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Efficient, scalable, and flexible Java implementation of the Short Messaging Peer to Peer Protocol (SMPP)
package com.cloudhopper.smpp.pdu;
/*
* #%L
* ch-smpp
* %%
* Copyright (C) 2009 - 2015 Cloudhopper by Twitter
* %%
* Licensed 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.
* #L%
*/
import com.cloudhopper.commons.util.HexUtil;
import com.cloudhopper.smpp.SmppConstants;
import com.cloudhopper.smpp.tlv.Tlv;
import com.cloudhopper.smpp.transcoder.PduTranscoderContext;
import com.cloudhopper.smpp.util.ByteBufUtil;
import java.util.ArrayList;
import io.netty.buffer.ByteBuf;
import com.cloudhopper.smpp.type.RecoverablePduException;
import com.cloudhopper.smpp.type.UnrecoverablePduException;
public abstract class Pdu {
private final String name;
private final boolean isRequest;
private Integer commandLength; // we'll know the size not calculated yet if null
private final int commandId;
private int commandStatus;
private Integer sequenceNumber; // we'll know its not assigned yet if null
// optional parameters (there aren't many, no need for a map)
private ArrayList optionalParameters;
// a reference object that a caller can attach to this pdu
private Object referenceObject;
public Pdu(int commandId, String name, boolean isRequest) {
this.name = name;
this.isRequest = isRequest;
this.commandLength = null;
this.commandId = commandId;
this.sequenceNumber = null;
this.referenceObject = null;
}
public void setReferenceObject(Object value) {
this.referenceObject = value;
}
public Object getReferenceObject() {
return this.referenceObject;
}
public String getName() {
return this.name;
}
public boolean isRequest() {
return this.isRequest;
}
public boolean isResponse() {
return !this.isRequest;
}
public boolean hasCommandLengthCalculated() {
return (this.commandLength != null);
}
public void removeCommandLength() {
this.commandLength = null;
}
public void setCommandLength(int value) {
this.commandLength = new Integer(value);
}
public int getCommandLength() {
if (this.commandLength == null) {
return 0;
} else {
return this.commandLength.intValue();
}
}
/**
* Calculates and sets the commandLength for the PDU based on all currently
* set values and optional parameters.
* @return The calculated PDU command length
*/
public int calculateAndSetCommandLength() {
int len = SmppConstants.PDU_HEADER_LENGTH + this.calculateByteSizeOfBody() + this.calculateByteSizeOfOptionalParameters();
this.setCommandLength(len);
return len;
}
public int getCommandId() {
return this.commandId;
}
public void setCommandStatus(int value) {
this.commandStatus = value;
}
public int getCommandStatus() {
return this.commandStatus;
}
public boolean hasSequenceNumberAssigned() {
return (this.sequenceNumber != null);
}
public void removeSequenceNumber() {
this.sequenceNumber = null;
}
public void setSequenceNumber(int value) {
this.sequenceNumber = new Integer(value);
}
public int getSequenceNumber() {
if (this.sequenceNumber == null) {
return 0;
} else {
return this.sequenceNumber.intValue();
}
}
public int getOptionalParameterCount() {
if (this.optionalParameters == null) {
return 0;
}
return this.optionalParameters.size();
}
/**
* Gets the current list of optional parameters. If no parameters have been
* added, this will return null.
* @return Null if no parameters added yet, or the list of optional parameters.
*/
public ArrayList getOptionalParameters() {
return this.optionalParameters;
}
/**
* Adds an optional parameter to this PDU. Does not check if the TLV has
* already been added (allows duplicates).
* @param tlv The TLV to add
* @see Pdu#setOptionalParameter(com.cloudhopper.smpp.tlv.Tlv)
*/
public void addOptionalParameter(Tlv tlv) {
if (this.optionalParameters == null) {
this.optionalParameters = new ArrayList();
}
this.optionalParameters.add(tlv);
}
/**
* Removes an optional parameter by tag. Will only remove the first matching
* tag.
* @param tag That tag to remove
* @return Null if no TLV removed, or the TLV removed.
*/
public Tlv removeOptionalParameter(short tag) {
// does this parameter exist?
int i = this.findOptionalParameter(tag);
if (i < 0) {
return null;
} else {
return this.optionalParameters.remove(i);
}
}
/**
* Sets an optional parameter by checking if the tag already exists in our
* list of optional parameters. If it already exists, will replace the old
* value with the new value.
* @param tlv The TLV to add/set
* @return Null if no TLV was replaced, or the TLV replaced.
*/
public Tlv setOptionalParameter(Tlv tlv) {
// does this parameter already exist?
int i = this.findOptionalParameter(tlv.getTag());
if (i < 0) {
// parameter does not yet exist, add it, not replaced
this.addOptionalParameter(tlv);
return null;
} else {
// this parameter already exists, replace it, return old
return this.optionalParameters.set(i, tlv);
}
}
/**
* Checks if an optional parameter by tag exists.
* @param tag The TLV to search for
* @return True if exists, otherwise false
*/
public boolean hasOptionalParameter(short tag) {
return (this.findOptionalParameter(tag) >= 0);
}
protected int findOptionalParameter(short tag) {
if (this.optionalParameters == null) {
return -1;
}
int i = 0;
for (Tlv tlv : this.optionalParameters) {
if (tlv.getTag() == tag) {
return i;
}
i++;
}
// if we get here, we didn't find the parameter by tag
return -1;
}
/**
* Gets a TLV by tag.
* @param tag The TLV tag to search for
* @return The first matching TLV by tag
*/
public Tlv getOptionalParameter(short tag) {
if (this.optionalParameters == null) {
return null;
}
// try to find this parameter's index
int i = this.findOptionalParameter(tag);
if (i < 0) {
return null;
}
return this.optionalParameters.get(i);
}
//
// read & write pdu body
//
abstract protected int calculateByteSizeOfBody();
abstract public void readBody(ByteBuf buffer) throws UnrecoverablePduException, RecoverablePduException;
abstract public void writeBody(ByteBuf buffer) throws UnrecoverablePduException, RecoverablePduException;
abstract protected void appendBodyToString(StringBuilder buffer);
//
// read & write pdu optional parameters
//
protected int calculateByteSizeOfOptionalParameters() {
if (this.optionalParameters == null) {
return 0;
}
int optParamLength = 0;
// otherwise, add length of each tlv
for (Tlv tlv : this.optionalParameters) {
optParamLength += tlv.calculateByteSize();
}
return optParamLength;
}
public void readOptionalParameters(ByteBuf buffer, PduTranscoderContext context) throws UnrecoverablePduException, RecoverablePduException {
// if there is any data left, it's part of an optional parameter
while (buffer.readableBytes() > 0) {
Tlv tlv = ByteBufUtil.readTlv(buffer);
if (tlv.getTagName() == null) {
tlv.setTagName(context.lookupTlvTagName(tlv.getTag()));
}
this.addOptionalParameter(tlv);
}
}
public void writeOptionalParameters(ByteBuf buffer, PduTranscoderContext context) throws UnrecoverablePduException, RecoverablePduException {
if (this.optionalParameters == null) {
return;
}
for (Tlv tlv : this.optionalParameters) {
if (tlv.getTagName() == null) {
tlv.setTagName(context.lookupTlvTagName(tlv.getTag()));
}
ByteBufUtil.writeTlv(buffer, tlv);
}
}
protected void appendOptionalParameterToString(StringBuilder buffer) {
if (this.optionalParameters == null) {
return;
}
int i = 0;
for (Tlv tlv : this.optionalParameters) {
if (i != 0) {
buffer.append(" (");
} else {
buffer.append("(");
}
// format 0x0000 0x0000 [00..]
buffer.append(tlv.toString());
buffer.append(")");
i++;
}
}
@Override
public String toString() {
// our guess of the optimal "toString" buffer size
StringBuilder buffer = new StringBuilder(65 + 300 + (getOptionalParameterCount()*20));
// append PDU header
buffer.append("(");
buffer.append(this.name);
buffer.append(": 0x");
buffer.append(HexUtil.toHexString(getCommandLength()));
buffer.append(" 0x");
buffer.append(HexUtil.toHexString(this.commandId));
buffer.append(" 0x");
buffer.append(HexUtil.toHexString(this.commandStatus));
buffer.append(" 0x");
buffer.append(HexUtil.toHexString(getSequenceNumber()));
// for "responses", attempt to lookup the command status message
if (this instanceof PduResponse) {
PduResponse response = (PduResponse)this;
String statusMessage = response.getResultMessage();
if (statusMessage != null) {
buffer.append(" result: \"");
buffer.append(statusMessage);
buffer.append("\"");
} else {
buffer.append(" result: ");
}
}
buffer.append(")");
// append PDU body
buffer.append(" (body: ");
this.appendBodyToString(buffer);
// append PDU optional parameters
buffer.append(") (opts: ");
this.appendOptionalParameterToString(buffer);
buffer.append(")");
return buffer.toString();
}
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