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Cayenne Object Persistence Framework
/*****************************************************************
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.cayenne.dataview;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.apache.commons.lang.Validate;
import org.apache.cayenne.map.ObjEntity;
/**
* A view rooted in an ObjEntity.
*
* @since 1.1
* @author Andriy Shapochka
*/
public class ObjEntityView {
private DataView owner;
private ObjEntity objEntity;
private List fields = new ArrayList();
private Map nameFieldMap = new HashMap();
private List readOnlyFields = Collections.unmodifiableList(fields);
private String name;
public ObjEntityView() {
}
public String getName() {
return name;
}
public void setName(String name) {
Validate.notNull(name);
this.name = name;
}
public List getFields() {
return readOnlyFields;
}
public List getVisibleFields() {
int size = getFieldCount();
List dst = new ArrayList(size);
for (int i = 0; i < size; i++) {
ObjEntityViewField field = getField(i);
if (field.isVisible())
dst.add(field);
}
return dst;
}
public List getEditableFields() {
int size = getFieldCount();
List dst = new ArrayList(size);
for (int i = 0; i < size; i++) {
ObjEntityViewField field = getField(i);
if (field.isVisible() && field.isEditable())
dst.add(field);
}
return dst;
}
public ObjEntity getObjEntity() {
return objEntity;
}
public void setObjEntity(ObjEntity objEntity) {
Validate.notNull(objEntity);
this.objEntity = objEntity;
}
public ObjEntityViewField getField(int index) {
return (ObjEntityViewField) fields.get(index);
}
public ObjEntityViewField getField(String fieldName) {
return (ObjEntityViewField) nameFieldMap.get(fieldName);
}
public ObjEntityViewField getFieldForObjAttribute(String objAttributeName) {
for (int i = 0; i < fields.size(); i++) {
ObjEntityViewField field = getField(i);
if (objAttributeName.equals(field.getObjAttribute().getName()))
return field;
}
return null;
}
public int getFieldCount() {
return fields.size();
}
public boolean hasFields() {
return !fields.isEmpty();
}
public void clearFields() {
for (int i = 0; i < getFieldCount(); i++) {
ObjEntityViewField field = getField(i);
field.setOwner(null);
field.setIndex(-1);
}
fields.clear();
nameFieldMap.clear();
}
public boolean removeField(ObjEntityViewField field) {
if (field.getOwner() != this)
return false;
field.setOwner(null);
field.setIndex(-1);
nameFieldMap.remove(field.getName());
return fields.remove(field);
}
public int insertField(ObjEntityViewField field) {
if (field.getOwner() == this)
return field.getIndex();
Validate.notNull(field.getName());
Validate.isTrue(!nameFieldMap.containsKey(field.getName()));
field.setOwner(this);
nameFieldMap.put(field.getName(), field);
int prefIndex = field.getPreferredIndex();
int fieldCount = getFieldCount();
if (prefIndex < 0) {
int newIndex = fieldCount;
fields.add(field);
field.setIndex(newIndex);
return newIndex;
}
int index = 0;
int curPrefIndex = -1;
while (index < fieldCount
&& ((curPrefIndex = getField(index++).getPreferredIndex()) <= prefIndex)
&& curPrefIndex >= 0) {
// skip forward
}
fields.add(index, field);
field.setIndex(index);
fieldCount++;
for (int i = (index + 1); i < fieldCount; i++) {
getField(i).setIndex(i);
}
return index;
}
public DataView getOwner() {
return owner;
}
void setOwner(DataView owner) {
this.owner = owner;
}
}
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