AbstractCustomDataAccessorBuilder.java

package org.springframework.roo.model;

import org.apache.commons.lang3.Validate;

/**
 * Assists in the creation of a {@link Builder} for types that eventually
 * implement {@link CustomDataAccessor}.
 * 
 * @author Ben Alex
 * @since 1.1
 */
public abstract class AbstractCustomDataAccessorBuilder<T extends CustomDataAccessor> implements
    Builder<T> {

  private CustomDataBuilder customDataBuilder;

  /**
   * Constructor for an empty builder
   */
  protected AbstractCustomDataAccessorBuilder() {
    this.customDataBuilder = new CustomDataBuilder();
  }

  /**
   * Constructor for a builder initialised with the given custom data
   * 
   * @param existing can't be <code>null</code>
   */
  protected AbstractCustomDataAccessorBuilder(final CustomDataAccessor existing) {
    Validate.notNull(existing, "Custom data accessor required");
    this.customDataBuilder = new CustomDataBuilder(existing.getCustomData());
  }

  /**
   * Appends the given custom data to this builder
   * 
   * @param customDataBuilder the custom data to append; can be
   *            <code>null</code> to make no changes
   */
  public void append(final CustomData customData) {
    if (customData != null) {
      // Set the custom data builder to a new instance containing both
      // builders' values
      final CustomDataBuilder customDataBuilder = new CustomDataBuilder(customData);
      customDataBuilder.append(this.customDataBuilder.build());
      this.customDataBuilder = customDataBuilder;
    }
  }

  public CustomDataBuilder getCustomData() {
    return this.customDataBuilder;
  }

  public Object putCustomData(final Object key, final Object value) {
    return customDataBuilder.put(key, value);
  }

  /**
   * Sets this builder's {@link CustomDataBuilder} to the given one (does not
   * take a copy)
   * 
   * @param customDataBuilder the builder to set (required)
   */
  public void setCustomData(final CustomDataBuilder customDataBuilder) {
    Validate.notNull(customDataBuilder, "Custom data builder required");
    this.customDataBuilder = customDataBuilder;
  }
}