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com.blazebit.persistence.impl.function.tostringjson.GroupConcatBasedToStringJsonFunction Maven / Gradle / Ivy
/*
* Copyright 2014 - 2020 Blazebit.
*
* Licensed 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 com.blazebit.persistence.impl.function.tostringjson;
import com.blazebit.persistence.impl.function.Order;
import com.blazebit.persistence.impl.function.chr.ChrFunction;
import com.blazebit.persistence.impl.function.concat.ConcatFunction;
import com.blazebit.persistence.impl.function.groupconcat.AbstractGroupConcatFunction;
import com.blazebit.persistence.impl.function.replace.ReplaceFunction;
import com.blazebit.persistence.impl.util.SqlUtils;
import com.blazebit.persistence.spi.FunctionRenderContext;
import com.blazebit.persistence.spi.LateralStyle;
import java.util.Collections;
/**
* @author Christian Beikov
* @since 1.5.0
*/
public class GroupConcatBasedToStringJsonFunction extends AbstractToStringJsonFunction {
protected final ConcatFunction concatFunction;
protected final String preChunk;
protected final String postChunk;
protected final String start;
protected final String end;
private final boolean coalesceNestedMultiset;
private final AbstractGroupConcatFunction groupConcatFunction;
private final LateralStyle lateralStyle;
public GroupConcatBasedToStringJsonFunction(AbstractGroupConcatFunction groupConcatFunction, ChrFunction chrFunction, ReplaceFunction replaceFunction, ConcatFunction concatFunction, LateralStyle lateralStyle) {
this(getPreChunk(concatFunction), getPostChunk(concatFunction), true, groupConcatFunction, chrFunction, replaceFunction, concatFunction, lateralStyle);
}
protected GroupConcatBasedToStringJsonFunction(String preChunk, String postChunk, boolean coalesceNestedMultiset, AbstractGroupConcatFunction groupConcatFunction, ChrFunction chrFunction, ReplaceFunction replaceFunction, ConcatFunction concatFunction, LateralStyle lateralStyle) {
this.preChunk = preChunk;
this.postChunk = postChunk;
this.coalesceNestedMultiset = coalesceNestedMultiset;
this.groupConcatFunction = groupConcatFunction;
this.concatFunction = concatFunction;
this.lateralStyle = lateralStyle;
String backslash = chrFunction.getEncodedString(Integer.toString('\\'));
String backslashB = chrFunction.getEncodedString(Integer.toString('\b'));
String backslashF = chrFunction.getEncodedString(Integer.toString('\f'));
String backslashN = chrFunction.getEncodedString(Integer.toString('\n'));
String backslashR = chrFunction.getEncodedString(Integer.toString('\r'));
String backslashT = chrFunction.getEncodedString(Integer.toString('\t'));
String backslashBackslash = concatFunction.startConcat() + backslash + concatFunction.concatSeparator() + backslash + concatFunction.endConcat();
String backslashBackslashB = concatFunction.startConcat() + backslash + concatFunction.concatSeparator() + chrFunction.getEncodedString(Integer.toString('\b')) + concatFunction.endConcat();
String backslashBackslashF = concatFunction.startConcat() + backslash + concatFunction.concatSeparator() + chrFunction.getEncodedString(Integer.toString('\f')) + concatFunction.endConcat();
String backslashBackslashN = concatFunction.startConcat() + backslash + concatFunction.concatSeparator() + chrFunction.getEncodedString(Integer.toString('\n')) + concatFunction.endConcat();
String backslashBackslashR = concatFunction.startConcat() + backslash + concatFunction.concatSeparator() + chrFunction.getEncodedString(Integer.toString('\r')) + concatFunction.endConcat();
String backslashBackslashT = concatFunction.startConcat() + backslash + concatFunction.concatSeparator() + chrFunction.getEncodedString(Integer.toString('\t')) + concatFunction.endConcat();
String backslashSlash = concatFunction.startConcat() + backslash + concatFunction.concatSeparator() + chrFunction.getEncodedString(Integer.toString('/')) + concatFunction.endConcat();
String backslashQuote = concatFunction.startConcat() + backslash + concatFunction.concatSeparator() + "'\"'" + concatFunction.endConcat();
String argument = "\0";
argument = replaceFunction.getReplaceString(argument, backslash, backslashBackslash);
argument = replaceFunction.getReplaceString(argument, "'/'", backslashSlash);
argument = replaceFunction.getReplaceString(argument, backslashB, backslashBackslashB);
argument = replaceFunction.getReplaceString(argument, backslashF, backslashBackslashF);
argument = replaceFunction.getReplaceString(argument, backslashN, backslashBackslashN);
argument = replaceFunction.getReplaceString(argument, backslashR, backslashBackslashR);
argument = replaceFunction.getReplaceString(argument, backslashT, backslashBackslashT);
argument = replaceFunction.getReplaceString(argument, "'\"'", backslashQuote);
String[] split = argument.split("\0");
this.start = split[0];
this.end = split[1];
}
private static String getPreChunk(ConcatFunction concatFunction) {
return "(select " + concatFunction.startConcat() + "'['" + concatFunction.concatSeparator();
}
private static String getPostChunk(ConcatFunction concatFunction) {
return concatFunction.concatSeparator() + "']'" + concatFunction.endConcat();
}
@Override
public void render(FunctionRenderContext context, String[] fields, String[] selectItemExpressions, String subquery, int fromIndex) {
int orderByIndex = SqlUtils.indexOfOrderBy(subquery, fromIndex);
if (orderByIndex == -1) {
context.addChunk(preChunk);
groupConcatFunction.render(context, new AbstractGroupConcatFunction.GroupConcat(false, createGroupConcatArgument(fields, selectItemExpressions, fromIndex), Collections.emptyList(), ","));
context.addChunk(postChunk);
context.addChunk(subquery.substring(fromIndex));
} else {
String limitText = SqlUtils.LIMIT;
int limitIndex = SqlUtils.indexOfLimit(subquery, orderByIndex);
if (limitIndex == -1) {
limitText = SqlUtils.FETCH_FIRST;
limitIndex = SqlUtils.indexOfFetchFirst(subquery, orderByIndex);
}
if (limitIndex == -1) {
context.addChunk(preChunk);
groupConcatFunction.render(context, new AbstractGroupConcatFunction.GroupConcat(false, createGroupConcatArgument(fields, selectItemExpressions, fromIndex), Collections.emptyList(), ","));
context.addChunk(" OVER (");
context.addChunk(subquery.substring(orderByIndex));
context.addChunk(postChunk);
context.addChunk(subquery.substring(fromIndex, orderByIndex));
context.addChunk(")");
} else {
if (lateralStyle == LateralStyle.NONE) {
context.addChunk(preChunk);
groupConcatFunction.render(context, new AbstractGroupConcatFunction.GroupConcat(false, createGroupConcatArgument(fields, selectItemExpressions, fromIndex), Collections.emptyList(), ","));
context.addChunk(" OVER (");
context.addChunk(subquery.substring(orderByIndex, limitIndex));
String limitClause = subquery.substring(limitIndex + limitText.length(), subquery.length() - 1);
String offsetText = " offset ";
int offsetIndex = limitClause.indexOf(offsetText);
if (offsetIndex == -1) {
context.addChunk(" ROWS BETWEEN CURRENT ROW AND (");
context.addChunk(limitClause);
context.addChunk(" - 1) FOLLOWING");
} else {
context.addChunk(" ROWS BETWEEN ");
context.addChunk(limitClause.substring(offsetIndex + offsetText.length()));
context.addChunk(" FOLLOWING AND ");
context.addChunk(limitClause.substring(0, offsetIndex));
context.addChunk(" FOLLOWING");
}
context.addChunk(")");
context.addChunk(postChunk);
context.addChunk(subquery.substring(fromIndex, limitIndex));
context.addChunk(" limit 1)");
} else {
context.addChunk(preChunk);
groupConcatFunction.render(context, new AbstractGroupConcatFunction.GroupConcat(false, createGroupConcatArgument(fields, fields, fromIndex), Collections.emptyList(), ","));
context.addChunk(postChunk);
context.addChunk(" from lateral(select ");
for (int i = 0; i < fields.length; i++) {
if (i != 0) {
context.addChunk(",");
}
context.addChunk(selectItemExpressions[i]);
context.addChunk(" ");
context.addChunk(fields[i]);
}
context.addChunk(subquery.substring(fromIndex));
context.addChunk(" tmp)");
}
}
}
}
private String createGroupConcatArgument(String[] fields, String[] selectItemExpressions, int fromIndex) {
StringBuilder sb = new StringBuilder(fromIndex);
render(sb, fields, selectItemExpressions);
return sb.toString();
}
protected void render(StringBuilder sb, String[] fields, String[] selectItemExpressions) {
sb.append(concatFunction.startConcat());
sb.append("'{\"");
for (int i = 0; i < fields.length; i++) {
if (i != 0) {
sb.append(concatFunction.concatSeparator());
sb.append("',\"");
}
sb.append(fields[i]);
sb.append("\":'");
sb.append(concatFunction.concatSeparator());
// Don't escape nested multiset invocations
if (selectItemExpressions[i].startsWith(preChunk)) {
if (coalesceNestedMultiset) {
sb.append(coalesceStart());
sb.append(selectItemExpressions[i]);
sb.append(coalesceEnd(fields[i]));
} else {
sb.append(selectItemExpressions[i]);
}
} else {
sb.append(coalesceStart());
sb.append(concatFunction.startConcat());
sb.append("'\"'");
sb.append(concatFunction.concatSeparator());
sb.append(start);
sb.append(selectItemExpressions[i]);
sb.append(end);
sb.append(concatFunction.concatSeparator());
sb.append("'\"'");
sb.append(concatFunction.endConcat());
sb.append(coalesceEnd(fields[i]));
}
}
sb.append(concatFunction.concatSeparator());
sb.append("'}'");
sb.append(concatFunction.endConcat());
}
protected String coalesceStart() {
return "coalesce(";
}
protected String coalesceEnd(String field) {
return ",'null')";
}
}
