/*
 * Copyright 2000-2012 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.vfs.newvfs;

import com.intellij.openapi.application.ApplicationManager;
import com.intellij.openapi.util.ThrowableComputable;
import com.intellij.openapi.vfs.VirtualFile;
import com.intellij.openapi.vfs.VirtualFileWithId;
import com.intellij.openapi.vfs.encoding.EncodingRegistry;
import org.jetbrains.annotations.NonNls;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import java.io.IOException;
import java.util.Collection;

/**
 * @author max
 */
public abstract class NewVirtualFile extends VirtualFile implements VirtualFileWithId {

  @Override
  public boolean isValid() {
    ApplicationManager.getApplication().assertReadAccessAllowed();
    return exists();
  }

  @Override
  @NotNull
  public byte[] contentsToByteArray() throws IOException {
    throw new IOException("Cannot get content of " + this);
  }

  @Override
  @NotNull
  public abstract NewVirtualFileSystem getFileSystem();

  @Override
  public abstract NewVirtualFile getParent();

  @Override
  @Nullable
  public abstract NewVirtualFile getCanonicalFile();

  @Override
  @Nullable
  public abstract NewVirtualFile findChild(@NotNull @NonNls final String name);

  @Nullable
  public abstract NewVirtualFile refreshAndFindChild(@NotNull String name);

  @Nullable
  public abstract NewVirtualFile findChildIfCached(@NotNull String name);


  public abstract void setTimeStamp(final long time) throws IOException;
  
  @NotNull
  public abstract CharSequence getNameSequence();

  @Override
  public abstract int getId();

  @Nullable @Deprecated
  public NewVirtualFile findChildById(int id) {return null;}

  @Nullable @Deprecated
  public NewVirtualFile findChildByIdIfCached(int id) {return null;}

  @Override
  public void refresh(final boolean asynchronous, final boolean recursive, final Runnable postRunnable) {
    RefreshQueue.getInstance().refresh(asynchronous, recursive, postRunnable, this);
  }

  public abstract void setWritable(boolean writable) throws IOException;

  public abstract void markDirty();

  public abstract void markDirtyRecursively();

  public abstract boolean isDirty();

  public abstract void markClean();

  @Override
  public void move(final Object requestor, @NotNull final VirtualFile newParent) throws IOException {
    if (!exists()) {
      throw new IOException("File to move does not exist: " + getPath());
    }

    if (!newParent.exists()) {
      throw new IOException("Destination folder does not exist: " + newParent.getPath());
    }

    if (!newParent.isDirectory()) {
      throw new IOException("Destination is not a folder: " + newParent.getPath());
    }

    final VirtualFile child = newParent.findChild(getName());
    if (child != null) {
      throw new IOException("Destination already exists: " + newParent.getPath() + "/" + getName());
    }

    EncodingRegistry.doActionAndRestoreEncoding(this, new ThrowableComputable<VirtualFile, IOException>() {
      @Override
      public VirtualFile compute() throws IOException {
        getFileSystem().moveFile(requestor, NewVirtualFile.this, newParent);
        return NewVirtualFile.this;
      }
    });
  }

  @NotNull
  public abstract Collection<VirtualFile> getCachedChildren();

  /** iterated children will NOT contain NullVirtualFile.INSTANCE */
  @NotNull
  public abstract Iterable<VirtualFile> iterInDbChildren();

}