43 lines
1.1 KiB
Java
43 lines
1.1 KiB
Java
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package it.cavallium.dbengine.utils;
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import java.io.DataInput;
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import java.io.DataOutput;
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import java.io.IOException;
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import java.nio.charset.StandardCharsets;
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public class UTFUtils {
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public static void writeUTF(DataOutput out, String utf) throws IOException {
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byte[] bytes = utf.getBytes(StandardCharsets.UTF_8);
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out.writeInt(bytes.length);
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out.write(bytes);
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}
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public static String readUTF(DataInput in) throws IOException {
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int len = in.readInt();
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byte[] data = new byte[len];
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in.readFully(data, 0, len);
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return new String(data, StandardCharsets.UTF_8);
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}
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/**
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* Keep only ascii alphanumeric letters
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*/
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public static String keepOnlyASCII(String nextString) {
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char[] chars = nextString.toCharArray();
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//noinspection UnusedAssignment
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nextString = null;
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int writeIndex = 0;
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char c;
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for (int checkIndex = 0; checkIndex < chars.length; checkIndex++) {
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c = chars[checkIndex];
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if ((c >= '0' && c <= '9') || (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z')) {
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if (writeIndex != checkIndex) {
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chars[writeIndex] = c;
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}
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writeIndex++;
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}
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}
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return new String(chars, 0, writeIndex);
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}
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}
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