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A packaging of the IntelliJ Community Edition platform-impl library. This is release number 1 of trunk branch 142.
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/*
 * Copyright 2000-2014 JetBrains s.r.o.
 *
 * 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.intellij.openapi.fileEditor.impl;

import com.intellij.openapi.fileEditor.FileEditorProvider;
import com.intellij.openapi.fileEditor.FileEditorState;
import com.intellij.openapi.fileEditor.ex.FileEditorProviderManager;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.util.InvalidDataException;
import com.intellij.openapi.vfs.VirtualFile;
import com.intellij.openapi.vfs.VirtualFileManager;
import com.intellij.util.containers.HashMap;
import org.jdom.Element;
import org.jetbrains.annotations.NonNls;
import org.jetbrains.annotations.NotNull;

import java.util.List;
import java.util.Map;

final class HistoryEntry{
  @NonNls static final String TAG = "entry";
  private static final String FILE_ATTR = "file";
  @NonNls private static final String PROVIDER_ELEMENT = "provider";
  @NonNls private static final String EDITOR_TYPE_ID_ATTR = "editor-type-id";
  @NonNls private static final String SELECTED_ATTR_VALUE = "selected";
  @NonNls private static final String STATE_ELEMENT = "state";

  public final VirtualFile myFile;
  /**
   * can be null when read from XML
   */ 
  public FileEditorProvider mySelectedProvider;
  private final HashMap myProvider2State;

  public HistoryEntry(@NotNull VirtualFile file, @NotNull FileEditorProvider[] providers, @NotNull FileEditorState[] states, @NotNull FileEditorProvider selectedProvider){
    myFile = file;
    myProvider2State = new HashMap();
    mySelectedProvider = selectedProvider;
    for (int i = 0; i < providers.length; i++) {
      putState(providers[i], states[i]);
    }
  }

  public HistoryEntry(@NotNull Project project, @NotNull Element e) throws InvalidDataException {
    myFile = getVirtualFile(e);
    myProvider2State = new HashMap();

    List providers = e.getChildren(PROVIDER_ELEMENT);
    for (final Object provider1 : providers) {
      Element _e = (Element)provider1;

      String typeId = _e.getAttributeValue(EDITOR_TYPE_ID_ATTR);
      FileEditorProvider provider = FileEditorProviderManager.getInstance().getProvider(typeId);
      if (provider == null) {
        continue;
      }
      if (Boolean.valueOf(_e.getAttributeValue(SELECTED_ATTR_VALUE))) {
        mySelectedProvider = provider;
      }

      Element stateElement = _e.getChild(STATE_ELEMENT);
      if (stateElement == null) {
        throw new InvalidDataException();
      }

      FileEditorState state = provider.readState(stateElement, project, myFile);
      putState(provider, state);
    }
  }

  public FileEditorState getState(@NotNull FileEditorProvider provider) {
    return myProvider2State.get(provider);
  }

  public void putState(@NotNull FileEditorProvider provider, @NotNull FileEditorState state) {
    myProvider2State.put(provider, state);
  }

  /**
   * @return element that was added to the element.
   * Returned element has tag {@link #TAG}. Never null.
   */
  public Element writeExternal(Element element, Project project) {
    Element e = new Element(TAG);
    element.addContent(e);
    e.setAttribute(FILE_ATTR, myFile.getUrl());

    for (final Map.Entry entry : myProvider2State.entrySet()) {
      FileEditorProvider provider = entry.getKey();

      Element providerElement = new Element(PROVIDER_ELEMENT);
      if (provider.equals(mySelectedProvider)) {
        providerElement.setAttribute(SELECTED_ATTR_VALUE, Boolean.TRUE.toString());
      }
      providerElement.setAttribute(EDITOR_TYPE_ID_ATTR, provider.getEditorTypeId());
      Element stateElement = new Element(STATE_ELEMENT);
      providerElement.addContent(stateElement);
      provider.writeState(entry.getValue(), project, stateElement);

      e.addContent(providerElement);
    }

    return e;
  }

  @NotNull
  public static VirtualFile getVirtualFile(Element historyElement) throws InvalidDataException {
    if (!historyElement.getName().equals(TAG)) {
      throw new IllegalArgumentException("unexpected tag: " + historyElement);
    }

    String url = historyElement.getAttributeValue(FILE_ATTR);
    VirtualFile file = VirtualFileManager.getInstance().findFileByUrl(url);
    if (file == null){
      throw new InvalidDataException("No file exists: " + url);
    }
    return file;
  }
}