org.apache.jackrabbit.value.WeakReferenceValue Maven / Gradle / Ivy
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/*
* 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.value;
import javax.jcr.Node;
import javax.jcr.PropertyType;
import javax.jcr.RepositoryException;
import javax.jcr.UnsupportedRepositoryOperationException;
import javax.jcr.ValueFormatException;
import java.util.Calendar;
import java.util.UUID;
import java.math.BigDecimal;
/**
* A WeakReferenceValue provides an implementation
* of the Value interface representing a WEAKREFERENCE value
* (a UUID of an existing node).
*/
public class WeakReferenceValue extends BaseValue {
public static final int TYPE = PropertyType.WEAKREFERENCE;
private final String uuid;
/**
* Constructs a ReferenceValue object representing the UUID of
* an existing node.
*
* @param target the node to be referenced
* @throws IllegalArgumentException If target is nonreferenceable.
* @throws javax.jcr.RepositoryException If another error occurs.
*/
public WeakReferenceValue(Node target) throws RepositoryException {
super(TYPE);
try {
this.uuid = target.getUUID();
} catch (UnsupportedRepositoryOperationException ure) {
throw new IllegalArgumentException("target is nonreferenceable.");
}
}
/**
* Returns a new ReferenceValue initialized to the value
* represented by the specified String.
*
* The specified String must denote the UUID of an existing
* node.
*
* @param s the string to be parsed.
* @return a newly constructed ReferenceValue representing the
* the specified value.
* @throws javax.jcr.ValueFormatException If the String is not a valid
* not a valid UUID format.
*/
public static WeakReferenceValue valueOf(String s) throws ValueFormatException {
if (s != null) {
try {
UUID.fromString(s);
} catch (IllegalArgumentException iae) {
throw new ValueFormatException("not a valid UUID format: " + s);
}
return new WeakReferenceValue(s);
} else {
throw new ValueFormatException("not a valid UUID format: " + s);
}
}
/**
* Protected constructor creating a ReferenceValue object
* without validating the UUID format.
*
* @param uuid the UUID of the node to be referenced
* @see #valueOf
*/
protected WeakReferenceValue(String uuid) {
super(TYPE);
this.uuid = uuid;
}
/**
* Indicates whether some other object is "equal to" this one.
*
* The result is true if and only if the argument is not
* null and is a ReferenceValue object that
* represents the same value as this object.
*
* @param obj the reference object with which to compare.
* @return true if this object is the same as the obj
* argument; false otherwise.
*/
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj instanceof WeakReferenceValue) {
WeakReferenceValue other = (WeakReferenceValue) obj;
if (uuid == other.uuid) {
return true;
} else if (uuid != null && other.uuid != null) {
return uuid.equals(other.uuid);
}
}
return false;
}
/**
* Returns zero to satisfy the Object equals/hashCode contract.
* This class is mutable and not meant to be used as a hash key.
*
* @return always zero
* @see Object#hashCode()
*/
public int hashCode() {
return 0;
}
//------------------------------------------------------------< BaseValue >
/**
* {@inheritDoc}
*/
protected String getInternalString() throws ValueFormatException {
if (uuid != null) {
return uuid;
} else {
throw new ValueFormatException("empty value");
}
}
//----------------------------------------------------------------< Value >
/**
* {@inheritDoc}
*/
public Calendar getDate()
throws ValueFormatException, IllegalStateException,
RepositoryException {
throw new ValueFormatException("conversion to date failed: inconvertible types");
}
/**
* {@inheritDoc}
*/
public long getLong()
throws ValueFormatException, IllegalStateException,
RepositoryException {
throw new ValueFormatException("conversion to long failed: inconvertible types");
}
/**
* {@inheritDoc}
*/
public boolean getBoolean()
throws ValueFormatException, IllegalStateException,
RepositoryException {
throw new ValueFormatException("conversion to boolean failed: inconvertible types");
}
/**
* {@inheritDoc}
*/
public double getDouble()
throws ValueFormatException, IllegalStateException,
RepositoryException {
throw new ValueFormatException("conversion to double failed: inconvertible types");
}
/**
* {@inheritDoc}
*/
public BigDecimal getDecimal()
throws ValueFormatException, IllegalStateException,
RepositoryException {
throw new ValueFormatException("conversion to Decimal failed: inconvertible types");
}
}