@Override
    public final String toString() {
        if (toString == null) {
            toString = accept(ToStringVisitor.DEFAULT, Templates.DEFAULT);
        }
        return toString;
    }
{@code ExpressionBase} is the base class for immutable {@link Expression} implementations

@author tiwe

@param <T> expression type
querydsl-core/src/main/java/com/querydsl/core/types/ExpressionBase.java