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A packaging of the IntelliJ Community Edition dom-openapi 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.util.xml;

import com.intellij.psi.xml.XmlFile;
import com.intellij.util.ArrayUtil;
import org.jetbrains.annotations.NonNls;
import org.jetbrains.annotations.NotNull;

import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

/**
 * @author peter
 */
public abstract class MergingFileDescription extends DomFileDescription{
  private ModelMerger myMerger;

  protected MergingFileDescription(final Class rootElementClass, @NonNls final String rootTagName) {
    super(rootElementClass, rootTagName);
  }

  @NotNull
  protected abstract Set getFilesToMerge(DomElement element);

  @Override
  @NotNull
  public DomElement getResolveScope(GenericDomValue reference) {
    final DomElement annotation = getScopeFromAnnotation(reference);
    if (annotation != null) return annotation;

    final DomFileElement element = DomUtil.getFileElement(reference);
    return getMergedRoot(element);
  }

  public final T getMergedRoot(DomFileElement element) {
    final DomManager domManager = element.getManager();

    XmlFile xmlFile = element.getFile();
    Set files = new HashSet();
    files.add(xmlFile);
    final XmlFile originalFile = (XmlFile)xmlFile.getOriginalFile();
    if (originalFile != xmlFile) {
      final DomFileElement originalElement = domManager.getFileElement(originalFile);
      if (originalElement != null) {
        element = originalElement;
      }
    }

    files.addAll(getFilesToMerge(element));


    ArrayList roots = new ArrayList(files.size());
    for (XmlFile file: files) {
      final DomFileElement fileElement = domManager.getFileElement(file);
      if (fileElement != null) {
        roots.add(fileElement.getRootElement());
      }
    }

    if (roots.size() == 1) {
      return roots.iterator().next();
    }

    if (myMerger == null) {
      myMerger = DomService.getInstance().createModelMerger();
    }
    return myMerger.mergeModels(getRootElementClass(), roots);
  }

  @Override
  @NotNull
  public DomElement getIdentityScope(DomElement element) {
    final DomElement annotation = getScopeFromAnnotation(element);
    if (annotation != null) return annotation;

    final List methods = DomUtil.getFixedPath(element.getParent());
    if (methods == null) return super.getIdentityScope(element);

    final DomFileElement root = DomUtil.getFileElement(element);
    Object o = getMergedRoot(root);
    for (final JavaMethod method : methods) {
      o = method.invoke(o, ArrayUtil.EMPTY_OBJECT_ARRAY);
    }
    return (DomElement)o;
  }

  @Override
  public boolean isAutomaticHighlightingEnabled() {
    return false;
  }
}