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The addc-slp library supplies client classes for registering objects with a Service Location Protocol Daemon and for looking theses objects up later.

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package com.addc.commons.slp.messages;

import java.io.DataOutputStream;
import java.io.IOException;

import com.addc.commons.slp.SLPConstants;
import com.addc.commons.slp.ServiceType;
import com.addc.commons.slp.configuration.SLPConfig;

/**
 * The ServiceRequest SLP Message.
 */
public class ServiceRequest extends UAMessage {
    private ServiceType serviceType;
    private String scopes;
    private String searchFilter;
    private String spi;

    /**
     * Create a new ServiceRequest with DEFAULT SPI
     *
     * @param config
     *            The configuration to use
     * @param serviceType
     *            The service type
     */
    public ServiceRequest(SLPConfig config, ServiceType serviceType) {
        this(config, serviceType, "*");
    }

    /**
     * Create a new ServiceRequest
     *
     * @param config
     *            The configuration to use
     * @param serviceType
     *            The service type
     * @param searchFilter
     *            The filter
     */
    public ServiceRequest(SLPConfig config, ServiceType serviceType, String searchFilter) {
        super(config, SLPConstants.SRVRQST);
        this.serviceType= serviceType;
        this.scopes= config.getScopes();
        this.searchFilter= searchFilter == null ? "" : searchFilter;
        if (config.isSecurityEnabled()) {
            this.spi= config.getSPI();
        } else {
            spi= "";
        }
    }

    @Override
    public int calcSize() {
        return 10 + getResponders().length() + serviceType.toString().length() + scopes.length() + searchFilter.length()
                + spi.length();
    }

    @Override
    protected void writeBody(DataOutputStream out) throws IOException {
        out.writeUTF(getResponders());
        out.writeUTF(serviceType.toString());
        out.writeUTF(scopes);
        out.writeUTF(searchFilter);
        out.writeUTF(spi);
    }

    @Override
    public int hashCode() {
        final int prime= 31;
        int result= super.hashCode();
        result= prime * result + scopes.hashCode();
        result= prime * result + searchFilter.hashCode();
        result= prime * result + serviceType.hashCode();
        result= prime * result + spi.hashCode();
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj == null) {
            return false;
        }
        if (!(obj instanceof ServiceRequest)) {
            return false;
        }
        ServiceRequest other= (ServiceRequest) obj;
        return (super.equals(obj) && scopes.equals(other.scopes) && searchFilter.equals(other.searchFilter)
                && serviceType.equals(other.serviceType) && spi.equals(other.spi));
    }

    @Override
    public String toString() {
        StringBuilder builder= new StringBuilder();
        builder.append("ServiceRequest [");
        builder.append(super.toString());
        builder.append(", serviceType=");
        builder.append(serviceType);
        builder.append(", scopes=");
        builder.append(scopes);
        builder.append(", searchFilter=");
        builder.append(searchFilter);
        builder.append(", spi=");
        builder.append(spi);
        builder.append(']');
        return builder.toString();
    }

}