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JavaParserTypeSolver.java
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JavaParserTypeSolver.java
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/*
* Copyright 2016 Federico Tomassetti
*
* 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.github.javaparser.symbolsolver.resolution.typesolvers;
import com.github.javaparser.*;
import com.github.javaparser.ast.CompilationUnit;
import com.github.javaparser.resolution.declarations.ResolvedReferenceTypeDeclaration;
import com.github.javaparser.symbolsolver.javaparser.Navigator;
import com.github.javaparser.symbolsolver.javaparsermodel.JavaParserFacade;
import com.github.javaparser.symbolsolver.model.resolution.SymbolReference;
import com.github.javaparser.symbolsolver.model.resolution.TypeSolver;
import com.github.javaparser.utils.Log;
import com.google.common.cache.Cache;
import com.google.common.cache.CacheBuilder;
import java.io.File;
import java.io.FileNotFoundException;
import java.nio.file.Path;
import java.util.ArrayList;
import java.util.List;
import java.util.Optional;
import java.util.concurrent.ExecutionException;
import static com.github.javaparser.ParseStart.*;
import static com.github.javaparser.ParserConfiguration.LanguageLevel.*;
import static com.github.javaparser.Providers.provider;
/**
* Defines a directory containig source code that should be used for solving symbols.
* The directory must correspond to the root package of the files within.
*
* @author Federico Tomassetti
*/
public class JavaParserTypeSolver implements TypeSolver {
private final File srcDir;
private final JavaParser javaParser;
private TypeSolver parent;
private final Cache<String, Optional<CompilationUnit>> parsedFiles = CacheBuilder.newBuilder().softValues().build();
private final Cache<String, List<CompilationUnit>> parsedDirectories = CacheBuilder.newBuilder().softValues().build();
private final Cache<String, SymbolReference<ResolvedReferenceTypeDeclaration>> foundTypes = CacheBuilder.newBuilder().softValues().build();
public JavaParserTypeSolver(Path srcDir) {
this(srcDir.toFile());
}
public JavaParserTypeSolver(String srcDir) {
this(new File(srcDir));
}
public JavaParserTypeSolver(File srcDir) {
if (!srcDir.exists() || !srcDir.isDirectory()) {
throw new IllegalStateException("SrcDir does not exist or is not a directory: " + srcDir.getAbsolutePath());
}
this.srcDir = srcDir;
javaParser = new JavaParser(
new ParserConfiguration()
.setLanguageLevel(BLEEDING_EDGE)
.setAttributeComments(false)
.setStoreTokens(false));
}
@Override
public String toString() {
return "JavaParserTypeSolver{" +
"srcDir=" + srcDir +
", parent=" + parent +
'}';
}
@Override
public TypeSolver getParent() {
return parent;
}
@Override
public void setParent(TypeSolver parent) {
this.parent = parent;
}
private Optional<CompilationUnit> parse(File srcFile) {
try {
return parsedFiles.get(srcFile.getAbsolutePath(), () -> {
try {
if (!srcFile.exists()) {
return Optional.empty();
}
return javaParser.parse(COMPILATION_UNIT, provider(srcFile))
.getResult()
.map(cu -> cu.setStorage(srcFile.toPath()));
} catch (FileNotFoundException e) {
throw new RuntimeException("Issue while parsing while type solving: " + srcFile.getAbsolutePath(), e);
} catch (ParseProblemException e) {
Log.trace("Issue while parsing while type solving: " + srcFile.getAbsolutePath(), e);
return Optional.of((CompilationUnit) e.getResult().getResult().get());
}
});
} catch (ExecutionException e) {
throw new RuntimeException(e);
}
}
private List<CompilationUnit> parseDirectory(File srcDirectory) {
try {
return parsedDirectories.get(srcDirectory.getAbsolutePath(), () -> {
List<CompilationUnit> units = new ArrayList<>();
File[] files = srcDirectory.listFiles();
if (files != null) {
for (File file : files) {
if (file.getName().toLowerCase().endsWith(".java")) {
parse(file).ifPresent(units::add);
}
}
}
return units;
});
} catch (ExecutionException e) {
throw new RuntimeException(e);
}
}
@Override
public SymbolReference<ResolvedReferenceTypeDeclaration> tryToSolveType(String name) {
// TODO support enums
// TODO support interfaces
try {
return foundTypes.get(name, () -> {
SymbolReference<ResolvedReferenceTypeDeclaration> result = tryToSolveTypeUncached(name);
if (result.isSolved()) {
return SymbolReference.solved(result.getCorrespondingDeclaration());
}
return result;
});
} catch (ExecutionException e) {
throw new RuntimeException(e);
}
}
private SymbolReference<ResolvedReferenceTypeDeclaration> tryToSolveTypeUncached(String name) {
String[] nameElements = name.split("\\.");
for (int i = nameElements.length; i > 0; i--) {
StringBuilder filePath = new StringBuilder(srcDir.getAbsolutePath());
for (int j = 0; j < i; j++) {
filePath.append("/")
.append(nameElements[j]);
}
filePath.append(".java");
StringBuilder typeName = new StringBuilder();
for (int j = i - 1; j < nameElements.length; j++) {
if (j != i - 1) {
typeName.append(".");
}
typeName.append(nameElements[j]);
}
File srcFile = new File(filePath.toString());
{
Optional<CompilationUnit> compilationUnit = parse(srcFile);
if (compilationUnit.isPresent()) {
Optional<com.github.javaparser.ast.body.TypeDeclaration<?>> astTypeDeclaration = Navigator.findType(compilationUnit.get(), typeName.toString());
if (astTypeDeclaration.isPresent()) {
return SymbolReference.solved(JavaParserFacade.get(this).getTypeDeclaration(astTypeDeclaration.get()));
}
}
}
{
List<CompilationUnit> compilationUnits = parseDirectory(srcFile.getParentFile());
for (CompilationUnit compilationUnit : compilationUnits) {
Optional<com.github.javaparser.ast.body.TypeDeclaration<?>> astTypeDeclaration = Navigator.findType(compilationUnit, typeName.toString());
if (astTypeDeclaration.isPresent()) {
return SymbolReference.solved(JavaParserFacade.get(this).getTypeDeclaration(astTypeDeclaration.get()));
}
}
}
}
return SymbolReference.unsolved(ResolvedReferenceTypeDeclaration.class);
}
}