/**
* 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.isis.core.unittestsupport.utils;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.Writer;
/**
* Adapted from <tt>groovy.util.IndentPrinter</tt> (published under ASL 2.0).
*/
public class IndentPrinter {
private int indentLevel;
private String indent;
private Writer out;
private final boolean addNewlines;
/**
* Creates an IndentPrinter backed by a PrintWriter pointing to System.out, with an indent of two spaces.
*
* @see #IndentPrinter(Writer, String)
*/
public IndentPrinter() {
this(new PrintWriter(System.out), " ");
}
/**
* Creates an IndentPrinter backed by the supplied Writer, with an indent of two spaces.
*
* @param out Writer to output to
* @see #IndentPrinter(Writer, String)
*/
public IndentPrinter(Writer out) {
this(out, " ");
}
/**
* Creates an IndentPrinter backed by the supplied Writer,
* with a user-supplied String to be used for indenting.
*
* @param out Writer to output to
* @param indent character(s) used to indent each line
*/
public IndentPrinter(Writer out, String indent) {
this(out, indent, true);
}
/**
* Creates an IndentPrinter backed by the supplied Writer,
* with a user-supplied String to be used for indenting
* and the ability to override newline handling.
*
* @param out Writer to output to
* @param indent character(s) used to indent each line
* @param addNewlines set to false to gobble all new lines (default true)
*/
public IndentPrinter(Writer out, String indent, boolean addNewlines) {
this.addNewlines = addNewlines;
if (out == null) {
throw new IllegalArgumentException("Must specify a Writer");
}
this.out = out;
this.indent = indent;
}
/**
* Prints a string followed by an end of line character.
*
* @param text String to be written
*/
public void println(String text) {
printIndent();
try {
out.write(text);
println();
flush();
} catch(IOException ioe) {
throw new RuntimeException(ioe);
}
}
/**
* Prints a string.
*
* @param text String to be written
*/
public void print(String text) {
try {
out.write(text);
} catch(IOException ioe) {
throw new RuntimeException(ioe);
}
}
/**
* Prints a character.
*
* @param c char to be written
*/
public void print(char c) {
try {
out.write(c);
} catch(IOException ioe) {
throw new RuntimeException(ioe);
}
}
/**
* Prints the current indent level.
*/
public void printIndent() {
for (int i = 0; i < indentLevel; i++) {
try {
out.write(indent);
} catch(IOException ioe) {
throw new RuntimeException(ioe);
}
}
}
/**
* Prints an end-of-line character (if enabled via addNewLines property).
* Defaults to outputting a single '\n' character but by using a custom
* Writer, e.g. PlatformLineWriter, you can get platform-specific
* end-of-line characters.
*
* @see #IndentPrinter(Writer, String, boolean)
*/
public void println() {
if (addNewlines) {
try {
out.write("\n");
} catch(IOException ioe) {
throw new RuntimeException(ioe);
}
}
}
public void incrementIndent() {
++indentLevel;
}
public void decrementIndent() {
--indentLevel;
}
public int getIndentLevel() {
return indentLevel;
}
public void setIndentLevel(int indentLevel) {
this.indentLevel = indentLevel;
}
public void flush() {
try {
out.flush();
} catch(IOException ioe) {
throw new RuntimeException(ioe);
}
}
}