# ColumnConsumer.java

    package org.codefilarete.stalactite.sql.result;

    import java.sql.ResultSet;
    import java.util.function.BiConsumer;
    import java.util.function.Function;

    import org.codefilarete.reflection.Mutator;
    import org.codefilarete.stalactite.sql.statement.binder.ResultSetReader;

    /**
     * A simple wire between a (or more) column name of a {@link ResultSet} and a function (setter) of a bean through a {@link BiConsumer}.
     * For example: <br/>
     * <code>new ColumnConsumer("isActive", DefaultResultSetReaders.BOOLEAN_READER, MyClass::setActive)</code>
     *
     * @param <C> assembled bean type
     * @param <I> bean identifier type
     * @author Guillaume Mary
     */
    public class ColumnConsumer<C, I> implements ResultSetRowAssembler<C> {

    	private final ColumnReader<I> reader;
    	private final Mutator<C, I> propertySetter;

    	/**
    	 * General constructor which accept {@link SingleColumnReader} or {@link MultipleColumnsReader}
    	 *
    	 * @param reader any {@link SingleColumnReader} or {@link MultipleColumnsReader}
    	 * @param propertySetter a consumer that is expected to set a property of a bean with value given by reader
    	 */
    	public ColumnConsumer(ColumnReader<I> reader, Mutator<C, I> propertySetter) {
    		this.reader = reader;
    		this.propertySetter = propertySetter;
    	}

    	/**
    	 * Detailed constructor for a {@link SingleColumnReader} case
    	 *
    	 * @param columnName the column name to be read
    	 * @param reader column type reader
    	 * @param propertySetter a consumer that is expected to set a property of a bean with value given by reader
    	 */
    	public ColumnConsumer(String columnName, ResultSetReader<I> reader, Mutator<C, I> propertySetter) {
    		this(new SingleColumnReader<>(columnName, reader), propertySetter);
    	}

    	/**
    	 * @return the given reader at construction time
    	 */
    	public ColumnReader<I> getReader() {
    		return reader;
    	}

    	/**
    	 * @return the given consumer at construction time
    	 */
    	public Mutator<C, I> getPropertySetter() {
    		return propertySetter;
    	}

    	/**
    	 * Applies the column value from the {@link ResultSet} onto the instance through the given consumer (at construction time)
    	 *
    	 * @param instance a bean, not null
    	 * @param resultSet the source of data
    	 */
    	@Override
    	public void assemble(C instance, ResultSet resultSet) {
    		propertySetter.set(instance, reader.read(resultSet));
    	}

    	@Override
    	public ColumnConsumer<C, I> copyWithAliases(Function<String, String> columnMapping) {
    		return new ColumnConsumer<>(reader.copyWithAliases(columnMapping), propertySetter);
    	}
    }