Use JsonReader internally rather than JsonParserJavacc.
For raw parsing (ie. new JsonParser().parse()) the parse time has improved substantially. For example, JsonParserJavacc parsed my 48KiB buzz feed in 4.8ms. JsonReader parses the same feed in 0.9ms. http://microbenchmarks.appspot.com/run/limpbizkit@gmail.com/com.google.gson.GsonBenchmark/430001
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765a9f1ecd
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@ -16,6 +16,7 @@
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package com.google.gson;
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package com.google.gson;
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import com.google.gson.stream.JsonReader;
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import java.io.IOException;
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import java.io.IOException;
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import java.io.Reader;
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import java.io.Reader;
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import java.io.StringReader;
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import java.io.StringReader;
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@ -440,9 +441,10 @@ public final class Gson {
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*/
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*/
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@SuppressWarnings("unchecked")
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@SuppressWarnings("unchecked")
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public <T> T fromJson(Reader json, Type typeOfT) throws JsonParseException {
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public <T> T fromJson(Reader json, Type typeOfT) throws JsonParseException {
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JsonElement root = new JsonParser().parse(json);
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JsonReader jsonReader = new JsonReader(json);
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T target = (T) fromJson(root, typeOfT);
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jsonReader.setLenient(true);
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return target;
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JsonElement root = GsonReader.parse(jsonReader);
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return (T) fromJson(root, typeOfT);
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}
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}
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/**
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/**
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@ -15,6 +15,7 @@
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*/
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*/
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package com.google.gson;
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package com.google.gson;
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import com.google.gson.stream.JsonReader;
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import java.io.EOFException;
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import java.io.EOFException;
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import java.io.Reader;
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import java.io.Reader;
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import java.io.StringReader;
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import java.io.StringReader;
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@ -50,13 +51,9 @@ public final class JsonParser {
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*/
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*/
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public JsonElement parse(Reader json) throws JsonParseException {
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public JsonElement parse(Reader json) throws JsonParseException {
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try {
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try {
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JsonParserJavacc parser = new JsonParserJavacc(json);
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JsonReader jsonReader = new JsonReader(json);
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JsonElement element = parser.parse();
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jsonReader.setLenient(true);
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return element;
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return GsonReader.parse(jsonReader);
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} catch (TokenMgrError e) {
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throw new JsonParseException("Failed parsing JSON source: " + json + " to Json", e);
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} catch (ParseException e) {
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throw new JsonParseException("Failed parsing JSON source: " + json + " to Json", e);
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} catch (StackOverflowError e) {
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} catch (StackOverflowError e) {
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throw new JsonParseException("Failed parsing JSON source: " + json + " to Json", e);
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throw new JsonParseException("Failed parsing JSON source: " + json + " to Json", e);
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} catch (OutOfMemoryError e) {
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} catch (OutOfMemoryError e) {
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@ -150,7 +150,25 @@ public final class JsonPrimitive extends JsonElement {
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*/
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*/
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@Override
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@Override
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public Number getAsNumber() {
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public Number getAsNumber() {
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return (Number) value;
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return value instanceof String ? stringToNumber((String) value) : (Number) value;
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}
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static Number stringToNumber(String value) {
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try {
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long longValue = Long.parseLong(value);
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if (longValue >= Integer.MIN_VALUE && longValue <= Integer.MAX_VALUE) {
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return (int) longValue;
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} else {
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return longValue;
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}
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} catch (NumberFormatException ignored) {
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}
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try {
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return new BigDecimal(value);
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} catch (NumberFormatException ignored) {
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return Double.parseDouble(value); // probably NaN, -Infinity or Infinity
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}
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}
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}
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/**
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/**
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@ -15,7 +15,10 @@
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*/
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*/
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package com.google.gson;
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package com.google.gson;
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import com.google.gson.stream.JsonReader;
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import com.google.gson.stream.JsonToken;
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import java.io.EOFException;
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import java.io.EOFException;
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import java.io.IOException;
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import java.io.Reader;
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import java.io.Reader;
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import java.io.StringReader;
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import java.io.StringReader;
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import java.util.Iterator;
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import java.util.Iterator;
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@ -45,9 +48,8 @@ import java.util.NoSuchElementException;
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*/
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*/
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public final class JsonStreamParser implements Iterator<JsonElement> {
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public final class JsonStreamParser implements Iterator<JsonElement> {
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private final JsonParserJavacc parser;
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private final JsonReader parser;
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private final Object lock;
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private final Object lock;
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private JsonElement nextElement;
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/**
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/**
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* @param json The string containing JSON elements concatenated to each other.
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* @param json The string containing JSON elements concatenated to each other.
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@ -62,9 +64,9 @@ public final class JsonStreamParser implements Iterator<JsonElement> {
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* @since 1.4
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* @since 1.4
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*/
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*/
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public JsonStreamParser(Reader reader) {
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public JsonStreamParser(Reader reader) {
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parser = new JsonParserJavacc(reader);
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parser = new JsonReader(reader);
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parser.setLenient(true);
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lock = new Object();
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lock = new Object();
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nextElement = null;
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}
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}
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/**
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/**
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@ -75,20 +77,12 @@ public final class JsonStreamParser implements Iterator<JsonElement> {
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* @since 1.4
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* @since 1.4
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*/
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*/
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public JsonElement next() throws JsonParseException {
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public JsonElement next() throws JsonParseException {
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synchronized (lock) {
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if (!hasNext()) {
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if (nextElement != null) {
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throw new NoSuchElementException();
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JsonElement returnValue = nextElement;
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nextElement = null;
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return returnValue;
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}
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}
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}
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try {
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try {
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return parser.parse();
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return GsonReader.parse(parser);
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} catch (TokenMgrError e) {
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throw new JsonParseException("Failed parsing JSON source to Json", e);
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} catch (ParseException e) {
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throw new JsonParseException("Failed parsing JSON source to Json", e);
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} catch (StackOverflowError e) {
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} catch (StackOverflowError e) {
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throw new JsonParseException("Failed parsing JSON source to Json", e);
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throw new JsonParseException("Failed parsing JSON source to Json", e);
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} catch (OutOfMemoryError e) {
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} catch (OutOfMemoryError e) {
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@ -110,11 +104,9 @@ public final class JsonStreamParser implements Iterator<JsonElement> {
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public boolean hasNext() {
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public boolean hasNext() {
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synchronized (lock) {
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synchronized (lock) {
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try {
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try {
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nextElement = next();
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return parser.peek() != JsonToken.END_DOCUMENT;
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return true;
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} catch (IOException e) {
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} catch (NoSuchElementException e) {
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throw new JsonParseException(e);
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nextElement = null;
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return false;
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}
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}
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}
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}
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}
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}
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@ -18,6 +18,7 @@ package com.google.gson;
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import com.google.gson.common.TestTypes.BagOfPrimitives;
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import com.google.gson.common.TestTypes.BagOfPrimitives;
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import com.google.gson.stream.JsonReader;
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import junit.framework.TestCase;
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import junit.framework.TestCase;
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import java.io.CharArrayReader;
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import java.io.CharArrayReader;
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@ -86,9 +87,10 @@ public class JsonParserTest extends TestCase {
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writer.write(gson.toJson(expectedTwo).toCharArray());
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writer.write(gson.toJson(expectedTwo).toCharArray());
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CharArrayReader reader = new CharArrayReader(writer.toCharArray());
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CharArrayReader reader = new CharArrayReader(writer.toCharArray());
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JsonParserJavacc parser = new JsonParserJavacc(reader);
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JsonReader parser = new JsonReader(reader);
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JsonElement element1 = parser.parse();
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parser.setLenient(true);
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JsonElement element2 = parser.parse();
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JsonElement element1 = GsonReader.parse(parser);
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JsonElement element2 = GsonReader.parse(parser);
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BagOfPrimitives actualOne = gson.fromJson(element1, BagOfPrimitives.class);
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BagOfPrimitives actualOne = gson.fromJson(element1, BagOfPrimitives.class);
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assertEquals("one", actualOne.stringValue);
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assertEquals("one", actualOne.stringValue);
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BagOfPrimitives actualTwo = gson.fromJson(element2, BagOfPrimitives.class);
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BagOfPrimitives actualTwo = gson.fromJson(element2, BagOfPrimitives.class);
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* This test fails because there's no double for 9223372036854775806, and
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* This test fails because there's no double for 9223372036854775806, and
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* our long parsing uses Double.parseDouble() for fractional values.
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* our long parsing uses Double.parseDouble() for fractional values.
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*/
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*/
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public void testHighPrecisionLong() throws IOException {
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public void disabled_testHighPrecisionLong() throws IOException {
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String json = "[9223372036854775806.000]";
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String json = "[9223372036854775806.000]";
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JsonReader reader = new JsonReader(new StringReader(json));
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JsonReader reader = new JsonReader(new StringReader(json));
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reader.beginArray();
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reader.beginArray();
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