Java tutorial
/* * Copyright 2016 Igor Maznitsa. * * 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.igormaznitsa.mindmap.plugins.importers; import com.igormaznitsa.mindmap.plugins.api.AbstractImporter; import java.io.File; import java.util.Iterator; import java.util.List; import javax.annotation.Nonnull; import javax.annotation.Nullable; import javax.swing.Icon; import org.apache.commons.io.FileUtils; import com.igormaznitsa.meta.annotation.MustNotContainNull; import com.igormaznitsa.mindmap.model.MindMap; import com.igormaznitsa.mindmap.model.MindMapController; import com.igormaznitsa.mindmap.model.Topic; import com.igormaznitsa.mindmap.swing.panel.DialogProvider; import com.igormaznitsa.mindmap.swing.panel.MindMapPanel; import com.igormaznitsa.mindmap.swing.panel.Texts; import com.igormaznitsa.mindmap.swing.services.IconID; import com.igormaznitsa.mindmap.swing.services.ImageIconServiceProvider; import java.util.ArrayList; import com.igormaznitsa.mindmap.swing.panel.ui.AbstractCollapsableElement; public class Text2MindMapImporter extends AbstractImporter { private static final Icon ICO = ImageIconServiceProvider.findInstance() .getIconForId(IconID.POPUP_IMPORT_TXT2MM); private static final int TAB_POSITIONS = 16; private static final class TopicData { private final int offset; private final Topic topic; public TopicData(final int offset, @Nonnull final Topic topic) { this.offset = offset; this.topic = topic; } } @Override @Nullable public MindMap doImport(@Nonnull final MindMapPanel panel, @Nonnull final DialogProvider dialogProvider, @Nullable final Topic actionTopic, @Nonnull @MustNotContainNull final Topic[] selectedTopics) throws Exception { final File file = this.selectFileForExtension(panel, Texts.getString("MMDImporters.Text2MindMap.openDialogTitle"), "txt", "text files (.TXT)", Texts.getString("MMDImporters.ApproveImport")); MindMap result = null; if (file != null) { final List<String> lines = FileUtils.readLines(file); result = makeFromLines(lines, panel.getModel().getController()); } return result; } @Nonnull MindMap makeFromLines(@Nonnull @MustNotContainNull final List<String> lines, @Nullable final MindMapController controller) { final MindMap result = new MindMap(controller, false); final Iterator<String> iterator = lines.iterator(); final List<TopicData> topicStack = new ArrayList<TopicData>(); while (true) { final Topic topic = decodeLine(result, iterator, topicStack); if (topic == null) { break; } } final Topic root = result.getRoot(); final int size = root == null ? 0 : root.getChildren().size(); if (root != null && size != 0) { final List<Topic> topics = root.getChildren(); final int left = (topics.size() + 1) / 2; for (int i = 0; i < left; i++) { AbstractCollapsableElement.makeTopicLeftSided(topics.get(i), true); } } return result; } @Nullable private String nextNonEmptyString(@Nonnull final Iterator<String> iterator) { String result = null; while (iterator.hasNext()) { result = iterator.next(); if (result.trim().isEmpty()) { result = null; } else { break; } } return result; } private int calcDataOffset(@Nonnull final String text) { int result = 0; for (final char c : text.toCharArray()) { if (c == '\t') { result += TAB_POSITIONS - (result % TAB_POSITIONS); } else if (Character.isWhitespace(c)) { result++; } else { break; } } return result; } @Nullable private Topic findPrevTopicForOffset(@Nonnull @MustNotContainNull final List<TopicData> topicStack, final int detectedOffset) { for (final TopicData d : topicStack) { if (d.offset < detectedOffset) { return d.topic; } } TopicData result = null; if (!topicStack.isEmpty()) { for (final TopicData d : topicStack) { if (result == null) { result = d; } else if (result.offset > d.offset) { result = d; } } } return result == null ? null : result.topic; } @Nullable private Topic decodeLine(@Nonnull final MindMap map, @Nonnull final Iterator<String> lines, @Nonnull @MustNotContainNull final List<TopicData> topicStack) { Topic result = null; final String line = nextNonEmptyString(lines); if (line != null) { final int currentOffset = calcDataOffset(line); final String trimmed = line.trim(); final Topic parentTopic = findPrevTopicForOffset(topicStack, currentOffset); if (parentTopic == null) { result = new Topic(map, null, trimmed); map.setRoot(result, false); } else { result = new Topic(map, parentTopic, trimmed); } topicStack.add(0, new TopicData(currentOffset, result)); } return result; } @Override @Nonnull public String getName(@Nonnull final MindMapPanel panel, @Nullable final Topic actionTopic, @Nonnull @MustNotContainNull final Topic[] selectedTopics) { return Texts.getString("MMDImporters.Text2MindMap.Name"); } @Override @Nonnull public String getReference(@Nonnull final MindMapPanel panel, @Nullable final Topic actionTopic, @Nonnull @MustNotContainNull final Topic[] selectedTopics) { return Texts.getString("MMDImporters.Text2MindMap.Reference"); } @Override @Nonnull public Icon getIcon(@Nonnull final MindMapPanel panel, @Nullable final Topic actionTopic, @Nonnull @MustNotContainNull final Topic[] selectedTopics) { return ICO; } @Override public int getOrder() { return 1; } }