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The UnboundID LDAP SDK for Java is a fast, comprehensive, and easy-to-use
Java API for communicating with LDAP directory servers and performing
related tasks like reading and writing LDIF, encoding and decoding data
using base64 and ASN.1 BER, and performing secure communication. This
package contains the Standard Edition of the LDAP SDK, which is a
complete, general-purpose library for communicating with LDAPv3 directory
servers.
/*
* Copyright 2009-2018 Ping Identity Corporation
* All Rights Reserved.
*/
/*
* Copyright (C) 2009-2018 Ping Identity Corporation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License (GPLv2 only)
* or the terms of the GNU Lesser General Public License (LGPLv2.1 only)
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see .
*/
package com.unboundid.ldap.sdk.persist;
import java.io.Serializable;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Type;
import com.unboundid.ldap.sdk.Attribute;
import com.unboundid.ldap.sdk.schema.AttributeTypeDefinition;
import com.unboundid.util.Debug;
import com.unboundid.util.Extensible;
import com.unboundid.util.StaticUtils;
import com.unboundid.util.ThreadSafety;
import com.unboundid.util.ThreadSafetyLevel;
import static com.unboundid.ldap.sdk.persist.PersistMessages.*;
/**
* This class provides an API for converting between Java objects and LDAP
* attributes. Concrete instances of this class must provide a default
* zero-argument constructor.
*/
@Extensible()
@ThreadSafety(level=ThreadSafetyLevel.INTERFACE_THREADSAFE)
public abstract class ObjectEncoder
implements Serializable
{
/**
* The serial version UID for this serializable class.
*/
private static final long serialVersionUID = -5139516629886911696L;
/**
* Indicates whether this object encoder may be used to encode or decode
* objects of the specified type.
*
* @param t The type of object for which to make the determination.
*
* @return {@code true} if this object encoder may be used for objects of
* the specified type, or {@code false} if not.
*/
public abstract boolean supportsType(Type t);
/**
* Constructs a definition for an LDAP attribute type which may be added to
* the directory server schema to allow it to hold the value of the specified
* field. Note that the object identifier used for the constructed attribute
* type definition is not required to be valid or unique.
*
* @param f The field for which to construct an LDAP attribute type
* definition. It will include the {@link LDAPField} annotation
* type.
*
* @return The constructed attribute type definition.
*
* @throws LDAPPersistException If this object encoder does not support
* encoding values for the associated field
* type.
*/
public final AttributeTypeDefinition constructAttributeType(final Field f)
throws LDAPPersistException
{
return constructAttributeType(f, DefaultOIDAllocator.getInstance());
}
/**
* Constructs a definition for an LDAP attribute type which may be added to
* the directory server schema to allow it to hold the value of the specified
* field.
*
* @param f The field for which to construct an LDAP attribute type
* definition. It will include the {@link LDAPField} annotation
* type.
* @param a The OID allocator to use to generate the object identifier. It
* must not be {@code null}.
*
* @return The constructed attribute type definition.
*
* @throws LDAPPersistException If this object encoder does not support
* encoding values for the associated field
* type.
*/
public abstract AttributeTypeDefinition constructAttributeType(Field f,
OIDAllocator a)
throws LDAPPersistException;
/**
* Constructs a definition for an LDAP attribute type which may be added to
* the directory server schema to allow it to hold the value returned by the
* specified method. Note that the object identifier used for the constructed
* attribute type definition is not required to be valid or unique.
*
* @param m The method for which to construct an LDAP attribute type
* definition. It will include the {@link LDAPGetter}
* annotation type.
*
* @return The constructed attribute type definition.
*
* @throws LDAPPersistException If this object encoder does not support
* encoding values for the associated method
* type.
*/
public final AttributeTypeDefinition constructAttributeType(final Method m)
throws LDAPPersistException
{
return constructAttributeType(m, DefaultOIDAllocator.getInstance());
}
/**
* Constructs a definition for an LDAP attribute type which may be added to
* the directory server schema to allow it to hold the value returned by the
* specified method. Note that the object identifier used for the constructed
* attribute type definition is not required to be valid or unique.
*
* @param m The method for which to construct an LDAP attribute type
* definition. It will include the {@link LDAPGetter}
* annotation type.
* @param a The OID allocator to use to generate the object identifier. It
* must not be {@code null}.
*
* @return The constructed attribute type definition.
*
* @throws LDAPPersistException If this object encoder does not support
* encoding values for the associated method
* type.
*/
public abstract AttributeTypeDefinition constructAttributeType(Method m,
OIDAllocator a)
throws LDAPPersistException;
/**
* Indicates whether the provided field can hold multiple values.
*
* @param field The field for which to make the determination. It must be
* marked with the {@link LDAPField} annotation.
*
* @return {@code true} if the provided field can hold multiple values, or
* {@code false} if not.
*/
public abstract boolean supportsMultipleValues(Field field);
/**
* Indicates whether the provided setter method takes an argument that can
* hold multiple values.
*
* @param method The setter method for which to make the determination. It
* must be marked with the {@link LDAPSetter} annotation
* type and conform to the constraints associated with that
* annotation.
*
* @return {@code true} if the provided method takes an argument that can
* hold multiple values, or {@code false} if not.
*/
public abstract boolean supportsMultipleValues(Method method);
/**
* Encodes the provided field to an LDAP attribute.
*
* @param field The field to be encoded.
* @param value The value for the field in the object to be encoded.
* @param name The name to use for the constructed attribute.
*
* @return The attribute containing the encoded representation of the
* provided field.
*
* @throws LDAPPersistException If a problem occurs while attempting to
* construct an attribute for the field.
*/
public abstract Attribute encodeFieldValue(Field field, Object value,
String name)
throws LDAPPersistException;
/**
* Encodes the provided method to an LDAP attribute.
*
* @param method The method to be encoded.
* @param value The value returned by the method in the object to be
* encoded.
* @param name The name to use for the constructed attribute.
*
* @return The attribute containing the encoded representation of the
* provided method value.
*
* @throws LDAPPersistException If a problem occurs while attempting to
* construct an attribute for the method.
*/
public abstract Attribute encodeMethodValue(Method method, Object value,
String name)
throws LDAPPersistException;
/**
* Updates the provided object to assign a value for the specified field from
* the contents of the given attribute.
*
* @param field The field to update in the provided object.
* @param object The object to be updated.
* @param attribute The attribute whose value(s) should be used to update
* the specified field in the given object.
*
* @throws LDAPPersistException If a problem occurs while attempting to
* assign a value to the specified field.
*/
public abstract void decodeField(Field field, Object object,
Attribute attribute)
throws LDAPPersistException;
/**
* Assigns a {@code null} value to the provided field, if possible. If the
* field type is primitive and cannot be assigned a {@code null} value, then a
* default primitive value will be assigned instead (0 for numeric values,
* false for {@code boolean} values, and the null character for {@code char}
* values).
*
* @param f The field to which the {@code null} value should be assigned.
* It must not be {@code null} and must be marked with the
* {@link LDAPField} annotation.
* @param o The object to be updated. It must not be {@code null}, and the
* class must be marked with the {@link LDAPObject annotation}.
*
* @throws LDAPPersistException If a problem occurs while attempting to
* assign a {@code null} value to the specified
* field.
*/
public void setNull(final Field f, final Object o)
throws LDAPPersistException
{
try
{
f.setAccessible(true);
final Class type = f.getType();
if (type.equals(Boolean.TYPE))
{
f.set(o, Boolean.FALSE);
}
else if (type.equals(Byte.TYPE))
{
f.set(o, (byte) 0);
}
else if (type.equals(Character.TYPE))
{
f.set(o, '\u0000');
}
else if (type.equals(Double.TYPE))
{
f.set(o, 0.0d);
}
else if (type.equals(Float.TYPE))
{
f.set(o, 0.0f);
}
else if (type.equals(Integer.TYPE))
{
f.set(o, 0);
}
else if (type.equals(Long.TYPE))
{
f.set(o, 0L);
}
else if (type.equals(Short.TYPE))
{
f.set(o, (short) 0);
}
else
{
f.set(o, null);
}
}
catch (final Exception e)
{
Debug.debugException(e);
throw new LDAPPersistException(
ERR_ENCODER_CANNOT_SET_NULL_FIELD_VALUE.get(f.getName(),
o.getClass().getName(), StaticUtils.getExceptionMessage(e)),
e);
}
}
/**
* Invokes the provided setter method with a single argument that will set a
* {@code null} value for that method, if possible. If the argument type is
* and cannot be assigned a {@code null} value, then a default primitive value
* will be assigned instead (0 for numeric values, false for {@code boolean}
* values, and the null character for {@code char} values).
*
* @param m The setter method that should be used to set the {@code null}
* value. It must not be {@code null}, and must have the
* {@code LDAPSetter} annotation.
* @param o The object to be updated. It must not be {@code null}, and the
* class must be marked with the {@link LDAPObject annotation}.
*
* @throws LDAPPersistException If a problem occurs while attempting to
* assign a {@code null} value to the specified
* field.
*/
public void setNull(final Method m, final Object o)
throws LDAPPersistException
{
try
{
m.setAccessible(true);
final Class type = m.getParameterTypes()[0];
if (type.equals(Boolean.TYPE))
{
m.invoke(o, Boolean.FALSE);
}
else if (type.equals(Byte.TYPE))
{
m.invoke(o, (byte) 0);
}
else if (type.equals(Character.TYPE))
{
m.invoke(o, '\u0000');
}
else if (type.equals(Double.TYPE))
{
m.invoke(o, 0.0d);
}
else if (type.equals(Float.TYPE))
{
m.invoke(o, 0.0f);
}
else if (type.equals(Integer.TYPE))
{
m.invoke(o, 0);
}
else if (type.equals(Long.TYPE))
{
m.invoke(o, 0L);
}
else if (type.equals(Short.TYPE))
{
m.invoke(o, (short) 0);
}
else
{
m.invoke(o, type.cast(null));
}
}
catch (final Exception e)
{
Debug.debugException(e);
throw new LDAPPersistException(
ERR_ENCODER_CANNOT_SET_NULL_METHOD_VALUE.get(m.getName(),
o.getClass().getName(), StaticUtils.getExceptionMessage(e)),
e);
}
}
/**
* Updates the provided object to invoke the specified method to set a value
* from the contents of the given attribute.
*
* @param method The method to invoke in the provided object.
* @param object The object to be updated.
* @param attribute The attribute whose value(s) should be used to update
* the specified method in the given object.
*
* @throws LDAPPersistException If a problem occurs while attempting to
* determine the value or invoke the specified
* method.
*/
public abstract void invokeSetter(Method method, Object object,
Attribute attribute)
throws LDAPPersistException;
}