net.java.ao.schema.ddl.DDLAction Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of activeobjects Show documentation
This is the full Active Objects library, if you don't know which one to use, you probably want this one.
There is a newer version: 6.1.1
/*
 * Copyright 2007 Daniel Spiewak
 * 
 * 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 net.java.ao.schema.ddl;

import java.util.Arrays;

/**
 * Database-agnostic representation of any supported DDL action
 * (usually one or two statements).  The idea behind this class
 * is to allow ActiveObjects to internally represent actions to
 * be taken on a database schema without coupling to a
 * database-specific rendering of the action.
 *
 * As this class is meant to be a generic container of different
 * action types, some fields may not be relevant to certain action
 * types, and thus these fields will contain null
 * values.  For example, the equivalent of an ALTER TABLE DROP FIELD
 * action will return null for {@link #getIndex()}.
 * However, code should not depend on this behavior; instead testing
 * the action type and only retrieving relevant data.
 *
 * @author Daniel Spiewak
 */
public class DDLAction {
    private DDLActionType actionType;

    private DDLTable table;
    private DDLField oldField, field;
    private DDLForeignKey key;
    private DDLIndex index;
    private DDLValue[] values;

    public static DDLActionBuilder builder(DDLActionType actionType) {
        return new DDLActionBuilder(actionType);
    }

    public DDLAction(DDLActionType actionType) {
        this.actionType = actionType;
    }

    DDLAction(
            DDLActionType actionType,
            DDLTable table,
            DDLField oldField,
            DDLField field,
            DDLForeignKey key,
            DDLIndex index,
            DDLValue[] values
    ) {
        this.actionType = actionType;
        this.table = table;
        this.oldField = oldField;
        this.field = field;
        this.key = key;
        this.index = index;
        this.values = values;
    }

    public DDLTable getTable() {
        return table;
    }

    public void setTable(DDLTable table) {
        this.table = table;
    }

    public DDLField getField() {
        return field;
    }

    public void setField(DDLField field) {
        this.field = field;
    }

    public DDLForeignKey getKey() {
        return key;
    }

    public void setKey(DDLForeignKey key) {
        this.key = key;
    }

    public DDLActionType getActionType() {
        return actionType;
    }


    public DDLField getOldField() {
        return oldField;
    }

    public void setOldField(DDLField oldField) {
        this.oldField = oldField;
    }

    public DDLIndex getIndex() {
        return index;
    }

    public void setIndex(DDLIndex index) {
        this.index = index;
    }

    public DDLValue[] getValues() {
        return values;
    }

    public void setValues(DDLValue[] values) {
        this.values = values;
    }

    @Override
    public int hashCode() {
        int back = 0;

        if (actionType != null) {
            back += actionType.hashCode();
        }
        if (table != null) {
            back += table.hashCode();
        }
        if (oldField != null) {
            back += oldField.hashCode();
        }
        if (field != null) {
            back += field.hashCode();
        }
        if (key != null) {
            back += key.hashCode();
        }
        if (index != null) {
            back += index.hashCode();
        }
        if (values != null) {
            back += Arrays.hashCode(values);
        }
        back %= 2 << 15;

        return back;
    }

    @Override
    public boolean equals(Object obj) {
        if (obj instanceof DDLAction) {
            DDLAction action = (DDLAction) obj;
            if (action == this) {
                return true;
            }

            if ((action.getTable() == null || action.getTable().equals(table))
                    && (action.getActionType() == actionType)
                    && (action.getOldField() == null || action.getOldField().equals(oldField))
                    && (action.getField() == null || action.getField().equals(field))
                    && (action.getKey() == null || action.getKey().equals(key))
                    && (action.getIndex() == null || action.getIndex().equals(index))
                    && (action.getValues() == null || Arrays.equals(action.getValues(), values))) {
                return true;
            }

            return false;
        }

        return super.equals(obj);
    }
}