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Celerio Core Generation Engine
/*
* Copyright 2015 JAXIO http://www.jaxio.com
*
* 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 com.jaxio.celerio.model.support.jpa;
import com.jaxio.celerio.configuration.database.Table;
import com.jaxio.celerio.configuration.entity.CacheConfig;
import com.jaxio.celerio.configuration.entity.CacheConfigGetter;
import com.jaxio.celerio.configuration.entity.ColumnConfig;
import com.jaxio.celerio.model.Attribute;
import com.jaxio.celerio.model.Unique;
import com.jaxio.celerio.model.unique.CompositeUnique;
import com.jaxio.celerio.spi.support.AbstractEntitySpi;
import com.jaxio.celerio.util.AnnotationBuilder;
import com.jaxio.celerio.util.AttributeBuilder;
import org.apache.commons.lang.StringUtils;
import org.springframework.util.Assert;
import java.util.List;
import java.util.Set;
import static com.google.common.collect.Lists.newArrayList;
import static com.google.common.collect.Sets.newHashSet;
import static com.jaxio.celerio.configuration.database.support.SqlUtil.escapeSql;
import static javax.persistence.InheritanceType.JOINED;
import static javax.persistence.InheritanceType.SINGLE_TABLE;
import static org.apache.commons.lang.StringUtils.isNotBlank;
/**
* Helper to write non trivial JPA annotations that may be applied to the generated entity class.
* An annotation is considered non trivial when generating it would require an unreasonable
* amount of velocity code in the template.
*/
public class JpaEntity extends AbstractEntitySpi {
@Override
public String velocityVar() {
return "jpa";
}
@Override
public Object getTarget() {
return this;
}
public List getAnnotations() {
AnnotationBuilder ab = new AnnotationBuilder();
ab.add(getEntityAnnotation());
ab.add(getHibernateCacheAnnotation()); // TODO: move to cache entity spi ?
ab.add(getTableAnnotation());
ab.add(getInheritanceAnnotations());
ab.add(getDiscriminatorColumnAnnotation());
ab.add(getDiscriminatorValueAnnotation());
ab.add(getSecondaryTableAnnotations());
ab.add(getPrimaryKeyJoinColumnAnnotation());
ab.add(getAttributeOverrideAnnotation());
return ab.getAnnotations();
}
public String getAttributeOverrideAnnotation() {
if (entity.isRoot() || !entity.hasParent() || !entity.getParent().is(JOINED)) {
return "";
}
List attributesOverrides = newArrayList();
AttributeBuilder attributeBuilder = new AttributeBuilder();
for (Attribute attribute : entity.getAttributes().getList()) {
for (Attribute upAttribute : entity.getAttributes().getFlatAbove().getList()) {
if (attribute.getColumnName().equalsIgnoreCase(upAttribute.getColumnName())) {
addImport("javax.persistence.AttributeOverride");
String attributeOverride = "@AttributeOverride(name = \"" + attribute.getVar() + "\", column = @Column(name=\""
+ attribute.getColumnNameEscaped() + "\"))";
attributesOverrides.add(attributeOverride);
attributeBuilder.add(attributeOverride);
}
}
}
if (attributesOverrides.size() == 0) {
return "";
} else if (attributesOverrides.size() == 1) {
return appendComment(attributesOverrides.iterator().next());
} else {
addImport("javax.persistence.AttributeOverrides");
return appendComment("@AttributeOverrides({" + attributeBuilder.getAttributes() + "})");
}
}
public String getPrimaryKeyJoinColumnAnnotation() {
if (entity.isRoot() || !entity.hasInheritance() || !entity.getParent().is(JOINED)) {
return "";
}
Table rootTable = entity.getConfig().getMetadata().getTableByName(entity.getRoot().getTableName());
Table entityTable = entity.getConfig().getMetadata().getTableByName(entity.getTableName());
Assert.isTrue(rootTable.getPrimaryKeys().size() == 1, "Composite PK are not supported with JOIN inheritance strategy");
Assert.isTrue(entityTable.getPrimaryKeys().size() == 1, "Composite PK are not supported with JOIN inheritance strategy");
String rootPkColumnName = rootTable.getPrimaryKeys().iterator().next();
String entityPkColumnName = entityTable.getPrimaryKeys().iterator().next();
if (!entityPkColumnName.equalsIgnoreCase(rootPkColumnName)) {
return appendComment(getPrimaryKeyJoinColumnAnnotation(entityPkColumnName));
}
return "";
}
public String getSecondaryTableAnnotations() {
Set secondaryTables = getSecondaryTables();
if (secondaryTables.size() == 0) {
return "";
} else if (secondaryTables.size() == 1) {
return appendComment(getSecondaryTableAnnotation(secondaryTables.iterator().next().getName()));
} else {
addImport("javax.persistence.SecondaryTables");
StringBuilder sb = new StringBuilder("@SecondaryTables({");
boolean first = true;
for (Table secondaryTable : secondaryTables) {
if (first) {
first = false;
} else {
sb.append(", ");
}
sb.append(getSecondaryTableAnnotation(secondaryTable.getName()));
}
sb.append("})");
return appendComment(sb.toString());
}
}
public String getDiscriminatorValueAnnotation() {
if (!(entity.hasInheritance() && entity.getInheritance().hasDiscriminatorValue() && entity.is(SINGLE_TABLE))) {
return "";
}
addImport("javax.persistence.DiscriminatorValue");
return appendComment("@DiscriminatorValue(\"" + entity.getInheritance().getDiscriminatorValue() + "\")");
}
public String getInheritanceAnnotations() {
if (!(entity.hasInheritance() && entity.isRoot())) {
return "";
}
addImport("javax.persistence.Inheritance");
if (entity.is(SINGLE_TABLE)) {
return appendComment("@Inheritance");
} else {
addImport("javax.persistence.InheritanceType");
return appendComment("@Inheritance(strategy = InheritanceType." + entity.getInheritance().getStrategy() + ")");
}
}
public String getDiscriminatorColumnAnnotation() {
if (!(entity.hasInheritance() && entity.isRoot())) {
return "";
}
if (entity.getInheritance().hasDiscriminatorColumn()) {
addImport("javax.persistence.DiscriminatorColumn");
return appendComment("@DiscriminatorColumn(name = \"" + entity.getInheritance().getDiscriminatorColumn() + "\")");
}
return "";
}
private Set getSecondaryTables() {
Set result = newHashSet();
for (ColumnConfig cc : entity.getEntityConfig().getColumnConfigs()) {
// skip ignored attributes
if (cc.hasTrueIgnore()) {
continue;
}
// skip same table
if (entity.getTableName().equalsIgnoreCase(cc.getTableName())) {
continue;
}
// keep different ones
Table secondaryTable = entity.getConfig().getMetadata().getTableByName(cc.getTableName());
result.add(secondaryTable);
}
return result;
}
private String getSecondaryTableAnnotation(String secondaryTableName) {
Table table = entity.getConfig().getMetadata().getTableByName(entity.getTableName());
Table secondaryTable = entity.getConfig().getMetadata().getTableByName(secondaryTableName);
Assert.isTrue(table.getPrimaryKeys().size() == 1, "The table '" + table.getName() + "' is expected to have a one-column primary key. "
+ "It has instead " + table.getPrimaryKeys().size());
Assert.isTrue(secondaryTable.getPrimaryKeys().size() == 1, "The secondary table '" + secondaryTable.getName()
+ "' is expected to have a one-column primary key. " + "It has instead " + secondaryTable.getPrimaryKeys().size());
String pkColumnName = table.getPrimaryKeys().iterator().next();
String secondaryPkColumnName = secondaryTable.getPrimaryKeys().iterator().next();
addImport("javax.persistence.SecondaryTable");
if (pkColumnName.equalsIgnoreCase(secondaryPkColumnName)) {
return "@SecondaryTable(name = \"" + secondaryTable.getNameEscaped() + "\")";
} else {
return "@SecondaryTable(name = \"" + secondaryTable.getNameEscaped() + "\", " + "pkJoinColumns = "
+ getPrimaryKeyJoinColumnAnnotation(secondaryPkColumnName) + ")";
}
}
private String getPrimaryKeyJoinColumnAnnotation(String pkColumnName) {
addImport("javax.persistence.PrimaryKeyJoinColumn");
return "@PrimaryKeyJoinColumn(name = \"" + escapeSql(pkColumnName) + "\")";
}
public String getSelectAllNamedQuery() {
return entity.getModel().getType() + ".selectAll";
}
public String getSelectAllNativeNamedQuery() {
return entity.getModel().getType() + ".selectAll.native";
}
public String getHibernateCacheAnnotation() {
if (!entity.isRoot()) {
return "";
}
String cacheAnnotation = JpaConfigHelper.getCacheAnnotation(this, //
entity.getEntityConfig(), //
new CacheConfigGetter() {
@Override
public CacheConfig getCacheConfig() {
return entity.getConfig().getCelerio().getConfiguration().getDefaultEntityCacheConfig();
}
});
return appendComment(cacheAnnotation);
}
public String getEntityAnnotation() {
addImport("javax.persistence.Entity");
return appendComment("@Entity");
}
public String getTableAnnotation() {
if (entity.isRoot() || (entity.hasInheritance() && entity.getParent().is(JOINED))) {
StringBuffer annotation = new StringBuffer("");
appendAttribute(annotation, getName());
appendAttribute(annotation, getUniqueConstraints());
addImport("javax.persistence.Table");
return appendComment("@Table(" + annotation + ")");
}
return "";
}
private String getName() {
return "name = \"" + escapeSql(entity.getTableName()) + "\"";
}
private String getUniqueConstraints() {
List constraints = getTableUniqueConstraints();
if (constraints.isEmpty()) {
return "";
} else {
String constraintsAsString = "uniqueConstraints = {";
boolean first = true;
for (String constraint : constraints) {
if (!first) {
constraintsAsString += ", ";
} else {
first = false;
}
constraintsAsString += constraint;
}
constraintsAsString += "}";
return constraintsAsString;
}
}
private List getTableUniqueConstraints() {
List result = newArrayList();
for (Unique unique : entity.getCompositeUniques().getList()) {
result.add(buildConstraint((CompositeUnique) unique));
}
return result;
}
private String buildConstraint(CompositeUnique compositeUnique) {
addImport("javax.persistence.UniqueConstraint");
String ret = "@UniqueConstraint(";
if (StringUtils.isNotBlank(compositeUnique.getName())) {
ret += "name=\"" + compositeUnique.getName() + "\", ";
}
ret += "columnNames = {";
boolean first = true;
for (Attribute uniqueAttribute : compositeUnique.getAttributes()) {
if (!first) {
ret += ", ";
} else {
first = false;
}
ret += "\"" + escapeSql(uniqueAttribute.getColumnName()) + "\"";
}
ret += "})";
return ret;
}
private void appendAttribute(StringBuffer ret, String attribute) {
if (isNotBlank(attribute)) {
if (ret.length() > 0) {
ret.append(", ");
}
ret.append(attribute);
}
}
}
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