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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.text.internal;
/**
* Truncate text to a snippet suitable for logging.
*
* @author hakon
*/
public class SnippetGenerator {
private static final String OMIT_PREFIX = "[...";
private static final String OMIT_SUFFIX = " chars omitted]";
private static final int ASSUMED_OMIT_TEXT_LENGTH = OMIT_PREFIX.length() + 4 + OMIT_SUFFIX.length();
/** Returns a snippet of approximate size. */
public String makeSnippet(String text, int sizeHint) {
if (text.length() <= Math.max(sizeHint, ASSUMED_OMIT_TEXT_LENGTH)) return text;
int maxSuffixLength = Math.max(0, (sizeHint - ASSUMED_OMIT_TEXT_LENGTH) / 2);
int maxPrefixLength = Math.max(0, sizeHint - ASSUMED_OMIT_TEXT_LENGTH - maxSuffixLength);
String sizeString = Integer.toString(text.length() - maxPrefixLength - maxSuffixLength);
// It would be silly to return a snippet when the full text is barely longer.
// Note: Say ASSUMED_OMIT_TEXT_LENGTH=23: text will be returned whenever sizeHint<23 and text.length()<28.
int snippetLength = maxPrefixLength + OMIT_PREFIX.length() + sizeString.length() + OMIT_SUFFIX.length() + maxSuffixLength;
if (text.length() <= 1.05 * snippetLength + 5) return text;
return text.substring(0, maxPrefixLength) +
OMIT_PREFIX +
sizeString +
OMIT_SUFFIX +
text.substring(text.length() - maxSuffixLength);
}
}
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