java/src/main/java/com/jsoniter/CodegenImplObject.java at master · akan/java · GitHub

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package com.jsoniter;

import java.lang.reflect.Type;

import java.util.*;

class CodegenImplObject {

final static Map<String, String> DEFAULT_VALUES = new HashMap<String, String>() {{

put("float", "0.0f");

put("double", "0.0d");

put("boolean", "false");

put("byte", "0");

put("short", "0");

put("int", "0");

put("char", "0");

put("long", "0");

}};

public static String genObjectUsingSlice(Class clazz, String cacheKey, CustomizedConstructor ctor,

List<CustomizedSetter> setters, List<Binding> fields) {

ArrayList<Binding> allBindings = new ArrayList<Binding>(fields);

allBindings.addAll(ctor.parameters);

for (CustomizedSetter setter : setters) {

allBindings.addAll(setter.parameters);

}

if (allBindings.isEmpty()) {

return genObjectUsingSkip(clazz, ctor);

}

Map<Integer, Object> trieTree = buildTriTree(allBindings);

StringBuilder lines = new StringBuilder();

append(lines, "public static Object decode_(com.jsoniter.JsonIterator iter) {");

append(lines, "if (iter.readNull()) { return null; }");

if (ctor.parameters.isEmpty()) {

append(lines, "{{clazz}} obj = {{newInst}};");

append(lines, "if (!com.jsoniter.CodegenAccess.readObjectStart(iter)) { return obj; }");

} else {

for (Binding parameter : ctor.parameters) {

appendVarDef(lines, parameter);

}

append(lines, "if (!com.jsoniter.CodegenAccess.readObjectStart(iter)) { return {{newInst}}; }");

for (Binding field : fields) {

appendVarDef(lines, field);

}

for (CustomizedSetter setter : setters) {

for (Binding param : setter.parameters) {

appendVarDef(lines, param);

}

append(lines, "com.jsoniter.CodegenAccess.resetExistingObject(iter);");

append(lines, "com.jsoniter.Slice field = com.jsoniter.CodegenAccess.readObjectFieldAsSlice(iter);");

append(lines, "boolean once = true;");

append(lines, "while (once) {");

append(lines, "once = false;");

append(lines, "switch (field.len) {");

String rendered = renderTriTree(cacheKey, trieTree);

for (Binding field : fields) {

if (ctor.parameters.isEmpty() && fields.contains(field)) {

if (shouldReuseObject(field.valueType)) {

rendered = rendered.replace("_" + field.name + "_", String.format("obj.%s", field.name));

} else {

rendered = rendered.replace("_" + field.name + "_", String.format(

"com.jsoniter.CodegenAccess.setExistingObject(iter, obj.%s);\nobj.%s", field.name, field.name));

}

append(lines, rendered);

append(lines, "}"); // end of switch

append(lines, "iter.skip();");

append(lines, "}"); // end of while

append(lines, "while (com.jsoniter.CodegenAccess.nextToken(iter) == ',') {");

append(lines, "field = com.jsoniter.CodegenAccess.readObjectFieldAsSlice(iter);");

append(lines, "switch (field.len) {");

append(lines, rendered);

append(lines, "}"); // end of switch

append(lines, "iter.skip();");

append(lines, "}"); // end of while

if (!ctor.parameters.isEmpty()) {

append(lines, String.format("%s obj = {{newInst}};", CodegenImplNative.getTypeName(clazz)));

for (Binding field : fields) {

append(lines, String.format("obj.%s = _%s_;", field.name, field.name));

}

appendSetter(setters, lines);

append(lines, "return obj;");

append(lines, "}");

return lines.toString()

.replace("{{clazz}}", clazz.getCanonicalName())

.replace("{{newInst}}", genNewInstCode(clazz, ExtensionManager.getCtor(clazz)));

}

private static String renderTriTree(String cacheKey, Map<Integer, Object> trieTree) {

StringBuilder switchBody = new StringBuilder();

for (Map.Entry<Integer, Object> entry : trieTree.entrySet()) {

Integer len = entry.getKey();

append(switchBody, "case " + len + ": ");

Map<Byte, Object> current = (Map<Byte, Object>) entry.getValue();

addFieldDispatch(switchBody, len, 0, current, cacheKey, new ArrayList<Byte>());

append(switchBody, "break;");

}

return switchBody.toString();

}

private static Map<Integer, Object> buildTriTree(ArrayList<Binding> allBindings) {

Map<Integer, Object> trieTree = new HashMap<Integer, Object>();

for (Binding field : allBindings) {

for (String fromName : field.fromNames) {

byte[] fromNameBytes = fromName.getBytes();

Map<Byte, Object> current = (Map<Byte, Object>) trieTree.get(fromNameBytes.length);

if (current == null) {

current = new HashMap<Byte, Object>();

trieTree.put(fromNameBytes.length, current);

}

for (int i = 0; i < fromNameBytes.length - 1; i++) {

byte b = fromNameBytes[i];

Map<Byte, Object> next = (Map<Byte, Object>) current.get(b);

if (next == null) {

next = new HashMap<Byte, Object>();

current.put(b, next);

}

current = next;

}

current.put(fromNameBytes[fromNameBytes.length - 1], field);

}

return trieTree;

}

private static void addFieldDispatch(

StringBuilder lines, int len, int i, Map<Byte, Object> current, String cacheKey, List<Byte> bytesToCompare) {

for (Map.Entry<Byte, Object> entry : current.entrySet()) {

Byte b = entry.getKey();

if (i == len - 1) {

append(lines, "if (");

for (int j = 0; j < bytesToCompare.size(); j++) {

Byte a = bytesToCompare.get(j);

append(lines, String.format("field.at(%d)==%s && ", i - bytesToCompare.size() + j, a));

}

append(lines, String.format("field.at(%d)==%s", i, b));

append(lines, ") {");

Binding field = (Binding) entry.getValue();

append(lines, String.format("_%s_ = %s;", field.name, CodegenImplNative.genField(field, cacheKey)));

append(lines, "continue;");

append(lines, "}");

continue;

}

Map<Byte, Object> next = (Map<Byte, Object>) entry.getValue();

if (next.size() == 1) {

ArrayList<Byte> nextBytesToCompare = new ArrayList<Byte>(bytesToCompare);

nextBytesToCompare.add(b);

addFieldDispatch(lines, len, i + 1, next, cacheKey, nextBytesToCompare);

continue;

}

append(lines, "if (");

for (int j = 0; j < bytesToCompare.size(); j++) {

Byte a = bytesToCompare.get(j);

append(lines, String.format("field.at(%d)==%s && ", i - bytesToCompare.size() + j, a));

}

append(lines, String.format("field.at(%d)==%s", i, b));

append(lines, ") {");

addFieldDispatch(lines, len, i + 1, next, cacheKey, new ArrayList<Byte>());

append(lines, "continue;");

append(lines, "}");

}

public static String genObjectUsingHash(Class clazz, String cacheKey, CustomizedConstructor ctor,

List<CustomizedSetter> setters, List<Binding> fields) {

ArrayList<Binding> allBindings = new ArrayList<Binding>(fields);

allBindings.addAll(ctor.parameters);

for (CustomizedSetter setter : setters) {

allBindings.addAll(setter.parameters);

}

if (allBindings.isEmpty()) {

return genObjectUsingSkip(clazz, ctor);

}

StringBuilder lines = new StringBuilder();

append(lines, "public static Object decode_(com.jsoniter.JsonIterator iter) {");

append(lines, "if (iter.readNull()) { return null; }");

if (ctor.parameters.isEmpty()) {

// has default ctor

append(lines, "{{clazz}} obj = {{newInst}};");

append(lines, "if (!com.jsoniter.CodegenAccess.readObjectStart(iter)) { return obj; }");

} else {

// ctor requires binding

for (Binding parameter : ctor.parameters) {

appendVarDef(lines, parameter);

}

append(lines, "if (!com.jsoniter.CodegenAccess.readObjectStart(iter)) { return {{newInst}}; }");

for (Binding field : fields) {

appendVarDef(lines, field);

}

for (CustomizedSetter setter : setters) {

for (Binding param : setter.parameters) {

appendVarDef(lines, param);

}

append(lines, "com.jsoniter.CodegenAccess.resetExistingObject(iter);");

append(lines, "switch (com.jsoniter.CodegenAccess.readObjectFieldAsHash(iter)) {");

HashSet<Integer> knownHashes = new HashSet<Integer>();

for (Binding field : allBindings) {

for (String fromName : field.fromNames) {

long hash = 0x811c9dc5;

for (byte b : fromName.getBytes()) {

hash ^= b;

hash *= 0x1000193;

}

int intHash = (int) hash;

if (intHash == 0) {

// hash collision, 0 can not be used as sentinel

return genObjectUsingSlice(clazz, cacheKey, ctor, setters, fields);

}

if (knownHashes.contains(intHash)) {

// hash collision with other field can not be used as sentinel

return genObjectUsingSlice(clazz, cacheKey, ctor, setters, fields);

}

knownHashes.add(intHash);

append(lines, "case " + intHash + ": ");

appendFieldSet(lines, cacheKey, ctor, fields, field);

append(lines, "break;");

}

append(lines, "default:");

append(lines, "iter.skip();");

append(lines, "}");

append(lines, "while (com.jsoniter.CodegenAccess.nextToken(iter) == ',') {");

append(lines, "switch (com.jsoniter.CodegenAccess.readObjectFieldAsHash(iter)) {");

for (Binding field : allBindings) {

for (String fromName : field.fromNames) {

long hash = 0x811c9dc5;

for (byte b : fromName.getBytes()) {

hash ^= b;

hash *= 0x1000193;

}

int intHash = (int) hash;

append(lines, "case " + intHash + ": ");

appendFieldSet(lines, cacheKey, ctor, fields, field);

append(lines, "continue;");

}

append(lines, "}");

append(lines, "iter.skip();");

append(lines, "}");

if (!ctor.parameters.isEmpty()) {

append(lines, CodegenImplNative.getTypeName(clazz) + " obj = {{newInst}};");

for (Binding field : fields) {

append(lines, String.format("obj.%s = _%s_;", field.name, field.name));

}

appendSetter(setters, lines);

append(lines, "return obj;");

append(lines, "}");

return lines.toString()

.replace("{{clazz}}", clazz.getCanonicalName())

.replace("{{newInst}}", genNewInstCode(clazz, ctor));

}

private static void appendFieldSet(StringBuilder lines, String cacheKey, CustomizedConstructor ctor, List<Binding> fields, Binding field) {

if (ctor.parameters.isEmpty() && fields.contains(field)) {

if (!shouldReuseObject(field.valueType)) {

append(lines, String.format("com.jsoniter.CodegenAccess.setExistingObject(iter, obj.%s);", field.name));

}

append(lines, String.format("obj.%s = %s;", field.name, CodegenImplNative.genField(field, cacheKey)));

} else {

append(lines, String.format("_%s_ = %s;", field.name, CodegenImplNative.genField(field, cacheKey)));

}

private static void appendSetter(List<CustomizedSetter> setters, StringBuilder lines) {

for (CustomizedSetter setter : setters) {

lines.append("obj.");

lines.append(setter.methodName);

appendInvocation(lines, setter.parameters);

lines.append(";\n");

}

private static void appendVarDef(StringBuilder lines, Binding parameter) {

String typeName = CodegenImplNative.getTypeName(parameter.valueType);

append(lines, String.format("%s _%s_ = %s;", typeName, parameter.name, DEFAULT_VALUES.get(typeName)));

}

private static String genObjectUsingSkip(Class clazz, CustomizedConstructor ctor) {

StringBuilder lines = new StringBuilder();

append(lines, "public static Object decode_(com.jsoniter.JsonIterator iter) {");

append(lines, "if (iter.readNull()) { return null; }");

append(lines, "{{clazz}} obj = {{newInst}};");

append(lines, "iter.skip();");

append(lines, "return obj;");

append(lines, "}");

return lines.toString()

.replace("{{clazz}}", clazz.getCanonicalName())

.replace("{{newInst}}", genNewInstCode(clazz, ctor));

}

private static String genNewInstCode(Class clazz, CustomizedConstructor ctor) {

StringBuilder code = new StringBuilder();

if (ctor.parameters.isEmpty()) {

// nothing to bind, safe to reuse existing object

code.append("(com.jsoniter.CodegenAccess.existingObject(iter) == null ? ");

}

if (ctor.staticMethodName == null) {

code.append(String.format("new %s", clazz.getCanonicalName()));

} else {

code.append(String.format("%s.%s", clazz.getCanonicalName(), ctor.staticMethodName));

}

List<Binding> params = ctor.parameters;

appendInvocation(code, params);

if (ctor.parameters.isEmpty()) {

// nothing to bind, safe to reuse existing object

code.append(String.format(" : (%s)com.jsoniter.CodegenAccess.existingObject(iter))", clazz.getCanonicalName()));

}

return code.toString();

}

private static void appendInvocation(StringBuilder code, List<Binding> params) {

code.append("(");

boolean isFirst = true;

for (Binding ctorParam : params) {

if (isFirst) {

isFirst = false;

} else {

code.append(",");

}

code.append(String.format("_%s_", ctorParam.name));

}

code.append(")");

}

private static void append(StringBuilder lines, String str) {

lines.append(str);

lines.append("\n");

}

public static boolean shouldReuseObject(Type valueType) {

if (valueType instanceof Class) {

Class clazz = (Class) valueType;

if (clazz.isArray()) {

return false;

}

return CodegenImplNative.isNative(valueType);

}

java/src/main/java/com/jsoniter/CodegenImplObject.java at master · akan/java · GitHub

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