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As indicated by the name, a two-way bridge converts the information back and forth from the object model to the Lucene model. Bridges that degrade information, such as the rounding bridge described in listing 4.4, are not good candidates because there s no way to extract the original information from Lucene. Two-way bridges are necessary when the bridge is used on either:
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An identifier property A property meant to be projected (read back from the index)
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A two-way bridge that aims to convert an object to and from a string representation implements org.hibernate.search.bridge.TwoWayStringBridge. Listing 4.5 shows an implementation.
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Listing 4.5 Implementation of a two-way bridge
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@Entity @Indexed public class Item { @Field @FieldBridge( impl=PaddedPriceBridge.class ) private double price; ... }
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Declare the bridge implementation
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/** * pad a price with up to 3 non-significant 0s Implements * Accept double and Double TwoWayStringBridge */ public class PaddedPriceBridge implements TwoWayStringBridge { public static int PAD = 3; public String objectToString(Object value) {
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Mapping more advanced data structures
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if ( value == null ) return null; if (value instanceof Double) { return pad( (Double) value ); } else { throw new IllegalArgumentException(PaddedRoundedPriceBridge.class + " used on a non double type: " + value.getClass() ); } Reverse } public Object stringToObject(String price) { return Double.parseDouble(price); }
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C operation
objectToString
private String pad(double price) { String rawDouble = Double.toString(price); int dotIndex = rawDouble.indexOf('.'); if (dotIndex == -1) dotIndex = rawDouble.length(); if (dotIndex > PAD) throw new IllegalArgumentException( "Try to pad on a too big number" ); StringBuilder paddedLong = new StringBuilder( ); for ( int padIndex = dotIndex ; padIndex < PAD ; padIndex++ ) { paddedLong.append('0'); } return paddedLong.append( rawDouble ).toString(); } }
A two-way bridge implements TwoWayStringBridge. C Two-way string bridges implement the conversion between the string representation stored in the Lucene index and the object representation. There s nothing spectacular in listing 4.5. The TwoWayStringBridge interface includes a stringToObject method; the method takes the string value stored in the Lucene index as a parameter and expects the object representation as the return value. In addition to the rules and common practices we ve discussed for regular StringBridges, TwoWayStringBridges should ensure that the object passed as an argument and the result of the operation bridge.stringToObject( bridge.objectToString( object ) ) are similar from a user s point of view. In Java land it usually translates as being equal per the Object equals operation. If the bridge doesn t follow this rule, it cannot be used for identity properties, and the projected results are likely to surprise your users because the values retrieved would not be the values stored. While not all one-way bridges can support the two-way contract, the authors encourage you to try to use two-way bridge contracts as much as possible. It s much easier to design a two-way bridge from the ground up than to morph a one-way bridge into a two-way bridge. You may have noticed in the last two examples that the padding choice is hardcoded into the bridge. It s not possible to reuse the same bridge for numbers larger
Mapping the unexpected: custom bridges
than 1000. While it was a decent choice for prices in a store that sells DVDs and food, what happens if we start to develop a side business around a home cinema The padding value more likely should be set to 5. Why not make it a parameter
Injecting parameters to bridges
You can declare parameters in a bridge declaration. Providing parameters allows the bridge implementation to be more generic. To receive parameters, bridges need to implement the ParameterizedBridge interface. Let s enhance listing 4.4. Listing 4.6 uses parameters injected at declaration time.
Listing 4.6 Inject parameters by implementing ParameterizedBridge
@Entity @Indexed public class Item { @Field @FieldBridge( impl=ParameterizedPaddedRoundedPriceBridge.class, params= { @Parameter(name="pad", value="3"), @Parameter(name="round", value="5") } ) Inject parameters private double price; ... } /** * Round a price by range of round, going to * the upper boundaries; pad the result with up to pad * non-significant 0s. * Accept double and Double */ public class ParameterizedPaddedRoundedPriceBridge implements StringBridge, ParameterizedBridge { private int pad = 6; //9,999,999 private double round = 1d; //by default round to the next non decimal amount public void setParameterValues(Map parameters) {
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