com.sap.cloud.security.ams.dcl.client.el.ELInternalTools Maven / Gradle / Ivy

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/************************************************************************
 * © 2019-2024 SAP SE or an SAP affiliate company. All rights reserved. *
 ************************************************************************/
package com.sap.cloud.security.ams.dcl.client.el;

import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.List;

final class ELInternalTools {

    static final Object[] EMPTY_OBJECT_ARRAY = new Object[0];

    private ELInternalTools() {
    }

    //
    //
    static Object[] copyArguments(Object[] args) {
        return args == null || args.length == 0 ? EMPTY_OBJECT_ARRAY : args.clone();
    }

    static Object[] copyArguments(Collection args) {
        return args == null || args.isEmpty() ? EMPTY_OBJECT_ARRAY : args.toArray();
    }

    static Object[] copyArguments(Object[] args, int start, int end) {
        int size = end - start;
        switch (size) {
        case 0:
            return EMPTY_OBJECT_ARRAY;
        case 1:
            return new Object[] { args[start] };
        default:
            return Arrays.copyOfRange(args, start, end, Object[].class);
        }
    }

    //
    //
    //

    static  List createListWithOwnership(U[] list) {
        if (list == null) {
            return Collections.emptyList();
        }
        switch (list.length) {
        case 0:
            return Collections.emptyList();
        case 1:
            return Collections.singletonList(list[0]);
        default:
            return new UnmodifiableArrayList<>(list);
        }
    }

    static  List createFrom(U[] array, Collection list) {
        if (list == null) {
            return Collections.emptyList();
        }
        switch (list.size()) {
        case 0:
            return Collections.emptyList();
        case 1:
            return Collections.singletonList(list instanceof List ? ((List) list).get(0) : list.iterator().next());
        default:
            return new UnmodifiableArrayList<>(list.toArray(array));
        }
    }

}