MsgBuilderImpl.java

/*
 * SPDX-FileCopyrightText: 2025 kaumei.io
 * SPDX-License-Identifier: Apache-2.0
 */
package io.kaumei.jdbc.anno.msg;

import org.jspecify.annotations.Nullable;

import java.util.TreeSet;
import java.util.function.Supplier;

final class MsgBuilderImpl implements Msg.Builder {

    private final TreeSet<Msg.Message> messages = new TreeSet<>();

    MsgBuilderImpl() {
    }

    @Override
    public String toString() {
        return build().toString();
    }

    // interface Msg.Builder --------------------------------------------------

    @Override
    public boolean hasMessages() {
        return !messages.isEmpty();
    }

    @Override
    public boolean hasNoMessages() {
        return messages.isEmpty();
    }

    @Override
    public String join(String sep) {
        var sb = new StringBuilder();
        for (Msg.Message message : messages) {
            if (!sb.isEmpty()) {
                sb.append(sep);
            }
            sb.append(message.text());
        }
        return sb.toString();
    }

    @Override
    public void requireEmpty() {
        if (!messages.isEmpty()) {
            throw new IllegalStateException("List not empty: " + join(", "));
        }
    }

    @Override
    public Msg.Messages build() {
        return messages.isEmpty() ? Msg.empty() : new MessagesImpl(messages);
    }

    @Override
    public <T> Msg.Result<T> build(T value) {
        return build().build(value);
    }

    @Override
    public <T> Msg.Result<T> build(Supplier<T> func) {
        return build().build(func);
    }

    @Override
    public <T> Msg.NullableResult<T> buildOpt(@Nullable T value) {
        return build().buildOpt(value);
    }

    @Override
    public Msg.Builder add(Msg.Message msg) {
        messages.add(msg);
        return this;
    }

    @Override
    public Msg.Builder add(boolean test, Msg.Message msg) {
        if (test) {
            messages.add(msg);
        }
        return this;
    }

    @Override
    public Msg.Builder add(Supplier<Boolean> test, Msg.Message msg) {
        if (test.get()) {
            messages.add(msg);
        }
        return this;
    }

    @Override
    public Msg.Builder add(Msg.Messages msg) {
        for (var m : msg) {
            messages.add(m);
        }
        return this;
    }

    @Override
    public Msg.Builder add(Msg.@Nullable HasMessages value) {
        if (value != null && value.hasMessages()) {
            add(value.messages());
        }
        return this;
    }
}