io.soliton.protobuf.plugin.TypeMap.java Source code

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Here is the source code for io.soliton.protobuf.plugin.TypeMap.java

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/**
 * Copyright 2013 Julien Silland
 *
 * 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 io.soliton.protobuf.plugin;

import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.CaseFormat;
import com.google.common.base.Objects;
import com.google.common.base.Splitter;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Iterables;
import com.google.protobuf.DescriptorProtos.DescriptorProto;
import com.google.protobuf.DescriptorProtos.FileDescriptorProto;
import com.google.protobuf.DescriptorProtos.FileOptions;

/**
 * Keeps a tab on the known protobuf message types and their associated Java
 * type.
 *
 * @author Julien Silland (julien@soliton.io)
 */
public class TypeMap {

    private final ImmutableMap<String, JavaType> types;

    private TypeMap(ImmutableMap<String, JavaType> types) {
        this.types = types;
    }

    public static TypeMap of(FileDescriptorProto protoFile) {
        ImmutableMap.Builder<String, JavaType> types = ImmutableMap.builder();
        FileOptions options = protoFile.getOptions();

        String protoPackage = "." + (protoFile.hasPackage() ? protoFile.getPackage() : "");
        String javaPackage = options.hasJavaPackage() ? options.getJavaPackage()
                : protoFile.hasPackage() ? protoFile.getPackage() : null;
        String enclosingClass = options.getJavaMultipleFiles() ? null
                : options.hasJavaOuterClassname() ? options.getJavaOuterClassname()
                        : createOuterJavaClassname(protoFile.getName());

        for (DescriptorProto message : protoFile.getMessageTypeList()) {
            types.put(protoPackage + "." + message.getName(),
                    new JavaType(javaPackage, enclosingClass, message.getName()));
        }

        return new TypeMap(types.build());
    }

    /**
     * @param name
     * @return
     */
    @VisibleForTesting
    static String createOuterJavaClassname(String name) {
        if (name.endsWith(".proto")) {
            name = name.substring(0, name.length() - ".proto".length());
        }
        name = Iterables.getLast(Splitter.on('/').split(name));
        name = name.replace('-', '_');
        name = CaseFormat.LOWER_UNDERSCORE.to(CaseFormat.UPPER_CAMEL, name);
        return Character.toUpperCase(name.charAt(0)) + name.substring(1);
    }

    public JavaType lookup(String name) {
        return types.get(name);
    }

    public TypeMap mergeWith(TypeMap other) {
        return null;
    }

    @Override
    public String toString() {
        return Objects.toStringHelper(this).add("Types", types).toString();
    }
}