Examples of org.springframework.expression.PropertyAccessor

org.springframework.expression.PropertyAccessor
A property accessor is able to read (and possibly write) to object properties. The interface places no restrictions and so implementors are free to access properties directly as fields or through getters or in any other way they see as appropriate. A resolver can optionally specify an array of target classes for which it should be called - but if it returns null from getSpecificTargetClasses() then it will be called for all property references and given a chance to determine if it can read or write them. Property resolvers are considered to be ordered and each will be called in turn. The only rule that affects the call order is that any naming the target class directly in getSpecifiedTargetClasses() will be called first, before the general resolvers. @author Andy Clement @since 3.0


    if (targetObject == null && this.nullSafe) {
      return TypedValue.NULL;
    }


    PropertyAccessor accessorToUse = this.cachedReadAccessor;
    if (accessorToUse != null) {
      try {
        return accessorToUse.read(eContext, contextObject.getValue(), name);
      }
      catch (AccessException ae) {
        // this is OK - it may have gone stale due to a class change,
        // let's try to get a new one and call it before giving up
        this.cachedReadAccessor = null;

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    if (contextObject.getValue() == null && nullSafe) {
      return;
    }


    PropertyAccessor accessorToUse = this.cachedWriteAccessor;
    if (accessorToUse != null) {
      try {
        accessorToUse.write(eContext, contextObject.getValue(), name, newValue);
        return;
      }
      catch (AccessException ae) {
        // this is OK - it may have gone stale due to a class change,
        // let's try to get a new one and call it before giving up

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    if (targetObject == null && this.nullSafe) {
      return TypedValue.NULL;
    }


    PropertyAccessor accessorToUse = this.cachedReadAccessor;
    if (accessorToUse != null) {
      try {
        return accessorToUse.read(state.getEvaluationContext(), contextObject.getValue(), name);
      }
      catch (AccessException ae) {
        // this is OK - it may have gone stale due to a class change,
        // let's try to get a new one and call it before giving up
        this.cachedReadAccessor = null;

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    if (contextObject.getValue() == null && nullSafe) {
      return;
    }


    PropertyAccessor accessorToUse = this.cachedWriteAccessor;
    if (accessorToUse != null) {
      try {        
        accessorToUse.write(state.getEvaluationContext(), contextObject.getValue(), name, newValue);
        return;
      }
      catch (AccessException ae) {
        // this is OK - it may have gone stale due to a class change,
        // let's try to get a new one and call it before giving up

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    if (targetObject == null && nullSafe) {
      return TypedValue.NULL;
    }


    PropertyAccessor accessorToUse = this.cachedReadAccessor;
    if (accessorToUse != null) {
      try {
        return accessorToUse.read(state.getEvaluationContext(), contextObject.getValue(), name);
      }
      catch (AccessException ae) {
        // this is OK - it may have gone stale due to a class change,
        // let's try to get a new one and call it before giving up
        this.cachedReadAccessor = null;

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    if (contextObject.getValue() == null && nullSafe) {
      return;
    }


    PropertyAccessor accessorToUse = this.cachedWriteAccessor;
    if (accessorToUse != null) {
      try {        
        accessorToUse.write(state.getEvaluationContext(), contextObject.getValue(), name, newValue);
        return;
      }
      catch (AccessException ae) {
        // this is OK - it may have gone stale due to a class change,
        // let's try to get a new one and call it before giving up

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    checkTemplateParsingError("Hello ${", "No ending suffix '}' for expression starting at character 6: ${");
  }


  @Test
  public void accessingNullPropertyViaReflection_SPR5663() throws AccessException {
    PropertyAccessor propertyAccessor = new ReflectivePropertyAccessor();
    EvaluationContext context = TestScenarioCreator.getTestEvaluationContext();
    assertFalse(propertyAccessor.canRead(context, null, "abc"));
    assertFalse(propertyAccessor.canWrite(context, null, "abc"));
    try {
      propertyAccessor.read(context, null, "abc");
      fail("Should have failed with an AccessException");
    }
    catch (AccessException ae) {
      // success
    }
    try {
      propertyAccessor.write(context, null, "abc", "foo");
      fail("Should have failed with an AccessException");
    }
    catch (AccessException ae) {
      // success
    }

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    EvaluationContext ctx = new StandardEvaluationContext(t);
//    assertTrue(rpr.canRead(ctx, t, "property"));
//    assertEquals("hello",rpr.read(ctx, t, "property").getValue());
//    assertEquals("hello",rpr.read(ctx, t, "property").getValue()); // cached accessor used


    PropertyAccessor optA = rpr.createOptimalAccessor(ctx, t, "property");
    assertTrue(optA.canRead(ctx, t, "property"));
    assertFalse(optA.canRead(ctx, t, "property2"));
    try {
      optA.canWrite(ctx, t, "property");
      fail();
    }
    catch (UnsupportedOperationException uoe) {
      // success
    }
    try {
      optA.canWrite(ctx, t, "property2");
      fail();
    }
    catch (UnsupportedOperationException uoe) {
      // success
    }
    assertEquals("hello",optA.read(ctx, t, "property").getValue());
    assertEquals("hello",optA.read(ctx, t, "property").getValue()); // cached accessor used


    try {
      optA.getSpecificTargetClasses();
      fail();
    }
    catch (UnsupportedOperationException uoe) {
      // success
    }
    try {
      optA.write(ctx,t,"property",null);
      fail();
    }
    catch (UnsupportedOperationException uoe) {
      // success
    }


    optA = rpr.createOptimalAccessor(ctx, t, "field");
    assertTrue(optA.canRead(ctx, t, "field"));
    assertFalse(optA.canRead(ctx, t, "field2"));
    try {
      optA.canWrite(ctx, t, "field");
      fail();
    }
    catch (UnsupportedOperationException uoe) {
      // success
    }
    try {
      optA.canWrite(ctx, t, "field2");
      fail();
    }
    catch (UnsupportedOperationException uoe) {
      // success
    }
    assertEquals(3,optA.read(ctx, t, "field").getValue());
    assertEquals(3,optA.read(ctx, t, "field").getValue()); // cached accessor used


    try {
      optA.getSpecificTargetClasses();
      fail();
    }
    catch (UnsupportedOperationException uoe) {
      // success
    }
    try {
      optA.write(ctx,t,"field",null);
      fail();
    }
    catch (UnsupportedOperationException uoe) {
      // success
    }

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    if (targetObject == null && nullSafe) {
      return TypedValue.NULL;
    }


    PropertyAccessor accessorToUse = this.cachedReadAccessor;
    if (accessorToUse != null) {
      try {
        return accessorToUse.read(state.getEvaluationContext(), contextObject.getValue(), name);
      }
      catch (AccessException ae) {
        // this is OK - it may have gone stale due to a class change,
        // let's try to get a new one and call it before giving up
        this.cachedReadAccessor = null;

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    if (contextObject.getValue() == null && nullSafe) {
      return;
    }


    PropertyAccessor accessorToUse = this.cachedWriteAccessor;
    if (accessorToUse != null) {
      try {        
        accessorToUse.write(state.getEvaluationContext(), contextObject.getValue(), name, newValue);
        return;
      }
      catch (AccessException ae) {
        // this is OK - it may have gone stale due to a class change,
        // let's try to get a new one and call it before giving up

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