import org.apache.cassandra.cql3.Relation; //导入依赖的package包/类
public Builder add(ByteBuffer buffer, Relation.Type op)
{
    if (components.size() >= composite.types.size())
        throw new IllegalStateException("Composite column is already fully constructed");

    int current = components.size();
    components.add(buffer);

    /*
     * Given the rules for eoc (end-of-component, see AbstractCompositeType.compare()),
     * We can select:
     *   - = 'a' by using <'a'><0>
     *   - < 'a' by using <'a'><-1>
     *   - <= 'a' by using <'a'><1>
     *   - > 'a' by using <'a'><1>
     *   - >= 'a' by using <'a'><0>
     */
    switch (op)
    {
        case LT:
            endOfComponents[current] = (byte) -1;
            break;
        case GT:
        case LTE:
            endOfComponents[current] = (byte) 1;
            break;
        default:
            endOfComponents[current] = (byte) 0;
            break;
    }
    return this;
}
 

import org.apache.cassandra.cql3.Relation; //导入依赖的package包/类
/**
 * Creates a new <code>UnrecognizedEntityException</code>.
 * @param entity the unrecognized entity
 * @param relation the entity relation
 */
public UnrecognizedEntityException(ColumnIdentifier entity, Relation relation)
{
    super(String.format("Undefined name %s in where clause ('%s')", entity, relation));
    this.entity = entity;
    this.relation = relation;
}
 

import org.apache.cassandra.cql3.Relation; //导入依赖的package包/类
public ByteBuffer buildForRelation(Relation.Type op)
{
    /*
     * Given the rules for eoc (end-of-component, see AbstractCompositeType.compare()),
     * We can select:
     *   - = 'a' by using <'a'><0>
     *   - < 'a' by using <'a'><-1>
     *   - <= 'a' by using <'a'><1>
     *   - > 'a' by using <'a'><1>
     *   - >= 'a' by using <'a'><0>
     */
    int current = components.size() - 1;
    switch (op)
    {
        case LT:
            endOfComponents[current] = (byte) -1;
            break;
        case GT:
        case LTE:
            endOfComponents[current] = (byte) 1;
            break;
        default:
            endOfComponents[current] = (byte) 0;
            break;
    }
    return build();
}
 

import org.apache.cassandra.cql3.Relation; //导入依赖的package包/类
public EdgeSelector(){
	this.edgeWhere = new ArrayList<Relation>();
	this.endWhere = new ArrayList<Relation>();
}
 

import org.apache.cassandra.cql3.Relation; //导入依赖的package包/类
public void setEdgeWhere(List<Relation> edgeWhere){
	this.edgeWhere = edgeWhere;
}
 

import org.apache.cassandra.cql3.Relation; //导入依赖的package包/类
public void setEndWhere(List<Relation> endWhere){
	this.endWhere = endWhere;
}
 

import org.apache.cassandra.cql3.Relation; //导入依赖的package包/类
public List<Relation> getEdgeWhere(){
	return this.edgeWhere;
}
 

import org.apache.cassandra.cql3.Relation; //导入依赖的package包/类
public List<Relation> getEndWhere(){
	return this.endWhere;
}