Add some useful implementations of ClassHolderSource and ResourceReader

core/src/main/java/org/teavm/parsing/ClasspathResourceMapper.java

@@ -62,6 +62,13 @@ public class ClasspathResourceMapper implements Mapper<String, ClassHolder>, Cla
         this.classLoader = classLoader;
     }
 
+    public ClasspathResourceMapper(Properties properties, Mapper<String, ClassHolder> innerMapper) {
+        this.innerMapper = innerMapper;
+        Map<String, Transformation> transformationMap = new HashMap<>();
+        loadProperties(properties, transformationMap);
+        transformations.addAll(transformationMap.values());
+    }
+
     private void loadProperties(Properties properties, Map<String, Transformation> cache) {
         for (String propertyName : properties.stringPropertyNames()) {
             if (propertyName.startsWith(PACKAGE_PREFIX)) {

core/src/main/java/org/teavm/parsing/CompositeClassHolderSource.java

@@ -0,0 +1,45 @@
+/*
+ *  Copyright 2017 Alexey Andreev.
+ *
+ *  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 org.teavm.parsing;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import org.teavm.model.ClassHolder;
+import org.teavm.model.ClassHolderSource;
+
+public class CompositeClassHolderSource implements ClassHolderSource {
+    private List<ClassHolderSource> innerSources;
+    private Map<String, ClassHolder> cache = new HashMap<>();
+
+    public CompositeClassHolderSource(List<ClassHolderSource> innerSources) {
+        this.innerSources = new ArrayList<>(innerSources);
+    }
+
+    @Override
+    public ClassHolder get(String name) {
+        return cache.computeIfAbsent(name, n -> {
+            for (ClassHolderSource innerSource : innerSources) {
+                ClassHolder cls = innerSource.get(n);
+                if (cls != null) {
+                    return cls;
+                }
+            }
+            return null;
+        });
+    }
+}

core/src/main/java/org/teavm/parsing/DirectoryClasspathClassHolderSource.java

@@ -0,0 +1,46 @@
+/*
+ *  Copyright 2017 Alexey Andreev.
+ *
+ *  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 org.teavm.parsing;
+
+import java.io.File;
+import java.util.Properties;
+import org.teavm.model.ClassHolder;
+import org.teavm.model.ClassHolderSource;
+import org.teavm.parsing.resource.DirectoryResourceReader;
+import org.teavm.parsing.resource.MapperClassHolderSource;
+import org.teavm.parsing.resource.ResourceClassHolderMapper;
+
+public class DirectoryClasspathClassHolderSource implements ClassHolderSource {
+    private MapperClassHolderSource innerClassSource;
+    private ClasspathResourceMapper classPathMapper;
+
+    public DirectoryClasspathClassHolderSource(File baseDir, Properties properties) {
+        DirectoryResourceReader reader = new DirectoryResourceReader(baseDir);
+        ResourceClassHolderMapper rawMapper = new ResourceClassHolderMapper(reader);
+        classPathMapper = new ClasspathResourceMapper(properties, rawMapper);
+        innerClassSource = new MapperClassHolderSource(classPathMapper);
+    }
+
+    public DirectoryClasspathClassHolderSource(File baseDir) {
+        this(baseDir, new Properties());
+    }
+
+    @Override
+    public ClassHolder get(String name) {
+        return innerClassSource.get(name);
+    }
+}

core/src/main/java/org/teavm/parsing/resource/DirectoryResourceReader.java

@@ -0,0 +1,39 @@
+/*
+ *  Copyright 2017 Alexey Andreev.
+ *
+ *  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 org.teavm.parsing.resource;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+
+public class DirectoryResourceReader implements ResourceReader {
+    private File baseDir;
+
+    public DirectoryResourceReader(File baseDir) {
+        this.baseDir = baseDir;
+    }
+
+    @Override
+    public boolean hasResource(String name) {
+        return new File(baseDir, name).isFile();
+    }
+
+    @Override
+    public InputStream openResource(String name) throws IOException {
+        return new FileInputStream(new File(baseDir, name));
+    }
+}