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h2database
提交 99ed31d7 authored 作者: Evgenij Ryazanov's avatar Evgenij Ryazanov
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Reduce string allocation in EWKT parser

上级 84fd7fe1
显示空白字符变更
内嵌 并排
正在显示 包含 120 行增加 和 90 行删除
h2/src/main/org/h2/util/geometry/EWKTUtils.java
浏览文件 @ 99ed31d7
......@@ -5,6 +5,7 @@
*/
package org.h2.util.geometry;
import static org.h2.util.geometry.GeometryUtils.DIMENSION_SYSTEM_XY;
import static org.h2.util.geometry.GeometryUtils.DIMENSION_SYSTEM_XYM;
import static org.h2.util.geometry.GeometryUtils.DIMENSION_SYSTEM_XYZ;
import static org.h2.util.geometry.GeometryUtils.DIMENSION_SYSTEM_XYZM;
......@@ -24,7 +25,6 @@ import java.io.ByteArrayOutputStream;
import java.util.ArrayList;
import org.h2.engine.SysProperties;
import org.h2.util.StringUtils;
import org.h2.util.geometry.EWKBUtils.EWKBTarget;
import org.h2.util.geometry.GeometryUtils.DimensionSystemTarget;
import org.h2.util.geometry.GeometryUtils.Target;
......@@ -272,65 +272,120 @@ public final class EWKTUtils {
offset++;
}
boolean readEmpty(boolean empty) {
if (empty) {
return true;
}
int readType() {
skipWS();
int len = ewkt.length();
if (offset >= len) {
throw new IllegalArgumentException();
}
if (ewkt.charAt(offset) == '(') {
offset++;
return false;
int result = 0;
char ch = ewkt.charAt(offset);
switch (ch) {
case 'P':
case 'p':
result = match("POINT", POINT);
if (result == 0) {
result = match("POLYGON", POLYGON);
}
break;
case 'L':
case 'l':
result = match("LINESTRING", LINE_STRING);
break;
case 'M':
case 'm':
if (match("MULTI", 1) != 0) {
result = match("POINT", MULTI_POINT);
if (result == 0) {
result = match("POLYGON", MULTI_POLYGON);
if (result == 0) {
result = match("LINESTRING", MULTI_LINE_STRING);
}
}
if (!readWord().equals("EMPTY")) {
}
break;
case 'G':
case 'g':
result = match("GEOMETRYCOLLECTION", GEOMETRY_COLLECTION);
break;
}
if (result == 0) {
throw new IllegalArgumentException();
}
return true;
return result;
}
String readWord() {
return readWordImpl(true);
int readDimensionSystem() {
int o = offset;
skipWS();
int len = ewkt.length();
if (offset > len - 2) {
throw new IllegalArgumentException();
}
String tryReadWord() {
return readWordImpl(false);
int result;
char ch = ewkt.charAt(offset);
switch (ch) {
case 'M':
case 'm':
result = DIMENSION_SYSTEM_XYM;
offset++;
break;
case 'Z':
case 'z':
offset++;
ch = ewkt.charAt(offset);
if (ch == 'M' || ch == 'm') {
offset++;
result = DIMENSION_SYSTEM_XYZM;
} else {
result = DIMENSION_SYSTEM_XYZ;
}
break;
default:
result = DIMENSION_SYSTEM_XY;
if (o != offset) {
// Token is already terminated by a whitespace
return result;
}
}
checkStringEnd(len);
return result;
}
private String readWordImpl(boolean required) {
boolean readEmpty() {
skipWS();
int len = ewkt.length();
if (offset >= len) {
if (required) {
throw new IllegalArgumentException();
} else {
return null;
}
if (ewkt.charAt(offset) == '(') {
offset++;
return false;
}
if (match("EMPTY", 1) != 0) {
checkStringEnd(len);
return true;
}
char ch = ewkt.charAt(offset);
if (!isLatinLetter(ch)) {
if (required) {
throw new IllegalArgumentException();
} else {
return null;
}
private int match(String token, int code) {
int l = token.length();
if (offset <= ewkt.length() - l && ewkt.regionMatches(true, offset, token, 0, l)) {
offset += l;
} else {
code = 0;
}
int start = offset++;
while (offset < len && isLatinLetter(ch = ewkt.charAt(offset))) {
offset++;
return code;
}
private void checkStringEnd(int len) {
if (offset < len) {
char ch = ewkt.charAt(offset);
if (ch > ' ' && ch != '(' && ch != ')' && ch != ',') {
throw new IllegalArgumentException();
}
}
return StringUtils.toUpperEnglish(ewkt.substring(start, offset));
}
private static boolean isLatinLetter(char ch) {
return ch >= 'A' && ch <= 'Z' || ch >= 'a' && ch <= 'z';
}
public boolean hasCoordinate() {
......@@ -543,61 +598,35 @@ public final class EWKTUtils {
if (parentType == 0) {
target.init(source.readSRID());
}
String type;
boolean empty = false;
int type;
switch (parentType) {
default: {
type = source.readWord();
if (type.endsWith("M")) {
useM = true;
if (type.endsWith("ZM")) {
type = source.readType();
int ds = source.readDimensionSystem();
if ((ds & DIMENSION_SYSTEM_XYZ) != 0) {
useZ = true;
type = type.substring(0, type.length() - 2);
} else {
type = type.substring(0, type.length() - 1);
}
} else if (type.endsWith("Z")) {
useZ = true;
type = type.substring(0, type.length() - 1);
} else {
String s = source.tryReadWord();
if (s != null) {
switch (s) {
case "Z":
useZ = true;
break;
case "M":
if ((ds & DIMENSION_SYSTEM_XYM) != 0) {
useM = true;
break;
case "ZM":
useZ = useM = true;
break;
case "EMPTY":
empty = true;
break;
default:
throw new IllegalArgumentException();
}
}
}
break;
}
case MULTI_POINT:
type = "POINT";
type = POINT;
break;
case MULTI_LINE_STRING:
type = "LINESTRING";
type = LINE_STRING;
break;
case MULTI_POLYGON:
type = "POLYGON";
type = POLYGON;
break;
}
switch (type) {
case "POINT":
case POINT: {
if (parentType != 0 && parentType != MULTI_POINT && parentType != GEOMETRY_COLLECTION) {
throw new IllegalArgumentException();
}
empty = source.readEmpty(empty);
boolean empty = source.readEmpty();
target.startPoint();
if (empty) {
target.addCoordinate(Double.NaN, Double.NaN, Double.NaN, Double.NaN, 0, 1);
......@@ -606,11 +635,12 @@ public final class EWKTUtils {
source.read(')');
}
break;
case "LINESTRING": {
}
case LINE_STRING: {
if (parentType != 0 && parentType != MULTI_LINE_STRING && parentType != GEOMETRY_COLLECTION) {
throw new IllegalArgumentException();
}
empty = source.readEmpty(empty);
boolean empty = source.readEmpty();
if (empty) {
target.startLineString(0);
} else {
......@@ -630,11 +660,11 @@ public final class EWKTUtils {
}
break;
}
case "POLYGON": {
case POLYGON: {
if (parentType != 0 && parentType != MULTI_POLYGON && parentType != GEOMETRY_COLLECTION) {
throw new IllegalArgumentException();
}
empty = source.readEmpty(empty);
boolean empty = source.readEmpty();
if (empty) {
target.startPolygon(0, 0);
} else {
......@@ -670,17 +700,17 @@ public final class EWKTUtils {
}
break;
}
case "MULTIPOINT":
parseCollection(source, target, MULTI_POINT, parentType, empty, useZ, useM);
case MULTI_POINT:
parseCollection(source, target, MULTI_POINT, parentType, useZ, useM);
break;
case "MULTILINESTRING":
parseCollection(source, target, MULTI_LINE_STRING, parentType, empty, useZ, useM);
case MULTI_LINE_STRING:
parseCollection(source, target, MULTI_LINE_STRING, parentType, useZ, useM);
break;
case "MULTIPOLYGON":
parseCollection(source, target, MULTI_POLYGON, parentType, empty, useZ, useM);
case MULTI_POLYGON:
parseCollection(source, target, MULTI_POLYGON, parentType, useZ, useM);
break;
case "GEOMETRYCOLLECTION":
parseCollection(source, target, GEOMETRY_COLLECTION, parentType, empty, useZ, useM);
case GEOMETRY_COLLECTION:
parseCollection(source, target, GEOMETRY_COLLECTION, parentType, useZ, useM);
break;
default:
throw new IllegalArgumentException();
......@@ -690,12 +720,12 @@ public final class EWKTUtils {
}
}
private static void parseCollection(EWKTSource source, Target target, int type, int parentType, boolean empty,
boolean useZ, boolean useM) {
private static void parseCollection(EWKTSource source, Target target, int type, int parentType, boolean useZ,
boolean useM) {
if (parentType != 0 && parentType != GEOMETRY_COLLECTION) {
throw new IllegalArgumentException();
}
if (source.readEmpty(empty)) {
if (source.readEmpty()) {
target.startCollection(type, 0);
} else {
if (type == MULTI_POINT && source.hasCoordinate()) {
......@@ -735,7 +765,7 @@ public final class EWKTUtils {
}
private static ArrayList<double[]> readRing(EWKTSource source, boolean useZ, boolean useM) {
if (source.readEmpty(false)) {
if (source.readEmpty()) {
return new ArrayList<>(0);
}
ArrayList<double[]> result = new ArrayList<>();
......
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