Example usage for javax.el ValueExpression ValueExpression

Introduction

In this page you can find the example usage for javax.el ValueExpression ValueExpression.

Prototype

ValueExpression

Source Link

Usage

From source file:org.openfaces.component.table.AbstractTable.java

private ValueExpression itemSelectedExpressionForColumn(final BaseColumn column) {
    final Map<String, Object> requestMap = FacesContext.getCurrentInstance().getExternalContext()
            .getRequestMap();/*from   w w  w .ja v a  2 s  .c  o  m*/
    final String var = getVar();
    if (column instanceof SelectionColumn || column instanceof CheckboxColumn)
        return new ValueExpression() {
            public Object getValue(ELContext context) {
                boolean thisRowSelected = isRowInColumnSelected(column, requestMap, var);
                return !thisRowSelected;
            }

            public void setValue(ELContext context, Object value) {
                throw new UnsupportedOperationException();
            }

            public boolean isReadOnly(ELContext context) {
                return true;
            }

            public Class getType(ELContext context) {
                return Boolean.class;
            }

            public Class getExpectedType() {
                return Boolean.class;
            }

            public String getExpressionString() {
                return null;
            }

            public boolean equals(Object o) {
                return false;
            }

            public int hashCode() {
                return 0;
            }

            public boolean isLiteralText() {
                return false;
            }
        };
    else
        throw new IllegalArgumentException("Unknown column type: " + column.getClass().getName());
}

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