plugins/xpath/xpath-lang/src/org/intellij/lang/xpath/xslt/context/XsltContextProviderExtensionBase.java

/*
 * Copyright 2000-2011 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 org.intellij.lang.xpath.xslt.context;

import com.intellij.lang.Language;
import com.intellij.psi.PsiElement;
import com.intellij.psi.util.PsiTreeUtil;
import com.intellij.psi.xml.XmlAttribute;
import com.intellij.psi.xml.XmlElement;
import org.intellij.lang.xpath.XPathFile;
import org.intellij.lang.xpath.context.ContextProvider;
import org.intellij.lang.xpath.context.ContextProviderExtension;
import org.intellij.lang.xpath.xslt.XsltSupport;
import org.jetbrains.annotations.NotNull;

/*
* Created by IntelliJ IDEA.
* User: sweinreuter
* Date: 08.01.11
*/
public abstract class XsltContextProviderExtensionBase extends ContextProviderExtension {
  public boolean accepts(XPathFile file) {
    final PsiElement context = file.getContext();
    if (!(context instanceof XmlElement)) return false;
    final XmlAttribute att = PsiTreeUtil.getParentOfType(context, XmlAttribute.class);
    if (att == null) return false;
    return XsltSupport.isXPathAttribute(att) ? acceptsLanguage(file.getLanguage()) : false;
  }

  protected abstract boolean acceptsLanguage(Language language);

  @NotNull
  public ContextProvider getContextProvider(XPathFile file) {
    final XmlElement xmlElement = (XmlElement)file.getContext();
    assert xmlElement != null;
    return create(xmlElement);
  }

  protected abstract ContextProvider create(XmlElement xmlElement);
}