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package liquibase.change;
import liquibase.change.core.LoadDataColumnConfig;
import liquibase.database.Database;
import liquibase.database.DatabaseFactory;
import liquibase.database.DatabaseList;
import liquibase.exception.UnexpectedLiquibaseException;
import liquibase.exception.ValidationErrors;
import liquibase.serializer.LiquibaseSerializable;
import liquibase.sqlgenerator.SqlGeneratorFactory;
import liquibase.statement.DatabaseFunction;
import liquibase.statement.SequenceNextValueFunction;
import liquibase.statement.SqlStatement;
import liquibase.util.StringUtils;
import liquibase.util.beans.PropertyUtils;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Method;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.math.BigInteger;
import java.util.*;
/**
* Static metadata about a {@link Change} parameter.
* Instances of this class are tracked within {@link ChangeMetaData} and are immutable.
*/
public class ChangeParameterMetaData {
public static final String COMPUTE = "COMPUTE";
private Change change;
private String parameterName;
private String description;
private Map exampleValues;
private String displayName;
private String dataType;
private Class dataTypeClass;
private Type[] dataTypeClassParameters = new Type[0];
private String since;
private Set requiredForDatabase;
private Set supportedDatabases;
private String mustEqualExisting;
private LiquibaseSerializable.SerializationType serializationType;
public ChangeParameterMetaData(Change change, String parameterName, String displayName, String description,
Map exampleValues, String since, Type dataType,
String[] requiredForDatabase, String[] supportedDatabases, String mustEqualExisting,
LiquibaseSerializable.SerializationType serializationType) {
if (parameterName == null) {
throw new UnexpectedLiquibaseException("Unexpected null parameterName");
}
if (parameterName.contains(" ")) {
throw new UnexpectedLiquibaseException("Unexpected space in parameterName");
}
if (displayName == null) {
throw new UnexpectedLiquibaseException("Unexpected null displayName");
}
if (dataType == null) {
throw new UnexpectedLiquibaseException("Unexpected null dataType");
}
this.change = change;
this.parameterName = parameterName;
this.displayName = displayName;
this.description = description;
this.exampleValues = exampleValues;
if (dataType instanceof Class) {
this.dataType = StringUtils.lowerCaseFirst(((Class) dataType).getSimpleName());
this.dataTypeClass = (Class) dataType;
} else if (dataType instanceof ParameterizedType) {
this.dataType = StringUtils.lowerCaseFirst(
((Class) ((ParameterizedType) dataType).getRawType()).getSimpleName() +
" of " +
StringUtils.lowerCaseFirst(
((Class) ((ParameterizedType) dataType).getActualTypeArguments()[0]).getSimpleName()
)
);
this.dataTypeClass = (Class) ((ParameterizedType) dataType).getRawType();
this.dataTypeClassParameters = ((ParameterizedType) dataType).getActualTypeArguments();
}
this.mustEqualExisting = mustEqualExisting;
this.serializationType = serializationType;
this.since = since;
this.supportedDatabases = Collections.unmodifiableSet(analyzeSupportedDatabases(supportedDatabases));
this.requiredForDatabase = Collections.unmodifiableSet(analyzeRequiredDatabases(requiredForDatabase));
}
protected Set analyzeSupportedDatabases(String[] supportedDatabases) {
if (supportedDatabases == null) {
supportedDatabases = new String[]{ChangeParameterMetaData.COMPUTE};
}
Set computedDatabases = new HashSet<>();
if ((supportedDatabases.length == 1) && StringUtils.join(supportedDatabases, ",").equals
(ChangeParameterMetaData.COMPUTE)) {
int validDatabases = 0;
for (Database database : DatabaseFactory.getInstance().getImplementedDatabases()) {
if ((database.getShortName() == null) || "unsupported".equals(database.getShortName())) {
continue;
}
if (!change.supports(database)) {
continue;
}
try {
if (!change.generateStatementsVolatile(database)) {
Change testChange = change.getClass().newInstance();
ValidationErrors originalErrors = getStatementErrors(testChange, database);
this.setValue(testChange, this.getExampleValue(database));
ValidationErrors finalErrors = getStatementErrors(testChange, database);
if (finalErrors.getUnsupportedErrorMessages().isEmpty() || (finalErrors
.getUnsupportedErrorMessages().size() == originalErrors.getUnsupportedErrorMessages()
.size())) {
computedDatabases.add(database.getShortName());
}
validDatabases++;
}
} catch (Exception ignore) {
// Do nothing
}
}
if (validDatabases == 0) {
return new HashSet<>(Arrays.asList("all"));
} else if (computedDatabases.size() == validDatabases) {
computedDatabases = new HashSet<>(Arrays.asList("all"));
}
computedDatabases.remove("none");
return computedDatabases;
} else {
return new HashSet<>(Arrays.asList(supportedDatabases));
}
}
protected Set analyzeRequiredDatabases(String[] requiredDatabases) {
if (requiredDatabases == null) {
requiredDatabases = new String[]{ChangeParameterMetaData.COMPUTE};
}
Set computedDatabases = new HashSet<>();
if ((requiredDatabases.length == 1) && StringUtils.join(requiredDatabases, ",").equals
(ChangeParameterMetaData.COMPUTE)) {
int validDatabases = 0;
for (Database database : DatabaseFactory.getInstance().getImplementedDatabases()) {
try {
if (!change.generateStatementsVolatile(database)) {
Change testChange = change.getClass().newInstance();
ValidationErrors originalErrors = getStatementErrors(testChange, database);
this.setValue(testChange, this.getExampleValue(database));
ValidationErrors finalErrors = getStatementErrors(testChange, database);
if (!originalErrors.getRequiredErrorMessages().isEmpty() && (finalErrors
.getRequiredErrorMessages().size() < originalErrors.getRequiredErrorMessages().size())
) {
computedDatabases.add(database.getShortName());
}
validDatabases++;
}
} catch (Exception ignore) {
// Do nothing
}
}
if (validDatabases == 0) {
return new HashSet<>();
} else if (computedDatabases.size() == validDatabases) {
computedDatabases = new HashSet<>(Arrays.asList("all"));
}
computedDatabases.remove("none");
} else {
computedDatabases = new HashSet<>(Arrays.asList(requiredDatabases));
}
computedDatabases.remove("none");
return computedDatabases;
}
private static ValidationErrors getStatementErrors(Change testChange, Database database) {
ValidationErrors errors = new ValidationErrors();
SqlStatement[] statements = testChange.generateStatements(database);
for (SqlStatement statement : statements) {
errors.addAll(SqlGeneratorFactory.getInstance().validate(statement, database));
}
return errors;
}
/**
* Programmatic Name of the parameter. Will not contain spaces so it can be used for XMl tag names etc.
* By convention, Change names should start be camel case starting with a lower case letter.
*/
public String getParameterName() {
return parameterName;
}
/**
* A more friendly name of the parameter.
*/
public String getDisplayName() {
return displayName;
}
public String getSince() {
return since;
}
/**
* Return the data type of value stored in this parameter. Used for documentation and integration purposes as well
* as validation.
*/
public String getDataType() {
return dataType;
}
public Class getDataTypeClass() {
return dataTypeClass;
}
public Type[] getDataTypeClassParameters() {
return dataTypeClassParameters;
}
/**
* Return the database types for which this parameter is required. The strings returned correspond to the values
* returned by {@link liquibase.database.Database#getShortName()}.
* If the parameter is required for all datatabases, this will return the string "all" as an element.
* If the parameter is required for no databases, this will return an empty set. Passing the string "none" to the
* constructor also results in an empty set.
* This method will never return a null value
*/
public Set getRequiredForDatabase() {
return requiredForDatabase;
}
public Set getSupportedDatabases() {
return supportedDatabases;
}
/**
* A convenience method for testing the value returned by {@link #getRequiredForDatabase()} against a given database.
* Returns true if the {@link Database#getShortName()} method is contained in the required databases or the
* required database list contains the string "all"
*/
public boolean isRequiredFor(Database database) {
return requiredForDatabase.contains("all") || requiredForDatabase.contains(database.getShortName());
}
public boolean supports(Database database) {
return supportedDatabases.contains("all") || supportedDatabases.contains(database.getShortName());
}
/**
* Returns the current value of this parameter for the given Change.
*/
public Object getCurrentValue(Change change) {
try {
for (PropertyDescriptor descriptor : PropertyUtils.getInstance().getDescriptors(change.getClass())) {
if (descriptor.getDisplayName().equals(this.parameterName)) {
Method readMethod = descriptor.getReadMethod();
if (readMethod == null) {
readMethod = change.getClass().getMethod(
"is" + StringUtils.upperCaseFirst(descriptor.getName())
);
}
return readMethod.invoke(change);
}
}
throw new RuntimeException("Could not find readMethod for " + this.parameterName);
} catch (Exception e) {
throw new UnexpectedLiquibaseException(e);
}
}
/**
* Sets the value of this parameter on the given change.
*/
public void setValue(Change change, Object value) {
if ((value instanceof String) && (!"string".equals(dataType))) {
try {
switch (dataType) {
case "bigInteger":
value = new BigInteger((String) value);
break;
case "databaseFunction":
value = new DatabaseFunction((String) value);
break;
default:
throw new UnexpectedLiquibaseException("Unknown data type: " + dataType);
}
} catch (Exception e) {
throw new UnexpectedLiquibaseException("Cannot convert string value '" + value + "' to " +
dataType + ": " + e.getMessage());
}
}
try {
for (PropertyDescriptor descriptor : PropertyUtils.getInstance().getDescriptors(change.getClass())) {
if (descriptor.getDisplayName().equals(this.parameterName)) {
Method writeMethod = descriptor.getWriteMethod();
if (writeMethod == null) {
throw new UnexpectedLiquibaseException("Could not find writeMethod for " + this.parameterName);
}
Class expectedWriteType = writeMethod.getParameterTypes()[0];
if ((value != null) && !expectedWriteType.isAssignableFrom(value.getClass())) {
if (expectedWriteType.equals(String.class)) {
value = value.toString();
} else {
throw new UnexpectedLiquibaseException(
"Could not convert " + value.getClass().getName() +
" to " +
expectedWriteType.getName()
);
}
}
writeMethod.invoke(change, value);
}
}
} catch (Exception e) {
throw new UnexpectedLiquibaseException("Error setting " + this.parameterName + " to " + value, e);
}
}
/**
* Returns a dot-delimited chain of {@link liquibase.structure.DatabaseObject} fields describing what existing
* value this parameter would need to be set if applying the Change to a particular DatabaseObject.
*
* For example, in an addColumn Change, the "name" parameter would return "column.name" because if you know of an
* existing Column object, the "name" parameter needs to be set to the column's name.
* In the addColumn's "tableName" parameter, this method would return "column.table.name".
*
* The values of the chain correspond to the {@link liquibase.structure.DatabaseObject#getObjectTypeName()} and
* {@link liquibase.structure.DatabaseObject#getAttributes()}
*
* This method is used by integrations that want to generate Change instances or configurations pre-filled with
* data required to apply to an existing database object.
*/
public String getMustEqualExisting() {
return mustEqualExisting;
}
/**
* Return the {@link liquibase.serializer.LiquibaseSerializable.SerializationType}
* to use when serializing this object.
*/
public liquibase.serializer.LiquibaseSerializable.SerializationType getSerializationType() {
return serializationType;
}
public Object getExampleValue(Database database) {
if (exampleValues != null) {
Object exampleValue = null;
for (Map.Entry entry: exampleValues.entrySet()) {
if ("all".equalsIgnoreCase(entry.getKey())) {
exampleValue = entry.getValue();
} else if (DatabaseList.definitionMatches(entry.getKey(), database, false)) {
return entry.getValue();
}
}
if (exampleValue != null) {
return exampleValue;
}
}
Map standardExamples = new HashMap<>();
standardExamples.put("tableName", "person");
standardExamples.put("schemaName", "public");
standardExamples.put("tableSchemaName", "public");
standardExamples.put("catalogName", "cat");
standardExamples.put("tableCatalogName", "cat");
standardExamples.put("columnName", "id");
standardExamples.put("columnNames", "id, name");
standardExamples.put("indexName", "idx_address");
standardExamples.put("columnDataType", "int");
standardExamples.put("dataType", "int");
standardExamples.put("sequenceName", "seq_id");
standardExamples.put("viewName", "v_person");
standardExamples.put("constraintName", "const_name");
standardExamples.put("primaryKey", "pk_id");
if (standardExamples.containsKey(parameterName)) {
return standardExamples.get(parameterName);
}
for (String prefix : new String[] {"base", "referenced", "new", "old"}) {
if (parameterName.startsWith(prefix)) {
String mainName = StringUtils.lowerCaseFirst(parameterName.replaceFirst("^"+prefix, ""));
if (standardExamples.containsKey(mainName)) {
return standardExamples.get(mainName);
}
}
}
switch (dataType) {
case "string":
return "A String";
case "integer":
return 3;
case "boolean":
return true;
case "bigInteger":
return new BigInteger("371717");
case "list":
return null; // TODO
case "sequenceNextValueFunction":
return new SequenceNextValueFunction("seq_name");
case "databaseFunction":
return new DatabaseFunction("now");
case "list of columnConfig": {
ArrayList list = new ArrayList<>();
list.add(new ColumnConfig().setName("id").setType("int"));
return list;
}
case "list of addColumnConfig": {
ArrayList list = new ArrayList<>();
list.add(new AddColumnConfig().setName("id").setType("int"));
return list;
}
case "list of loadDataColumnConfig": {
ArrayList list = new ArrayList<>();
list.add(new LoadDataColumnConfig().setName("id").setType("int"));
return list;
}
default:
throw new UnexpectedLiquibaseException("Unknown dataType " + dataType + " for " + getParameterName());
}
}
public String getDescription() {
if (description != null) {
return description;
}
Map standardDescriptions = new HashMap<>();
standardDescriptions.put("tableName", "Name of the table");
standardDescriptions.put("schemaName", "Name of the schema");
standardDescriptions.put("catalogName", "Name of the catalog");
standardDescriptions.put("columnName", "Name of the column");
return StringUtils.trimToEmpty(standardDescriptions.get(parameterName));
}
@Override
public String toString() {
return (change != null ? (change.toString() + ".") : "") + getParameterName();
}
}
