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/*******************************************************************************
* Copyright (c) 2005, 2008 Oracle. All rights reserved.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0, which accompanies this distribution
* and is available at http://www.eclipse.org/legal/epl-v10.html.
*
* Contributors:
* Oracle - initial API and implementation
******************************************************************************/
package org.eclipse.jpt.utility.internal;
import java.io.PrintWriter;
import java.io.Writer;
/**
* Extend PrintWriter to automatically indent new lines.
*/
public class IndentingPrintWriter extends PrintWriter {
private final String indent;
private int indentLevel;
private boolean needsIndent;
public static String DEFAULT_INDENT = "\t";
/**
* Construct a writer that indents with tabs.
*/
public IndentingPrintWriter(Writer out) {
this(out, DEFAULT_INDENT);
}
/**
* Construct a writer that indents with the specified string.
*/
public IndentingPrintWriter(Writer out, String indent) {
super(out);
this.indent = indent;
this.indentLevel = 0;
this.needsIndent = true;
}
/**
* Set flag so following line is indented.
*/
@Override
public void println() {
synchronized (this.lock) {
super.println();
this.needsIndent = true;
}
}
/**
* Print the appropriate indent.
*/
private void printIndent() {
if (this.needsIndent) {
this.needsIndent = false;
for (int i = this.indentLevel; i-- > 0; ) {
this.print(this.indent);
}
}
}
/**
* Write a portion of an array of characters.
*/
@Override
public void write(char buf[], int off, int len) {
synchronized (this.lock) {
this.printIndent();
super.write(buf, off, len);
}
}
/**
* Write a single character.
*/
@Override
public void write(int c) {
synchronized (this.lock) {
this.printIndent();
super.write(c);
}
}
/**
* Write a portion of a string.
*/
@Override
public void write(String s, int off, int len) {
synchronized (this.lock) {
this.printIndent();
super.write(s, off, len);
}
}
/**
* Bump the indent level.
*/
public void indent() {
this.incrementIndentLevel();
}
/**
* Decrement the indent level.
*/
public void undent() {
this.decrementIndentLevel();
}
/**
* Bump the indent level.
*/
public void incrementIndentLevel() {
synchronized (this.lock) {
this.indentLevel++;
}
}
/**
* Decrement the indent level.
*/
public void decrementIndentLevel() {
synchronized (this.lock) {
this.indentLevel--;
}
}
/**
* Return the current indent level.
*/
public int indentLevel() {
return this.indentLevel;
}
/**
* Allow the indent level to be set directly.
*/
public void setIndentLevel(int indentLevel) {
synchronized (this.lock) {
this.indentLevel = indentLevel;
}
}
}
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