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Powerful multi-pass preprocessor to process directives situated in C-styled commentaries
/*
* Copyright 2002-2019 Igor Maznitsa (http://www.igormaznitsa.com)
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package com.igormaznitsa.meta.common.utils;
import com.igormaznitsa.meta.annotation.MayContainNull;
import com.igormaznitsa.meta.annotation.Weight;
import javax.annotation.Nonnull;
import javax.annotation.concurrent.ThreadSafe;
import java.lang.reflect.Array;
/**
* Set of auxiliary methods to process arrays.
*
* @since 1.0
*/
@ThreadSafe
public final class ArrayUtils {
/**
* Empty object array.
*
* @since 1.0.2
*/
public static final Object[] EMPTY_OBJECT_ARRAY = new Object[0];
/**
* Empty string array.
*
* @since 1.0.2
*/
public static final String[] EMPTY_STRING_ARRAY = new String[0];
/**
* Empty byte array.
*
* @since 1.0.2
*/
public static final byte[] EMPTY_BYTE_ARRAY = new byte[0];
/**
* Empty char array.
*
* @since 1.0.2
*/
public static final char[] EMPTY_CHAR_ARRAY = new char[0];
/**
* Empty short array.
*
* @since 1.0.2
*/
public static final short[] EMPTY_SHORT_ARRAY = new short[0];
/**
* Empty boolean array.
*
* @since 1.0.2
*/
public static final boolean[] EMPTY_BOOL_ARRAY = new boolean[0];
/**
* Empty int array.
*
* @since 1.0.2
*/
public static final int[] EMPTY_INT_ARRAY = new int[0];
/**
* Empty long array.
*
* @since 1.0.2
*/
public static final long[] EMPTY_LONG_ARRAY = new long[0];
private ArrayUtils() {
}
/**
* Join arrays provided as parameters, all arrays must be the same type, null values allowed.
*
* @param type of array
* @param arrays array of arrays to be joined
* @return all joined arrays as single array
* @since 1.0
*/
@SafeVarargs
@Nonnull
@MayContainNull
@Weight(Weight.Unit.NORMAL)
public static T[] joinArrays(@MayContainNull final T[]... arrays) {
int commonLength = 0;
for (final T[] array : arrays) {
if (array != null) {
commonLength += array.length;
}
}
@SuppressWarnings("unchecked") final T[] result = (T[]) Array.newInstance(arrays.getClass().getComponentType().getComponentType(), commonLength);
int position = 0;
for (final T[] array : arrays) {
if (array != null) {
System.arraycopy(array, 0, result, position, array.length);
position += array.length;
}
}
return result;
}
}
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