xml/impl/src/com/intellij/psi/impl/source/resolve/reference/impl/providers/CreateXmlElementIntentionAction.java

/*
 * 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.psi.impl.source.resolve.reference.impl.providers;

import com.intellij.codeInsight.FileModificationService;
import com.intellij.codeInsight.intention.IntentionAction;
import com.intellij.codeInsight.template.Template;
import com.intellij.codeInsight.template.TemplateManager;
import com.intellij.openapi.editor.Editor;
import com.intellij.openapi.fileEditor.FileEditorManager;
import com.intellij.openapi.fileEditor.OpenFileDescriptor;
import com.intellij.openapi.project.Project;
import com.intellij.psi.PsiFile;
import com.intellij.psi.util.PsiTreeUtil;
import com.intellij.psi.xml.XmlFile;
import com.intellij.psi.xml.XmlTag;
import com.intellij.util.IncorrectOperationException;
import com.intellij.xml.XmlBundle;
import com.intellij.xml.impl.schema.XmlNSDescriptorImpl;
import com.intellij.xml.util.XmlUtil;
import org.jetbrains.annotations.NonNls;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.PropertyKey;

class CreateXmlElementIntentionAction implements IntentionAction {
  private final String myMessageKey;
  protected final TypeOrElementOrAttributeReference myRef;
  private boolean myIsAvailableEvaluated;
  private XmlFile myTargetFile;
  private final String myDeclarationTagName;

  CreateXmlElementIntentionAction(
    @PropertyKey(resourceBundle = XmlBundle.PATH_TO_BUNDLE) String messageKey,
    @NonNls @NotNull String declarationTagName,
    TypeOrElementOrAttributeReference ref) {

    myMessageKey = messageKey;
    myRef = ref;
    myDeclarationTagName = declarationTagName;
  }

  @Override
  @NotNull
  public String getText() {
    return XmlBundle.message(myMessageKey, XmlUtil.findLocalNameByQualifiedName(myRef.getCanonicalText()));
  }

  @Override
  @NotNull
  public String getFamilyName() {
    return XmlBundle.message("xml.create.xml.declaration.intention.type");
  }

  @Override
  public boolean isAvailable(@NotNull final Project project, final Editor editor, final PsiFile file) {
    if (!myIsAvailableEvaluated) {
      final XmlTag tag = PsiTreeUtil.getParentOfType(myRef.getElement(), XmlTag.class);
      if (tag != null) {
        final XmlNSDescriptorImpl descriptor = myRef.getDescriptor(tag, myRef.getCanonicalText());

        if (descriptor != null &&
            descriptor.getDescriptorFile() != null &&
            descriptor.getDescriptorFile().isWritable()
           ) {
          myTargetFile = descriptor.getDescriptorFile();
        }
      }
      myIsAvailableEvaluated = true;
    }
    return myTargetFile != null;
  }

  @Override
  public void invoke(@NotNull final Project project, final Editor editor, final PsiFile file) throws IncorrectOperationException {
    if (!FileModificationService.getInstance().prepareFileForWrite(file)) return;

    final XmlTag rootTag = myTargetFile.getDocument().getRootTag();

    OpenFileDescriptor descriptor = new OpenFileDescriptor(
      project,
      myTargetFile.getVirtualFile(),
      rootTag.getValue().getTextRange().getEndOffset()
    );
    Editor targetEditor = FileEditorManager.getInstance(project).openTextEditor(descriptor, true);
    TemplateManager manager = TemplateManager.getInstance(project);
    final Template template = manager.createTemplate("", "");

    addTextTo(template, rootTag);

    manager.startTemplate(targetEditor, template);
  }

  protected void addTextTo(Template template, XmlTag rootTag) {
    String schemaPrefix = rootTag.getPrefixByNamespace(XmlUtil.XML_SCHEMA_URI);
    if (!schemaPrefix.isEmpty()) schemaPrefix += ":";

    template.addTextSegment(
      "<" + schemaPrefix + myDeclarationTagName + " name=\"" + XmlUtil.findLocalNameByQualifiedName(myRef.getCanonicalText()) + "\">"
    );
    template.addEndVariable();
    template.addTextSegment(
      "</" + schemaPrefix + myDeclarationTagName + ">\n"
    );
    template.setToReformat(true);
  }

  @Override
  public boolean startInWriteAction() {
    return true;
  }
}