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/*
*
* 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 flash.util;
/**
* Format a sequence of characters into a fixed length field
* justifying if applied.
*/
public class FieldFormat
{
public static final int ALIGN_UNKNOWN = 0;
public static final int ALIGN_LEFT = 1;
public static final int ALIGN_RIGHT = 2;
public static final int ALIGN_CENTER = 3;
// Right justifies a long value into a hex field with leading zeros
public static StringBuilder formatLongToHex(StringBuilder sb, long v, int length) { return formatLongToHex(sb,v,length,true); }
// Right justifies a long value into a field optionally zero filling the opening.
public static StringBuilder formatLongToHex(StringBuilder sb, long v, int length, boolean leadingZeros)
{
return format(sb, Long.toHexString(v), length, ALIGN_RIGHT, ((leadingZeros) ? '0' : ' '), ' ');
}
// Right justifies a long value into a fixed length field
public static StringBuilder formatLong(StringBuilder sb, long v, int length) { return formatLong(sb,v,length,false); }
public static StringBuilder formatLong(StringBuilder sb, long v, int length, boolean leadingZeros)
{
return format(sb, Long.toString(v), length, ((leadingZeros) ? ALIGN_RIGHT : ALIGN_LEFT), ((leadingZeros) ? '0' : ' '), ' ');
}
// basis for all formats
public static StringBuilder format(StringBuilder sb, String chars, int length, int alignment, char preFieldCharacter, char postFieldCharacter)
{
// find the length of our string
int charsCount = chars.length();
// position within the field
int startAt = 0;
if (alignment == ALIGN_RIGHT)
startAt = length - charsCount;
else if (alignment == ALIGN_CENTER)
startAt = (length - charsCount)/2;
// force to right it off edge
if (startAt < 0)
startAt = 0;
// truncate it
if ((startAt + charsCount) > length)
charsCount = length-startAt;
// now add the pre-field if any
for(int i=0; i
