com.squareup.javapoet.AnnotationSpec.java Source code

Introduction

Here is the source code for com.squareup.javapoet.AnnotationSpec.java

Source

/*
 * Copyright (C) 2015 Square, 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.
 */
package com.squareup.javapoet;

import com.google.common.base.Supplier;
import com.google.common.collect.ImmutableListMultimap;
import com.google.common.collect.ImmutableMultimap;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Multimap;
import com.google.common.collect.Multimaps;
import java.io.IOException;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.TreeMap;

import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.collect.Iterables.getOnlyElement;

/** A generated annotation on a declaration. */
public final class AnnotationSpec {
    public final Type type;
    public final ImmutableMultimap<String, CodeBlock> members;

    private AnnotationSpec(Builder builder) {
        this.type = builder.type;
        this.members = ImmutableListMultimap.copyOf(builder.members);
    }

    void emit(CodeWriter codeWriter, boolean inline) throws IOException {
        String whitespace = inline ? "" : "\n";
        String memberSeparator = inline ? ", " : ",\n";
        if (members.isEmpty()) {
            // @Singleton
            codeWriter.emit("@$T", type);
        } else if (members.keySet().equals(ImmutableSet.of("value"))) {
            // @Named("foo")
            codeWriter.emit("@$T(", type);
            emitAnnotationValue(codeWriter, whitespace, memberSeparator, members.values());
            codeWriter.emit(")");
        } else {
            // Inline:
            //   @Column(name = "updated_at", nullable = false)
            //
            // Not inline:
            //   @Column(
            //       name = "updated_at",
            //       nullable = false
            //   )
            codeWriter.emit("@$T(" + whitespace, type);
            codeWriter.indent(2);
            for (Iterator<Map.Entry<String, Collection<CodeBlock>>> i = members.asMap().entrySet().iterator(); i
                    .hasNext();) {
                Map.Entry<String, Collection<CodeBlock>> entry = i.next();
                codeWriter.emit("$L = ", entry.getKey());
                emitAnnotationValue(codeWriter, whitespace, memberSeparator, entry.getValue());
                if (i.hasNext())
                    codeWriter.emit(memberSeparator);
            }
            codeWriter.unindent(2);
            codeWriter.emit(whitespace + ")");
        }
    }

    private void emitAnnotationValue(CodeWriter codeWriter, String whitespace, String memberSeparator,
            Collection<CodeBlock> value) throws IOException {
        if (value.size() == 1) {
            codeWriter.indent(2);
            codeWriter.emit(getOnlyElement(value));
            codeWriter.unindent(2);
            return;
        }

        codeWriter.emit("{" + whitespace);
        codeWriter.indent(2);
        boolean first = true;
        for (CodeBlock codeBlock : value) {
            if (!first)
                codeWriter.emit(memberSeparator);
            codeWriter.emit(codeBlock);
            first = false;
        }
        codeWriter.unindent(2);
        codeWriter.emit(whitespace + "}");
    }

    public static Builder builder(Type type) {
        checkNotNull(type, "type == null");
        return new Builder(type);
    }

    @Override
    public boolean equals(Object o) {
        return o instanceof AnnotationSpec && ((AnnotationSpec) o).type.equals(type)
                && ((AnnotationSpec) o).members.equals(members);
    }

    @Override
    public int hashCode() {
        return type.hashCode() + 37 * members.hashCode();
    }

    public static final class Builder {
        private final Type type;
        private final Multimap<String, CodeBlock> members = Multimaps.newListMultimap(
                new TreeMap<String, Collection<CodeBlock>>(), AnnotationSpec.<CodeBlock>listSupplier());

        private Builder(Type type) {
            this.type = type;
        }

        public Builder addMember(String name, String format, Object... args) {
            members.put(name, CodeBlock.builder().add(format, args).build());
            return this;
        }

        public AnnotationSpec build() {
            return new AnnotationSpec(this);
        }
    }

    private static <T> Supplier<List<T>> listSupplier() {
        return new Supplier<List<T>>() {
            @Override
            public List<T> get() {
                return new ArrayList<>();
            }
        };
    }
}