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

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Here is the source code for dagger2.internal.codegen.writer.Snippet.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.Joiner;
import com.google.common.collect.FluentIterable;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Iterables;
import java.io.IOException;
import java.util.Collections;
import java.util.Formatter;
import java.util.Iterator;
import java.util.Set;

public final class Snippet implements HasClassReferences, Writable {
    private final String format;
    private final ImmutableSet<TypeName> types;
    private final ImmutableList<Object> args;

    private Snippet(String format, ImmutableSet<TypeName> types, ImmutableList<Object> args) {
        this.format = format;
        this.types = types;
        this.args = args;
    }

    public String format() {
        return format;
    }

    public ImmutableList<Object> args() {
        return args;
    }

    public ImmutableSet<TypeName> types() {
        return types;
    }

    @Override
    public String toString() {
        return Writables.writeToString(this);
    }

    @Override
    public Set<ClassName> referencedClasses() {
        return FluentIterable.from(types).transformAndConcat(new Function<TypeName, Set<ClassName>>() {
            @Override
            public Set<ClassName> apply(TypeName input) {
                return input.referencedClasses();
            }
        }).toSet();
    }

    @Override
    public Appendable write(Appendable appendable, Context context) throws IOException {
        ImmutableList.Builder<Object> formattedArgsBuilder = ImmutableList.builder();
        for (Object arg : args) {
            if (arg instanceof Writable) {
                formattedArgsBuilder.add(((Writable) arg).write(new StringBuilder(), context).toString());
            } else {
                formattedArgsBuilder.add(arg);
            }
        }

        @SuppressWarnings("resource") // intentionally don't close the formatter
        Formatter formatter = new Formatter(appendable);
        formatter.format(format, formattedArgsBuilder.build().toArray(new Object[0]));

        return appendable;
    }

    public static Snippet format(String format, Object... args) {
        ImmutableSet.Builder<TypeName> types = ImmutableSet.builder();
        for (Object arg : args) {
            if (arg instanceof Snippet) {
                types.addAll(((Snippet) arg).types);
            }
            if (arg instanceof TypeName) {
                types.add((TypeName) arg);
            }
            if (arg instanceof HasTypeName) {
                types.add(((HasTypeName) arg).name());
            }
        }
        return new Snippet(format, types.build(), ImmutableList.copyOf(args));
    }

    public static Snippet format(String format, Iterable<? extends Object> args) {
        return format(format, Iterables.toArray(args, Object.class));
    }

    public static Snippet memberSelectSnippet(Iterable<? extends Object> selectors) {
        return format(Joiner.on('.').join(Collections.nCopies(Iterables.size(selectors), "%s")), selectors);
    }

    public static Snippet makeParametersSnippet(Iterable<Snippet> parameterSnippets) {
        Iterator<Snippet> iterator = parameterSnippets.iterator();
        StringBuilder stringBuilder = new StringBuilder();
        ImmutableSet.Builder<TypeName> typesBuilder = ImmutableSet.builder();
        ImmutableList.Builder<Object> argsBuilder = ImmutableList.builder();
        if (iterator.hasNext()) {
            Snippet firstSnippet = iterator.next();
            stringBuilder.append(firstSnippet.format());
            typesBuilder.addAll(firstSnippet.types());
            argsBuilder.addAll(firstSnippet.args());
        }
        while (iterator.hasNext()) {
            Snippet nextSnippet = iterator.next();
            stringBuilder.append(", ").append(nextSnippet.format());
            typesBuilder.addAll(nextSnippet.types());
            argsBuilder.addAll(nextSnippet.args());
        }
        return new Snippet(stringBuilder.toString(), typesBuilder.build(), argsBuilder.build());
    }
}