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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed 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.android.loganalysis.util;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
/**
* Utility methods for arrays
*/
// TODO: Use libTF once this is copied over.
public class ArrayUtil {
private ArrayUtil() {
}
/**
* Build an array from the provided contents.
*
* <p>
* The resulting array will be the concatenation of <var>arrays</var> input arrays, in their
* original order.
* </p>
*
* @param arrays the arrays to concatenate
* @return the newly constructed array
*/
public static String[] buildArray(String[]... arrays) {
int length = 0;
for (String[] array : arrays) {
length += array.length;
}
String[] newArray = new String[length];
int offset = 0;
for (String[] array : arrays) {
System.arraycopy(array, 0, newArray, offset, array.length);
offset += array.length;
}
return newArray;
}
/**
* Convert a varargs list/array to an {@link List}. This is useful for building instances of
* {@link List} by hand. Note that this differs from {@link java.util.Arrays#asList} in that
* the returned array is mutable.
*
* @param inputAry an array, or a varargs list
* @return a {@link List} instance with the identical contents
*/
@SafeVarargs
public static <T> List<T> list(T... inputAry) {
List<T> retList = new ArrayList<T>(inputAry.length);
for (T item : inputAry) {
retList.add(item);
}
return retList;
}
private static String internalJoin(String sep, Collection<Object> pieces) {
StringBuilder sb = new StringBuilder();
boolean skipSep = true;
Iterator<Object> iter = pieces.iterator();
while (iter.hasNext()) {
if (skipSep) {
skipSep = false;
} else {
sb.append(sep);
}
Object obj = iter.next();
if (obj == null) {
sb.append("null");
} else {
sb.append(obj.toString());
}
}
return sb.toString();
}
/**
* Turns a sequence of objects into a string, delimited by {@code sep}. If a single
* {@code Collection} is passed, it is assumed that the elements of that Collection are to be
* joined. Otherwise, wraps the passed {@link Object}(s) in a {@link List} and joins the
* generated list.
*
* @param sep the string separator to delimit the different output segments.
* @param pieces A {@link Collection} or a varargs {@code Array} of objects.
*/
@SuppressWarnings("unchecked")
public static String join(String sep, Object... pieces) {
if ((pieces.length == 1) && (pieces[0] instanceof Collection)) {
// Don't re-wrap the Collection
return internalJoin(sep, (Collection<Object>) pieces[0]);
} else {
return internalJoin(sep, Arrays.asList(pieces));
}
}
}
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