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/*******************************************************************************
* Copyright (c) 2015, 2016 Google, Inc and others.
* 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
*
* Contributors:
* Stefan Xenos (Google) - Initial implementation
*******************************************************************************/
package org.eclipse.jdt.internal.core.nd.java;
import java.util.List;
import java.util.function.Supplier;
import org.eclipse.jdt.internal.core.nd.DatabaseRef;
import org.eclipse.jdt.internal.core.nd.IReader;
import org.eclipse.jdt.internal.core.nd.Nd;
/**
* Holds a reference to an NdType that can be retained while releasing and reacquiring a read lock.
*/
public final class TypeRef implements Supplier<NdType> {
final DatabaseRef<NdType> ref;
final char[] fileName;
final char[] fieldDescriptor;
final TypeSupplier typeSupplier = new TypeSupplier();
private final class TypeSupplier implements Supplier<NdType> {
public TypeSupplier() {
}
@Override
public NdType get() {
NdTypeId typeId = JavaIndex.getIndex(TypeRef.this.ref.getNd()).findType(TypeRef.this.fieldDescriptor);
if (typeId == null) {
return null;
}
List<NdType> implementations = typeId.getTypes();
for (NdType next : implementations) {
NdResourceFile nextResourceFile = next.getResourceFile();
if (nextResourceFile.getLocation().compare(TypeRef.this.fileName, false) == 0) {
if (nextResourceFile.isDoneIndexing()) {
return next;
}
}
}
return null;
}
}
private TypeRef(NdType type) {
super();
this.fieldDescriptor = type.getTypeId().getRawType().getFieldDescriptor().getChars();
this.fileName = type.getResourceFile().getLocation().getChars();
this.ref = new DatabaseRef<NdType>(type.getNd(), this.typeSupplier, type);
}
private TypeRef(Nd nd, char[] resourcePath, char[] fieldDescriptor) {
super();
this.fieldDescriptor = fieldDescriptor;
this.fileName = resourcePath;
this.ref = new DatabaseRef<NdType>(nd, this.typeSupplier);
}
public char[] getFieldDescriptor() {
return this.fieldDescriptor;
}
public char[] getFileName() {
return this.fileName;
}
/**
* Creates a {@link DatabaseRef} to the given {@link NdType}.
*/
public static TypeRef create(NdType type) {
return new TypeRef(type);
}
/**
* Creates a {@link DatabaseRef} to the {@link NdType} with the given resource path and field descriptor.
*/
public static TypeRef create(Nd nd, char[] resourcePath, char[] fieldDescriptor) {
return new TypeRef(nd, resourcePath, fieldDescriptor);
}
public IReader lock() {
return this.ref.lock();
}
@Override
public NdType get() {
return this.ref.get();
}
}
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