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Liquibase is a tool for managing and executing database changes.
There is a newer version: 4.30.0
package liquibase.structure.core;

import liquibase.change.ColumnConfig;
import liquibase.change.ConstraintsConfig;
import liquibase.parser.core.ParsedNode;
import liquibase.parser.core.ParsedNodeException;
import liquibase.resource.ResourceAccessor;
import liquibase.serializer.AbstractLiquibaseSerializable;
import liquibase.structure.AbstractDatabaseObject;
import liquibase.structure.DatabaseObject;
import liquibase.util.BooleanUtil;
import liquibase.util.StringUtil;

import java.math.BigInteger;
import java.util.Arrays;
import java.util.List;
import java.util.Set;

public class Column extends AbstractDatabaseObject {

    private String name;
    private Boolean computed;
    private Boolean descending;
    private boolean forIndex;

    public Column() {
    }

    public Column(String columnName) {
        setName(columnName);
    }

    public Column(Class relationType, String catalogName, String schemaName, String tableName, String columnName) {
        if (Table.class.isAssignableFrom(relationType)) {
            this.setRelation(new Table(catalogName, schemaName, tableName));
        } else if (View.class.isAssignableFrom(relationType)) {
            this.setRelation(new View(catalogName, schemaName, tableName));
        }
        setName(columnName);
    }

    public Column(ColumnConfig columnConfig) {
        setName(columnConfig.getName());
        setDescending(columnConfig.getDescending());
        setType(new DataType(columnConfig.getType()));

        if (columnConfig.getDefaultValueObject() != null) {
            setDefaultValue(columnConfig.getDefaultValueObject());
        }

        if ((columnConfig.isAutoIncrement() != null) && columnConfig.isAutoIncrement()) {
            setAutoIncrementInformation(new AutoIncrementInformation(columnConfig.getStartWith(), columnConfig.getIncrementBy()));
        }

        ConstraintsConfig constraints = columnConfig.getConstraints();
        if (constraints != null) {
            setNullable(constraints.isNullable());
            setValidateNullable(constraints.getValidateNullable());
        }

        setRemarks(columnConfig.getRemarks());
    }

    public boolean isForIndex() {
        return forIndex;
    }

    public void setForIndex(boolean forIndex) {
        this.forIndex = forIndex;
    }

    public Relation getRelation() {
        return getAttribute("relation", Relation.class);
    }

    @Override
    public DatabaseObject[] getContainingObjects() {
        return new DatabaseObject[]{
                getRelation()
        };
    }

    public Column setRelation(Relation relation) {
        setAttribute("relation", relation);

        return this;
    }


    @Override
    public Schema getSchema() {
        Relation relation = getRelation();
        if (relation == null) {
            return null;
        }
        return relation.getSchema();
    }

    @Override
    public String getName() {
        return name;
    }

    @Override
    public Column setName(String name) {
        this.name = name;
        setAttribute("name", name);

        return this;
    }

    public Column setName(String name, boolean computed) {
        setName(name);
        setComputed(computed);

        return this;
    }



    public Boolean getComputed() {
        return computed;
    }

    public Column setComputed(Boolean computed) {
        this.computed = computed;
        setAttribute("computed", computed);

        return this;
    }

    public Boolean isNullable() {
        return getAttribute("nullable", Boolean.class);
    }

    public Column setNullable(Boolean nullable) {
        setAttribute("nullable", nullable);

        return this;
    }


    public DataType getType() {
        return getAttribute("type", DataType.class);
    }

    public Column setType(DataType type) {
        setAttribute("type", type);

        return this;
    }

    public Object getDefaultValue() {
        return getAttribute("defaultValue", Object.class);
    }

    public Column setDefaultValue(Object defaultValue) {
        setAttribute("defaultValue", defaultValue);

        return this;
    }


    public String getDefaultValueConstraintName() {
        return getAttribute("defaultValueConstraintName", String.class);
    }

    public Column setDefaultValueConstraintName(String defaultValueConstraintName) {
        setAttribute("defaultValueConstraintName", defaultValueConstraintName);

        return this;
    }


    public boolean isAutoIncrement() {
        return getAutoIncrementInformation() != null;
    }

    public AutoIncrementInformation getAutoIncrementInformation() {
        return getAttribute("autoIncrementInformation", AutoIncrementInformation.class);
    }

    public void setAutoIncrementInformation(AutoIncrementInformation autoIncrementInformation) {
        setAttribute("autoIncrementInformation", autoIncrementInformation);
    }

    public Boolean getDescending() {
        return descending;
    }

    public Column setDescending(Boolean descending) {
        this.descending = descending;
        setAttribute("descending", descending);

        return this;
    }

    /**
     * VALIDATE keyword defines whether a all constraints on a column in a table
     * should be checked if it refers to a valid row or not.
     * @return true if ENABLE VALIDATE (this is the default), or false if ENABLE NOVALIDATE.
     */
    public boolean getValidate() {
        return getAttribute("validate", true);
    }

    /**
     * @param validateNullable - if validateNullable is set to FALSE then the constraint will be created
     * with the 'ENABLE NOVALIDATE' mode. This means the constraint would be created, but that no
     * check will be done to ensure old data has valid not null constraint - only new data would be checked
     * to see if it complies with the constraint logic. The default state for not null constraint is to
     * have 'ENABLE VALIDATE' set.
     */
    public Column setValidateNullable(Boolean validateNullable) {
        this.setAttribute("validateNullable", validateNullable);
        return this;
    }

    /**
     * Returns {@code false} for Nor {@code null} constraints created with {@code ENABLE NOVALIDATE} mode, otherwise returns {@code true}.
     *
     * @return {@code true} if validation is required for nullable constraints, {@code false} otherwise
     */
    public boolean getValidateNullable() {
        return getAttribute("validateNullable", true);
    }

    public String toString(boolean includeRelation) {
        if (includeRelation) {
            return toString();
        } else {
            return getName() + (getDescending() != null && getDescending() ? " DESC" : "");
        }
    }

    @Override
    public String toString() {
        String columnOrder = getDescending() != null && getDescending() ? " DESC" : "";
        if (getRelation() == null) {
            return getName() + columnOrder;
        } else {
            String tableOrViewName = getRelation().getName();
            if ((getRelation().getSchema() != null) && (getRelation().getSchema().getName() != null)) {
                tableOrViewName = getRelation().getSchema().getName()+"."+tableOrViewName;
            }
            return tableOrViewName + "." + getName() + columnOrder;
        }
    }


    @Override
    public int compareTo(Object other) {
        Column o = (Column) other;
        try {
            //noinspection UnusedAssignment
            int returnValue = 0;
            if ((this.getRelation() != null) && (o.getRelation() == null)) {
                return 1;
            } else if ((this.getRelation() == null) && (o.getRelation() != null)) {
                return -1;
            } else if (this.getRelation() != null && o.getRelation() != null) {
                returnValue = this.getRelation().compareTo(o.getRelation());
                if ((returnValue == 0) && (this.getRelation().getSchema() != null) && (o.getRelation().getSchema() !=
                    null)) {
                    returnValue = this.getSchema().compareTo(o.getRelation().getSchema());
                }
            }

            if (returnValue == 0) {
                returnValue = this.toString().toUpperCase().compareTo(o.toString().toUpperCase());
            }

            return returnValue;
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }


    @Override
    public boolean equals(Object o) {
        try {
            if (this == o) return true;
            if ((o == null) || (getClass() != o.getClass())) return false;

            Column column = (Column) o;

            return this.compareTo(column) == 0;
        } catch (Exception e) {
            throw new RuntimeException(e);
        }

    }

    @Override
    public int hashCode() {
        return toString().toUpperCase().hashCode();
    }

    public boolean isDataTypeDifferent(Column otherColumn) {
        if (!this.isCertainDataType() || !otherColumn.isCertainDataType()) {
            return false;
        } else {
            return !this.getType().equals(otherColumn.getType());
        }
    }

    @SuppressWarnings({"SimplifiableIfStatement"})
    public boolean isNullabilityDifferent(Column otherColumn) {
        if ((this.isNullable() == null) && (otherColumn.isNullable() == null)) {
            return false;
        }
        if ((this.isNullable() == null) && (otherColumn.isNullable() != null)) {
            return true;
        }
        if ((this.isNullable() != null) && (otherColumn.isNullable() == null)) {
            return true;
        }
        return !this.isNullable().equals(otherColumn.isNullable());
    }

    public boolean isDifferent(Column otherColumn) {
        return isDataTypeDifferent(otherColumn) || isNullabilityDifferent(otherColumn);
    }


    public boolean isCertainDataType() {
        return getAttribute("certainDataType", Boolean.class);
    }

    public Column setCertainDataType(boolean certainDataType) {
        setAttribute("certainDataType", certainDataType);

        return this;
    }

    public String getRemarks() {
        return getAttribute("remarks", String.class);
    }

    public Column setRemarks(String remarks) {
        setAttribute("remarks", remarks);

        return this;
    }

    public static Column fromName(String columnName) {
        columnName = columnName.trim();
        Boolean descending = null;
        if (columnName.matches("(?i).*\\s+DESC")) {
            columnName = columnName.replaceFirst("(?i)\\s+DESC$", "");
            descending = true;
        } else if (columnName.matches("(?i).*\\s+ASC")) {
            columnName = columnName.replaceFirst("(?i)\\s+ASC$", "");
            descending = false;
        }
        return new Column(columnName)
                .setDescending(descending);
    }

    public Integer getOrder() {
        return getAttribute("order", Integer.class);
    }

    public Column setOrder(Integer order) {
        setAttribute("order", order);
        return this;
    }

    public static Column[] arrayFromNames(String columnNames) {
        if (columnNames == null) {
            return null;
        }

        List columnNameList = StringUtil.splitAndTrim(columnNames, ",");
        Column[] returnArray = new Column[columnNameList.size()];
        for (int i = 0; i < columnNameList.size(); i++) {
            returnArray[i] = fromName(columnNameList.get(i));
        }
        return returnArray;
    }

    public static List listFromNames(String columnNames) {
        if (columnNames == null) {
            return null;
        }
        return Arrays.asList(arrayFromNames(columnNames));
    }

    @Override
    public void load(ParsedNode parsedNode, ResourceAccessor resourceAccessor) throws ParsedNodeException {
        super.load(parsedNode, resourceAccessor);
        ParsedNode typeNode = parsedNode.getChild(null, "type");
        if (typeNode != null) {
            DataType type = new DataType();
            type.load(typeNode, resourceAccessor);
            setType(type);
        }
        ParsedNode autoIncrementInformation = parsedNode.getChild(null, "autoIncrementInformation");
        if (autoIncrementInformation != null) {
            AutoIncrementInformation info = new AutoIncrementInformation();
            info.load(autoIncrementInformation, resourceAccessor);
            setAutoIncrementInformation(info);
        }
    }

    public static class AutoIncrementInformation extends AbstractLiquibaseSerializable {
        private BigInteger startWith;
        private BigInteger incrementBy;
        private Boolean defaultOnNull;
        private String generationType;

        public AutoIncrementInformation() {
            this(1, 1);
        }

        public AutoIncrementInformation(Number startWith, Number incrementBy) {
            this.startWith = (startWith == null) ? null : BigInteger.valueOf(startWith.longValue());
            this.incrementBy = (incrementBy == null) ? null : BigInteger.valueOf(incrementBy.longValue());
        }

        public BigInteger getStartWith() {
            return startWith;
        }

        public BigInteger getIncrementBy() {
            return incrementBy;
        }

        public void setDefaultOnNull(Boolean defaultOnNull) {
            this.defaultOnNull = defaultOnNull;
        }

        public Boolean getDefaultOnNull() {
            return defaultOnNull;
        }

        public void setGenerationType(String generationType) {
            this.generationType = generationType;
        }

        public String getGenerationType() {
            return generationType;
        }

        @Override
        public String toString() {
            return String.format("GENERATED %s %sAUTO INCREMENT START WITH %d INCREMENT BY %d",
                    this.generationType, Boolean.TRUE.equals(this.defaultOnNull) ? "ON NULL " : "", startWith, incrementBy);
        }

        @Override
        public String getSerializedObjectName() {
            return "autoIncrementInformation";
        }

        @Override
        public String getSerializedObjectNamespace() {
            return STANDARD_CHANGELOG_NAMESPACE;
        }

        @Override
        public void load(ParsedNode parsedNode, ResourceAccessor resourceAccessor) throws ParsedNodeException {
            this.startWith = (BigInteger) convertEscaped(parsedNode.getChildValue(null, "startWith"));
            this.incrementBy = (BigInteger) convertEscaped(parsedNode.getChildValue(null, "incrementBy"));
            this.defaultOnNull = parsedNode.getChildValue(null, "defaultOnNull", Boolean.class);
            this.generationType = parsedNode.getChildValue(null, "generationType", String.class);
        }
    }

    @Override
    public Set getSerializableFields() {
        final Set fields = super.getSerializableFields();
        //if this is a computed or indexed column, don't have the serializer try to traverse down to the relation since it may not be a "real" object with an objectId
        if (BooleanUtil.isTrue(getDescending()) || BooleanUtil.isTrue(getComputed())) {
            fields.remove("relation");
        }
        fields.remove("forIndex");
        return fields;
    }
}