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With inspiration from other libraries
/*
* 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.commons.lang3.builder;
import org.apache.commons.lang3.ClassUtils;
/**
* Works with {@link ToStringBuilder} to create a "deep" toString.
* But instead a single line like the {@link RecursiveToStringStyle} this creates a multiline String
* similar to the {@link ToStringStyle#MULTI_LINE_STYLE}.
*
* To use this class write code as follows:
*
*
* public class Job {
* String title;
* ...
* }
*
* public class Person {
* String name;
* int age;
* boolean smoker;
* Job job;
*
* ...
*
* public String toString() {
* return new ReflectionToStringBuilder(this, new MultilineRecursiveToStringStyle()).toString();
* }
* }
*
*
*
* This will produce a toString of the format:
* Person@7f54[
* name=Stephen,
* age=29,
* smoker=false,
* job=Job@43cd2[
* title=Manager
* ]
* ]
*
*
*
* @since 3.4
*/
public class MultilineRecursiveToStringStyle extends RecursiveToStringStyle {
/**
* Required for serialization support.
* @see java.io.Serializable
*/
private static final long serialVersionUID = 1L;
/** Indenting of inner lines. */
private static final int INDENT = 2;
/** Current indenting. */
private int spaces = 2;
/**
* Constructor.
*/
public MultilineRecursiveToStringStyle() {
super();
resetIndent();
}
/**
* Resets the fields responsible for the line breaks and indenting.
* Must be invoked after changing the {@link #spaces} value.
*/
private void resetIndent() {
setArrayStart("{" + System.lineSeparator() + spacer(spaces));
setArraySeparator("," + System.lineSeparator() + spacer(spaces));
setArrayEnd(System.lineSeparator() + spacer(spaces - INDENT) + "}");
setContentStart("[" + System.lineSeparator() + spacer(spaces));
setFieldSeparator("," + System.lineSeparator() + spacer(spaces));
setContentEnd(System.lineSeparator() + spacer(spaces - INDENT) + "]");
}
/**
* Creates a StringBuilder responsible for the indenting.
*
* @param spaces how far to indent
* @return a StringBuilder with {spaces} leading space characters.
*/
private StringBuilder spacer(final int spaces) {
final StringBuilder sb = new StringBuilder();
for (int i = 0; i < spaces; i++) {
sb.append(" ");
}
return sb;
}
@Override
public void appendDetail(final StringBuffer buffer, final String fieldName, final Object value) {
if (!ClassUtils.isPrimitiveWrapper(value.getClass()) && !String.class.equals(value.getClass())
&& accept(value.getClass())) {
spaces += INDENT;
resetIndent();
buffer.append(ReflectionToStringBuilder.toString(value, this));
spaces -= INDENT;
resetIndent();
} else {
super.appendDetail(buffer, fieldName, value);
}
}
@Override
protected void appendDetail(final StringBuffer buffer, final String fieldName, final Object[] array) {
spaces += INDENT;
resetIndent();
super.appendDetail(buffer, fieldName, array);
spaces -= INDENT;
resetIndent();
}
@Override
protected void reflectionAppendArrayDetail(final StringBuffer buffer, final String fieldName, final Object array) {
spaces += INDENT;
resetIndent();
super.reflectionAppendArrayDetail(buffer, fieldName, array);
spaces -= INDENT;
resetIndent();
}
@Override
protected void appendDetail(final StringBuffer buffer, final String fieldName, final long[] array) {
spaces += INDENT;
resetIndent();
super.appendDetail(buffer, fieldName, array);
spaces -= INDENT;
resetIndent();
}
@Override
protected void appendDetail(final StringBuffer buffer, final String fieldName, final int[] array) {
spaces += INDENT;
resetIndent();
super.appendDetail(buffer, fieldName, array);
spaces -= INDENT;
resetIndent();
}
@Override
protected void appendDetail(final StringBuffer buffer, final String fieldName, final short[] array) {
spaces += INDENT;
resetIndent();
super.appendDetail(buffer, fieldName, array);
spaces -= INDENT;
resetIndent();
}
@Override
protected void appendDetail(final StringBuffer buffer, final String fieldName, final byte[] array) {
spaces += INDENT;
resetIndent();
super.appendDetail(buffer, fieldName, array);
spaces -= INDENT;
resetIndent();
}
@Override
protected void appendDetail(final StringBuffer buffer, final String fieldName, final char[] array) {
spaces += INDENT;
resetIndent();
super.appendDetail(buffer, fieldName, array);
spaces -= INDENT;
resetIndent();
}
@Override
protected void appendDetail(final StringBuffer buffer, final String fieldName, final double[] array) {
spaces += INDENT;
resetIndent();
super.appendDetail(buffer, fieldName, array);
spaces -= INDENT;
resetIndent();
}
@Override
protected void appendDetail(final StringBuffer buffer, final String fieldName, final float[] array) {
spaces += INDENT;
resetIndent();
super.appendDetail(buffer, fieldName, array);
spaces -= INDENT;
resetIndent();
}
@Override
protected void appendDetail(final StringBuffer buffer, final String fieldName, final boolean[] array) {
spaces += INDENT;
resetIndent();
super.appendDetail(buffer, fieldName, array);
spaces -= INDENT;
resetIndent();
}
}