/*
* Copyright 2003-2016 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 jetbrains.mps.plugins.runconfigs;
import com.intellij.openapi.project.Project;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiFile;
import com.intellij.psi.impl.FakePsiElement;
import jetbrains.mps.extapi.model.TransientSModel;
import jetbrains.mps.extapi.module.TransientSModule;
import jetbrains.mps.project.MPSProject;
import jetbrains.mps.smodel.ModelAccessHelper;
import jetbrains.mps.util.Computable;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.jetbrains.mps.openapi.model.SModel;
import org.jetbrains.mps.openapi.model.SModelReference;
import org.jetbrains.mps.openapi.model.SNode;
import org.jetbrains.mps.openapi.model.SNodeReference;
import org.jetbrains.mps.openapi.module.SModule;
import org.jetbrains.mps.openapi.module.SModuleReference;
import org.jetbrains.mps.openapi.module.SRepository;
import java.util.List;
import java.util.stream.Collectors;
/**
* FIXME rewrite into several classes instead of this with Object field
*/
public class MPSPsiElement extends FakePsiElement {
private final MPSProject myMPSProject;
private final SRepository myRepository;
private final Object myItem; // AP: always a reference to node, model, module OR simply MPSProject
private final boolean myIsTransientElement;
public MPSPsiElement(SNode node, MPSProject project) {
this(project, node.getReference(), node.getModel() instanceof TransientSModel);
}
public MPSPsiElement(List<SNode> nodes, MPSProject project) {
this(project, nodes.stream().map(key -> key.getReference()).collect(Collectors.toList()), false);
}
public MPSPsiElement(SModel model, MPSProject project) {
this(project, model.getReference(), model instanceof TransientSModel);
}
public MPSPsiElement(SModule module, MPSProject project) {
this(project, module.getModuleReference(), module instanceof TransientSModule);
}
public MPSPsiElement(@NotNull MPSProject project) {
this(project, project, false);
}
private MPSPsiElement(MPSProject project, Object item, boolean isTransient) {
myMPSProject = project;
myRepository = project.getRepository();
myItem = item;
myIsTransientElement = isTransient;
}
/**
* @return <code>true</code> when the MPS object wrapped with this PSI element comes from transient origin (e.g. temporary/transient model)
*/
public boolean isTransientElement() {
return myIsTransientElement;
}
/**
* @return always resolved item
*/
public Object getMPSItem() {
if (myItem instanceof SNodeReference) {
return ((SNodeReference) myItem).resolve(myRepository);
} else if (myItem instanceof List) {
return ((List<SNodeReference>) myItem).stream().map(key -> key.resolve(myRepository)).collect(Collectors.toList());
} else if (myItem instanceof SModelReference) {
return ((SModelReference) myItem).resolve(myRepository);
} else if (myItem instanceof SModuleReference) {
return ((SModuleReference) myItem).resolve(myRepository);
} else if (myItem instanceof MPSProject) {
return myItem;
}
throw new IllegalStateException((myItem == null ?
"null" :
myItem.getClass().getName()
));
}
@NotNull
@Override
public Project getProject() {
return myMPSProject.getProject();
}
@NotNull
public MPSProject getMPSProject() {
return myMPSProject;
}
@Override
public boolean isValid() {
if (myItem instanceof SNode) {
boolean exists = new ModelAccessHelper(myRepository).runReadAction(new Computable<Boolean>() {
@Override
public Boolean compute() {
return ((SNodeReference) myItem).resolve(myRepository) != null;
}
});
return exists;
}
return true;
}
@Override
public PsiFile getContainingFile() {
return null;
}
@Override
public PsiElement getParent() {
if (!((myItem instanceof SNodeReference))) {
return null;
}
return new ModelAccessHelper(myRepository).runReadAction(new Computable<PsiElement>() {
@Override
public PsiElement compute() {
SNodeReference pointer = (SNodeReference) myItem;
SNode node = pointer.resolve(myRepository);
if (node == null) {
return null;
}
SNode parent = node.getParent();
if (parent == null) {
return null;
}
return new MPSPsiElement(parent, myMPSProject);
}
});
}
public static MPSPsiElement createFor(Object o, MPSProject mpsProject) {
if (o instanceof SNode) {
return new MPSPsiElement((SNode) o, mpsProject);
}
if (o instanceof SModel) {
return new MPSPsiElement((SModel) o, mpsProject);
}
if (o instanceof SModule) {
return new MPSPsiElement((SModule) o, mpsProject);
}
if (o instanceof MPSProject) {
if (o != mpsProject) {
throw new IllegalArgumentException("MPSProject must be the same : " + o + " ; mpsProject : " + mpsProject);
}
return new MPSPsiElement(mpsProject);
}
if (MPSPsiElement.isListOf(o, SNode.class)) {
return new MPSPsiElement(((List<SNode>) o), mpsProject);
}
throw new IllegalArgumentException(o.getClass().getName());
}
private static boolean isListOf(Object ol, Class c) {
if (!((ol instanceof List))) {
return false;
}
for (Object o : ((List) ol)) {
if (!(c.isInstance(o))) {
return false;
}
}
return true;
}
/**
* returns the typed UNRESOLVED item if it is of a given type
* as opposed to the {@link #getMPSItem()} the reference types are not resolved
*/
@Nullable
public <T> T getUnresolvedItem(Class<T> itemType) {
if (itemType.isInstance(myItem)) {
return itemType.cast(myItem);
}
return null;
}
}