/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE
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* or https://OpenDS.dev.java.net/OpenDS.LICENSE.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE. If applicable,
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* add the following below this CDDL HEADER, with the fields enclosed
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* by brackets "[]" replaced with your own identifying information:
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* Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*
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*
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* Copyright 2009-2010 Sun Microsystems, Inc.
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*/
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package org.opends.sdk.controls;
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import static com.sun.opends.sdk.messages.Messages.ERR_PREREADRESP_CANNOT_DECODE_VALUE;
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import static com.sun.opends.sdk.messages.Messages.ERR_PREREADRESP_NO_CONTROL_VALUE;
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import static com.sun.opends.sdk.messages.Messages.ERR_PREREAD_CONTROL_BAD_OID;
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import java.io.IOException;
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import org.opends.sdk.*;
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import org.opends.sdk.asn1.ASN1;
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import org.opends.sdk.asn1.ASN1Reader;
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import org.opends.sdk.asn1.ASN1Writer;
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import org.opends.sdk.responses.Responses;
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import org.opends.sdk.responses.SearchResultEntry;
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import com.sun.opends.sdk.ldap.LDAPUtils;
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import com.sun.opends.sdk.util.StaticUtils;
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import com.sun.opends.sdk.util.Validator;
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/**
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* The pre-read response control as defined in RFC 4527. This control is
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* returned by the server in response to a successful update operation which
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* included a pre-read request control. The control contains a Search Result
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* Entry containing, subject to access controls and other constraints, values of
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* the requested attributes.
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*
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* @see PreReadRequestControl
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* @see <a href="http://tools.ietf.org/html/rfc4527">RFC 4527 - Lightweight
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* Directory Access Protocol (LDAP) Read Entry Controls </a>
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*/
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public final class PreReadResponseControl implements Control
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{
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/**
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* The IANA-assigned OID for the LDAP pre-read response control used for
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* retrieving an entry in the state it had immediately before an update was
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* applied.
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*/
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public static final String OID = PreReadRequestControl.OID;
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/**
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* A decoder which can be used for decoding the pre-read response control.
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*/
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public static final ControlDecoder<PreReadResponseControl> DECODER =
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new ControlDecoder<PreReadResponseControl>()
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{
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public PreReadResponseControl decodeControl(final Control control,
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final DecodeOptions options) throws DecodeException
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{
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Validator.ensureNotNull(control);
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if (control instanceof PreReadResponseControl)
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{
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return (PreReadResponseControl) control;
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}
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if (!control.getOID().equals(OID))
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{
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final LocalizableMessage message = ERR_PREREAD_CONTROL_BAD_OID.get(
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control.getOID(), OID);
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throw DecodeException.error(message);
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}
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if (!control.hasValue())
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{
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// The control must always have a value.
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final LocalizableMessage message = ERR_PREREADRESP_NO_CONTROL_VALUE
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.get();
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throw DecodeException.error(message);
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}
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final ASN1Reader reader = ASN1.getReader(control.getValue());
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SearchResultEntry searchEntry;
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try
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{
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searchEntry = LDAPUtils.decodeSearchResultEntry(reader, options);
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}
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catch (final IOException le)
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{
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StaticUtils.DEBUG_LOG.throwing("PreReadResponseControl",
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"decodeControl", le);
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final LocalizableMessage message = ERR_PREREADRESP_CANNOT_DECODE_VALUE
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.get(le.getMessage());
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throw DecodeException.error(message, le);
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}
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/**
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* FIXME: the RFC states that the control contains a SearchResultEntry
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* rather than an Entry. Can we assume that the response will not contain
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* a nested set of controls?
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*/
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return new PreReadResponseControl(control.isCritical(), Entries
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.unmodifiableEntry(searchEntry));
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}
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public String getOID()
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{
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return OID;
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}
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};
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/**
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* Creates a new pre-read response control.
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*
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* @param entry
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* The entry whose contents reflect the state of the updated entry
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* immediately before the update operation was performed.
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* @return The new control.
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* @throws NullPointerException
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* If {@code entry} was {@code null}.
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*/
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public static PreReadResponseControl newControl(final Entry entry)
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throws NullPointerException
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{
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/**
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* FIXME: all other control implementations are fully immutable. We should
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* really do a defensive copy here in order to be consistent, rather than
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* just wrap it. Also, the RFC states that the control contains a
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* SearchResultEntry rather than an Entry. Can we assume that the response
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* will not contain a nested set of controls?
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*/
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return new PreReadResponseControl(false, Entries.unmodifiableEntry(entry));
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}
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private final Entry entry;
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private final boolean isCritical;
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private PreReadResponseControl(final boolean isCritical, final Entry entry)
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{
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this.isCritical = isCritical;
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this.entry = entry;
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}
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/**
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* Returns an unmodifiable entry whose contents reflect the state of the
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* updated entry immediately before the update operation was performed.
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*
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* @return The unmodifiable entry whose contents reflect the state of the
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* updated entry immediately before the update operation was
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* performed.
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*/
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public Entry getEntry()
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{
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return entry;
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}
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/**
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* {@inheritDoc}
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*/
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public String getOID()
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{
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return OID;
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}
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/**
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* {@inheritDoc}
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*/
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public ByteString getValue()
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{
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final ByteStringBuilder buffer = new ByteStringBuilder();
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final ASN1Writer writer = ASN1.getWriter(buffer);
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try
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{
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LDAPUtils.encodeSearchResultEntry(writer, Responses
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.newSearchResultEntry(entry));
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return buffer.toByteString();
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}
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catch (final IOException ioe)
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{
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// This should never happen unless there is a bug somewhere.
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throw new RuntimeException(ioe);
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}
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}
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/**
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* {@inheritDoc}
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*/
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public boolean hasValue()
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{
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return true;
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}
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/**
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* {@inheritDoc}
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*/
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public boolean isCritical()
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{
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return isCritical;
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public String toString()
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{
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final StringBuilder builder = new StringBuilder();
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builder.append("PreReadResponseControl(oid=");
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builder.append(getOID());
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builder.append(", criticality=");
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builder.append(isCritical());
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builder.append(", entry=");
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builder.append(entry);
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builder.append(")");
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return builder.toString();
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}
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}
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