| /* |
| * Copyright (C) 2018 The Android Open Source Project |
| * |
| * 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 |
| * |
| * 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 com.android.textclassifier.utils; |
| |
| import com.google.common.base.Preconditions; |
| import com.google.errorprone.annotations.CanIgnoreReturnValue; |
| import java.io.PrintWriter; |
| |
| /** |
| * A print writer that supports indentation. |
| * |
| * @see PrintWriter |
| */ |
| public final class IndentingPrintWriter { |
| static final String SINGLE_INDENT = " "; |
| |
| private final PrintWriter writer; |
| private final StringBuilder indentBuilder = new StringBuilder(); |
| private String currentIndent = ""; |
| |
| public IndentingPrintWriter(PrintWriter writer) { |
| this.writer = Preconditions.checkNotNull(writer); |
| } |
| |
| /** Prints a string. */ |
| @CanIgnoreReturnValue |
| public IndentingPrintWriter println(String string) { |
| writer.print(currentIndent); |
| writer.print(string); |
| writer.println(); |
| return this; |
| } |
| |
| /** Prints a empty line */ |
| @CanIgnoreReturnValue |
| public IndentingPrintWriter println() { |
| writer.println(); |
| return this; |
| } |
| |
| /** Increases indents for subsequent texts. */ |
| @CanIgnoreReturnValue |
| public IndentingPrintWriter increaseIndent() { |
| indentBuilder.append(SINGLE_INDENT); |
| currentIndent = indentBuilder.toString(); |
| return this; |
| } |
| |
| /** Decreases indents for subsequent texts. */ |
| @CanIgnoreReturnValue |
| public IndentingPrintWriter decreaseIndent() { |
| indentBuilder.delete(0, SINGLE_INDENT.length()); |
| currentIndent = indentBuilder.toString(); |
| return this; |
| } |
| |
| /** Prints a key-valued pair. */ |
| @CanIgnoreReturnValue |
| public IndentingPrintWriter printPair(String key, Object value) { |
| println(String.format("%s=%s", key, String.valueOf(value))); |
| return this; |
| } |
| |
| /** Flushes the stream. */ |
| public void flush() { |
| writer.flush(); |
| } |
| } |