com.jsoniter.CodegenImplArray Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of jsoniter Show documentation
Show all versions of jsoniter Show documentation
jsoniter (json-iterator) is fast and flexible JSON parser available in Java and Go
package com.jsoniter;
import java.lang.reflect.Type;
import java.util.*;
class CodegenImplArray {
final static Set WITH_CAPACITY_COLLECTION_CLASSES = new HashSet() {{
add(ArrayList.class);
add(HashSet.class);
add(Vector.class);
}};
public static String genArray(Class clazz) {
Class compType = clazz.getComponentType();
if (compType.isArray()) {
throw new IllegalArgumentException("nested array not supported: " + clazz.getCanonicalName());
}
StringBuilder lines = new StringBuilder();
append(lines, "com.jsoniter.CodegenAccess.resetExistingObject(iter);");
append(lines, "byte nextToken = com.jsoniter.CodegenAccess.readByte(iter);");
append(lines, "if (nextToken != '[') {");
append(lines, "if (nextToken == 'n') {");
append(lines, "com.jsoniter.CodegenAccess.skipFixedBytes(iter, 3);");
append(lines, "com.jsoniter.CodegenAccess.resetExistingObject(iter); return null;");
append(lines, "} else {");
append(lines, "nextToken = com.jsoniter.CodegenAccess.nextToken(iter);");
append(lines, "if (nextToken == 'n') {");
append(lines, "com.jsoniter.CodegenAccess.skipFixedBytes(iter, 3);");
append(lines, "com.jsoniter.CodegenAccess.resetExistingObject(iter); return null;");
append(lines, "}");
append(lines, "}");
append(lines, "}");
append(lines, "nextToken = com.jsoniter.CodegenAccess.nextToken(iter);");
append(lines, "if (nextToken == ']') {");
append(lines, "return new {{comp}}[0];");
append(lines, "}");
append(lines, "com.jsoniter.CodegenAccess.unreadByte(iter);");
append(lines, "{{comp}} a1 = {{op}};");
append(lines, "if (!com.jsoniter.CodegenAccess.nextTokenIsComma(iter)) {");
append(lines, "return new {{comp}}[]{ a1 };");
append(lines, "}");
append(lines, "{{comp}} a2 = {{op}};");
append(lines, "if (!com.jsoniter.CodegenAccess.nextTokenIsComma(iter)) {");
append(lines, "return new {{comp}}[]{ a1, a2 };");
append(lines, "}");
append(lines, "{{comp}} a3 = {{op}};");
append(lines, "if (!com.jsoniter.CodegenAccess.nextTokenIsComma(iter)) {");
append(lines, "return new {{comp}}[]{ a1, a2, a3 };");
append(lines, "}");
append(lines, "{{comp}} a4 = ({{comp}}) {{op}};");
append(lines, "if (!com.jsoniter.CodegenAccess.nextTokenIsComma(iter)) {");
append(lines, "return new {{comp}}[]{ a1, a2, a3, a4 };");
append(lines, "}");
append(lines, "{{comp}} a5 = ({{comp}}) {{op}};");
append(lines, "{{comp}}[] arr = new {{comp}}[10];");
append(lines, "arr[0] = a1;");
append(lines, "arr[1] = a2;");
append(lines, "arr[2] = a3;");
append(lines, "arr[3] = a4;");
append(lines, "arr[4] = a5;");
append(lines, "int i = 5;");
append(lines, "while (com.jsoniter.CodegenAccess.nextTokenIsComma(iter)) {");
append(lines, "if (i == arr.length) {");
append(lines, "{{comp}}[] newArr = new {{comp}}[arr.length * 2];");
append(lines, "System.arraycopy(arr, 0, newArr, 0, arr.length);");
append(lines, "arr = newArr;");
append(lines, "}");
append(lines, "arr[i++] = {{op}};");
append(lines, "}");
// append(lines, "if (c != ']') { com.jsoniter.CodegenAccess.reportIncompleteArray(iter); }");
append(lines, "{{comp}}[] result = new {{comp}}[i];");
append(lines, "System.arraycopy(arr, 0, result, 0, i);");
append(lines, "return result;");
return lines.toString().replace(
"{{comp}}", compType.getCanonicalName()).replace(
"{{op}}", CodegenImplNative.genReadOp(compType));
}
public static String genCollection(Class clazz, Type[] typeArgs) {
if (WITH_CAPACITY_COLLECTION_CLASSES.contains(clazz)) {
return CodegenImplArray.genCollectionWithCapacity(clazz, typeArgs[0]);
} else {
return CodegenImplArray.genCollectionWithoutCapacity(clazz, typeArgs[0]);
}
}
private static String genCollectionWithCapacity(Class clazz, Type compType) {
StringBuilder lines = new StringBuilder();
append(lines, "{{clazz}} col = ({{clazz}})com.jsoniter.CodegenAccess.resetExistingObject(iter);");
append(lines, "if (iter.readNull()) { com.jsoniter.CodegenAccess.resetExistingObject(iter); return null; }");
append(lines, "if (!com.jsoniter.CodegenAccess.readArrayStart(iter)) {");
append(lines, "return col == null ? new {{clazz}}(0): ({{clazz}})com.jsoniter.CodegenAccess.reuseCollection(col);");
append(lines, "}");
append(lines, "Object a1 = {{op}};");
append(lines, "if (com.jsoniter.CodegenAccess.nextToken(iter) != ',') {");
append(lines, "{{clazz}} obj = col == null ? new {{clazz}}(1): ({{clazz}})com.jsoniter.CodegenAccess.reuseCollection(col);");
append(lines, "obj.add(a1);");
append(lines, "return obj;");
append(lines, "}");
append(lines, "Object a2 = {{op}};");
append(lines, "if (com.jsoniter.CodegenAccess.nextToken(iter) != ',') {");
append(lines, "{{clazz}} obj = col == null ? new {{clazz}}(2): ({{clazz}})com.jsoniter.CodegenAccess.reuseCollection(col);");
append(lines, "obj.add(a1);");
append(lines, "obj.add(a2);");
append(lines, "return obj;");
append(lines, "}");
append(lines, "Object a3 = {{op}};");
append(lines, "if (com.jsoniter.CodegenAccess.nextToken(iter) != ',') {");
append(lines, "{{clazz}} obj = col == null ? new {{clazz}}(3): ({{clazz}})com.jsoniter.CodegenAccess.reuseCollection(col);");
append(lines, "obj.add(a1);");
append(lines, "obj.add(a2);");
append(lines, "obj.add(a3);");
append(lines, "return obj;");
append(lines, "}");
append(lines, "Object a4 = {{op}};");
append(lines, "{{clazz}} obj = col == null ? new {{clazz}}(8): ({{clazz}})com.jsoniter.CodegenAccess.reuseCollection(col);");
append(lines, "obj.add(a1);");
append(lines, "obj.add(a2);");
append(lines, "obj.add(a3);");
append(lines, "obj.add(a4);");
append(lines, "while (com.jsoniter.CodegenAccess.nextToken(iter) == ',') {");
append(lines, "obj.add({{op}});");
append(lines, "}");
append(lines, "return obj;");
return lines.toString().replace(
"{{clazz}}", clazz.getName()).replace(
"{{op}}", CodegenImplNative.genReadOp(compType));
}
private static String genCollectionWithoutCapacity(Class clazz, Type compType) {
StringBuilder lines = new StringBuilder();
append(lines, "if (iter.readNull()) { com.jsoniter.CodegenAccess.resetExistingObject(iter); return null; }");
append(lines, "{{clazz}} col = ({{clazz}})com.jsoniter.CodegenAccess.resetExistingObject(iter);");
append(lines, "if (!com.jsoniter.CodegenAccess.readArrayStart(iter)) {");
append(lines, "return col == null ? new {{clazz}}(): ({{clazz}})com.jsoniter.CodegenAccess.reuseCollection(col);");
append(lines, "}");
append(lines, "Object a1 = {{op}};");
append(lines, "if (com.jsoniter.CodegenAccess.nextToken(iter) != ',') {");
append(lines, "{{clazz}} obj = col == null ? new {{clazz}}(): ({{clazz}})com.jsoniter.CodegenAccess.reuseCollection(col);");
append(lines, "obj.add(a1);");
append(lines, "return obj;");
append(lines, "}");
append(lines, "Object a2 = {{op}};");
append(lines, "if (com.jsoniter.CodegenAccess.nextToken(iter) != ',') {");
append(lines, "{{clazz}} obj = col == null ? new {{clazz}}(): ({{clazz}})com.jsoniter.CodegenAccess.reuseCollection(col);");
append(lines, "obj.add(a1);");
append(lines, "obj.add(a2);");
append(lines, "return obj;");
append(lines, "}");
append(lines, "Object a3 = {{op}};");
append(lines, "if (com.jsoniter.CodegenAccess.nextToken(iter) != ',') {");
append(lines, "{{clazz}} obj = col == null ? new {{clazz}}(): ({{clazz}})com.jsoniter.CodegenAccess.reuseCollection(col);");
append(lines, "obj.add(a1);");
append(lines, "obj.add(a2);");
append(lines, "obj.add(a3);");
append(lines, "return obj;");
append(lines, "}");
append(lines, "Object a4 = {{op}};");
append(lines, "{{clazz}} obj = col == null ? new {{clazz}}(): ({{clazz}})com.jsoniter.CodegenAccess.reuseCollection(col);");
append(lines, "obj.add(a1);");
append(lines, "obj.add(a2);");
append(lines, "obj.add(a3);");
append(lines, "obj.add(a4);");
append(lines, "while (com.jsoniter.CodegenAccess.nextToken(iter) == ',') {");
append(lines, "obj.add({{op}});");
append(lines, "}");
// append(lines, "if (c != ']') { com.jsoniter.CodegenAccess.reportIncompleteArray(iter); }");
append(lines, "return obj;");
return lines.toString().replace(
"{{clazz}}", clazz.getName()).replace(
"{{op}}", CodegenImplNative.genReadOp(compType));
}
private static void append(StringBuilder lines, String str) {
lines.append(str);
lines.append("\n");
}
}
© 2015 - 2025 Weber Informatics LLC | Privacy Policy