StringLiteral.java

// 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.
// This file is copied from
// https://github.com/apache/impala/blob/branch-2.9.0/fe/src/main/java/org/apache/impala/StringLiteral.java
// and modified by Doris

package org.apache.doris.analysis;

import org.apache.doris.catalog.TableIf;
import org.apache.doris.catalog.TableIf.TableType;
import org.apache.doris.catalog.Type;
import org.apache.doris.common.FormatOptions;
import org.apache.doris.thrift.TExprNode;
import org.apache.doris.thrift.TExprNodeType;
import org.apache.doris.thrift.TStringLiteral;

import com.google.common.base.Preconditions;
import com.google.gson.annotations.SerializedName;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

import java.io.UnsupportedEncodingException;
import java.util.Objects;

public class StringLiteral extends LiteralExpr {
    private static final Logger LOG = LogManager.getLogger(StringLiteral.class);
    @SerializedName("v")
    private String value;
    // Means the converted session variable need to be cast to int, such as "cast 'STRICT_TRANS_TABLES' to Integer".
    private String beConverted = "";

    private StringLiteral() {
        super();
        type = Type.VARCHAR;
    }

    public StringLiteral(String value) {
        super();
        this.value = value;
        type = Type.VARCHAR;
        analysisDone();
    }

    protected StringLiteral(StringLiteral other) {
        super(other);
        value = other.value;
    }

    public void setBeConverted(String val) {
        this.beConverted = val;
    }

    @Override
    public Expr clone() {
        return new StringLiteral(this);
    }

    @Override
    public int compareLiteral(LiteralExpr expr) {
        if (expr instanceof PlaceHolderExpr) {
            return this.compareLiteral(((PlaceHolderExpr) expr).getLiteral());
        }
        if (expr instanceof NullLiteral) {
            return 1;
        }
        if (expr == MaxLiteral.MAX_VALUE) {
            return -1;
        }
        // compare string with utf-8 byte array, same with DM,BE,StorageEngine
        byte[] thisBytes = null;
        byte[] otherBytes = null;
        try {
            thisBytes = value.getBytes("UTF-8");
            otherBytes = expr.getStringValue().getBytes("UTF-8");
        } catch (UnsupportedEncodingException e) {
            Preconditions.checkState(false);
        }

        int minLength = Math.min(thisBytes.length, otherBytes.length);
        int i = 0;
        for (i = 0; i < minLength; i++) {
            if (Byte.toUnsignedInt(thisBytes[i]) < Byte.toUnsignedInt(otherBytes[i])) {
                return -1;
            } else if (Byte.toUnsignedInt(thisBytes[i]) > Byte.toUnsignedInt(otherBytes[i])) {
                return 1;
            }
        }
        if (thisBytes.length > otherBytes.length) {
            if (thisBytes[i] == 0x00) {
                return 0;
            } else {
                return 1;
            }
        } else if (thisBytes.length < otherBytes.length) {
            if (otherBytes[i] == 0x00) {
                return 0;
            } else {
                return -1;
            }
        } else {
            return 0;
        }
    }

    public String getValue() {
        return value;
    }

    @Override
    public boolean isMinValue() {
        return false;
    }

    @Override
    public String toSqlImpl() {
        return "'" + value.replaceAll("'", "''") + "'";
    }

    @Override
    public String toSqlImpl(boolean disableTableName, boolean needExternalSql, TableType tableType,
            TableIf table) {
        return "'" + value.replaceAll("'", "''") + "'";
    }

    @Override
    protected void toThrift(TExprNode msg) {
        if (value == null) {
            msg.node_type = TExprNodeType.NULL_LITERAL;
        } else {
            msg.string_literal = new TStringLiteral(value);
            msg.node_type = TExprNodeType.STRING_LITERAL;
        }
    }

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

    @Override
    protected String getStringValueInComplexTypeForQuery(FormatOptions options) {
        return options.getNestedStringWrapper() + getStringValueForQuery(options) + options.getNestedStringWrapper();
    }

    @Override
    public long getLongValue() {
        return Long.valueOf(value);
    }

    @Override
    public double getDoubleValue() {
        return Double.parseDouble(value);
    }

    @Override
    public String getRealValue() {
        return getStringValue();
    }

    @Override
    public int hashCode() {
        return 31 * super.hashCode() + Objects.hashCode(value);
    }

}