org.apache.jackrabbit.oak.plugins.memory.EmptyPropertyState Maven / Gradle / Ivy
/*
* 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.oak.plugins.memory;
import java.util.Collections;
import javax.annotation.Nonnull;
import org.apache.jackrabbit.oak.api.PropertyState;
import org.apache.jackrabbit.oak.api.Type;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
/**
* Abstract base class for {@link PropertyState} implementations
* providing default implementation which correspond to a property
* without any value.
*/
public abstract class EmptyPropertyState extends AbstractPropertyState {
private final String name;
/**
* Create a new property state with the given {@code name}
* @param name The name of the property state.
*/
protected EmptyPropertyState(@Nonnull String name) {
this.name = checkNotNull(name);
}
/**
* Create an empty {@code PropertyState}
* @param name The name of the property state
* @param type The type of the property state
* @return The new property state
*/
public static PropertyState emptyProperty(String name, final Type type) {
if (!type.isArray()) {
throw new IllegalArgumentException("Not an array type:" + type);
}
return new EmptyPropertyState(name) {
@Override
public Type getType() {
return type;
}
};
}
@Nonnull
@Override
public String getName() {
return name;
}
/**
* @return {@code true}
*/
@Override
public boolean isArray() {
return true;
}
/**
* @return An empty list if {@code type.isArray()} is {@code true}.
* @throws IllegalArgumentException {@code type.isArray()} is {@code false}.
*/
@SuppressWarnings("unchecked")
@Nonnull
@Override
public T getValue(Type type) {
checkArgument(type.isArray(), "Type must be an array type");
return (T) Collections.emptyList();
}
/**
* @throws IndexOutOfBoundsException always
*/
@Nonnull
@Override
public T getValue(Type type, int index) {
throw new IndexOutOfBoundsException(String.valueOf(index));
}
/**
* @throws IllegalStateException always
*/
@Override
public long size() {
throw new IllegalStateException("Not a single valued property");
}
/**
* @throws IndexOutOfBoundsException always
*/
@Override
public long size(int index) {
throw new IndexOutOfBoundsException(String.valueOf(index));
}
/**
* @return {@code 0}
*/
@Override
public int count() {
return 0;
}
}