org.modeshape.jcr.query.parse.ColumnExpression Maven / Gradle / Ivy
/*
* ModeShape (http://www.modeshape.org)
*
* 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 org.modeshape.jcr.query.parse;
import org.infinispan.schematic.internal.HashCode;
import org.modeshape.common.annotation.Immutable;
import org.modeshape.common.text.Position;
import org.modeshape.common.util.CheckArg;
import org.modeshape.common.util.ObjectUtil;
import org.modeshape.jcr.query.model.SelectorName;
/**
* A representation of a column as expressed in the SQL query. Note that the selector name may not have been explicitly specified.
*/
@Immutable
class ColumnExpression {
private final SelectorName selectorName;
private final String propertyName;
private final String columnName;
private final Position position;
/**
* A column with the given name representing the named property on the node identified by the selector.
*
* @param selectorName the selector name; may be null if no selector was explicitly used in the query
* @param propertyName the name of the property
* @param columnName the name of the column
* @param position the position of the column in the query
*/
ColumnExpression( SelectorName selectorName,
String propertyName,
String columnName,
Position position ) {
CheckArg.isNotNull(propertyName, "propertyName");
CheckArg.isNotNull(columnName, "columnName");
CheckArg.isNotNull(position, "position");
this.selectorName = selectorName;
this.propertyName = propertyName;
this.columnName = columnName;
this.position = position;
}
/**
* Get the column's position in the query.
*
* @return the column's position; never null
*/
public Position getPosition() {
return position;
}
/**
* @return the name of the selector; may be null if no selector was explicitly used in the query
*/
public final SelectorName getSelectorName() {
return selectorName;
}
/**
* Get the name of the property.
*
* @return the property name; never null
*/
public final String getPropertyName() {
return propertyName;
}
/**
* Get the name of the column.
*
* @return the column name; never null
*/
public final String getColumnName() {
return columnName;
}
@Override
public int hashCode() {
return HashCode.compute(this.selectorName, this.propertyName, this.columnName);
}
@Override
public boolean equals( Object obj ) {
if (obj == this) return true;
if (obj instanceof ColumnExpression) {
ColumnExpression that = (ColumnExpression)obj;
if (!ObjectUtil.isEqualWithNulls(this.selectorName, that.selectorName)) return false;
if (!ObjectUtil.isEqualWithNulls(this.propertyName, that.propertyName)) return false;
if (!ObjectUtil.isEqualWithNulls(this.columnName, that.columnName)) return false;
return true;
}
return false;
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
if (selectorName != null) {
sb.append(selectorName.name());
sb.append('.');
}
sb.append(propertyName);
if (columnName != null) {
sb.append(" AS ").append(columnName);
}
return sb.toString();
}
}
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