/*******************************************************************************
* Copyright (c) 2010, 2014 Willink Transformations and others.
* 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:
* E.D.Willink - Initial API and implementation
*******************************************************************************/
package org.eclipse.ocl.pivot.library.string;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.jdt.annotation.NonNull;
import org.eclipse.jdt.annotation.Nullable;
import org.eclipse.ocl.pivot.ids.CollectionTypeId;
import org.eclipse.ocl.pivot.ids.TypeId;
import org.eclipse.ocl.pivot.library.AbstractSimpleUnaryOperation;
import org.eclipse.ocl.pivot.values.SequenceValue;
/**
* StringCharactersOperation realises the String::characters() library operation.
*/
public class StringCharactersOperation extends AbstractSimpleUnaryOperation
{
public static final @NonNull StringCharactersOperation INSTANCE = new StringCharactersOperation();
public static final @NonNull CollectionTypeId SEQ_STRING = TypeId.SEQUENCE.getSpecializedId(TypeId.STRING);
@Override
public @NonNull SequenceValue evaluate(@Nullable Object sourceVal) {
String sourceString = asString(sourceVal);
List<Object> results = new ArrayList<Object>(sourceString.length());
for (int i = 0; i < sourceString.length(); i++) {
@NonNull String s = sourceString.substring(i, i+1);
results.add(s);
}
return createSequenceValue(SEQ_STRING, results);
}
}