dagger2.internal.codegen.writer.MethodWriter.java Source code

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Here is the source code for dagger2.internal.codegen.writer.MethodWriter.java

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/*
 * Copyright (C) 2014 Google, 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 dagger2.internal.codegen.writer;

import com.google.common.base.Function;
import com.google.common.base.Optional;
import com.google.common.collect.FluentIterable;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterables;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import java.io.IOException;
import java.util.List;
import java.util.Map;
import java.util.Set;
import javax.lang.model.element.TypeElement;

import static com.google.common.base.Preconditions.checkArgument;

public final class MethodWriter extends Modifiable implements HasClassReferences, Writable {
    private final TypeName returnType;
    private final String name;
    private final Map<String, VariableWriter> parameterWriters;
    private final List<TypeVariableName> typeParameters;
    private Optional<BlockWriter> body;

    MethodWriter(TypeName returnType, String name) {
        this.returnType = returnType;
        this.name = name;
        this.parameterWriters = Maps.newLinkedHashMap();
        this.typeParameters = Lists.newArrayList();
        this.body = Optional.absent();
    }

    public String name() {
        return name;
    }

    public TypeName returnType() {
        return returnType;
    }

    public void addTypeParameter(TypeVariableName typeVariableName) {
        this.typeParameters.add(typeVariableName);
    }

    public void addTypeParameters(Iterable<TypeVariableName> typeVariableNames) {
        Iterables.addAll(typeParameters, typeVariableNames);
    }

    public VariableWriter addParameter(Class<?> type, String name) {
        return addParameter(ClassName.fromClass(type), name);
    }

    public VariableWriter addParameter(TypeElement type, String name) {
        return addParameter(ClassName.fromTypeElement(type), name);
    }

    public VariableWriter addParameter(TypeWriter type, String name) {
        return addParameter(type.name, name);
    }

    public VariableWriter addParameter(TypeName type, String name) {
        checkArgument(!parameterWriters.containsKey(name));
        VariableWriter parameterWriter = new VariableWriter(type, name);
        parameterWriters.put(name, parameterWriter);
        return parameterWriter;
    }

    public BlockWriter body() {
        if (body.isPresent()) {
            return body.get();
        } else {
            BlockWriter blockWriter = new BlockWriter();
            body = Optional.of(blockWriter);
            return blockWriter;
        }
    }

    @Override
    public Appendable write(Appendable appendable, Context context) throws IOException {
        writeAnnotations(appendable, context);
        writeModifiers(appendable);
        Writables.join(", ", typeParameters, "<", "> ", appendable, context);
        returnType.write(appendable, context);
        appendable.append(' ').append(name).append('(');
        Writables.join(", ", parameterWriters.values(), appendable, context);
        appendable.append(")");
        if (body.isPresent()) {
            appendable.append(" {");
            body.get().write(new IndentingAppendable(appendable), context);
            appendable.append("}\n");
        } else {
            appendable.append(";\n");
        }
        return appendable;
    }

    @Override
    public Set<ClassName> referencedClasses() {
        return FluentIterable
                .from(Iterables.concat(ImmutableList.of(returnType), parameterWriters.values(), body.asSet()))
                .transformAndConcat(new Function<HasClassReferences, Set<ClassName>>() {
                    @Override
                    public Set<ClassName> apply(HasClassReferences input) {
                        return input.referencedClasses();
                    }
                }).toSet();
    }
}