Copyright (c) 2008, http://www.snakeyaml.org
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.
/**
 * Copyright (c) 2008, http://www.snakeyaml.org
 *
 * 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.yaml.snakeyaml.introspector;

import java.lang.reflect.Array;
import java.lang.reflect.GenericArrayType;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;

abstract public class GenericProperty extends Property {

    private Type genType;

    public GenericProperty(String name, Class<?> aClass, Type aType) {
        super(name, aClass);
        genType = aType;
        actualClassesChecked = aType == null;
    }

    private boolean actualClassesChecked;
    private Class<?>[] actualClasses;

    public Class<?>[] getActualTypeArguments() { // should we synchronize here ?
        if (!actualClassesChecked) {
            if (genType instanceof ParameterizedType) {
                ParameterizedType parameterizedType = (ParameterizedType) genType;
                Type[] actualTypeArguments = parameterizedType.getActualTypeArguments();
                if (actualTypeArguments.length > 0) {
                    actualClasses = new Class<?>[actualTypeArguments.length];
                    for (int i = 0; i < actualTypeArguments.length; i++) {
                        if (actualTypeArguments[i] instanceof Class<?>) {
                            actualClasses[i] = (Class<?>) actualTypeArguments[i];
                        } else if (actualTypeArguments[i] instanceof ParameterizedType) {
                            actualClasses[i] = (Class<?>) ((ParameterizedType) actualTypeArguments[i])
                                    .getRawType();
                        } else if (actualTypeArguments[i] instanceof GenericArrayType) {
                            Type componentType = ((GenericArrayType) actualTypeArguments[i])
                                    .getGenericComponentType();
                            if (componentType instanceof Class<?>) {
                                actualClasses[i] = Array.newInstance((Class<?>) componentType, 0)
                                        .getClass();
                            } else {
                                actualClasses = null;
                                break;
                            }
                        } else {
                            actualClasses = null;
                            break;
                        }
                    }
                }
            } else if (genType instanceof GenericArrayType) {
                Type componentType = ((GenericArrayType) genType).getGenericComponentType();
                if (componentType instanceof Class<?>) {
                    actualClasses = new Class<?>[] { (Class<?>) componentType };
                }
            } else if (genType instanceof Class<?>) {// XXX this check is only
                                                     // required for IcedTea6
                Class<?> classType = (Class<?>) genType;
                if (classType.isArray()) {
                    actualClasses = new Class<?>[1];
                    actualClasses[0] = getType().getComponentType();
                }
            }
            actualClassesChecked = true;
        }
        return actualClasses;
    }
}