com.google.eclipse.protobuf/src/com/google/eclipse/protobuf/naming/ProtobufQualifiedNameProvider.java

/*
 * Copyright (c) 2011 Google Inc.
 *
 * All rights reserved. This program and the accompanying materials are made available under the terms of the Eclipse
 * Public License v1.0 which accompanies this distribution, and is available at
 *
 * http://www.eclipse.org/legal/epl-v10.html
 */
package com.google.eclipse.protobuf.naming;

import static org.eclipse.xtext.util.Strings.isEmpty;
import static org.eclipse.xtext.util.Tuples.pair;

import java.util.List;

import org.eclipse.emf.ecore.EObject;
import org.eclipse.xtext.naming.*;
import org.eclipse.xtext.util.*;

import com.google.eclipse.protobuf.model.util.*;
import com.google.eclipse.protobuf.protobuf.Package;
import com.google.inject.*;

/**
 * Provides fully-qualified names for protobuf elements.
 *
 * @author alruiz@google.com (Alex Ruiz)
 */
public class ProtobufQualifiedNameProvider extends IQualifiedNameProvider.AbstractImpl implements
    IProtobufQualifiedNameProvider {
  @Inject private final IQualifiedNameConverter converter = new IQualifiedNameConverter.DefaultImpl();
  @Inject private final IResourceScopeCache cache = IResourceScopeCache.NullImpl.INSTANCE;

  @Inject private ModelFinder finder;
  @Inject private NamingStrategies namingStrategies;
  @Inject private Packages packages;
  @Inject private QualifiedNames qualifiedNames;

  @Override public QualifiedName getFullyQualifiedName(EObject e) {
    return getFullyQualifiedName(e, namingStrategies.normal());
  }

  @Override public QualifiedName getFullyQualifiedNameForOption(EObject e) {
    return getFullyQualifiedName(e, namingStrategies.option());
  }

  private QualifiedName getFullyQualifiedName(final EObject e, final NamingStrategy naming) {
    Pair<EObject, String> key = pair(e, "fqn");
    return cache.get(key, e.eResource(), new Provider<QualifiedName>() {
      @Override public QualifiedName get() {
        EObject current = e;
        String name = naming.nameOf(e);
        if (isEmpty(name)) {
          return null;
        }
        QualifiedName qualifiedName = converter.toQualifiedName(name);
        while (current.eContainer() != null) {
          current = current.eContainer();
          QualifiedName parentsQualifiedName = getFullyQualifiedName(current, naming);
          if (parentsQualifiedName != null) { return parentsQualifiedName.append(qualifiedName); }
        }
        return addPackage(e, qualifiedName);
      }
    });
  }

  private QualifiedName addPackage(EObject obj, QualifiedName qualifiedName) {
    if (qualifiedName == null || obj instanceof Package) {
      return qualifiedName;
    }
    Package p = finder.packageOf(obj);
    if (p == null) {
      return qualifiedName;
    }
    List<String> segments = packages.segmentsOf(p);
    if (segments.isEmpty()) {
      return qualifiedName;
    }
    QualifiedName packageQualifiedName = qualifiedNames.createFqn(segments);
    if (qualifiedName.startsWith(packageQualifiedName)) {
      return qualifiedName;
    }
    return packageQualifiedName.append(qualifiedName);
  }
}