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/*
* Copyright 2016 Google Inc. All Rights Reserved.
*
* 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.google.turbine.binder.lookup;
import static com.google.common.collect.Iterables.getLast;
import com.google.common.base.Supplier;
import com.google.common.base.Suppliers;
import com.google.common.collect.ImmutableList;
import com.google.turbine.binder.sym.ClassSymbol;
import com.google.turbine.diag.SourceFile;
import com.google.turbine.diag.TurbineError;
import com.google.turbine.diag.TurbineError.ErrorKind;
import com.google.turbine.tree.Tree;
import com.google.turbine.tree.Tree.ImportDecl;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;
import org.checkerframework.checker.nullness.qual.Nullable;
/** An index for statically imported members, in particular constant variables. */
public class MemberImportIndex {
/** A cache of resolved static imports, keyed by the simple name of the member. */
private final Map<String, Supplier<@Nullable ClassSymbol>> cache = new LinkedHashMap<>();
private final ImmutableList<Supplier<@Nullable ClassSymbol>> classes;
public MemberImportIndex(
SourceFile source,
CanonicalSymbolResolver resolve,
TopLevelIndex tli,
ImmutableList<ImportDecl> imports) {
ImmutableList.Builder<Supplier<@Nullable ClassSymbol>> packageScopes = ImmutableList.builder();
for (ImportDecl i : imports) {
if (!i.stat()) {
continue;
}
if (i.wild()) {
packageScopes.add(
Suppliers.memoize(
new Supplier<@Nullable ClassSymbol>() {
@Override
public @Nullable ClassSymbol get() {
LookupResult result = tli.scope().lookup(new LookupKey(i.type()));
if (result == null) {
return null;
}
ClassSymbol sym = (ClassSymbol) result.sym();
for (Tree.Ident bit : result.remaining()) {
sym = resolveNext(resolve, source, i.position(), sym, bit);
}
return sym;
}
}));
} else {
cache.put(
getLast(i.type()).value(),
Suppliers.memoize(
new Supplier<@Nullable ClassSymbol>() {
@Override
public @Nullable ClassSymbol get() {
LookupResult result = tli.scope().lookup(new LookupKey(i.type()));
if (result == null) {
return null;
}
ClassSymbol sym = (ClassSymbol) result.sym();
for (int i = 0; i < result.remaining().size() - 1; i++) {
if (sym == null) {
return null;
}
sym = resolve.resolveOne(sym, result.remaining().get(i));
}
return sym;
}
}));
}
}
this.classes = packageScopes.build();
}
private static ClassSymbol resolveNext(
CanonicalSymbolResolver resolve,
SourceFile source,
int position,
ClassSymbol sym,
Tree.Ident bit) {
ClassSymbol next = resolve.resolveOne(sym, bit);
if (next == null) {
throw TurbineError.format(
source,
position,
ErrorKind.SYMBOL_NOT_FOUND,
new ClassSymbol(sym.binaryName() + '$' + bit));
}
return next;
}
/** Resolves the owner of a single-member static import of the given simple name. */
public @Nullable ClassSymbol singleMemberImport(String simpleName) {
Supplier<@Nullable ClassSymbol> cachedResult = cache.get(simpleName);
return cachedResult != null ? cachedResult.get() : null;
}
/**
* Returns an iterator over all classes whose members are on-demand imported into the current
* compilation unit.
*/
public Iterator<ClassSymbol> onDemandImports() {
return new WildcardSymbols(classes.iterator());
}
private static class WildcardSymbols implements Iterator<ClassSymbol> {
private final Iterator<Supplier<ClassSymbol>> it;
public WildcardSymbols(Iterator<Supplier<ClassSymbol>> it) {
this.it = it;
}
@Override
public boolean hasNext() {
return it.hasNext();
}
@Override
public ClassSymbol next() {
return it.next().get();
}
@Override
public void remove() {
throw new UnsupportedOperationException("remove");
}
}
}
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