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TeaVM compiler and SPI
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/*
 *  Copyright 2014 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.dependency;

import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.teavm.diagnostics.Diagnostics;
import org.teavm.model.ClassHolder;
import org.teavm.model.ClassHolderSource;
import org.teavm.model.ClassHolderTransformer;
import org.teavm.model.ClassReader;
import org.teavm.model.ClassReaderSource;
import org.teavm.model.MethodHolder;
import org.teavm.model.util.ModelUtils;
import org.teavm.optimization.UnreachableBasicBlockEliminator;

/**
 *
 * @author Alexey Andreev
 */
class DependencyClassSource implements ClassHolderSource {
    private ClassReaderSource innerSource;
    private Diagnostics diagnostics;
    private Map generatedClasses = new HashMap<>();
    private List transformers = new ArrayList<>();
    private Map cache = new HashMap<>();

    public DependencyClassSource(ClassReaderSource innerSource, Diagnostics diagnostics) {
        this.innerSource = innerSource;
        this.diagnostics = diagnostics;
    }

    @Override
    public ClassHolder get(String name) {
        return cache.computeIfAbsent(name, n -> findAndTransformClass(n));
    }

    public void submit(ClassHolder cls) {
        if (innerSource.get(cls.getName()) != null || generatedClasses.containsKey(cls.getName())) {
            throw new IllegalArgumentException("Class " + cls.getName() + " is already defined");
        }
        generatedClasses.put(cls.getName(), cls);
        for (MethodHolder method : cls.getMethods()) {
            if (method.getProgram() != null && method.getProgram().basicBlockCount() > 0) {
                new UnreachableBasicBlockEliminator().optimize(method.getProgram());
            }
        }
        cache.remove(cls.getName());
    }

    private ClassHolder findAndTransformClass(String name) {
        ClassHolder cls = findClass(name);
        if (cls != null && !transformers.isEmpty()) {
            for (ClassHolderTransformer transformer : transformers) {
                transformer.transformClass(cls, innerSource, diagnostics);
            }
            cls = ModelUtils.copyClass(cls);
        }
        return cls;
    }

    private ClassHolder findClass(String name) {
        ClassReader cls = innerSource.get(name);
        if (cls != null) {
            return ModelUtils.copyClass(cls);
        }
        return generatedClasses.get(name);
    }

    public Collection getGeneratedClasses() {
        return generatedClasses.values();
    }

    public void addTransformer(ClassHolderTransformer transformer) {
        transformers.add(transformer);
    }
}