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package oracle.toplink.essentials.tools.schemaframework;

import java.io.*;
import oracle.toplink.essentials.exceptions.*;
import oracle.toplink.essentials.internal.sessions.AbstractSession;

/**
 * <p>
 * <b>Purpose</b>: Allow for creation of views.
 * <p>
 */
public class ViewDefinition extends DatabaseObjectDefinition {
    protected String selectClause;

    public ViewDefinition() {
        super();
        this.selectClause = "";
    }

    /**
     * INTERNAL:
     * Return the DDL to create the view.
     */
    public Writer buildCreationWriter(AbstractSession session, Writer writer) throws ValidationException {
        try {
            writer.write(session.getPlatform().getCreateViewString());
            writer.write(getFullName());
            writer.write(" AS (");
            writer.write(getSelectClause());
            writer.write(")");
        } catch (IOException ioException) {
            throw ValidationException.fileError(ioException);
        }
        return writer;
    }

    /**
     * INTERNAL:
     * Return the DDL to drop the view.
     */
    public Writer buildDeletionWriter(AbstractSession session, Writer writer) throws ValidationException {
        try {
            writer.write("DROP VIEW " + getFullName());
        } catch (IOException ioException) {
            throw ValidationException.fileError(ioException);
        }
        return writer;
    }

    /**
     * The select clause is the select statement that is mapped into the view.
     * This is database specific SQL code.
     */
    public String getSelectClause() {
        return selectClause;
    }

    /**
     * The select clause is the select statement that is mapped into the view.
     * This is database specific SQL code.
     */
    public void setSelectClause(String selectClause) {
        this.selectClause = selectClause;
    }
}