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com.getperka.flatpack.fast.JavaDialect Maven / Gradle / Ivy
/*
* #%L
* FlatPack Automatic Source Tool
* %%
* Copyright (C) 2012 Perka Inc.
* %%
* 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.
* #L%
*/
package com.getperka.flatpack.fast;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.io.Writer;
import java.net.HttpURLConnection;
import java.net.URLDecoder;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Set;
import java.util.regex.Pattern;
import javax.annotation.security.PermitAll;
import javax.annotation.security.RolesAllowed;
import javax.persistence.Embedded;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.stringtemplate.v4.AttributeRenderer;
import org.stringtemplate.v4.AutoIndentWriter;
import org.stringtemplate.v4.Interpreter;
import org.stringtemplate.v4.ST;
import org.stringtemplate.v4.STGroup;
import org.stringtemplate.v4.STGroupFile;
import org.stringtemplate.v4.misc.ObjectModelAdaptor;
import org.stringtemplate.v4.misc.STNoSuchPropertyException;
import com.getperka.cli.flags.Flag;
import com.getperka.flatpack.BaseHasUuid;
import com.getperka.flatpack.FlatPack;
import com.getperka.flatpack.FlatPackEntity;
import com.getperka.flatpack.InheritPrincipal;
import com.getperka.flatpack.JsonTypeName;
import com.getperka.flatpack.SuppressDefaultValue;
import com.getperka.flatpack.TypeReference;
import com.getperka.flatpack.TypeSource;
import com.getperka.flatpack.client.FlatPackRequest;
import com.getperka.flatpack.client.Request;
import com.getperka.flatpack.client.dto.ApiDescription;
import com.getperka.flatpack.client.dto.EndpointDescription;
import com.getperka.flatpack.client.dto.EntityDescription;
import com.getperka.flatpack.client.dto.ParameterDescription;
import com.getperka.flatpack.client.impl.ApiBase;
import com.getperka.flatpack.client.impl.ConnectionRequestBase;
import com.getperka.flatpack.client.impl.FlatPackRequestBase;
import com.getperka.flatpack.ext.Property;
import com.getperka.flatpack.ext.Type;
import com.getperka.flatpack.ext.TypeHint;
import com.getperka.flatpack.util.FlatPackCollections;
import com.getperka.flatpack.util.FlatPackTypes;
/**
* Generates simple Java POJO representations of a FlatPack API.
*/
public class JavaDialect implements Dialect {
@Flag(tag = "packageName",
help = "The name of the package that generated sources should belong to",
defaultValue = "com.getperka.fast")
static String packageName;
@Flag(tag = "typePrefix", help = "A prefix to apply to all generated type names",
defaultValue = "")
static String typePrefix;
private static final Charset UTF8 = Charset.forName("UTF8");
private static final List> WELL_KNOWN_TYPES = Arrays.> asList(
ApiBase.class, Arrays.class, ConnectionRequestBase.class, Collections.class, Embedded.class,
FlatPack.class, FlatPackEntity.class, FlatPackRequest.class, FlatPackRequestBase.class,
FlatPackTypes.class, HashSet.class, HttpURLConnection.class, InheritPrincipal.class,
IOException.class, JsonTypeName.class, PermitAll.class, Request.class, RolesAllowed.class,
Set.class, SuppressDefaultValue.class, TypeReference.class, TypeSource.class);
private static String upcase(String typeName) {
return Character.toUpperCase(typeName.charAt(0)) + typeName.substring(1);
}
private final Logger logger = LoggerFactory.getLogger(getClass());
/**
* Used at the end of the code-generation process to emit referenced enum values.
*/
private Set usedEnums = new LinkedHashSet();
@Override
public void generate(ApiDescription api, File outputDir) throws IOException {
STGroup group = loadGroup();
File packageDir = new File(outputDir, packageName.replace('.', '/'));
if (!packageDir.isDirectory() && !packageDir.mkdirs()) {
logger.error("Could not create output directory {}", packageDir.getPath());
return;
}
Map allEntities = FlatPackCollections.mapForIteration();
for (EntityDescription entity : api.getEntities()) {
allEntities.put(entity.getTypeName(), entity);
for (Iterator it = entity.getProperties().iterator(); it.hasNext();) {
Property prop = it.next();
if ("uuid".equals(prop.getName())) {
// Crop the UUID property
it.remove();
} else if (!prop.getEnclosingTypeName().equals(entity.getTypeName())) {
// Remove properties not declared in the current type
it.remove();
}
}
}
// Ensure that the "real" implementations are used
allEntities.remove("baseHasUuid");
allEntities.remove("hasUuid");
// Render entities
for (EntityDescription entity : allEntities.values()) {
ST entityST = group.getInstanceOf("entity")
.add("entity", entity)
.add("packageName", packageName);
render(entityST, packageDir, typePrefix + upcase(entity.getTypeName()));
}
// Render referenced enumerations
for (Type enumType : usedEnums) {
ST enumST = group.getInstanceOf("enum")
.add("enum", enumType)
.add("packageName", packageName);
render(enumST, packageDir, typePrefix + upcase(enumType.getName()));
}
String namePrefix = upcase(packageName.substring(packageName.lastIndexOf('.') + 1));
// Render the Api convenience class
ST apiST = group.getInstanceOf("api")
.add("api", api)
.add("packageName", packageName)
.add("namePrefix", namePrefix);
render(apiST, packageDir, namePrefix + "Api");
// Emit a manifest of all generated types
ST typeSourceST = group.getInstanceOf("typeSource")
.add("allEntities", allEntities.values())
.add("packageName", packageName)
.add("namePrefix", namePrefix);
render(typeSourceST, packageDir, namePrefix + "TypeSource");
}
@Override
public String getDialectName() {
return "java";
}
/**
* Load {@code java.stg} from the classpath and configure a number of model adaptors to add
* virtual properties to the objects being rendered.
*/
private STGroup loadGroup() {
STGroup group = new STGroupFile(getClass().getResource("java.stg"), "UTF8", '<', '>');
// EntityDescription are rendered as the FQN
group.registerRenderer(EntityDescription.class, new AttributeRenderer() {
@Override
public String toString(Object o, String formatString, Locale locale) {
EntityDescription entity = (EntityDescription) o;
if (entity.getTypeName().equals("baseHasUuid")) {
return BaseHasUuid.class.getCanonicalName();
}
return packageName + "." + typePrefix + upcase(entity.getTypeName());
}
});
// Types are registered as FQPN
group.registerRenderer(Type.class, new AttributeRenderer() {
@Override
public String toString(Object o, String formatString, Locale locale) {
Type type = (Type) o;
return toString(type);
}
protected String toString(Type type) {
switch (type.getJsonKind()) {
case ANY:
return Object.class.getCanonicalName();
case BOOLEAN:
return Boolean.class.getCanonicalName();
case DOUBLE:
return Double.class.getCanonicalName();
case INTEGER:
return Integer.class.getCanonicalName();
case LIST:
return List.class.getCanonicalName() + "<" + toString(type.getListElement()) + ">";
case MAP:
return Map.class.getCanonicalName() + "<" + toString(type.getMapKey()) + ","
+ toString(type.getMapValue()) + ">";
case NULL:
return Void.class.getCanonicalName();
case STRING: {
// Look for the presence of enum values
if (type.getEnumValues() != null) {
// Register a referenced enum
usedEnums.add(type);
return typePrefix + upcase(type.getName());
}
// Any other named type must be an entity type
if (type.getName() != null) {
return typePrefix + upcase(type.getName());
}
// Look for a type hint
TypeHint hint = type.getTypeHint();
if (hint != null) {
return hint.getValue();
}
// Otherwise it must be a plain string
return String.class.getCanonicalName();
}
}
throw new UnsupportedOperationException("Unknown JsonKind " + type.getJsonKind());
}
});
group.registerModelAdaptor(EndpointDescription.class, new ObjectModelAdaptor() {
@Override
public Object getProperty(Interpreter interp, ST self, Object o, Object property,
String propertyName) throws STNoSuchPropertyException {
EndpointDescription end = (EndpointDescription) o;
if ("combinedArgs".equals(propertyName)) {
// Return the path and query parameters together
List toReturn = new ArrayList();
if (end.getPathParameters() != null) {
toReturn.addAll(end.getPathParameters());
}
if (end.getQueryParameters() != null) {
toReturn.addAll(end.getQueryParameters());
}
return toReturn;
} else if ("javaName".equals(propertyName) || "javaNameUpcase".equals(propertyName)) {
// Convert a path like /api/2/foo/bar/{}/baz to fooBarBazMethod
String path = end.getPath();
String[] parts = path.split(Pattern.quote("/"));
StringBuilder sb = new StringBuilder();
for (int i = 3, j = parts.length; i < j; i++) {
try {
String part = parts[i];
if (part.length() == 0) {
continue;
}
StringBuilder decodedPart = new StringBuilder(URLDecoder.decode(part, "UTF8"));
// Trim characters that aren't legal
for (int k = decodedPart.length() - 1; k >= 0; k--) {
if (!Character.isJavaIdentifierPart(decodedPart.charAt(k))) {
decodedPart.deleteCharAt(k);
}
}
// Append the new name part, using camel-cased names
String newPart = decodedPart.toString();
if (sb.length() > 0) {
newPart = upcase(newPart);
}
sb.append(newPart);
} catch (UnsupportedEncodingException e) {
throw new RuntimeException(e);
}
}
sb.append(upcase(end.getMethod().toLowerCase()));
String javaName = sb.toString();
if ("javaNameUpcase".equals(propertyName)) {
javaName = upcase(javaName);
}
return javaName;
} else if ("pathDecoded".equals(propertyName)) {
// URL-decode the path in the endpoint description
try {
String decoded = URLDecoder.decode(end.getPath(), "UTF8");
return decoded;
} catch (UnsupportedEncodingException e) {
throw new RuntimeException(e);
}
}
return super.getProperty(interp, self, o, property, propertyName);
}
});
group.registerModelAdaptor(EntityDescription.class, new ObjectModelAdaptor() {
@Override
public Object getProperty(Interpreter interp, ST self, Object o, Object property,
String propertyName) throws STNoSuchPropertyException {
EntityDescription entity = (EntityDescription) o;
if ("payloadName".equals(propertyName)) {
return entity.getTypeName();
} else if ("supertype".equals(propertyName)) {
EntityDescription supertype = entity.getSupertype();
if (supertype == null) {
return BaseHasUuid.class.getCanonicalName();
} else {
return supertype;
}
} else if ("simpleName".equals(propertyName)) {
return typePrefix + upcase(entity.getTypeName());
}
return super.getProperty(interp, self, o, property, propertyName);
}
});
group.registerModelAdaptor(ParameterDescription.class, new ObjectModelAdaptor() {
@Override
public Object getProperty(Interpreter interp, ST self, Object o, Object property,
String propertyName) throws STNoSuchPropertyException {
ParameterDescription param = (ParameterDescription) o;
if ("javaNameUpcase".equals(propertyName)) {
return upcase(param.getName());
}
return super.getProperty(interp, self, o, property, propertyName);
}
});
group.registerModelAdaptor(Property.class, new ObjectModelAdaptor() {
@Override
public Object getProperty(Interpreter interp, ST self, Object o, Object property,
String propertyName) throws STNoSuchPropertyException {
Property p = (Property) o;
if ("getterName".equals(propertyName)) {
return upcase(p.getName());
} else if ("getterPermitAll".equals(propertyName)) {
return Collections.singleton("*").equals(p.getGetterRoleNames());
} else if ("setterPermitAll".equals(propertyName)) {
return Collections.singleton("*").equals(p.getSetterRoleNames());
}
return super.getProperty(interp, self, o, property, propertyName);
}
});
group.registerModelAdaptor(Type.class, new ObjectModelAdaptor() {
@Override
public Object getProperty(Interpreter interp, ST self, Object o, Object property,
String propertyName) throws STNoSuchPropertyException {
Type type = (Type) o;
if ("flatTypes".equals(propertyName)) {
return flatten(type);
}
return super.getProperty(interp, self, o, property, propertyName);
}
private List flatten(Type type) {
switch (type.getJsonKind()) {
case ANY:
return Collections.singletonList(Object.class.getCanonicalName());
case BOOLEAN:
return Collections.singletonList(Boolean.class.getCanonicalName());
case DOUBLE:
return Collections.singletonList(Double.class.getCanonicalName());
case INTEGER:
return Collections.singletonList(Integer.class.getCanonicalName());
case LIST: {
List toReturn = new ArrayList();
toReturn.add(List.class.getCanonicalName());
toReturn.addAll(flatten(type.getListElement()));
return toReturn;
}
case MAP: {
List toReturn = new ArrayList();
toReturn.add(Map.class.getCanonicalName());
toReturn.addAll(flatten(type.getMapKey()));
toReturn.addAll(flatten(type.getMapValue()));
return toReturn;
}
case NULL:
return Collections.singletonList(Void.class.getCanonicalName());
case STRING: {
if (type.getName() != null) {
return Collections.singletonList(typePrefix + upcase(type.getName()));
} else if (type.getTypeHint() != null) {
return Collections.singletonList(type.getTypeHint().getValue());
} else {
return Collections.singletonList(String.class.getCanonicalName());
}
}
}
throw new UnsupportedOperationException("Unknown JsonKind " + type.getJsonKind());
}
});
group.registerModelAdaptor(String.class, new ObjectModelAdaptor() {
@Override
public Object getProperty(Interpreter interp, ST self, Object o, Object property,
String propertyName) throws STNoSuchPropertyException {
final String string = (String) o;
if ("chunks".equals(propertyName)) {
/*
* Split a string into individual chunks that can be reflowed. This implementation is
* pretty simplistic, but helps make the generated documentation at least somewhat more
* readable.
*/
return new Iterator() {
int index;
int length = string.length();
CharSequence next;
{
advance();
}
@Override
public boolean hasNext() {
return next != null;
}
@Override
public CharSequence next() {
CharSequence toReturn = next;
advance();
return toReturn;
}
@Override
public void remove() {
throw new UnsupportedOperationException();
}
private void advance() {
int start = advance(false);
int end = advance(true);
if (start == end) {
next = null;
} else {
next = string.subSequence(start, end);
}
}
/**
* Advance to next non-whitespace character.
*/
private int advance(boolean whitespace) {
while (index < length
&& (whitespace ^ Character.isWhitespace(string.charAt(index)))) {
index++;
}
return index;
}
};
}
return super.getProperty(interp, self, o, property, propertyName);
}
});
Map namesMap = new HashMap();
for (Class clazz : WELL_KNOWN_TYPES) {
namesMap.put(clazz.getSimpleName(), clazz.getCanonicalName());
}
group.defineDictionary("names", namesMap);
return group;
}
private void render(ST enumST, File packageDir, String typeName) throws IOException {
Writer fileWriter = new OutputStreamWriter(
new FileOutputStream(new File(packageDir, typeName + ".java")), UTF8);
AutoIndentWriter writer = new AutoIndentWriter(fileWriter);
writer.setLineWidth(80);
enumST.write(writer);
fileWriter.close();
}
}
