platform/platform-impl/src/com/intellij/openapi/diff/impl/external/BaseExternalTool.java

/*
 * 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.diff.impl.external;

import com.intellij.execution.ExecutionException;
import com.intellij.execution.configurations.GeneralCommandLine;
import com.intellij.execution.util.ExecutionErrorDialog;
import com.intellij.openapi.Disposable;
import com.intellij.openapi.diff.*;
import com.intellij.openapi.editor.Document;
import com.intellij.openapi.fileEditor.FileDocumentManager;
import com.intellij.openapi.util.text.StringUtil;
import com.intellij.openapi.vfs.VirtualFile;
import com.intellij.util.config.AbstractProperty;
import com.intellij.util.config.BooleanProperty;
import com.intellij.util.config.StringProperty;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import java.awt.*;
import java.util.ArrayList;
import java.util.List;

/**
 * @author Konstantin Bulenkov
 */
abstract class BaseExternalTool implements DiffTool {
  private final BooleanProperty myEnableProperty;
  private final StringProperty myToolProperty;

  protected BaseExternalTool(BooleanProperty enableProperty, StringProperty toolProperty) {
    myEnableProperty = enableProperty;
    myToolProperty = toolProperty;
  }

  public final boolean canShow(@NotNull DiffRequest request) {
    if (!isEnabled() || StringUtil.isEmpty(getToolPath())) return false;
    return isAvailable(request);
  }

  @Override
  public DiffViewer createComponent(String title, DiffRequest request, Window window, @NotNull Disposable parentDisposable) {
    return null;
  }

  public abstract boolean isAvailable(@NotNull DiffRequest request);

  @Nullable
  protected ContentExternalizer externalize(@NotNull DiffRequest request, final int index) {
    final VirtualFile file = getLocalFile(request.getContents()[index].getFile());

    if (LocalFileExternalizer.canExternalizeAsFile(file)) {
      return LocalFileExternalizer.tryCreate(file);
    }

    return new ExternalToolContentExternalizer(request, index);
  }

  public static AbstractProperty.AbstractPropertyContainer getProperties() {
    return DiffManagerImpl.getInstanceEx().getProperties();
  }

  protected String getToolPath() {
    return myToolProperty.get(getProperties());
  }

  protected boolean isEnabled() {
    return myEnableProperty.value(getProperties());
  }

  @NotNull
  protected List<String> getParameters(@NotNull DiffRequest request) throws Exception {
    final String p1 = convertToPath(request, 0);
    final String p2 = convertToPath(request, 1);
    final List<String> params = new ArrayList<String>();
    if (p1 != null) params.add(p1);
    if (p2 != null) params.add(p2);
    return params;
  }

  public void show(DiffRequest request) {
    saveContents(request);

    GeneralCommandLine commandLine = new GeneralCommandLine();
    commandLine.setExePath(getToolPath());
    try {
      commandLine.addParameters(getParameters(request));
      commandLine.createProcess();
    }
    catch (Exception e) {
      ExecutionErrorDialog.show(new ExecutionException(e.getMessage()),
                                DiffBundle.message("cant.launch.diff.tool.error.message"), request.getProject());
    }
  }

  protected void saveContents(DiffRequest request) {
    for (DiffContent diffContent : request.getContents()) {
      Document document = diffContent.getDocument();
      if (document != null) {
        FileDocumentManager.getInstance().saveDocument(document);
      }
    }
  }

  @Nullable
  protected String convertToPath(DiffRequest request, int index) throws Exception {
    final ContentExternalizer externalize = externalize(request, index);
    return externalize == null ? null : externalize.getContentFile().getAbsolutePath();
  }

  @Nullable
  protected static VirtualFile getLocalFile(VirtualFile file) {
    if (file != null && file.isInLocalFileSystem()) return file;
    return null;
  }
}