StringLikeLiteral.java

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// 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
//
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package org.apache.doris.nereids.trees.expressions.literal;

import org.apache.doris.nereids.types.DataType;

import java.nio.charset.StandardCharsets;
import java.util.Objects;

/**
 * StringLikeLiteral.
 */
public abstract class StringLikeLiteral extends Literal {
    public static final int CHINESE_CHAR_BYTE_LENGTH = 4;
    public final String value;

    public StringLikeLiteral(String value, DataType dataType) {
        super(dataType);
        this.value = value;
    }

    public String getStringValue() {
        return value;
    }

    @Override
    public double getDouble() {
        return getDouble(value);
    }

    /**
     * get double value
     */
    public static double getDouble(String str) {
        byte[] bytes = str.getBytes(StandardCharsets.UTF_8);
        long v = 0;
        int pos = 0;
        int len = Math.min(bytes.length, 7);
        while (pos < len) {
            v += Byte.toUnsignedLong(bytes[pos]) << ((6 - pos) * 8);
            pos++;
        }
        return (double) v;
    }

    @Override
    public String getValue() {
        return value;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (!(o instanceof StringLikeLiteral)) {
            return false;
        }
        StringLikeLiteral that = (StringLikeLiteral) o;
        return Objects.equals(value, that.value);
    }

    @Override
    public String toString() {
        return "'" + value + "'";
    }
}