/*****************************************************************
* 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.cayenne.util;
import java.util.Collection;
import java.util.Map;
/**
* A utility class to simplify implementation of Object toString methods. This
* implementation is a trimmed version of commons-lang ToStringBuilder.
*
* @since 3.0
*/
public class ToStringBuilder {
protected StringBuilder buffer;
protected Object object;
protected int fieldCount;
public ToStringBuilder(Object object) {
this.object = object;
this.buffer = new StringBuilder(128);
appendClassName();
appendIdentityHashCode();
buffer.append('[');
}
public ToStringBuilder append(String fieldName, Object value) {
if (fieldCount++ > 0) {
buffer.append(',');
}
buffer.append(fieldName).append('=');
if (value == null) {
buffer.append("<null>");
}
else {
appendDetail(value);
}
return this;
}
protected void appendDetail(Object value) {
if (value instanceof Collection) {
buffer.append(value);
}
else if (value instanceof Map) {
buffer.append(value);
}
else if (value instanceof long[]) {
appendArray((long[]) value);
}
else if (value instanceof int[]) {
appendArray((int[]) value);
}
else if (value instanceof short[]) {
appendArray((short[]) value);
}
else if (value instanceof byte[]) {
appendArray((byte[]) value);
}
else if (value instanceof char[]) {
appendArray((char[]) value);
}
else if (value instanceof double[]) {
appendArray((double[]) value);
}
else if (value instanceof float[]) {
appendArray((float[]) value);
}
else if (value instanceof boolean[]) {
appendArray((boolean[]) value);
}
else if (value.getClass().isArray()) {
appendArray((Object[]) value);
}
else {
buffer.append(value);
}
}
protected void appendArray(short[] array) {
buffer.append('{');
for (int i = 0; i < array.length; i++) {
if (i > 0) {
buffer.append(',');
}
buffer.append(array[i]);
}
buffer.append('}');
}
protected void appendArray(int[] array) {
buffer.append('{');
for (int i = 0; i < array.length; i++) {
if (i > 0) {
buffer.append(',');
}
buffer.append(array[i]);
}
buffer.append('}');
}
protected void appendArray(float[] array) {
buffer.append('{');
for (int i = 0; i < array.length; i++) {
if (i > 0) {
buffer.append(',');
}
buffer.append(array[i]);
}
buffer.append('}');
}
protected void appendArray(long[] array) {
buffer.append('{');
for (int i = 0; i < array.length; i++) {
if (i > 0) {
buffer.append(',');
}
buffer.append(array[i]);
}
buffer.append('}');
}
protected void appendArray(byte[] array) {
buffer.append('{');
for (int i = 0; i < array.length; i++) {
if (i > 0) {
buffer.append(',');
}
buffer.append(array[i]);
}
buffer.append('}');
}
protected void appendArray(double[] array) {
buffer.append('{');
for (int i = 0; i < array.length; i++) {
if (i > 0) {
buffer.append(',');
}
buffer.append(array[i]);
}
buffer.append('}');
}
protected void appendArray(char[] array) {
buffer.append('{');
for (int i = 0; i < array.length; i++) {
if (i > 0) {
buffer.append(',');
}
buffer.append(array[i]);
}
buffer.append('}');
}
protected void appendArray(boolean[] array) {
buffer.append('{');
for (int i = 0; i < array.length; i++) {
if (i > 0) {
buffer.append(',');
}
buffer.append(array[i]);
}
buffer.append('}');
}
protected void appendArray(Object[] array) {
buffer.append('{');
for (int i = 0; i < array.length; i++) {
if (i > 0) {
buffer.append(',');
}
appendDetail(array[i]);
}
buffer.append('}');
}
protected void appendClassName() {
if (object != null) {
buffer.append(object.getClass().getName());
}
}
protected void appendIdentityHashCode() {
if (object != null) {
buffer.append('@');
buffer.append(Integer.toHexString(System.identityHashCode(object)));
}
}
/**
* Returns a String built by the earlier invocations.
*/
@Override
public String toString() {
buffer.append(']');
return buffer.toString();
}
}