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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;
import com.google.common.base.Supplier;
import com.google.common.base.Suppliers;
import com.google.common.collect.ImmutableMap;
import com.google.turbine.binder.bound.ModuleInfo;
import com.google.turbine.binder.bytecode.BytecodeBinder;
import com.google.turbine.binder.bytecode.BytecodeBoundClass;
import com.google.turbine.binder.env.Env;
import com.google.turbine.binder.env.SimpleEnv;
import com.google.turbine.binder.lookup.SimpleTopLevelIndex;
import com.google.turbine.binder.lookup.TopLevelIndex;
import com.google.turbine.binder.sym.ClassSymbol;
import com.google.turbine.binder.sym.ModuleSymbol;
import com.google.turbine.zip.Zip;
import java.io.IOException;
import java.nio.file.Path;
import java.util.Collection;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.function.Function;
import org.checkerframework.checker.nullness.qual.Nullable;
/** Sets up an environment for symbols on the classpath. */
public final class ClassPathBinder {
/**
* The prefix for repackaged transitive dependencies; see {@link
* com.google.turbine.deps.Transitive}.
*/
public static final String TRANSITIVE_PREFIX = "META-INF/TRANSITIVE/";
/** Creates an environment containing symbols in the given classpath. */
public static ClassPath bindClasspath(Collection<Path> paths) throws IOException {
// TODO(cushon): this is going to require an env eventually,
// e.g. to look up type parameters in enclosing declarations
Map<ClassSymbol, BytecodeBoundClass> transitive = new LinkedHashMap<>();
Map<ClassSymbol, BytecodeBoundClass> map = new HashMap<>();
Map<ModuleSymbol, ModuleInfo> modules = new HashMap<>();
Map<String, Supplier<byte[]>> resources = new HashMap<>();
Env<ClassSymbol, BytecodeBoundClass> benv =
new Env<ClassSymbol, BytecodeBoundClass>() {
@Override
public @Nullable BytecodeBoundClass get(ClassSymbol sym) {
return map.get(sym);
}
};
for (Path path : paths) {
try {
bindJar(path, map, modules, benv, transitive, resources);
} catch (IOException e) {
throw new IOException("error reading " + path, e);
}
}
for (Map.Entry<ClassSymbol, BytecodeBoundClass> entry : transitive.entrySet()) {
ClassSymbol symbol = entry.getKey();
map.putIfAbsent(symbol, entry.getValue());
}
SimpleEnv<ClassSymbol, BytecodeBoundClass> env = new SimpleEnv<>(ImmutableMap.copyOf(map));
SimpleEnv<ModuleSymbol, ModuleInfo> moduleEnv = new SimpleEnv<>(ImmutableMap.copyOf(modules));
TopLevelIndex index = SimpleTopLevelIndex.of(env.asMap().keySet());
return new ClassPath() {
@Override
public Env<ClassSymbol, BytecodeBoundClass> env() {
return env;
}
@Override
public Env<ModuleSymbol, ModuleInfo> moduleEnv() {
return moduleEnv;
}
@Override
public TopLevelIndex index() {
return index;
}
@Override
public @Nullable Supplier<byte[]> resource(String path) {
return resources.get(path);
}
};
}
private static void bindJar(
Path path,
Map<ClassSymbol, BytecodeBoundClass> env,
Map<ModuleSymbol, ModuleInfo> modules,
Env<ClassSymbol, BytecodeBoundClass> benv,
Map<ClassSymbol, BytecodeBoundClass> transitive,
Map<String, Supplier<byte[]>> resources)
throws IOException {
// TODO(cushon): don't leak file descriptors
for (Zip.Entry ze : new Zip.ZipIterable(path)) {
String name = ze.name();
if (!name.endsWith(".class")) {
resources.put(name, toByteArrayOrDie(ze));
continue;
}
if (name.startsWith(TRANSITIVE_PREFIX)) {
ClassSymbol sym =
new ClassSymbol(
name.substring(TRANSITIVE_PREFIX.length(), name.length() - ".class".length()));
transitive.computeIfAbsent(
sym,
new Function<ClassSymbol, BytecodeBoundClass>() {
@Override
public BytecodeBoundClass apply(ClassSymbol sym) {
return new BytecodeBoundClass(sym, toByteArrayOrDie(ze), benv, path.toString());
}
});
continue;
}
if (name.substring(name.lastIndexOf('/') + 1).equals("module-info.class")) {
ModuleInfo moduleInfo =
BytecodeBinder.bindModuleInfo(path.toString(), toByteArrayOrDie(ze));
modules.put(new ModuleSymbol(moduleInfo.name()), moduleInfo);
continue;
}
ClassSymbol sym = new ClassSymbol(name.substring(0, name.length() - ".class".length()));
env.putIfAbsent(
sym, new BytecodeBoundClass(sym, toByteArrayOrDie(ze), benv, path.toString()));
}
}
private static Supplier<byte[]> toByteArrayOrDie(Zip.Entry ze) {
return Suppliers.memoize(
new Supplier<byte[]>() {
@Override
public byte[] get() {
return ze.data();
}
});
}
private ClassPathBinder() {}
}
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