/*******************************************************************************
* 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 org.eclipse.jdt.annotation.NonNull;
import org.eclipse.jdt.annotation.Nullable;
import org.eclipse.ocl.pivot.library.AbstractSimpleTernaryOperation;
import org.eclipse.ocl.pivot.messages.PivotMessages;
import org.eclipse.ocl.pivot.utilities.StringUtil;
import org.eclipse.ocl.pivot.values.InvalidValueException;
/**
* StringSubstringOperation realises the String::substring() library operation.
*/
public class StringSubstringOperation extends AbstractSimpleTernaryOperation
{
public static final @NonNull StringSubstringOperation INSTANCE = new StringSubstringOperation();
@Override
public @NonNull String evaluate(@Nullable Object sourceValue, @Nullable Object firstArgumentValue, @Nullable Object secondArgumentValue) {
String sourceString = asString(sourceValue);
Integer startInteger = asInteger(firstArgumentValue);
Integer endInteger = asInteger(secondArgumentValue);
int size = sourceString.length();
int lower = startInteger.intValue();
int upper = endInteger.intValue();
if ((0 < lower) && (lower <= upper) && (upper <= size)) {
@NonNull String result = sourceString.substring(lower-1, upper);
return result;
}
else {
throw new InvalidValueException(StringUtil.bind(PivotMessages.IndexesOutOfRange, lower, upper, size));
}
}
}