Java tutorial
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We also recommend that a * file or class name and description of purpose be included on the * same "printed page" as the copyright notice for easier * identification within third-party archives. * * Copyright 2014 Edgar Espina * * 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. */ package org.jooby.internal.apitool; import org.jooby.Route; import static org.jooby.internal.apitool.Filters.routeGroupOwner; import static org.jooby.internal.apitool.Insn.ldcFor; import org.objectweb.asm.Handle; import org.objectweb.asm.Opcodes; import org.objectweb.asm.Type; import org.objectweb.asm.tree.InvokeDynamicInsnNode; import org.objectweb.asm.tree.MethodInsnNode; import org.objectweb.asm.tree.MethodNode; import java.util.Arrays; import java.util.List; import java.util.Optional; import java.util.concurrent.atomic.AtomicInteger; import java.util.function.Predicate; import java.util.stream.Collectors; import java.util.stream.IntStream; import java.util.stream.Stream; class Lambda { public final String name; public final String pattern; public final String desc; public final String implementationName; public final String owner; public final String declaringClass; public final Optional<MethodNode> method; public final String tag; private Lambda(String declaringClass, MethodInsnNode method, Handle h) { this(declaringClass, h.getOwner(), h.getDesc(), h.getName(), method.name, null, null); } private Lambda(String declaringClass, String owner, String desc, String implementationName, String name, String pattern, MethodNode method) { this(declaringClass, owner, desc, implementationName, name, pattern, method, null); } private Lambda(String declaringClass, String owner, String desc, String implementationName, String name, String pattern, MethodNode method, String tag) { this.declaringClass = declaringClass; this.owner = owner; this.desc = desc; this.implementationName = implementationName; this.name = name.equals("use") || name.equals("all") ? "*" : name; this.pattern = pattern; this.method = Optional.ofNullable(method); this.tag = tag; } @Override public String toString() { return name + " " + pattern; } /** * Creates a new lambda and set a pattern prefix. * * @param prefix Prefix. * @return A new lambda. */ public Lambda prefix(String prefix) { return new Lambda(declaringClass, owner, desc, implementationName, name, Route.normalize(prefix + "/" + pattern), method.orElse(null), tag); } public Lambda tag(String tag) { if (this.tag != null || tag.startsWith("/:") || tag.startsWith("/{")) { // NOOP, keep the most specific return this; } return new Lambda(declaringClass, owner, desc, implementationName, name, pattern, method.orElse(null), tag); } /** * Creates a new lambda and set a pattern prefix. * * @param method Method node. * @return A new lambda. */ public Lambda method(MethodNode method) { return new Lambda(declaringClass, owner, desc, implementationName, name, pattern, method, tag); } public static Stream<Lambda> create(String owner, Optional<String> prefix, MethodInsnNode method, MethodNode implementation) { List<String> patterns = Insn.ldcFor(method).stream().map(it -> it.cst.toString()) .collect(Collectors.toList()); if (patterns.size() == 0) { patterns.add("/"); } prefix.ifPresent(p -> { IntStream.range(0, patterns.size()) .forEach(i -> patterns.set(i, Route.normalize(p + "/" + patterns.get(i)))); }); return patterns.stream().map(pattern -> { return new Lambda(owner, owner, implementation.desc, implementation.name, method.name.replace("$default", ""), pattern, implementation); }); } public static Stream<Lambda> create(ClassLoader loader, Predicate<MethodInsnNode> scriptRoute, String declaringClass, InvokeDynamicInsnNode node, MethodNode implementation) { return new Insn<>(null, node).next().filter(Filters.is(MethodInsnNode.class)).findFirst() .map(MethodInsnNode.class::cast).filter(scriptRoute).map(method -> { return Arrays.asList(node.bsmArgs).stream().filter(Handle.class::isInstance) .map(Handle.class::cast).findFirst().map(handle -> { Lambda lambda = new Lambda(declaringClass, method, handle); // Collect pattern List<Type> args = Arrays.asList(Type.getArgumentTypes(method.desc)); AtomicInteger count = new AtomicInteger(IntStream.range(0, args.size()) .filter(i -> !args.get(i).getClassName().equals(String.class.getName())) .findFirst().orElse(0)); int from = 0; // use(verb, pattern) if ("use".equals(method.name) && count.get() == 2) { from += 1; } MethodInsnNode start = method; // Instance method reference but not Static method reference: if ((!method.owner.equals(lambda.owner) && handle.getTag() != Opcodes.H_INVOKESTATIC) && !routeGroupOwner().test(method)) { // get("pattern", instance::methodReference) start = new Insn<>(null, method.getPrevious()).prev() .filter(Filters.is(MethodInsnNode.class)).findFirst() .map(MethodInsnNode.class::cast).orElse(method); } List<String> ldc = ldcFor(start).stream() .map(it -> Route.normalize(it.cst.toString())).collect(Collectors.toList()); if (routeGroupOwner().test(method)) { // use("/pattern") // .get(pattern?, () -> {}); new Insn<>(null, method).prev().filter(Filters.is(MethodInsnNode.class)) .map(MethodInsnNode.class::cast) .filter(Filters.call(loader, lambda.owner, "use", String.class)) .findFirst().ifPresent(use -> { List<String> prefix = ldcFor(use).stream() .map(it -> Route.normalize(it.cst.toString())) .collect(Collectors.toList()); if (ldc.size() == 0) { count.incrementAndGet(); ldc.add(""); } IntStream.range(0, ldc.size()) .forEach(i -> ldc.set(i, prefix.get(0) + ldc.get(i))); }); } if (ldc.size() == 0) { // default path: ldc.add("/"); count.incrementAndGet(); } return ldc.stream().skip(from).limit(Math.min(count.get(), ldc.size())) .flatMap(pattern -> Stream.of(new Lambda(lambda.declaringClass, lambda.owner, lambda.desc, lambda.implementationName, lambda.name, pattern, implementation))); }).orElse(Stream.of()); }).orElse(Stream.of()); } }