Returns the position of the first occurrence of an object in the given sequence. - Java java.util

Java examples for java.util:List Search

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Description

Returns the position of the first occurrence of an object in the given sequence.

Demo Code

/*******************************************************************************
 * Copyright (c) 2010 SAP AG./*w  ww  . j av  a 2  s. c om*/
 * 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:
 *    Emil Simeonov - initial API and implementation.
 *    Dimitar Donchev - initial API and implementation.
 *    Dimitar Tenev - initial API and implementation.
 *    Nevena Manova - initial API and implementation.
 *    Georgi Konstantinov - initial API and implementation.
 *    Jakob Spies - initial API and implementation.
 *******************************************************************************/
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Set;

public class Main{
    /**
     * Returns the position of the first occurrence of an object in the given sequence.
     * @param objects the sequence to search
     * @param <T> the object type
     * @param criterion the search criterion
     * @return the  position of the first occurrence of the object if it was found, -1 otherwise
     * @pre objects != null
     * @pre criterion != null
     */
    public static <T> int indexOf(final List<? extends T> objects,
            final Condition<T> criterion) {
        Nil.checkNil(objects, "objects"); //$NON-NLS-1$
        Nil.checkNil(criterion, "criterion"); //$NON-NLS-1$

        int found = -1;

        for (int i = 0, n = objects.size(); i < n; ++i) {
            if (criterion.isSatisfied(objects.get(i))) {
                found = i;
                break;
            }
        }

        return found;
    }
}

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