Examples with CompilerContextImpl org.apache.derby.impl.sql.compile.CompilerContextImpl used on opensource projects

Example 1 with CompilerContextImpl

use of org.apache.derby.impl.sql.compile.CompilerContextImpl in project derby by apache.

the class GenericLanguageConnectionContext method pushCompilerContext.

/**
 * Push a CompilerContext on the context stack with
 * the passed in schema sd as the default schema
 * we compile against.
 *
 * @param sd the default schema
 *
 * @return the compiler context
 *
 * For the parameter sd, there are 3 possible values(of interest) that can
 * get passed into this method:
 *
 * a) A null SchemaDescriptor which indicates to the system to use the
 *    CURRENT SCHEMA as the compilation schema.
 *
 * b) A SchemaDescriptor with its UUID == null, this indicates that either
 *    the schema has not been physically created yet or that the LCC's
 *    getDefaultSchema() is not yet up-to-date with its actual UUID.
 *    The system will use the CURRENT SCHEMA as the compilation schema.
 *
 * c) A SchemaDescriptor with its UUID != null, this means that the schema
 *    has been physically created.  The system will use this schema as the
 *    compilation schema (e.g.: for trigger or view recompilation cases,
 *    etc.).
 *
 * The compiler context's compilation schema will be set accordingly based
 * on the given input above.
 */
public CompilerContext pushCompilerContext(SchemaDescriptor sd) {
    CompilerContext cc;
    boolean firstCompilerContext = false;
    // DEBUG   END
    cc = (CompilerContext) (getContextManager().getContext(CompilerContext.CONTEXT_ID));
    /*
        ** If there is no compiler context, this is the first one on the
        ** stack, so don't pop it when we're done (saves time).
        */
    if (cc == null) {
        firstCompilerContext = true;
    }
    if (cc == null || cc.getInUse()) {
        cc = new CompilerContextImpl(getContextManager(), this, tcf);
        if (firstCompilerContext) {
            cc.firstOnStack();
        }
    } else {
        /* Reset the next column,table, subquery and ResultSet numbers at 
            * the beginning of each statement 
            */
        cc.resetContext();
    }
    cc.setInUse(true);
    StatementContext sc = getStatementContext();
    if (sc.getSystemCode())
        cc.setReliability(CompilerContext.INTERNAL_SQL_LEGAL);
    /*
         * Set the compilation schema when its UUID is available.
         * i.e.:  Schema may not have been physically created yet, so
         *        its UUID will be null.
         * 
         * o For trigger SPS recompilation, the system must use its
         *   compilation schema to recompile the statement. 
         * 
         * o For view recompilation, we set the compilation schema
         *   for this compiler context if its UUID is available.
         *   Otherwise, the compilation schema will be determined
         *   at execution time of view creation.
         */
    if (sd != null && sd.getUUID() != null) {
        cc.setCompilationSchema(sd);
    }
    return cc;
}