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Spoon is a tool for meta-programming, analysis and transformation of Java programs.

There is a newer version: 11.1.1-beta-14

/*
 * SPDX-License-Identifier: (MIT OR CECILL-C)
 *
 * Copyright (C) 2006-2023 INRIA and contributors
 *
 * Spoon is available either under the terms of the MIT License (see LICENSE-MIT.txt) or the Cecill-C License (see LICENSE-CECILL-C.txt). You as the user are entitled to choose the terms under which to adopt Spoon.
 */
package spoon.reflect.meta.impl;

import java.util.List;
import java.util.Map;
import java.util.Set;

import spoon.SpoonException;
import spoon.reflect.meta.RoleHandler;
import spoon.reflect.path.CtRole;

/**
 * common implementation of {@link RoleHandler}
 * @param  the type of node whose attribute has to be manipulated
 * @param  the type of container value of the attribute
 * @param  the type of item value of the attribute
 */
abstract class AbstractRoleHandler implements RoleHandler {

	private final CtRole role;
	private final Class targetClass;
	private final Class valueClass;

	@SuppressWarnings({ "unchecked", "rawtypes" })
	protected AbstractRoleHandler(CtRole role, Class targetType, Class valueType) {
		this.role = role;
		this.targetClass = targetType;
		this.valueClass = (Class) valueType;
	}

	@Override
	public CtRole getRole() {
		return role;
	}

	@Override
	public Class getTargetType() {
		return targetClass;
	}


	@SuppressWarnings("unchecked")
	protected T castTarget(Object element) {
		return (T) element;
	}
	@SuppressWarnings("unchecked")
	protected U castValue(Object value) {
		return (U) value;
	}

	protected void checkItemsClass(Iterable iterable) {
		//check that each item has expected class
		for (Object value : iterable) {
			castItemValue(value);
		}
	}
	@SuppressWarnings("unchecked")
	protected V castItemValue(Object value) {
		//check that item has expected class
		if (value != null && !valueClass.isInstance(value)) {
			throw new ClassCastException(value.getClass().getName() + " cannot be cast to " + valueClass.getName());
		}
		return (V) value;
	}

	@Override
	public  void setValue(W element, X value) {
		throw new SpoonException("Setting of CtRole." + role.name() + " is not supported for " + element.getClass().getSimpleName());
	}

	@Override
	public Class getValueClass() {
		return valueClass;
	}

	@Override
	public  List asList(W element) {
		throw new SpoonException("The value of CtRole." + getRole().name() + " cannot be adapted to List for " + element.getClass().getSimpleName());
	}

	@Override
	public  Set asSet(W element) {
		throw new SpoonException("The value of CtRole." + getRole().name() + " cannot be adapted to Set for " + element.getClass().getSimpleName());
	}

	@Override
	public  Map asMap(W element) {
		throw new SpoonException("The value of CtRole." + getRole().name() + " cannot be adapted to Map for " + element.getClass().getSimpleName());
	}

	@Override
	public String toString() {
		return getTargetType().getName() + "#" + getRole().getCamelCaseName();
	}
}