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/*
* Copyright 2002-2016 the original author or authors.
*
* 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
*
* https://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.springframework.core.style;
import org.springframework.util.Assert;
/**
* Utility class that builds pretty-printing {@code toString()} methods
* with pluggable styling conventions. By default, ToStringCreator adheres
* to Spring's {@code toString()} styling conventions.
*
* @author Keith Donald
* @author Juergen Hoeller
* @since 1.2.2
*/
public class ToStringCreator {
/**
* Default ToStringStyler instance used by this ToStringCreator.
*/
private static final ToStringStyler DEFAULT_TO_STRING_STYLER =
new DefaultToStringStyler(StylerUtils.DEFAULT_VALUE_STYLER);
private final StringBuilder buffer = new StringBuilder(256);
private final ToStringStyler styler;
private final Object object;
private boolean styledFirstField;
/**
* Create a ToStringCreator for the given object.
* @param obj the object to be stringified
*/
public ToStringCreator(Object obj) {
this(obj, (ToStringStyler) null);
}
/**
* Create a ToStringCreator for the given object, using the provided style.
* @param obj the object to be stringified
* @param styler the ValueStyler encapsulating pretty-print instructions
*/
public ToStringCreator(Object obj, ValueStyler styler) {
this(obj, new DefaultToStringStyler(styler != null ? styler : StylerUtils.DEFAULT_VALUE_STYLER));
}
/**
* Create a ToStringCreator for the given object, using the provided style.
* @param obj the object to be stringified
* @param styler the ToStringStyler encapsulating pretty-print instructions
*/
public ToStringCreator(Object obj, ToStringStyler styler) {
Assert.notNull(obj, "The object to be styled must not be null");
this.object = obj;
this.styler = (styler != null ? styler : DEFAULT_TO_STRING_STYLER);
this.styler.styleStart(this.buffer, this.object);
}
/**
* Append a byte field value.
* @param fieldName the name of the field, usually the member variable name
* @param value the field value
* @return this, to support call-chaining
*/
public ToStringCreator append(String fieldName, byte value) {
return append(fieldName, Byte.valueOf(value));
}
/**
* Append a short field value.
* @param fieldName the name of the field, usually the member variable name
* @param value the field value
* @return this, to support call-chaining
*/
public ToStringCreator append(String fieldName, short value) {
return append(fieldName, Short.valueOf(value));
}
/**
* Append a integer field value.
* @param fieldName the name of the field, usually the member variable name
* @param value the field value
* @return this, to support call-chaining
*/
public ToStringCreator append(String fieldName, int value) {
return append(fieldName, Integer.valueOf(value));
}
/**
* Append a long field value.
* @param fieldName the name of the field, usually the member variable name
* @param value the field value
* @return this, to support call-chaining
*/
public ToStringCreator append(String fieldName, long value) {
return append(fieldName, Long.valueOf(value));
}
/**
* Append a float field value.
* @param fieldName the name of the field, usually the member variable name
* @param value the field value
* @return this, to support call-chaining
*/
public ToStringCreator append(String fieldName, float value) {
return append(fieldName, Float.valueOf(value));
}
/**
* Append a double field value.
* @param fieldName the name of the field, usually the member variable name
* @param value the field value
* @return this, to support call-chaining
*/
public ToStringCreator append(String fieldName, double value) {
return append(fieldName, Double.valueOf(value));
}
/**
* Append a boolean field value.
* @param fieldName the name of the field, usually the member variable name
* @param value the field value
* @return this, to support call-chaining
*/
public ToStringCreator append(String fieldName, boolean value) {
return append(fieldName, Boolean.valueOf(value));
}
/**
* Append a field value.
* @param fieldName the name of the field, usually the member variable name
* @param value the field value
* @return this, to support call-chaining
*/
public ToStringCreator append(String fieldName, Object value) {
printFieldSeparatorIfNecessary();
this.styler.styleField(this.buffer, fieldName, value);
return this;
}
private void printFieldSeparatorIfNecessary() {
if (this.styledFirstField) {
this.styler.styleFieldSeparator(this.buffer);
}
else {
this.styledFirstField = true;
}
}
/**
* Append the provided value.
* @param value The value to append
* @return this, to support call-chaining.
*/
public ToStringCreator append(Object value) {
this.styler.styleValue(this.buffer, value);
return this;
}
/**
* Return the String representation that this ToStringCreator built.
*/
@Override
public String toString() {
this.styler.styleEnd(this.buffer, this.object);
return this.buffer.toString();
}
}
