io.ballerina.plugins.idea.webview.diagram.split.SplitTextEditorProvider.java Source code

Introduction

Here is the source code for io.ballerina.plugins.idea.webview.diagram.split.SplitTextEditorProvider.java

Source

/*
 *  Copyright (c) 2019, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
 *
 *  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 io.ballerina.plugins.idea.webview.diagram.split;

import com.intellij.openapi.fileEditor.AsyncFileEditorProvider;
import com.intellij.openapi.fileEditor.FileEditor;
import com.intellij.openapi.fileEditor.FileEditorPolicy;
import com.intellij.openapi.fileEditor.FileEditorProvider;
import com.intellij.openapi.fileEditor.FileEditorState;
import com.intellij.openapi.project.DumbAware;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.vfs.VirtualFile;
import org.jdom.Attribute;
import org.jdom.Element;
import org.jetbrains.annotations.NotNull;

/**
 * Split Editor Provider.
 */
public abstract class SplitTextEditorProvider implements AsyncFileEditorProvider, DumbAware {

    private static final String FIRST_EDITOR = "first_editor";
    private static final String SECOND_EDITOR = "second_editor";
    private static final String SPLIT_LAYOUT = "split_layout";

    @NotNull
    protected final FileEditorProvider myFirstProvider;
    @NotNull
    protected final FileEditorProvider mySecondProvider;

    @NotNull
    private final String myEditorTypeId;

    public SplitTextEditorProvider(@NotNull FileEditorProvider firstProvider,
            @NotNull FileEditorProvider secondProvider) {
        myFirstProvider = firstProvider;
        mySecondProvider = secondProvider;

        myEditorTypeId = String.format("split-provider[%s;%s]", myFirstProvider.getEditorTypeId(),
                mySecondProvider.getEditorTypeId());
    }

    @Override
    public boolean accept(@NotNull Project project, @NotNull VirtualFile file) {
        return myFirstProvider.accept(project, file) && mySecondProvider.accept(project, file);
    }

    @NotNull
    @Override
    public FileEditor createEditor(@NotNull Project project, @NotNull VirtualFile file) {
        return createEditorAsync(project, file).build();
    }

    @NotNull
    @Override
    public String getEditorTypeId() {
        return myEditorTypeId;
    }

    @NotNull
    @Override
    public Builder createEditorAsync(@NotNull final Project project, @NotNull final VirtualFile file) {
        final Builder firstBuilder = getBuilderFromEditorProvider(myFirstProvider, project, file);
        final Builder secondBuilder = getBuilderFromEditorProvider(mySecondProvider, project, file);

        return new Builder() {
            @Override
            public FileEditor build() {
                return createSplitEditor(firstBuilder.build(), secondBuilder.build());
            }
        };
    }

    @NotNull
    @Override
    public FileEditorState readState(@NotNull Element sourceElement, @NotNull Project project,
            @NotNull VirtualFile file) {
        Element child = sourceElement.getChild(FIRST_EDITOR);
        FileEditorState firstState = null;
        if (child != null) {
            firstState = myFirstProvider.readState(child, project, file);
        }
        child = sourceElement.getChild(SECOND_EDITOR);
        FileEditorState secondState = null;
        if (child != null) {
            secondState = mySecondProvider.readState(child, project, file);
        }

        final Attribute attribute = sourceElement.getAttribute(SPLIT_LAYOUT);

        final String layoutName;
        if (attribute != null) {
            layoutName = attribute.getValue();
        } else {
            layoutName = null;
        }

        return new SplitFileEditor.MyFileEditorState(layoutName, firstState, secondState);
    }

    @Override
    public void writeState(@NotNull FileEditorState state, @NotNull Project project,
            @NotNull Element targetElement) {
        if (!(state instanceof SplitFileEditor.MyFileEditorState)) {
            return;
        }
        final SplitFileEditor.MyFileEditorState compositeState = (SplitFileEditor.MyFileEditorState) state;

        Element child = new Element(FIRST_EDITOR);
        if (compositeState.getFirstState() != null) {
            myFirstProvider.writeState(compositeState.getFirstState(), project, child);
            targetElement.addContent(child);
        }

        child = new Element(SECOND_EDITOR);
        if (compositeState.getSecondState() != null) {
            mySecondProvider.writeState(compositeState.getSecondState(), project, child);
            targetElement.addContent(child);
        }

        if (compositeState.getSplitLayout() != null) {
            targetElement.setAttribute(SPLIT_LAYOUT, compositeState.getSplitLayout());
        }
    }

    protected abstract FileEditor createSplitEditor(@NotNull FileEditor firstEditor,
            @NotNull FileEditor secondEditor);

    @NotNull
    @Override
    public FileEditorPolicy getPolicy() {
        return FileEditorPolicy.HIDE_DEFAULT_EDITOR;
    }

    @NotNull
    public static Builder getBuilderFromEditorProvider(@NotNull final FileEditorProvider provider,
            @NotNull final Project project, @NotNull final VirtualFile file) {
        if (provider instanceof AsyncFileEditorProvider) {
            return ((AsyncFileEditorProvider) provider).createEditorAsync(project, file);
        } else {
            return new Builder() {
                @Override
                public FileEditor build() {
                    return provider.createEditor(project, file);
                }
            };
        }
    }
}