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/*******************************************************************************
* Copyright (c) 2011, 2012 Mia-Software
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Emmanuelle Rouillé (Mia-Software) - Bug 352618 - To be able to use non derived facet structural features and save them values.
* Nicolas Bros (Mia-Software) - Bug 361612 - New core for new version of the Facet metamodel
* Grégoire Dupé (Mia-Software) - Bug 361612 - [Restructuring] New core for new version of the Facet metamodel
* Alban Ménager (Soft-Maint) - Bug 387470 - [EFacet][Custom] Editors
*******************************************************************************/
package org.eclipse.emf.facet.efacet.core.internal;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import org.eclipse.emf.facet.efacet.core.internal.exception.UnmatchingExpectedTypeException;
public final class CastUtils {
private CastUtils() {
//Must no be used.
}
/**
* Cast the given value to a List of the given type
*
* @param value
* the list
* @param expectedType
* the expected type of the list elements
* @param checkType
* whether to check the type of each element in the given list; should be
* <code>true</code> if the list comes from outside the framework, and
* <code>false</code> if the list is managed by the framework (and so already
* checked)
* @return the cast list
* @throws UnmatchingExpectedTypeException
*/
@SuppressWarnings("unchecked")
//@SuppressWarnings("unchecked") The cast is checked by the both if statement.
public static <T> List<T> castToExpectedListType(final Object value, final Class<T> expectedType, final boolean checkType)
throws UnmatchingExpectedTypeException {
List<T> newList = new LinkedList<T>();
if (value instanceof List) {
newList = (List<T>) value;
} else {
newList.add((T) value);
}
final List<T> list = newList;
if (checkType) {
checkTypeOfAllListElements(list, expectedType);
}
return list;
}
@SuppressWarnings("unchecked")
//@SuppressWarnings("unchecked") This method is used to isolate unsafe cast.
public static <T> T castToExpectedType(final Object value, final Class<T> expectedType)
throws UnmatchingExpectedTypeException {
try {
return (T) value;
} catch (ClassCastException e) {
throw new UnmatchingExpectedTypeException("Type mismatch. Expected: " + //$NON-NLS-1$
expectedType.getClass().getName() + ", got " + value.getClass().getName(), e); //$NON-NLS-1$);
}
}
public static void checkTypeOfAllListElements(final List<?> list, final Class<?> expectedType) throws UnmatchingExpectedTypeException {
if (expectedType == null) {
// null means match everything
return;
}
final Iterator<?> iterator = list.iterator();
int index = -1;
while (iterator.hasNext()) {
final Object object = iterator.next();
index++;
if (object != null && !expectedType.isInstance(object)) {
throw new UnmatchingExpectedTypeException("Type mismatch at index " + index, expectedType, object); //$NON-NLS-1$
}
}
}
}
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