Examples of javax.el.ValueExpression

javax.el.ValueExpression
An Expression that can get or set a value. In previous incarnations of this API, expressions could only be read. ValueExpression objects can now be used both to retrieve a value and to set a value. Expressions that can have a value set on them are referred to as l-value expressions. Those that cannot are referred to as r-value expressions. Not all r-value expressions can be used as l-value expressions (e.g. "${1+1}" or "${firstName} ${lastName}"). See the EL Specification for details. Expressions that cannot be used as l-values must always return true from isReadOnly(). The {@link ExpressionFactory#createValueExpression(ELContext,String,Class)}method can be used to parse an expression string and return a concrete instance of ValueExpression that encapsulates the parsed expression. The {@link FunctionMapper} is used atparse time, not evaluation time, so one is not needed to evaluate an expression using this class. However, the {@link ELContext} is needed at evaluation time. The {@link #getValue(ELContext)}, {@link #setValue(ELContext,Object)}, {@link #isReadOnly(ELContext)} and{@link #getType(ELContext)} methods will evaluate the expression each time they are called. The{@link ELResolver} in the ELContext is used to resolve the top-level variables and to determinethe behavior of the . and [] operators. For any of the four methods, the {@link ELResolver#getValue(ELContext,Object,Object)} method is used to resolve all propertiesup to but excluding the last one. This provides the base object. At the last resolution, the ValueExpression will call the corresponding {@link ELResolver#getValue(ELContext,Object,Object)}, {@link ELResolver#setValue(ELContext,Object,Object,Object)}, {@link ELResolver#isReadOnly(ELContext,Object,Object)} or{@link ELResolver#getType(ELContext,Object,Object)} method, depending on which was called onthe ValueExpression. See the notes about comparison, serialization and immutability in the {@link Expression} javadocs. @see ELResolver @see Expression @see ExpressionFactory

    String src = null;
    Object value = image.getValue();


    //Create url for dynamic or static image
    if(value instanceof StreamedContent) {
      ValueExpression valueVE = image.getValueExpression("value");
      String veString = valueVE.getExpressionString();
      String expressionParamValue = veString.substring(2, veString.length() - 1);
      
      StringBuilder builder = new StringBuilder(getActionURL(facesContext));
      builder.append("?").append(DynamicContentStreamer.DYNAMIC_CONTENT_PARAM).append("=").append(expressionParamValue);

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        this.getAttributes().put("javax.faces.component.UIComponentBase.attributesThatAreSet", setAttributes);
      }
    }
    if(setAttributes != null) {
      if(value == null) {
        ValueExpression ve = getValueExpression(name);
        if(ve == null) {
          setAttributes.remove(name);
        } else if(!setAttributes.contains(name)) {
          setAttributes.add(name);
        }

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        this.getAttributes().put("javax.faces.component.UIComponentBase.attributesThatAreSet", setAttributes);
      }
    }
    if(setAttributes != null) {
      if(value == null) {
        ValueExpression ve = getValueExpression(name);
        if(ve == null) {
          setAttributes.remove(name);
        } else if(!setAttributes.contains(name)) {
          setAttributes.add(name);
        }

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        this.getAttributes().put("javax.faces.component.UIComponentBase.attributesThatAreSet", setAttributes);
      }
    }
    if(setAttributes != null) {
      if(value == null) {
        ValueExpression ve = getValueExpression(name);
        if(ve == null) {
          setAttributes.remove(name);
        } else if(!setAttributes.contains(name)) {
          setAttributes.add(name);
        }

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        this.getAttributes().put("javax.faces.component.UIComponentBase.attributesThatAreSet", setAttributes);
      }
    }
    if(setAttributes != null) {
      if(value == null) {
        ValueExpression ve = getValueExpression(name);
        if(ve == null) {
          setAttributes.remove(name);
        } else if(!setAttributes.contains(name)) {
          setAttributes.add(name);
        }

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        this.getAttributes().put("javax.faces.component.UIComponentBase.attributesThatAreSet", setAttributes);
      }
    }
    if(setAttributes != null) {
      if(value == null) {
        ValueExpression ve = getValueExpression(name);
        if(ve == null) {
          setAttributes.remove(name);
        } else if(!setAttributes.contains(name)) {
          setAttributes.add(name);
        }

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        this.getAttributes().put("javax.faces.component.UIComponentBase.attributesThatAreSet", setAttributes);
      }
    }
    if(setAttributes != null) {
      if(value == null) {
        ValueExpression ve = getValueExpression(name);
        if(ve == null) {
          setAttributes.remove(name);
        } else if(!setAttributes.contains(name)) {
          setAttributes.add(name);
        }

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        this.getAttributes().put("javax.faces.component.UIComponentBase.attributesThatAreSet", setAttributes);
      }
    }
    if(setAttributes != null) {
      if(value == null) {
        ValueExpression ve = getValueExpression(name);
        if(ve == null) {
          setAttributes.remove(name);
        } else if(!setAttributes.contains(name)) {
          setAttributes.add(name);
        }

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        this.getAttributes().put("javax.faces.component.UIComponentBase.attributesThatAreSet", setAttributes);
      }
    }
    if(setAttributes != null) {
      if(value == null) {
        ValueExpression ve = getValueExpression(name);
        if(ve == null) {
          setAttributes.remove(name);
        } else if(!setAttributes.contains(name)) {
          setAttributes.add(name);
        }

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        this.getAttributes().put("javax.faces.component.UIComponentBase.attributesThatAreSet", setAttributes);
      }
    }
    if(setAttributes != null) {
      if(value == null) {
        ValueExpression ve = getValueExpression(name);
        if(ve == null) {
          setAttributes.remove(name);
        } else if(!setAttributes.contains(name)) {
          setAttributes.add(name);
        }

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