Extract abstract post reply builder class.

[Sone.git] / src / main / java / net / pterodactylus / sone / data / impl / AbstractPostReplyBuilder.java

diff --git a/src/main/java/net/pterodactylus/sone/data/impl/AbstractPostReplyBuilder.java b/src/main/java/net/pterodactylus/sone/data/impl/AbstractPostReplyBuilder.java
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+++ b/src/main/java/net/pterodactylus/sone/data/impl/AbstractPostReplyBuilder.java
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+/*
+ * Sone - AbstractPostReplyBuilder.java - Copyright © 2013 David Roden
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package net.pterodactylus.sone.data.impl;
+
+import static com.google.common.base.Preconditions.checkState;
+
+import org.apache.commons.lang.StringUtils;
+
+import net.pterodactylus.sone.database.PostReplyBuilder;
+
+/**
+ * Abstract {@link PostReplyBuilder} implementation. It stores the state of the
+ * new post and performs validation, implementations only need to implement
+ * {@link #build()}.
+ *
+ * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
+ */
+public abstract class AbstractPostReplyBuilder extends AbstractReplyBuilder<PostReplyBuilder> implements PostReplyBuilder {
+
+       /** The ID of the post the created reply refers to. */
+       protected String postId;
+
+       /**
+        * {@inheritDoc}
+        */
+       @Override
+       public PostReplyBuilder to(String postId) {
+               this.postId = postId;
+               return this;
+       }
+
+       //
+       // PROTECTED METHODS
+       //
+
+       /**
+        * Validates the state of this post reply builder.
+        *
+        * @throws IllegalStateException
+        *             if the state is not valid for building a new post reply
+        */
+       protected void validate() throws IllegalStateException {
+               checkState((randomId && (id == null)) || (!randomId && (id != null)), "either random ID nor custom ID must be set");
+               checkState(senderId != null, "sender must not be null");
+               checkState((currentTime && (time == 0)) || (!currentTime && (time >= 0)), "either current time or custom time must be set");
+               checkState(!StringUtils.isBlank(text), "text must not be empty");
+               checkState(postId != null, "post must not be null");
+       }
+
+}