);
final String[] tsInfo = new String[2];
tsInfo[0] = ePrefix;
final Stack stack = PREFIX_TL.get();
stack.push(tsInfo);
final String s;
if (eValue == null) {
s = "null";
} else {
s = eValue.toString();
}
stack.pop();
if (tsInfo[1] == null) {
sb.append(ePrefix).append("=").append(s).append("\n");
} else {
sb.append(s);
}
}
}
} else if (value instanceof Collection) {
@SuppressWarnings("unchecked")
final Collection