groovy/src/main/org/codehaus/groovy/vmplugin/v5/Java5.java

/*
 * Copyright 2003-2007 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.vmplugin.v5;

import java.lang.reflect.*;

import org.codehaus.groovy.GroovyBugError;
import org.codehaus.groovy.ast.ClassNode;
import org.codehaus.groovy.ast.GenericsType;
import org.codehaus.groovy.vmplugin.VMPluging;
import org.codehaus.groovy.ast.ClassHelper;

/**
 * java 5 based functions
 * @author Jochen Theodorou
 *
 */
public class Java5 implements VMPluging {

    public void setGenericsTypes(ClassNode cn) {
        TypeVariable[] tvs = cn.getTypeClass().getTypeParameters();
        GenericsType[] gts = configureTypeVariable(tvs);
        cn.setGenericsTypes(gts);
        Object a = Enum.class;
    }
    
    private GenericsType[] configureTypeVariable(TypeVariable[] tvs) {
        if (tvs.length==0) return null;
        GenericsType[] gts = new GenericsType[tvs.length];
        for (int i = 0; i < tvs.length; i++) {
            gts[i] = configureTypeVariableDefintion(tvs[i]);
        }
        return gts;
    }
    
    private GenericsType configureTypeVariableDefintion(TypeVariable tv) {
       ClassNode base = configureTypeVariableReference(tv);
       Type[] tBounds = tv.getBounds();
       if (tBounds.length==0) return new GenericsType(base);
       ClassNode[] cBounds = new ClassNode[tBounds.length];
       for (int i = 0; i < tBounds.length; i++) {
           cBounds[i] = configureType(tBounds[i]);
       }
       GenericsType gt = new GenericsType(base,cBounds,null);
       gt.setPlaceholder(true);
       return gt;
    }
    
    private ClassNode configureType(Type type) {
        if (type instanceof WildcardType) {
            return configureWildcardType((WildcardType) type);
        } else if (type instanceof ParameterizedType) {
            return configureParameterizedType((ParameterizedType) type);
        } else if (type instanceof GenericArrayType) {
            throw new GroovyBugError("Not yet implemented");
        } else if (type instanceof TypeVariable) {
            return configureTypeVariableReference((TypeVariable) type);
        } else if (type instanceof Class) {
            return ClassHelper.makeWithoutCaching((Class) type, false);
        } else {
            throw new GroovyBugError("unknown type: " + type + " := " + type.getClass());
        }        
    }
    
    private ClassNode configureWildcardType(WildcardType wildcardType) {
        throw new GroovyBugError("Not yet implemented");
    }
    
    private ClassNode configureParameterizedType(ParameterizedType parameterizedType) {
        ClassNode base = configureType(parameterizedType.getRawType());
        GenericsType[] gts = configureTypeArguments(parameterizedType.getActualTypeArguments());
        base.setGenericsTypes(gts);
        return base;
    }
    
    private ClassNode configureTypeVariableReference(TypeVariable tv) {
        ClassNode cn = ClassHelper.makeWithoutCaching(tv.getName());
        cn.setGenericsPlaceHolder(true);
        return cn;
    }
    
    private GenericsType[] configureTypeArguments(Type[] ta) {
        if (ta.length==0) return null;
        GenericsType[] gts = new GenericsType[ta.length];
        for (int i = 0; i < ta.length; i++) {
            gts[i] = new GenericsType(configureType(ta[i]));
        }
        return gts;
    }

}