plugins/groovy/groovy-psi/src/org/jetbrains/plugins/groovy/lang/resolve/ast/AutoExternalizeContributor.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 org.jetbrains.plugins.groovy.lang.resolve.ast;

import com.intellij.psi.CommonClassNames;
import com.intellij.psi.PsiMethod;
import com.intellij.psi.impl.light.LightMethodBuilder;
import com.intellij.psi.util.InheritanceUtil;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.plugins.groovy.gpp.GppTypeConverter;
import org.jetbrains.plugins.groovy.lang.psi.api.statements.typedef.GrTypeDefinition;
import org.jetbrains.plugins.groovy.lang.psi.impl.PsiImplUtil;
import org.jetbrains.plugins.groovy.lang.psi.util.GroovyCommonClassNames;

import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import java.util.Collection;

/**
 * @author Max Medvedev
 */
public class AutoExternalizeContributor extends AstTransformContributor {

  @Override
  public void collectMethods(@NotNull GrTypeDefinition clazz, @NotNull Collection<PsiMethod> collector) {
    if (!hasGeneratedImplementations(clazz)) return;

    final LightMethodBuilder write = new LightMethodBuilder(clazz.getManager(), "writeExternal");
    write.setContainingClass(clazz);
    write.addParameter("out", ObjectOutput.class.getName());
    write.addException(IOException.class.getName());
    write.setOriginInfo("created by @AutoExternalize");
    collector.add(write);

    final LightMethodBuilder read = new LightMethodBuilder(clazz.getManager(), "readExternal");
    read.setContainingClass(clazz);
    read.addParameter("oin", ObjectInput.class.getName());
    read.setOriginInfo("created by @AutoExternalize");
    collector.add(read);
  }

  private static boolean hasGeneratedImplementations(GrTypeDefinition clazz) {
    if (PsiImplUtil.getAnnotation(clazz, GroovyCommonClassNames.GROOVY_TRANSFORM_AUTO_EXTERNALIZE) != null) {
      return true;
    }
    if (GppTypeConverter.hasTypedContext(clazz)) {
      return InheritanceUtil.isInheritor(clazz, CommonClassNames.JAVA_IO_EXTERNALIZABLE) &&
             clazz.findCodeMethodsByName("readExternal", false).length == 0;
    }
    return false;
  }
}