/*
* 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.jackrabbit.core.state;
import org.apache.jackrabbit.spi.Name;
import org.apache.jackrabbit.core.id.NodeId;
/**
* <code>ChildNodeEntry</code> specifies the name, index (in the case of
* same-name siblings) and the UUID of a child node entry.
* <p>
* <code>ChildNodeEntry</code> instances are immutable.
*/
public final class ChildNodeEntry {
private int hash;
private final Name name;
private final int index; // 1-based index for same-name siblings
private final NodeId id;
ChildNodeEntry(Name name, NodeId id, int index) {
if (name == null) {
throw new IllegalArgumentException("name can not be null");
}
this.name = name;
if (id == null) {
throw new IllegalArgumentException("id can not be null");
}
this.id = id;
if (index < 1) {
throw new IllegalArgumentException("index is 1-based");
}
this.index = index;
}
public NodeId getId() {
return id;
}
public Name getName() {
return name;
}
public int getIndex() {
return index;
}
//---------------------------------------< java.lang.Object overrides >
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj instanceof ChildNodeEntry) {
ChildNodeEntry other = (ChildNodeEntry) obj;
return (name.equals(other.name) && id.equals(other.id)
&& index == other.index);
}
return false;
}
public String toString() {
return name.toString() + "[" + index + "] -> " + id;
}
public int hashCode() {
// ChildNodeEntry is immutable, we can store the computed hash code value
int h = hash;
if (h == 0) {
h = 17;
h = 37 * h + name.hashCode();
h = 37 * h + id.hashCode();
h = 37 * h + index;
hash = h;
}
return h;
}
}