org.codehaus.groovy.control.customizers.builder.InlinedASTCustomizerFactory Maven / Gradle / Ivy

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/*
 * Copyright 2003-2012 the original author or authors.
 *
 * 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.codehaus.groovy.control.customizers.builder;

import groovy.lang.Closure;
import groovy.util.AbstractFactory;
import groovy.util.FactoryBuilderSupport;
import org.codehaus.groovy.control.CompilePhase;
import org.codehaus.groovy.control.customizers.CompilationCustomizer;
import org.codehaus.groovy.runtime.ProxyGeneratorAdapter;

import java.util.HashMap;
import java.util.Map;

/**
 * This factory lets a user define a compilation customizer without having to define
 * an anonymous inner class.
 *
 * Here is an example, which only logs the class name during compilation:
 * inline(phase:'CONVERSION') { source, context, classNode ->
 *       println "visiting $classNode"
 * }
 *
 * @author Cedric Champeau
 * @since 2.1.0
 */
@SuppressWarnings("unchecked")
public class InlinedASTCustomizerFactory extends AbstractFactory implements PostCompletionFactory {

    @Override
    public boolean isHandlesNodeChildren() {
        return true;
    }

    public Object newInstance(final FactoryBuilderSupport builder, final Object name, final Object value, final Map attributes) throws InstantiationException, IllegalAccessException {
        if (attributes.isEmpty() || !attributes.containsKey("phase")) {
            throw new RuntimeException("You must specify a CompilePhase to run at, using the [phase] attribute");
        }
        Map result = new HashMap(1+attributes.size());
        result.putAll(attributes);
        return result;
    }

    @Override
    public boolean onNodeChildren(final FactoryBuilderSupport builder, final Object node, final Closure childContent) {
        if (node instanceof Map) {
            ((Map)node).put("call", childContent.clone());
        }
        return false;
    }

    public Object postCompleteNode(final FactoryBuilderSupport factory, final Object parent, final Object node) {
        if (node instanceof Map) {
            Map map = (Map) node;
            ProxyGeneratorAdapter adapter = new ProxyGeneratorAdapter(
                    map,
                    map.containsKey("superClass")?(Class)map.get("superClass"):CompilationCustomizer.class,
                    map.containsKey("interfaces")?(Class[])map.get("interfaces"):null,
                    this.getClass().getClassLoader(),
                    false,
                    null
            );
            Object phase = map.get("phase");
            if (!(phase instanceof CompilePhase)) {
                phase = CompilePhase.valueOf(phase.toString());
            }
            return adapter.proxy(map, phase);
        }
        return node;
    }
}