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A packaging of the IntelliJ Community Edition java-impl library. This is release number 1 of trunk branch 142.
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/*
 * Copyright 2000-2015 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.roots.impl;

import com.intellij.openapi.project.Project;
import com.intellij.openapi.projectRoots.JavaSdk;
import com.intellij.openapi.projectRoots.JavaSdkVersion;
import com.intellij.openapi.projectRoots.Sdk;
import com.intellij.openapi.roots.LanguageLevelProjectExtension;
import com.intellij.openapi.roots.ProjectExtension;
import com.intellij.openapi.util.InvalidDataException;
import com.intellij.openapi.util.WriteExternalException;
import com.intellij.pom.java.LanguageLevel;
import org.jdom.Element;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

/**
 * @author anna
 * @since 26-Dec-2007
 */
public class LanguageLevelProjectExtensionImpl extends LanguageLevelProjectExtension {
  private static final String ASSERT_KEYWORD_ATTR = "assert-keyword";
  private static final String JDK_15_ATTR = "jdk-15";
  private static final String LANGUAGE_LEVEL = "languageLevel";
  private static final String DEFAULT_ATTRIBUTE = "default";

  private final Project myProject;
  private LanguageLevel myLanguageLevel = LanguageLevel.JDK_1_6;
  private LanguageLevel myCurrentLevel;

  public LanguageLevelProjectExtensionImpl(final Project project) {
    myProject = project;
    setDefault(project.isDefault() ? true : null);
  }

  public static LanguageLevelProjectExtensionImpl getInstanceImpl(Project project) {
    return (LanguageLevelProjectExtensionImpl)getInstance(project);
  }

  private void readExternal(final Element element) {
    String level = element.getAttributeValue(LANGUAGE_LEVEL);
    if (level == null) {
      myLanguageLevel = migrateFromIdea7(element);
    }
    else {
      myLanguageLevel = LanguageLevel.valueOf(level);
    }
    String aDefault = element.getAttributeValue(DEFAULT_ATTRIBUTE);
    setDefault(aDefault == null ? null : Boolean.parseBoolean(aDefault));
  }

  private static LanguageLevel migrateFromIdea7(Element element) {
    final boolean assertKeyword = Boolean.valueOf(element.getAttributeValue(ASSERT_KEYWORD_ATTR)).booleanValue();
    final boolean jdk15 = Boolean.valueOf(element.getAttributeValue(JDK_15_ATTR)).booleanValue();
    if (jdk15) {
      return LanguageLevel.JDK_1_5;
    }
    else if (assertKeyword) {
      return LanguageLevel.JDK_1_4;
    }
    else {
      return LanguageLevel.JDK_1_3;
    }
  }

  private void writeExternal(final Element element) {
    element.setAttribute(LANGUAGE_LEVEL, myLanguageLevel.name());
    Boolean aBoolean = getDefault();
    if (aBoolean != null) {
      element.setAttribute(DEFAULT_ATTRIBUTE, Boolean.toString(aBoolean));
    }
    writeAttributesForIdea7(element);
  }

  private void writeAttributesForIdea7(Element element) {
    final boolean is14 = LanguageLevel.JDK_1_4.equals(myLanguageLevel);
    final boolean is15 = myLanguageLevel.compareTo(LanguageLevel.JDK_1_5) >= 0;
    element.setAttribute(ASSERT_KEYWORD_ATTR, Boolean.toString(is14 || is15));
    element.setAttribute(JDK_15_ATTR, Boolean.toString(is15));
  }

  @Override
  @NotNull
  public LanguageLevel getLanguageLevel() {
    return myLanguageLevel;
  }

  @Override
  public void setLanguageLevel(@NotNull LanguageLevel languageLevel) {
    if (myLanguageLevel != languageLevel) {
      myLanguageLevel = languageLevel;
      languageLevelsChanged();
    }
  }

  @Override
  public void languageLevelsChanged() {
    if (!myProject.isDefault()) {
      JavaLanguageLevelPusher.pushLanguageLevel(myProject);
    }
  }

  private void projectSdkChanged(@Nullable Sdk sdk) {
    if (isDefault() && sdk != null) {
      JavaSdkVersion version = JavaSdk.getInstance().getVersion(sdk);
      if (version != null) {
        setLanguageLevel(version.getMaxLanguageLevel());
      }
    }
  }

  public void setCurrentLevel(LanguageLevel level) {
    myCurrentLevel = level;
  }

  public LanguageLevel getCurrentLevel() {
    return myCurrentLevel;
  }

  public static class MyProjectExtension extends ProjectExtension {
    private final LanguageLevelProjectExtensionImpl myInstance;

    public MyProjectExtension(final Project project) {
      myInstance = ((LanguageLevelProjectExtensionImpl)getInstance(project));
    }

    @Override
    public void readExternal(final Element element) throws InvalidDataException {
      myInstance.readExternal(element);
    }

    @Override
    public void writeExternal(final Element element) throws WriteExternalException {
      myInstance.writeExternal(element);
    }

    @Override
    public void projectSdkChanged(@Nullable Sdk sdk) {
      myInstance.projectSdkChanged(sdk);
    }
  }
}